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1
Ahmad, Husain Abdulrahman. "Dynamic Braking Control for Accurate Train Braking Distance Estimation under Different Operating Conditions." Diss., Virginia Tech, 2013. http://hdl.handle.net/10919/19322.
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The application of Model Reference Adaptive Control (MRAC) for train dynamic braking is investigated in order to control dynamic braking forces while remaining within the allowable adhesion and coupler forces. This control method can accurately determine the train braking distance. One of the critical factors in Positive Train Control (PTC) is accurately estimating train braking distance under different operating conditions. Accurate estimation of the braking distance will allow trains to be spaced closer together, with reasonable confidence that they will stop without causing a collision. This study develops a dynamic model of a train consist based on a multibody formulation of railcars, trucks (bogies), and suspensions. The study includes the derivation of the mathematical model and the results of a numerical study in Matlab. A three-railcar model is used for performing a parametric study to evaluate how various elements will affect the train stopping distance from an initial speed. Parameters that can be varied in the model include initial train speed, railcar weight, wheel-rail interface condition, and dynamic braking force. Other parameters included in the model are aerodynamic drag forces and air brake forces. An MRAC system is developed to control the amount of current through traction motors under various wheel/rail adhesion conditions while braking. Minimizing the braking distance of a train requires the dynamic braking forces to be maximized within the available wheel/rail adhesion. Excessively large dynamic braking can cause wheel lockup that can damage the wheels and rail. Excessive braking forces can also cause large buff loads at the couplers. For DC traction motors, an MRAC system is used to control the current supplied to the traction motors. This motor current is directly proportional to the dynamic braking force. In addition, the MRAC system is also used to control the train speed by controlling the synchronous speed of the AC traction motors. The goal of both control systems for DC and AC traction motors is to apply maximum available dynamic braking while avoiding wheel lockup and high coupler forces. The results of the study indicate that the MRAC system significantly improves braking distance while maintaining better wheel/rail adhesion and coupler dynamics during braking. Furthermore, according to this study, the braking distance can be accurately estimated when MRAC is used. The robustness of the MRAC system with respect to different parameters is investigated, and the results show an acceptable robust response behavior.
Ph. D.
2
He, Junjie. "Integrated vehicle dynamics control using active steering, driveline and braking." Thesis, University of Leeds, 2005. http://etheses.whiterose.ac.uk/979/.
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This thesis investigates the principle of integrated vehicle dynamics control through proposing a new control configuration to coordinate active steering subsystems and dynamic stability control (DSC) subsystems. The active steering subsystems include Active Front Steering (AFS) and Active Rear Steering (ARS); the dynamic stability control subsystems include driveline based, brake based and driveline plus brake based DSC subsystems. A nonlinear vehicle handling model is developed for this study, incorporating the load transfer effects and nonlinear tyre characteristics. This model consists of 8 degrees of freedom that include longitudinal, lateral and yaw motions of the vehicle and body roll motion relative to the chassis about the roll axis as well as the rotational dynamics of four wheels. The lateral vehicle dynamics are analysed for the entire handling region and two distinct control objectives are defined, i.e. steerability and stability which correspond to yaw rate tracking and sideslip motion bounding, respectively. Active steering subsystem controllers and dynamic stability subsystem controller are designed by using the Sliding Mode Control (SMC) technique and phase-plane method, respectively. The former is used as the steerability controller to track the reference yaw rate and the latter serves as the stability controller to bound the sideslip motion of the vehicle. Both stand-alone controllers are evaluated over a range of different handling regimes. The stand-alone steerability controllers are found to be very effective in improving vehicle steering response up to the handling limit and the stand-alone stability controller is found to be capable of performing the task of maintaining vehicle stability at the operating points where the active steering subsystems cannot. Based on the two independently developed stand-alone controllers, a novel rule based integration scheme for AFS and driveline plus brake based DSC is proposed to optimise the overall vehicle performance by minimising interactions between the two subsystems and extending functionalities of individual subsystems. The proposed integrated control system is assessed by comparing it to corresponding combined control. Through the simulation work conducted under critical driving conditions, the proposed integrated control system is found to lead to a trade-off between stability and limit steerability, improved vehicle stability and reduced influence on the longitudinal vehicle dynamics.
3
Deng, Jiantao. "Adaptation of A TruckSim Model to Experimental Heavy Truck Hard Braking Data." The Ohio State University, 2009. http://rave.ohiolink.edu/etdc/view?acc_num=osu1259633762.
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Handoko, Yunendar Aryo, and yunendar@inka web id. "INVESTIGATION OF THE DYNAMICS OF RAILWAY BOGIES SUBJECTED TO TRACTION / BRAKING TORQUE." Central Queensland University. Centre for Railway Engineering, 2006. http://library-resources.cqu.edu.au./thesis/adt-QCQU/public/adt-QCQU20070209.101959.
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The limitations of current simulation packages in addressing the true longitudinal behaviour of railway bogie dynamics during braking/traction has prompted the development of a Rail Bogie Dynamics (RBD) program in this thesis. The RBD program offers novel features for the calculation of the speed profile as a function of the brake torque as well as explicitly determining wheelset angular velocity. With such capability, the speed profile is no longer treated as an input calculated as a priori as required by most of the current simulation systems. The RBD program has been developed using a formulation that includes the wheelset pitch degree of freedom explicitly with a coordinate reference system that is fixed in space and time. The formulation has made the simulation of the bogie dynamics during braking/traction possible in a natural way using the brake/traction torque as the input and the resulting speed profile as the output without any need for working out the speed profile as a priori. Consequently, severe dynamics during braking such as the wheelset skid and the onset of wheel climb derailment can be modelled and critical parameters investigated using the RBD program. The RBD program has been validated, where possible, through a series of simulations using a commercial software package (VAMPIRE). For cases which cannot be simulated by VAMPIRE such as the wheelset skid, a novel experimental program has been designed and commissioned in the Heavy Testing Laboratory of the Central Queensland University as reported in this thesis. One of the possible applications of the RBD program in examining the effect of asymmetric brake shoe force in bogies equipped with one-side push brake shoe arrangement is illustrated in this thesis. It is believed that the model and RBD program will have significant benefit in understanding the true longitudinal behaviour of wagons in suburban passenger trains that operate under braking/ traction torques for most of their travel. Similar studies will also be useful to freight train wagon dynamics during entry and exit of speed restriction zones and tight curves.
5
Jaiswal, Manish. "The interaction of tyre and anti-lock braking in vehicle transient dynamics." Thesis, Loughborough University, 2009. https://dspace.lboro.ac.uk/2134/15201.
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The thesis presents an intermediate modelling approach to study transient behaviour of vehicle systems, with emphasis put on simplified yet accurate representation of important system elements. A representative non-linear vehicle model is developed in MA TLAB/Simulink environment, where non-linear characteristics of tyre, suspension and braking system are included to capture the dynamic behaviour of a vehicle under transient conditions. The novel aspect of this work is the application of a representative full vehicle-tyre-ABS integrated set-up to study the complicated interaction between tyre and anti-lock braking, under a range of demanding operating conditions, including combined cornering and braking. The modelling methodology involves development of low end vehicle models, based on the Newton-Euler formulation. Subsequently, an intermediate vehicle model is devised, where more details are incorporated such as additional DOF to capture the sprung mass motion in space, along with its non-linear interactions with the un-sprung masses, large angle effects, kinematics of steering/wheels and an appropriate tyre model suitable for transient manoeuvres. Particular attention is paid to the suspension system modelling, through inclusion of non-linear effects in springs, dampers, bump-stops, and anti-roll bars, along with the jacking and anti-dive effects using the virtual work method. The model also incorporates a hydraulic brake model, based on the reduced order brake system dynamics for realistic simulation of the braking manoeuvres. A complex multi-body ADAMS/Chassis model, with much greater level of detail, has also been established to extensively compare and enhance the realistic behaviour of the intermediate vehicle model. During the simulation exercise, the intermediate vehicle model has shown good agreement with the complex ADAMS model, thus justifying the accurate representation of vehicle.non-linear characteristics, particularly the suspension system. The realistic behaviour of the vehicle model is further ascertained with a reliable GPS enabled test vehicle, by performing number of manoeuvres on test tracks, including combined cornering and braking. A representative 4-channel conventional ABS system is modelled and integrated in the intermediate vehicle model. The ABS adopts generic peak seeking approach, employing wheel deceleration and brake slip as control variables. External braking inputs, in form of stepped pressure pulses, are also separately used to represent the transient braking system dynamics. In the current work, different transient tyre models based on the single point contact approach and using Magic Formula steady-state characteristics are applied, while studying the influence of their dynamic behaviour on the ABS system. By employing a representative ABS system in a multi-body vehicle model and considering the particularly demanding situation of combined braking I cornering, it is shown that the models which are adequate for pure braking might struggle when the complicated full vehicle dynamics are excited. It is shown that the first order relaxation length approach may not be sufficient to fully satisfy the requirements of an ABS braking, especially if the relaxation length is not modelled as a variable dependent on tyre slip. In comparison, the modelling approach, where the carcass compliances and contact patch properties are explicitly represented, can handle the oscillatory tyre behaviour associated with ABS braking, in a far more accurate manner. In comparison to the earlier studies, which were mostly conducted for straight-line braking, this thesis stresses the fact that the tyre behaviour can be influenced by the complex interaction of handling and braking, and hence the effect should be captured while investigating or evaluating the performance of a tyre model in relation with ABS simulation.
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Hossein, Nia Saeed. "An Investigation of the Iron-Ore Wheel Damages using Vehicle Dynamics Simulation." Licentiate thesis, KTH, Spårfordon, 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-159733.
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Maintenance cost is one of the important issues in railway heavy haul operations. For the iron-ore company LKAB, these costs are mainly associated with the reprofiling and changing of the wheels of the locomotives and wagons. The main reason for the wheel damages is usually surface initiated rolling contact fatigue (RCF) on the wheels.The present work tries to enhance and improve the knowledge of the vehicle-track interaction of the Swedish iron-ore freight wagons and locomotives used at Malmbanan. The study is divided into two parts. Firstly, it is tried to get into the roots of RCF using the simulation model of the iron ore wagon (Paper A). Secondly, the study is focused on predicting wear and RCF on the locomotive wheels also via a dynamic simulation model (Paper B).In the first paper, some key issues of the dynamic modelling of the wagons with three piece bogies are first discussed and then parameter studies are carried out to find the most important reasons of wheel damages. These parameter studies include track design geometry, track irregularities, wheel-rail friction level, cant deficiency and track stiffness. The results show a significant effect of the friction level on the amount of RCF risk.As the locomotive wheel life is much shorter than that of the wagons, LKAB has decided to change the locomotive wheel profile. Two final wheel profiles are proposed; however, one had to be approved for the field tests. In the second paper, the long term evolution of the two profiles is compared via wear simulation analysis. Also, the RCF evolution on the wheel profiles as a function of running distance is discussed. The process is first carried out for the current locomotive wheel profiles and the results are compared with the measurements. Good agreement is achieved. Finally, one of the proposed profiles is suggested for the field test because of the mild wear and RCF propagation.QC 20150210
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Siramdasu, Yaswanth. "Discrete Tire Model Application for Vehicle Dynamics Performance Enhancement." Diss., Virginia Tech, 2015. http://hdl.handle.net/10919/74394.
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Tires are the most influential component of the vehicle as they constitute the only contact
between the vehicle and the road and have to generate and transmit forces necessary for
the driver to control the vehicle. The demand for the tire models are increasing due to
the need to study the variations of force generation mechanisms due to various variables
such as load, pressure, speed, and road surface irregularities. Another need from the vehicle
manufactures is the study of potential incompatibilities associated with safety systems such
as Anti-lock Braking System (ABS) and Electronic Stability Control (ESC) and tires. For
vehicle dynamic simulations pertaining to the design of safety systems such as ABS, ESC
and ride controllers, an accurate and computationally efficient tire model is required. As
these control algorithms become more advanced, they require accurate and extended validity
in the range of frequencies required to cover dynamic response due to short wavelength road
disturbances, braking and steering torque variations. Major thrust has been provided by the
tire industry to develop simulation models that accurately predict the dynamic response of
tires without the use of computationally intensive tools such as FEA.
The objectives of this research are
• To develop, implement and validate a rigid ring tire model and a simulation tool
to assist both tire designers and the automotive industry in analyzing the effects of
tire belt vibrations, road disturbances, and high frequency brake and steering torque
variations on the handling, braking, and ride performances of the vehicle.
• To further enhance the tire model by considering dynamic stiffness changes and temperature dependent friction properties.
• To develop, and implement novel control algorithms for braking, stability, and ride
performance improvements of the vehiclePh. D.
8
Hossein, Nia Saeed. "On Heavy-Haul Wheel Damages using Vehicle Dynamics Simulation." Doctoral thesis, KTH, Spårfordon, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-220344.
Full textAbstract:
Maintenance cost is one of the important issues in railway heavy-haul operations. In most of the cases, these costs are majorly referring to reprofiling and changing the wheels of the locomotives and the wagons. The main reason of the wheel damages is usually severe wear and/or surface initiated rolling contact fatigue (RCF).This work tries to enhance and improve the knowledge of the wheel wear and RCF prediction models using dynamic simulations. While most of the contents of this study can be generalised to other operational networks, this study is focused on the locomotives and wagons of the Swedish iron-ore company LKAB. The trains are operating on the approximately 500 km long IORE line from Luleå to Narvik in the north of Sweden and Norway respectively.Firstly, a literature survey of dynamic modelling of the wagons with various three-piece bogie types is presented. Then, with concentrating on the standard three-piece bogies, parameter studies are carried out to find out what the most important reasons of wheel damages are. Moreover, the long-term stability of wheel profiles of the IORE wagons is analysed. This is done by visualising the wear and RCF evolution on the wheel profiles over 150,000km of simulated running distance.Most of the calculations for the wagons are repeated for the locomotives. However, traction and braking are also considered in the simulation model and their effects on wheel damages are briefly studied. To improve the accuracy of the wheel damage analysis, a newly developed algorithm called FaStrip is used to solve the tangential contact problem instead of FASTSIM. The damage prediction model developed in the thesis is used to study the effects of increasing axle load, correcting the track gauge, limiting the electro-dynamic braking and using a harder wheel material on the wheel life. Furthermore, a new method is developed to predict the running distance between two consecutive reprofilings due to severe surface initiated fatigue. The method is based on shakedown analysis and laboratory tests.Most of the research works in wear calculation are limited to two approaches known as wear number and Archard methods. The correlation between these two methods is studied. The possibility of using the relation between the two methods for the wear calculation process is investigated mainly to reduce the calculation time for wheel profile optimisation models.QC 20171219
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Dahlberg, Erik. "Commercial Vehicle Stability - Focusing on Rollover." Doctoral thesis, Stockholm, 2001. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-3143.
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Chandrasekharan, Santhosh. "Development of a tractor-semitrailer roll stability control model." The Ohio State University, 2007. http://rave.ohiolink.edu/etdc/view?acc_num=osu1196260360.
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Sengupta, Abhinav, and Alexey Gurov. "Evaluating the effectiveness of collisionavoidance functions using state-of-the-artsimulation tools for vehicle dynamics." Thesis, KTH, Fordonsdynamik, 2013. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-159262.
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The main goal of this work is to gain knowledge of how and to what extent state-of-the-artsimulation tools can be used in a conceptual development phase for vehicle dynamics control atVolvo Car Corporation (VCC).The first part of the thesis deals with an evaluation of vehicle dynamics simulation tools and theiruses. The three simulation tools selected for the study, namely Mechanical Simulation CarSim 8.2.1,IPG CarMaker 4.0.5, and VI-Grade CarRealTime V14, are briefly described and discussed. In order toevaluate and compare these tools with respect to application for vehicle dynamics control, a criterialist is developed covering aspects such as tool requirements and intended usage. Based on thecriteria list and certain identified drawbacks, a ranking of the tools is made possible. Furthermore,the process of developing vehicle models for the different tools is discussed in detail, along with theprocedure of validating the vehicle models.In the second part, the concept of Collision Avoidance Driver Assistance (CADA) function isintroduced and possible approaches for developing CADA functions are discussed in brief. It isimportant to note that the CADA functions in this work are based on cornering the vehicle i.e.maneuvering around the threat, rather than solely reducing vehicle speed. A number ofimplementations of the functions are developed in Simulink. A frequency analysis of a simplifiedlinear vehicle model is performed to investigate the influence of steering, differential braking, andtheir combination on the resultant lateral displacement of the vehicle during an evasive maneuver.The developed CADA functions are then simulated using the vehicle simulation tools. Two specificmetrics - Lateral Displacement gain and DeltaX - are formulated to evaluate the effectiveness of theCADA functions. Based on these metrics, the assistance obtained due to the functions for a specificevasive maneuver is compared.From the evaluation process of the three tools, two were considered suitable for the purpose ofsimulating collision avoidance functions. The evaluation of the CADA functions demonstrates thatcombined assistive steering with differential braking provides considerable assistance in order toavoid collisions. The simulation results also present interesting trends which provide a usefuldirection regarding the conditions for intervention by such collision avoidance functions during anevasive maneuver. The use of simulation tools makes it possible to observe these trends and utilizethem in the development process of the functions.
12
Kopca, Filip. "Vliv parametrů odpružení a tlumení na jízdní vlastnosti vozidla." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2017. http://www.nusl.cz/ntk/nusl-318519.
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The thesis describes function and characteristics of spring and damper, their particular way and margin of influence on vehicle behavior in selected riding maneuvers. The goal is to maintaining maximal grip, control, and achieve predictable vehicle handling.
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Kim, Andrew Eundong. "Experimental Evaluation of the Dynamic Performance Benefits of Roll Stability Control Systems on A-train Doubles." Thesis, Virginia Tech, 2018. http://hdl.handle.net/10919/102377.
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The ride stability of an A-train 28-foot double tractor trailer when outfitted with different Roll Stability Control (RSC) systems with the same payload and suspension configurations is studied experimentally for various dynamic maneuvers. The primary goal of the study is to determine the effect of different commercially-available RSC systems on the extent of improvements they offer for increasing roll stability of commercial vehicles with double trailers, when subjected to limit-steering maneuvers that can rise during highway driving. A semitruck and two 28-foot trailers are modified for enduring the forces and moments that can result during testing. A load structure is used for placing the ballast loads within the trailers at a suitable height for duplicating the CG height of the trailers during their commercial use. Outriggers and jackknifing arresting mechanisms are used to prevent vehicle damage and ensure safety during the tests. The test vehicle is equipped with multiple sensors and cameras for the necessary measurements and observations. The analog and video data are time-synced for correlating the measurements with visual observation of the test vehicle dynamics in post-processing.
An extensive number of tests are conducted at the Michelin Laurens Proving Grounds (MLPG) in Laurens, SC. The tests include evaluating each RSC system with different maneuvers and speeds until a rollover occurs or the vehicle is deemed to be unstable. The maneuvers that are used for the tests include: double lane change, sine-with-dwell, J-turn, and ramp steer maneuver. Both a steering robot and subjective driver are used for the tests. The test data are analyzed and the results are used to compare the three RSC systems with each other, and with trailers without RSC. The test results indicate that all three RSC systems are able to improve the speed at which rollover occurs, with a varying degree. For two of the systems, the rollover speed gained, when compared with trailers without RSC, is marginal. For one of the systems, there are more significant speed gains. Since most RSC systems are tuned for a conventional tractor-trailer, additional testing with some of the systems would be necessary to enable the manufacturers to better fine-tune the RSC control scheme to the dynamics of double trailers.MS
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Renza, Jaroslav. "Jízdní dynamika traktoru." Master's thesis, Vysoké učení technické v Brně. Ústav soudního inženýrství, 2016. http://www.nusl.cz/ntk/nusl-241322.
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This thesis analyses driving dynamics of tractors and its dependence on their weight and age. In the beginning, brief history of tractor development and definition of basic concept of the tractor analysis is described. The thesis states procedures for obtaining magnitudes necessary for determining of driving dynamics. Experimental part describes the realized measurement on chosen sample of tractors and interprets measured values. Last part of the thesis contains evaluation of the measurement results.
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Yu, Zitian. "Integrated Estimation and Motion Control for Electric Vehicles." The Ohio State University, 2018. http://rave.ohiolink.edu/etdc/view?acc_num=osu1531778655719369.
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Бондаренко, Анатолій Ігорович. "Наукове обґрунтування нових технічних рішень процесу гальмування колісних тракторів з безступінчастими гідрооб'ємно-механічними трансмісіями." Thesis, НТУ "ХПІ", 2016. http://repository.kpi.kharkov.ua/handle/KhPI-Press/21355.
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Дисертація на здобуття наукового ступеня доктора технічних наук за спеціальністю 05.22.02 – автомобілі та трактори. – Національний технічний університет "Харківський політехнічний інститут", Харків, 2016.
Дисертація присвячена вирішенню актуальної науково-практичної проблеми щодо підвищення технічного рівня, а також керованості та гальмівної ефективності колісних тракторів з гідрооб’ємно-механічними трансмісіями за рахунок наукового обґрунтування нових технічних рішень процесу гальмування на основі системного підходу до визначення основних закономірностей робочих процесів у безступінчастих трансмісіях, а також встановлення раціональних способів реалізації процесу гальмування та законів зміни параметрів регулювання гідрооб’ємної передачі. В роботі наведено методологію визначення раціональної структури та конструктивних параметрів гідрооб’ємно-механічних трансмісій для колісних тракторів, яка базується на орієнтуванні не тільки на кінематичні, силові та енергетичні параметри трансмісії при виконанні трактором технологічної операції "оранка", а й враховує особливості гальмування різноманітними способами та кількісні показники ергономічності трактора.Thesis for a Doctor Degree in Technical Sciences: speciality 05.22.02 – Automobiles and Tractors. – National Technical University "Kharkіv polytechnic institute", Kharkiv, 2016. This thesis deals with the actual scientific problem which intersect with increasing of competitiveness, and also dirigibility and brake efficiency of the wheeled tractors with hydrostatic-mechanical transmissions at the expense of scientific grounding of innovative technology of braking process on the base of systems approach to determination of basic conformities to the law of working processes in such transmissions, and also choice of rational method of realization of process of braking and character of change of parameters of adjusting of hydrostatic-mechanical transmission at braking. The method of determination of rational structure and parameters of hydrostatic-mechanical transmission is developed in work for the wheeled tractors, which is based on the orientation not only on the kinematics, forces and power parameters of hydrostatic-mechanical transmission of the tractor for technological operation "ploughing" but also on the feature of change of kinematics and power parameters of transmission at braking of tractor by the varied methods, in addition considers the quantitative indexes of ergonomics tractor.
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Tamáši, Adam. "Specifika dopravních nehod zemědělské techniky." Master's thesis, Vysoké učení technické v Brně. Ústav soudního inženýrství, 2018. http://www.nusl.cz/ntk/nusl-382229.
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Master’s thesis focuses on the specifics of agricultural machinery accidents. The introductory part defines agricultural machines and its basic characteristics. It also analyzes specific technical regulations that govern the use of these machines in traffic. The experimental part then describes the methodology and interprets the results of conducted experimental measurements on driving dynamics of a tractor with carried accessory. These measurements consist of a break test in straight line, evasion manoeuvre and acceleration while turning left. The focus was given to not just the acceleration values, but also to the influence of the carried accessory, the load on the front axle or the tire pressure. The analysis of the findings made compares the results with the driving dynamics of ordinary passenger cars and provides a detail dissection of the most frequent causes of agricultural machinery accidents.
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Rao, Shreesha Yogish. "Development of a Heavy Truck Vehicle Dynamics Model using Trucksim and Model Based Design of ABS and ESC Controllers in Simulink." The Ohio State University, 2013. http://rave.ohiolink.edu/etdc/view?acc_num=osu1364407532.
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Zermegh, Tomáš. "Zvyšování tepelných, elektrických a mechanických vlastnosti bezpečnostních brzd." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2016. http://www.nusl.cz/ntk/nusl-254463.
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This thesis is dealing with a detailed analysis of electromechanical brake used in emergency situations to stop the electric motor. Environmental influences, bad material proposal or bad design parameters can significantly limit the behaviour of a brake. The thesis presents several approaches to avoid these limitations, to limit the reaction time and achieve better results. The attached programs can be used either for innovation, or for the new brake design based on the entry requirements.
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Бондаренко, Анатолій Ігорович. "Наукове обґрунтування нових технічних рішень процесу гальмування колісних тракторів з безступінчастими гідрооб'ємно-механічними трансмісіями." Thesis, НТУ "ХПІ", 2016. http://repository.kpi.kharkov.ua/handle/KhPI-Press/21354.
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Дисертація на здобуття наукового ступеня доктора технічних наук за спеціальністю 05.22.02 – автомобілі та трактори. – Національний технічний університет "Харківський політехнічний інститут", Харків, 2016.
Дисертація присвячена вирішенню актуальної науково-практичної проблеми щодо підвищення технічного рівня, а також керованості та гальмівної ефективності колісних тракторів з гідрооб’ємно-механічними трансмісіями за рахунок наукового обґрунтування нових технічних рішень процесу гальмування на основі системного підходу до визначення основних закономірностей робочих процесів у безступінчастих трансмісіях, а також встановлення раціональних способів реалізації процесу гальмування та законів зміни параметрів регулювання гідрооб’ємної передачі. В роботі наведено методологію визначення раціональної структури та конструктивних параметрів гідрооб’ємно-механічних трансмісій для колісних тракторів, яка базується на орієнтуванні не тільки на кінематичні, силові та енергетичні параметри трансмісії при виконанні трактором технологічної операції "оранка", а й враховує особливості гальмування різноманітними способами та кількісні показники ергономічності трактора.Thesis for a Doctor Degree in Technical Sciences: speciality 05.22.02 – Automobiles and Tractors. – National Technical University "Kharkіv polytechnic institute", Kharkiv, 2016. This thesis deals with the actual scientific problem which intersect with increasing of competitiveness, and also dirigibility and brake efficiency of the wheeled tractors with hydrostatic-mechanical transmissions at the expense of scientific grounding of innovative technology of braking process on the base of systems approach to determination of basic conformities to the law of working processes in such transmissions, and also choice of rational method of realization of process of braking and character of change of parameters of adjusting of hydrostatic-mechanical transmission at braking. The method of determination of rational structure and parameters of hydrostatic-mechanical transmission is developed in work for the wheeled tractors, which is based on the orientation not only on the kinematics, forces and power parameters of hydrostatic-mechanical transmission of the tractor for technological operation "ploughing" but also on the feature of change of kinematics and power parameters of transmission at braking of tractor by the varied methods, in addition considers the quantitative indexes of ergonomics tractor.
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Octau, Charlène. "Contribution à l’étude de la génération et de la dynamique de particules émises lors du freinage : application au freinage ferroviaire." Thesis, Valenciennes, Université Polytechnique Hauts-de-France, 2019. http://www.theses.fr/2019UPHF0008.
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Ce travail porte sur une problématique pluridisciplinaire qui combine la caractérisation expérimentale des particules émises au cours du freinage d’un train et la modélisation numérique du transport de ces dernières dans le but de prédire leur comportement dynamique suite à leur génération. Ces particules peuvent présenter un réel risque sanitaire pour les usagers qui empruntent chaque jour les transports en communs, de par leur taille submicronique et leur composition. Il est important d’identifier leurs caractéristiques physiques propres (distribution en taille, forme, composition, etc.) mais également dynamiques (vitesse d’éjection, trajectoire préférentielle, concentration, etc.) afin d’évaluer ce dont les usagers peuvent être exposés et éventuellement s’en prémunir. Pour ce faire, un banc d’essai de freinage a été mis au point pour générer des particules dans des conditions représentatives d’un parcours type d’un train et sous des sollicitations particulières de freinage. Les caractéristiques des particules obtenues suite à des analyses, semblent montrer une influence des conditions de sollicitation de freinage sur les caractéristiques des particules émises. Ces différentes données sont essentielles pour pouvoir prédire le comportement dynamique des particules, et servent de données d’entrée pour l’implémentation de modèles numériques simulant le transport des particules dans l’airThis work focuses on a multidisciplinary problem that combines the experimental characterization of particles emitted during train braking and the numerical modeling of their transport in order to predict their dynamic behavior following their generation. These particles can present a real health risk for users who commute by public transport every day, due to their submicronic size and composition. It is important to identify their specific physical characteristics (size distribution, shape, composition, etc.) but also their dynamics (ejection speed, preferential trajectory, concentration, etc.) in order to know what users can be exposed to and possibly protect themselves from. To this end, a brake test bench has been developed to generate particles under conditions representative of a typical train route and under particular braking conditions. The characteristics of the particles obtained following analysis seem to show an influence of the braking stress conditions on the characteristics of the emitted particles. These different data are essential to predict the dynamic behavior of particles, and provide input data for the implementation of numerical models simulating particle transport in the air
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Allaith, Noori A. "Intelligent power module for variable speed AC motor drives." Thesis, University of Bristol, 1997. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.361134.
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Causebrook, Andrew. "Fault ride-through of wind farms using series dynamic braking resistors." Thesis, University of Newcastle Upon Tyne, 2008. http://hdl.handle.net/10443/513.
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Wind power is one of the world's fastest growing industries. The resulting penetration of wind power has led to substantial changes in requirements for large wind farms. Fault Ride-Through (FRT) was an important new requirement for wind farms to remain connected and actively contribute to system stability during a wide range of network faults. The wind industry responded with several approaches to FRT compliance including dynamic Reactive Power Compensation (dRPC) and pitch control. New requirements, combined with the reduced cost and increased efficiency of power electronic converters has led to the increasing dominance of Variable Speed Wind Turbines (VSWTs). Recent research has therefore focused on VSWTs. This Thesis presents a new technology, invented and developed during my PhD project, which provides a rearguard opportunity for Fixed Speed Wind Turbines (FSWTs) to comply with FRT requirementsu sing a series Dynamic Braking Resistor (sDBR). sDBR contributes directly to the balance of active power during a fault by inserting a series resistor into the generation circuit, increasing generator terminal voltage. The aim of the analysis, simulation and experimental work in this Thesis is to demonstrate the potential and scope of sDBR to contribute to FRT compliance of FSWTs. sDBR is shown to be a simple and effective means of displacing expensive dRPC to achieve full compliance with Great Britain's FRT requirements. It is also shown to be capable of contributing to compliance with the more onerous FRT requirements in conjunction with other technologies. Detailed transient simulations of sDBR were confirmed by experimental results using a 7.5kW test-rig. Although the FSWT market is severely weakened, opportunities remain in niche markets for new and existing wind farms. Continued research into high-speed switching, variable resistance and integrated control could further improve basic sDBR performance. Further research into new applications with distribution networks,s mall wind turbines and doubly-fed induction generators could also extend its application in new markets with longer horizons.
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Khaitan, Pradhyumn. "Dynamic safety zone-based path planning for reduction of unwanted emergency braking." Thesis, KTH, Mekatronik, 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-273257.
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Autonomous vehicles are required to have higher standards of safety. To enforce this , different subsystems in the autonomous vehicle are categorised to different safety levels by the industry. The problem arises when these subsystems are required to interact with each other. The objective of this thesis is to build and study the interaction between two systems in an autonomous vehicle. The two systems here are the path planning and the emergency braking system (AEBS) which are assigned different safety levels. Model Predictive Control(MPC) is used to build the interaction between the path planning and the emergency braking system. The zone of activation of the emergency braking system is modelled as polygon and is called the safety zone for the autonomous vehicle. The shape of this polygon is a function of a decision variable of the MPC. With respect to the safety zone, Farkas’s lemma is used to further constrain the vehicle to stay within the boundary of the road and avoid static obstacles.Two scenarios are built and studied to see the implications of the interactions of these two different systems. To study this interaction, the simulations are carried out with and without the interaction of the safety zone with the path planning system. This helps us in visualizing and understanding the factors influencing the size and shape of the safety zone. Key results of this thesis are to demonstrate the unwanted activation of the AEBS and the adaptive shape changing nature of the safety zone as a part of the MPC. These results demonstrate the importance of the safety zone being a part of the MPC, to prevent unwanted activation of the AEBS. The analysis contained in this thesis provides a methodology by which these two different standard systems(AEBS and path planner) can be integrated in an autonomous vehicle.Autonoma fordon måste ha högre säkerhetsstandarder. För att upprätthålla detta kategoriseras olika delsystem i det autonoma fordonet till olika säkerhetsnivåer av branschen. Problemet uppstår när dessa delsystem krävs för att interagera med varandra. Syftet med denna avhandling är att bygga och studera interaktionen mellan två system i ett autonomt fordon. De två systemen här är vägplanering och nödbromssystem (AEBS) som tilldelas olika säkerhetsnivåer. Model Predictive Control (MPC) används för att bygga interaktionen mellan vägplanering och nödbromssystem. Nödbromssystemets aktiveringszon är modellerad som polygon och kallas säkerhetszonen för det autonoma fordonet. Formen på denna polygon är en funktion av en beslutsvariabel för MPC. När det gäller säkerhetszonen används Farkas lemma för att ytterligare begränsa fordonet att stanna inom väggränsen och undvika statiska hinder.Två scenarier byggs och studeras för att se konsekvenserna av interaktioner mellan dessa två olika system. För att studera denna interaktion utförs simuleringarna med och utan interaktionen mellan säkerhetszonen och vägplaneringssystemet. Detta hjälper oss att visualisera och förstå de faktorer som påverkar säkerhetszonens storlek och form. Viktiga resultat av denna avhandling är att demonstrera den oönskade aktiveringen av AEBS och den anpassningsform som ändrar naturen hos säkerhetszonen som en del av MPC. Dessa resultat visar vikten av att säkerhetszonen är en del av MPC för att förhindra oönskad aktivering av AEBS. Analysen i denna avhandling tillhandahåller en metod genom vilken dessa två olika standardsystem (AEBS och sökplanerare) kan integreras i ett autonomt fordon.
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Šujan, Tomáš. "Analýza jízdy osobního vozidla s přívěsem." Master's thesis, Vysoké učení technické v Brně. Ústav soudního inženýrství, 2013. http://www.nusl.cz/ntk/nusl-232737.
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The subject of this thesis is the analysis of the negative effects associated with the operation of a trailer for a personal vehicle with respect to the design speed, technical checks and analysis related legislation. Its work is drawn from the measurement, cooperation with leading Czech production plant trailers Vezeko s.r.o., an organization engaged in the implementation of engineering controls DEKRA Automobil a.s. and available literature, including electronic resources. Results of the work end with proposals for specific measures to minimize the identified adverse effects.
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Kang, Xiaodi. "Optimal tank design and directional dynamic analysis of liquid cargo vehicles under steering and braking." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 2001. http://www.collectionscanada.ca/obj/s4/f2/dsk3/ftp04/NQ59231.pdf.
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Liette, Jared V. "Dynamic Characterization of the Rectangular Piston Seal in a Disc-Caliper Braking System Using Analytical and Experimental Methods." The Ohio State University, 2011. http://rave.ohiolink.edu/etdc/view?acc_num=osu1308177695.
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Drabison, John Stephen II. "Experimental Investigation of Judder in a Floating Disc-Caliper Braking System with Focus on Pad Geometry." The Ohio State University, 2010. http://rave.ohiolink.edu/etdc/view?acc_num=osu1276795212.
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Корж, А. Г. "Проєкт вантажного автомобіля КРАЗ 255 з модернізацією гальмівної системи." Thesis, Чернігів, 2021. http://ir.stu.cn.ua/123456789/23205.
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Корж, А. Г. Проєкт вантажного автомобіля КРАЗ 255 з модернізацією гальмівної системи : випускна кваліфікаційна робота : 274 «Автомобільний транспорт» / А. Г. Корж ; керівник роботи В. І. Венжега ; НУ "Чернігівська політехніка", кафедра автомобільного транспорту та галузевого машинобудування. – Чернігів, 2021. – 82 с.Проведено аналітичний огляд вантажних автомобілів схожої компонувальної схеми та вантажопідйомності. Проведено визначення масових показників та параметрів автомобіля та його двигуна. Проведено розрахунок зовнішньої швидкісної характеристики двигуна, силового балансу автомобіля та визначення параметрів трансмісії. Проведено розрахунок показників динамічності автомобіля при рівномірному та не рівномірному русі, метод силового балансу та динамічної характеристики. Проведено розрахунок паливної економічності та гальмівних властивостей автомобіля Розглянуто види гальмівних систем автомобіля, виконано розрахунок та модернізацію гальмівної системи автомобіля. При виконанні кваліфікаційної роботи бакалавра розрахунки та креслення виконували в таких програмах, як: “Компас” та “Mathcad”.
An analytical inspection of trucks with a similar layout and load capacity was conducted. The mass indicators and parameters of the car and its engine were determined. The calculation of the external speed characteristics of the engine, the power balance of the car and the definition of transmission parameters. The calculation of the dynamics of the car with uniform and non-uniform motion, the method of force balance and dynamic characteristics. The calculation of fuel economy and braking properties of the car is carried out The types of car brake systems are considered, the calculation and modernization of the car brake system are performed. During the bachelor's qualification work, calculations and drawings were performed in such programs as "Compass" and "Mathcad".
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McLaughlin, Shane Brendan. "Analytic Assessment of Collision Avoidance Systems and Driver Dynamic Performance in Rear-End Crashes and Near-Crashes." Diss., Virginia Tech, 2007. http://hdl.handle.net/10919/29561.
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Collision avoidance systems (CASs) are being developed and fielded to reduce the number and severity of rear-end crashes. Kinematic algorithms within CASs evaluate sensor input and apply assumptions describing human-response timing and deceleration to determine when an alert should be presented. This dissertation presents an analytic assessment of dynamic function and performance CASs and associated driver performance for preventing automotive rear-end crashes. A method for using naturalistic data in the evaluation of CAS algorithms is described and applied to three algorithms. Time-series parametric data collected during 13 rear-end crashes and 70 near-crashes are input into models of collision avoidance algorithms to determine when the alerts would have occurred. Algorithm performance is measured by estimating how much of the driving population would be able to respond in the time available between when an alert would occur and when braking was needed. A sensitivity analysis was performed to consider the effect of alternative inputs into the assessment method. The algorithms were found to warn in sufficient time to permit 50â 70% of the population to avoid collision in similar scenarios. However, the accuracy of this estimate was limited because the tested algorithms were found to alert too frequently to be feasible. The response of the assessment method was most sensitive to differences in assumed response-time distributions and assumed driver braking levels. Low-speed crashes were not addressed by two of the algorithms. Analysis of the events revealed that the necessary avoidance deceleration based on kinematics was generally less than 2 s in duration. At the time of driver response, the time remaining to avoid collision using a 0.5g average deceleration ranged from â 1.1 s to 2.1 s. In 10 of 13 crashes, no driver response deceleration was present. Mean deceleration for the 70 near-crashes was 0.37g and maximum was 0.72g. A set of the events was developed to measure driver response time. The mean driver response time was 0.7 s to begin braking and 1.1 s to reach maximum deceleration. Implications for collision countermeasures are considered, response-time results are compared to previous distributions and future work is discussed.Ph. D.
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Кульгейко, Д. М. "Проєкт легкового автомобіля Opel Commodore з розрахунком гальмівної системи." Thesis, Чернігів, 2021. http://ir.stu.cn.ua/123456789/23204.
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Кульгейко, Д. М. Проєкт легкового автомобіля Opel Commodore з розрахунком гальмівної системи : випускна кваліфікаційна робота : 274 «Автомобільний транспорт» / Д. М. Кульгейко ; керівник роботи В. І. Венжега ; НУ "Чернігівська політехніка", кафедра автомобільного транспорту та галузевого машинобудування. – Чернігів, 2021. – 78 с.Проведено аналітичний огляд легкових автомобілів одного класу й схожої компонувальної схеми автомобілів. Проведено визначення масових показників та параметрів автомобіля та його двигуна. Проведено розрахунок зовнішньої швидкісної характеристики двигуна, силового балансу автомобіля та визначення параметрів трансмісії. Проведено розрахунок показників динамічності автомобіля при рівномірному та не рівномірному русі, метод силового балансу та динамічної характеристики. Проведено розрахунок паливної економічності та гальмівних властивостей автомобіля Розглянули види гальмівних систем автомобіля, виконали розрахунок та модернізацію гальмівної системи автомобіля. При виконанні кваліфікаційної роботи бакалавра розрахунки та креслення виконували в таких програмах, як: “Компас” та “Mathcad”.
An analytical review of cars of the same class and a similar layout of cars. The determination of mass indicators and parameters of the car and its engine is carried out. The calculation of the external speed characteristics of the engine, the power balance of the car and the definition of transmission parameters. The calculation of the dynamics of the car with uniform and non-uniform motion, the method of force balance and dynamic characteristics. The calculation of fuel economy and braking properties of the car is carried out The types of car brake systems were considered, the calculation and modernization of the car brake system were performed. During the bachelor's qualification work, calculations and drawings were performed in such programs as "Compass" and "Mathcad".
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Every, Joshua Lee. "Development of a Driver Behavior Based Active Collision Avoidance System." The Ohio State University, 2015. http://rave.ohiolink.edu/etdc/view?acc_num=osu1429800895.
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Каптель, Д. В. "Проєкт легкового автомобіля Opel з розрахунком зчеплення та рульового керування /комплексний проєкт/." Thesis, Чернігів, 2021. http://ir.stu.cn.ua/123456789/23226.
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Каптель, Д. В. Проєкт легкового автомобіля Opel з розрахунком зчеплення та рульового керування /комплексний проєкт/ : випускна кваліфікаційна робота : 274 «Автомобільний транспорт» / Д. В. каптель ; керівник роботи О. О. Литвин ; НУ "Чернігівська політехніка", кафедра автомобільного транспорту та галузевого машинобудування. – Чернігів, 2021. – 74 с.Проведено аналітичний огляд легкових автомобілів схожих за параметрами та компонувальною схемою. Проведено визначення масових показників та параметрів автомобіля та двигуна. Проведено розрахунок зовнішньої швидкісної характеристики двигуна, силового балансу автомобіля та визначення параметрів трансмісії. Проведено розрахунок тягово-динамічних характеристик. Проведено розрахунок гальмівних властивостей і паливної економічності автомобіля. Розглянули види зчеплень автомобілів, виконали аналіз зчеплення автомобіля Opel Admiral, виконали розрахунок зчеплення. При виконанні кваліфікаційної роботи бакалавра, розрахунки та креслення виконували в таких програмах, як: “Компас 3D” та “Mathcad”.
An analytical inspection of cars similar in parameters and layout was conducted. The mass indicators and parameters of the car and the engine were determined. The calculation of the external speed characteristics of the engine, the power balance of the car and the definition of transmission parameters. The calculation of traction-dynamic characteristics is carried out. The braking properties and fuel efficiency of the car are calculated. We considered the types of clutches of cars, performed the analysis of the clutch of the car Opel Admiral, performed the calculation of the clutch. When performing the bachelor's qualification work, calculations and drawings were performed in such programs as: "Compass 3D" and "Mathcad".
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Гороховацька, Ю. В. "Дослідження процесу зносу деталей системи колінчастого вала та його впливу на ресурс та надійність автомобіля /комплексний проєкт/." Thesis, Чернігів, 2021. http://ir.stu.cn.ua/123456789/23215.
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Гороховацька, Ю. В. Дослідження процесу зносу деталей системи колінчастого вала та його впливу на ресурс та надійність автомобіля /комплекс-ний проєкт/ : випускна кваліфікаційна робота : 274 «Автомобільний транспорт» / Ю. В. Гороховацька ; керівник роботи В. І. Кальченко ; НУ "Чернігівська політехніка", кафедра автомобільного транспорту та галузевого машинобудування. – Чернігів, 2021. – 158 с.В даній кваліфікаційній роботі магістра проектується легковий повнопривідний автомобіль з модернізацією муфти зчеплення та проведений розрахунок сил які діють на колінчастий вал. У якості автомобіля прототипу було вибрано ВАЗ 2121 з попереднім його описом. Також визначенні масові показники автомобіля, побудовано зовнішню швидкісну характеристику двигуна та силовий баланс автомобіля. Проведений розрахунок двигуна, в якості прототипу - ВАЗ 2106. Проведено розрахунок показників динамічності, паливної економічності та гальмування автомобіля з побудовою відповідних графіків. Було розраховано основних функціональних елементів зчеплення автомобіля з його модернізацією, модернізація полягає в збільшенні діаметру фрикційних накладок зчеплення автомобіля.
In this qualifying work of the master, a passenger all-wheel drive car with modernization of the clutch is designed and the calculation of the forces acting on the crankshaft. VAZ 2121 with its preliminary description was chosen as a prototype car. Also the mass indicators of the car were determined, the external speed characteristic of the engine and the power balance of the car were built.The calculation of the engine, as a prototype - VAZ 2106. The calculation of indicators of dynamism, fuel economy and braking of the car with the construction of appropriate schedules. The main functional elements of the car's clutch with its modernization were calculated, the modernization consists in increasing the diameter of the car's clutch friction linings.
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Клишевський, Є. В. "Проєкт вантажного бортового автомобіля з дослідженням технологічного процесу відновлення чашки диференціала і балансиру задньої підвіски /комплексний проект/." Thesis, Чернігів, 2021. http://ir.stu.cn.ua/123456789/25313.
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Клишевський, Є. В. Проєкт вантажного бортового автомобіля з дослідженням технологічного процесу відновлення чашки диференціала і балансиру задньої підвіски /комплексний проект/ : випускна кваліфікаційна робота : 274 "Автомобільний транспорт" / Є. В. Клишевський ; керівник роботи В. В. Кальченко ; НУ "Чернігівська політехніка", кафедра автомобільного транспорту та галузевого машинобудування. – Чернігів, 2021. – 143 с.Дана пердставлена робота магістерська була виконана в повному обсязі й оформлена зі всіма параметрами та вихідними даними. Всі робота це розрахунок та описання автомобіля МАЗ 6303 його параметрів для розрахунку. Булу виконано загальний розрахунок всього автомобіля, його коробки перемикання передач, двигуна та навантаження на двигун. Розраховані динамічні параметрита паливна економічність машини, також гальмівні та рухові властивості та шлях гальмування. У конструкторській частині було розраховано всію підвіску автомобіля, його параметри та інші елементи. Також досліджено процес відновлення балансиру задньої підвіски автомобіля МАЗ 6303.Після чого було складено звіт та оформлено магістерську роботу. Для виконання розрахунків та графічної частини використовувались такі спеціальні програми як: “МS Office”, “Mathcad”, “Компас 3D.
This presented master's thesis was completed in full and designed with all the parameters and initial data. All work is the calculation and description of the car MAZ 6303 its parameters for calculation. The general calculation of the whole car, its gearbox, engine and engine load was performed. Calculated dynamic parameters of fuel efficiency of the machine, as well as braking and driving properties and braking distance. In the design part, the whole suspension of the car, its parameters and other elements were calculated. The process of restoring the balancer of the rear suspension of the MAZ 6303 car was also studied. After that, a report was prepared and a master's thesis was drawn up. Special programs such as “MS Office”, “Mathcad”, “Compass 3D” were used to perform calculations and graphics.
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Forman, Radek. "Průmyslová hala." Master's thesis, Vysoké učení technické v Brně. Fakulta stavební, 2012. http://www.nusl.cz/ntk/nusl-225667.
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Two-bay hall for warehouse and manufacturing purposes with supporting steel structure and thermally insulating sheating with width of 36 metres and lenght of 72 metres. The hall incorporates two overhead cranes with maximum load of 32 and 40 tonnes. The main supporting structure is a system of plate girders and beams. The beams are connected with hinges and are placed with intervals of 6 metres. The hall design is intended for 1st snowing area
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Лозовий, С. В. "Проєкт легкового автомобіля з дослідженням технологічного процесу відновлення шарніра рівних кутових швидкостей, відновлення розподільчого валу /комплексний проект/." Thesis, Чернігів, 2021. http://ir.stu.cn.ua/123456789/25318.
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Лозовий, С. В. Проєкт легкового автомобіля з дослідженням технологічного процесу відновлення шарніра рівних кутових швидкостей, відновлення розподільчого валу/комплексний проект/ : випускна кваліфікаційна робота : 274 "Автомобільний транспорт" / С. В. Лозовий ; керівник роботи В. І. Кальченко ; НУ "Чернігівська політехніка", кафедра автомобільного транспорту та галузевого машинобудування. – Чернігів, 2021. – 149 с.В моїй роботі магістра, було проведено порівняння та характеристика схожих за конструкцію автомобілів, вибрано авто-прототип ЗАЗ 1103 (Славута), виконано розрахунок потужності двигуна, вантажопідйомність автомобіля, передаточні числа КПП на 5 передачах та задня. Визначено параметри двигуна автомобіля, теплові характеристики, навантаження на КШМ. Розраховані параметри руху рівномірного та нерівномірного, паливна економічність. Розрахована гальмівна система, гальмівний привід, гальмівний шлях, зроблено модернізація елементів гальмування. Після виконано процес дослідження технологій відновлення шарніра рівних кутових швидкостей за з дефектами, у відповідності до завдання. Для виконання розрахунків та графічної частини використовувались такі спеціальні програми як: “Mathcad”, “Компас 3D”, “Paint”.
In my master's thesis, a comparison and characterization of similar cars was made, a car prototype ZAZ 1103 (Slavuta) was selected, engine power was calculated, the car's load capacity, gear ratios in 5 gears plus rear. The parameters of the car engine, thermal characteristics, load on KShM are defined. Calculated parameters of uniform and non-uniform motion, fuel economy. The brake system, brake drive, brake path are calculated, modernization of braking elements is made. After the process of research of technologies of restoration of the hinge of equal angular velocities on with defects, according to the task is executed. Special programs such as “Mathcad”, “Compass 3D”, “Paint” were used to perform calculations and graphics.
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Трушко, Д. В. "Проект легкового автомобіля з дослідженням технологічного процесу відновлення колінчастого валу." Thesis, Чернігів, 2021. http://ir.stu.cn.ua/123456789/25428.
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Трушко, Д. В. Проект легкового автомобіля з дослідженням технологічного процесу відновлення колінчастого валу : випускна кваліфікаційна робота : 274 "Автомобільний транспорт" / Д. В. Трушко ; керівник роботи О. О. Литвин ; НУ "Чернігівська політехніка", кафедра автомобільного транспорту та галузевого машинобудування. – Чернігів, 2021. – 159 с.В момент виконання випускної магістерської роботи, було визначено всі її параметри й по них виконано розрахунок всіх інших розділів дипломного проекту автомобіля. Далі порахувано двигун автомобіля його можливості та інші параметри теплові й викиди, розраховано динамічні масові показники засобу, проведено розрахунок економічності та гальм автомобіля. У спеціальній частині визначено види підвісок автомобілів ,їх параметрів та виконано розрахунок.Також досліджено процес відновлення колінчастого валу автомобіля ВАЗ 2109 на дефекти з завдання.
At the time of the master's thesis, I determined all its parameters and calculated all other sections of the diploma project of the car. Next, he calculated the car's engine capacity and other parameters of heat and emissions, calculated the dynamic mass performance of the vehicle, calculated the efficiency and brakes of the car. In a special part he identified the types of car suspensions, their parameters and performed the calculation. He also investigated the process of restoring the crankshaft of the car VAZ 2109 for defects in the task.
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Ghezzi, Ilaria. "Tribological and vibro-acoustic behaviour of a lubricated contact subjected to the stick-slip phenomenon : The case of the spring-brake system." Thesis, Lyon, 2020. http://www.theses.fr/2020LYSEI116.
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Les travaux de thèse proposent une approche complémentaire, combinant analyses dynamiques et tribologiques, au problème de stick-slip d’un contact graissé, dans un frein mécanique à ressort. L’instabilité de stick-slip est le résultat du couplage entre la réponse dynamique du système mécanique (frein) et la réponse locale du contact lubrifié à l’interface de freinage. La réponse locale du contact graissé a d’abord été caractérisée par des tests expérimentaux effectués sur tribomètre. Ensuite, les conditions qui conduisent à l'instabilité ont pu être investiguées en détail, à l’aide d’un modèle numérique a paramètres concentres du système complet. Ce modèle simule le comportement dynamique global du système de freinage mécanique. En entrées, il prend les paramètres propres au fonctionnement et à la conception du frein, ainsi que les courbes de frottement locales. En sortie, le poids de chacun des paramètres sur la génération du stick-slip a donc pu être analysé. Enfin, une étude expérimentale de l’influence des différents composants de la lubrification (DLC et graisse) sur le comportement du contact frottant lubrifié a été réalisée. Dépendante de l’épaississant, de l’huile et des additifs, la rhéologie complexe de la graisse est un point clé pour comprendre l'apparition du stick-slip. En effet si la lubrification est traditionnellement censée réduire les pertes par frottement, elle peut malgré tout participer à l’apparition d’instabilités. La compréhension des conditions pour lesquelles un système est prédisposé au phénomène de stick-slip peut permettre de prévenir l'apparition de telles instabilités et des nuisances qu’elles engendrent. Néanmoins, en présence de contacts lubrifiés, la littérature n’y consacre que peu de travaux. C’est dans ce contexte que l’analyse multi-approches présentée dans cette thèse permet de contribuer à la compréhension de l’apparition des instabilités de frottement dans les contacts lubrifiés avec graisse, en apportant également des éléments de solution dans le cas d’une application spécifiqueThe thesis works propose a complementary approach, combining dynamic and tribological analyzes, to the stick-slip problem of a greased contact, in a mechanical spring brake. Stick-slip instability is the result of the coupling between the dynamic response of the mechanical system (brake) and the local response of the lubricated contact at the brake interface. The local response of the greased contact was first characterized by experimental tests performed on a tribometer. Then, the conditions which lead to instability have been investigated in detail, using a numerical lumped model of the complete system. This model simulates the overall dynamic behavior of the mechanical braking system. As inputs, it takes the parameters specific to the operation and design of the brake, as well as the local frictional behavior obtained experimentally. At the output, the influence of each of the parameters on the generation of the stick-slip has been therefore analyzed. Finally, an experimental study of the influence of the different lubricant components (DLC and grease) on the behavior of the lubricated frictional contact has been carried out. Dependent on thickener, oil and additives, the complex rheology of grease is a key point for the understanding of the stick-slip appearance. Indeed, if lubrication is traditionally supposed to reduce friction losses, it can also participate in the appearance of instabilities. Understanding the conditions for which a system is predisposed to the stick-slip phenomenon can help prevent the appearance of such instabilities and the nuisance they cause. However, in the presence of lubricated contacts, the literature shows a lack of informations. It is in this context that the multi-approach analysis presented in this thesis makes it possible to contribute to the understanding of the appearance of friction instabilities in contacts lubricated with grease, by also providing elements of solution in the case of a specific application
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Бакал, Є. О. "Проєкт вантажного автомобіля з дослідженням сил тертя та зносу поршня в з’єднанні поршень-поршневий палець." Thesis, Чернігів, 2021. http://ir.stu.cn.ua/123456789/23207.
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Бакал, Є. О. Проєкт вантажного автомобіля з дослідженням сил тертя та зносу поршня в з’єднанні поршень-поршневий палець : випускна кваліфікаційна робота : 274 «Автомобільний транспорт» / Є. О. Бакал ; керівник роботи В. В. Кальченко ; НУ "Чернігівська політехніка", кафедра автомобільного транспорту та галузевого машинобудування. – Чернігів, 2021. – 160 с.При виконанні випускної кваліфікаційної роботи магістра, визначив масові показники й параметри автомобіля, провів розрахунок двигуна автомобіля, розрахували показники динамічності автомобіля, його гальмівні властивості та паливну економічність. У спеціальній частині магістерської роботи було розглянуто види зчеплень, та виконали розрахунок зчеплення автомобіля який проектується. Також кожен з розділів має креслення, в загальній кількості 12 штук формату А1 на всю магістерську роботу.
During the final qualification work of the master, he determined the mass indicators and parameters of the car, calculated the car engine, calculated the dynamics of the car, its braking properties and fuel efficiency. In a special part of the master's thesis, the types of clutches were considered, and the clutch of the projected car was calculated. Also, each of the sections has drawings, a total of 12 pieces of A1 format for the entire master's thesis.
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Метьолкін, О. С. "Проєкт легкового автомобіля з дослідженням сил тертя та зносу поршня в з’єднанні поршень-поршневий палець." Thesis, Чернігів, 2021. http://ir.stu.cn.ua/123456789/23209.
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Метьолкін, О. С. Проєкт легкового автомобіля з дослідженням сил тертя та зносу поршня в з’єднанні поршень-поршневий палець : випускна кваліфікаційна робота : 274 «Автомобільний транспорт» / О. С. Метьолкін ; керівник роботи В. В. Кальченко ; НУ "Чернігівська політехніка", кафедра автомобільного транспорту та галузевого машинобудування. – Чернігів, 2021. – 162 с.При виконанні кваліфікаційної роботи, визначено масові показники й параметри автомобіля, проведено розрахунок двигуна автомобіля, розраховано показники динамічності автомобіля, його гальмівні властивості та паливну економічність. У спеціальній частині кваліфікаційної роботи було розглянуто види зчеплень, та виконали розрахунок зчеплення автомобіля який проектується. Також окрім розділів кваліфікаційна робота має креслення, в загальній кількості 12 аркушів формату А1.
During the qualification work, the mass indicators and parameters of the car were determined, the car engine was calculated, the car dynamics indicators, its braking properties and fuel efficiency were calculated. In the special part of the qualification work, the types of clutches were considered, and the clutch of the projected car was calculated. Also, in addition to sections, the qualifying work has drawings, a total of 12 sheets of A1 format.
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Васильєв, Володимир Іванович, Владимир Иванович Васильев, and Volodymyr Ivanovych Vasyliev. "Обоснование рациональных динамических параметров предохранительного торможения шахтных подъемных установок." Thesis, Нац. техн. ун-т Укр. "КПИ", 2012. http://essuir.sumdu.edu.ua/handle/123456789/29956.
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Робота присвячена питанням досліджень робочого і автоматично регульованого запобіжного гальмування на багатоканатних і нахилених ШПУ з системами гальм радіального й дискового типу і з метою забезпечення їх ефективної та безпечної експлуатації.
В дисертації вперше поставлене і вирішене науково-технічне завдання формування раціональних динамічних параметрів запобіжного і робочого гальмування, з урахуванням природних інерційних і нелінійних властивостей підсистем підіймальної установки.
Методи досліджень: аналіз стану систем запобіжного та робочого гальмування; математичне, комп’ютерне моделювання процесів і систем; розробка алгоритмів і систем запобіжного гальмування; промислові випробування. Обґрунтовані принципи, алгоритми, способи раціональних режимів гальмування.
При цитуванні документа, використовуйте посилання http://essuir.sumdu.edu.ua/handle/123456789/29956Работа посвящена вопросам исследований автоматически регулируемого предохранительного и рабочего торможения на вертикальных и наклонных шахтных подъемных установках с радиальными и дисковыми тормозами с целью обеспечения их эффективной и безопасной эксплуатации. В диссертации впервые поставлена и решена научно-техническая задача исследования и формирования рациональных динамических параметров ШПУ в режимах предохранительного и рабочего торможения. Методы исследований: анализ состояния современных систем предохранительного и рабочего торможения, математическое и компьютерное моделирование динамических процессов, разработка способов, алгоритмов и систем, обеспечивающих повышение точности, быстродействия и безопасности режимов эксплуатации, экспериментальные исследования и промышленные испытания. Обосновано применение метода структурного моделирования с использованием вспомогательных граничных упругих связей для описания динамики предохранительного и рабочего торможения ШПУ. Разработаны цифровые модели систем АРПТ подъемных установок с тормозом одностороннего и двухстороннего действия. Результаты моделирования показали совпадение расчетных данных с результатами натурных испытаний не хуже 18%. Установлено, что наиболее перспективным направлением является разработка замкнутых систем АРПТ по замедлению, которые позволяют поддерживать заданное замедление, независимо от типа подъемной установки, направления движения, статической нагрузки, изменения параметров тормоза; используя систему двустороннего регулирования тормозного момента повысить быстродействие и улучшить динамику процесса; при учете параметров упругой части уравновешенного подъема на основной частоте, строить разомкнутые адаптивные системы с формированием рациональных по динамическим нагрузкам воздействий на тормоз, что предотвращает колебательные перераспределения энергии в упругой части подъема, улучшает быстродействие и безопасность. Основные результаты работы использованы при разработке технической документации и внедрении в серийное производство систем АРПТ и АИПТ ШПУ. При цитировании документа, используйте ссылку http://essuir.sumdu.edu.ua/handle/123456789/29956
Thesis is devoted to the scientific and technical problem of formation of rational parameters of emergency braking, in view of influence of inertial properties of elevating installation and a braking driver. Methods of researches: the analysis of modern systems of emergency braking; mathematical, digital modeling and computer simulation of dynamics; designing of methods, algorithms and devices of rational modes of emergency braking; laboratory researches and industrial trials. The main outcomes of researching were utilized at mining project and order bookings at industrial systems. Industrial trials and the serial production of systems were realized in conditions of mines. When you are citing the document, use the following link http://essuir.sumdu.edu.ua/handle/123456789/29956
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Ус, Д. О. "Проєкт вантажного автомобіля /комплексний/ проєкт/ з розрахунком роздавальної коробки та розробкою технологічного процесу відновлення первинного вала." Thesis, Чернігів, 2021. http://ir.stu.cn.ua/123456789/23194.
Full textAbstract:
Ус, Д. О. Проєкт вантажного автомобіля /комплексний проєкт/ з розрахунком роздавальної коробки та розробкою технологічного процесу відновлення первинного вала : випускна кваліфікаційна робота : 274 «Автомобільний транспорт» / Д. О. Ус ; керівник роботи Я.В. Кужельний ; НУ "Чернігівська політехніка", кафедра автомобільного транспорту та галузевого машинобудування. – Чернігів, 2021. – 173 с.При виконанні кваліфікаційної роботи магістра, визначили масові показники й параметри автомобіля, провели розрахунок двигуна автомобіля, розрахували показники динамічності автомобіля, його гальмівні властивості та паливну економічність. У спеціальній частині магістерської роботи було розглянуто види роздавальних коробок та виконали розрахунок роздавальної коробки автомобіля, який проектується. Розроблено технологічний процес відновлення первинного валу роздавальної коробки, який складається з наступних пунктів: характеристика деталі, вибіру способів відновлення деталі, розрахунок припусків на обробку й режимів обробки та розрахунок норм часу на кожну стадію обробки. Дипломна робота має креслення, в загальній кількості 12 штук формату А1 з графіками та схемами. Для виконання розрахунків та графічної частини використовувались такі програми як: “Mathcad”,“Компас 3D”.
During the qualification work of the master, determined the mass indicators and parameters of the car, calculated the engine of the car, calculated the dynamics of the car, its braking properties and fuel economy. In a special part of the master's thesis, the types of transfer cases were considered and the calculation of the transfer case of the car being designed was performed. Restoration of the primary shaft of the transfer case is made, which consists of the following points: characteristic of a detail, a choice of ways of restoration of a detail, calculation of allowances for processing and modes of processing and calculation of norms of time for each stage of processing. Thesis has drawings, a total of 12 pieces of A1 format with graphs and diagrams. Programs such as “Mathcad”, “Compass 3D” were used to perform calculations and graphical part.
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Mirza, N., Khalid Hussain, Andrew J. Day, and J. Klaps. "Effect of component stiffness and deformation on vehicle lateral drift during braking." 2009. http://hdl.handle.net/10454/2610.
Full textAbstract:
This article presents a simulation study into effects of compliant (flexible) components
(such as the engine subframe and the lower control arm) and their deflections on the characteristics
of a vehicle experiencing steering drift during straight-line braking. The vehicle front and
rear suspension are modelled using multi-body dynamic analysis software. The front suspension
model represents theMacPherson strut design of the vehicle and includes a rack and pinion steering
system, brake system, engine subframe, and a powertrain unit. The model has been analysed
under two steering control methods: fixed and free control. Suspension characteristics and the
effect of deflections arising from the subframe and the lower control arm on these suspension
characteristics have been analysed.
The simulations confirmed that variation of component stiffness and interactions within components
give rise to side-to-side deflections that could affect lateral drift during braking. It is
concluded that side-to-side variation of suspension characteristics can have a detrimental effect
on lateral drift during braking and that compliant components whose stiffness varies from side
to side can cause different side-to-side deflections that can induce and influence variation in
suspension characteristics such as toe steer angle that can lead the vehicle during braking.
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Mirza, N., Khalid Hussain, Andrew J. Day, and J. Klaps. "Investigation of dynamic characteristics of suspension parameters on a vehicle experiencing steering drift during braking." 2005. http://hdl.handle.net/10454/884.
Full textAbstract:
YesThis paper presents a simulation study into the characteristics of a vehicle experiencing steering drift under straight line braking. Simulation modelling has been performed using a multi-body dynamics analysis based on a model of an actual vehicle. Front and rear suspension parameters have been modelled as rigid links joined with flexible bushes so as to assess their effect on a vehicle while braking. Suspension geometry and alignment settings, which define characteristic responses such as lateral acceleration, yaw velocity, toe, and caster angles of a vehicle in a transient manoeuvre, are primary to a vehicle¿s directional stability. Any symmetric inconsistencies in these settings will potentially affect a vehicle¿s performance. The findings from this research have increased the understanding of the causes of steering drift during braking conditions.
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Sweed, Emad Mazen. "Design and finite element analysis of formula student braking system." Master's thesis, 2021. http://hdl.handle.net/10198/24728.
Full textAbstract:
The present project focuses on the research and design of a braking system for sports vehicles. The braking system will be included in a vehicle being developed by the IPB Motorsport Team in order to participate in an annual worldwide collegiate design competition called Formula Student. The competition evaluates a Formula style car's engineering, performance, and cost.
Since it was the first vehicle of this style to be designed at IPB, the values were analysed and estimated for the under-design vehicle. A methodology has been developed using the theory of vehicle dynamics to design a braking system capable of meeting the technical requirements of the competition.
Another part of this research included analysing the behaviour of brake rotors made of various materials (Gray Cast Iron, Aluminium Alloy) and Geometry (Drilled, Solid) using Finite Element Analysis (FEA) more precisely the ANSYS software version 21. Static and thermal simulations were conducted for the design.
As a result, a brake system assembly capable of achieving a four-wheel lock is demonstrated. Gray cast iron has superior thermal and static capabilities than aluminium, and the rotor geometry has an effect on the stress distribution.
The simulations proved to be very useful in determining the most suitable brake rotor material and cooling shape for the brake rotors.O presente projeto centra-se na investigação e concepção de um sistema de travagem para veículos desportivos. O sistema de frenagem será incluído em um veículo que está sendo desenvolvido pela IPB Motorsport Team para participar de uma competição universitária anual de design chamada Formula Student. A competição avalia a engenharia, o desempenho e o custo de um carro estilo Fórmula. Por ter sido o primeiro veículo desse estilo a ser projetado no IPB, os valores foram analisados e estimados para o veículo em projeto. Foi desenvolvida uma metodologia a partir da teoria da dinâmica veicular para projetar um sistema de frenagem capaz de atender aos requisitos técnicos da competição. Outra parte desta pesquisa incluiu a análise do comportamento dos rotores dos freios feitos de diversos materiais (Ferro Fundido Cinza, Liga de Alumínio) e da Geometria (Perfurada, Sólida) utilizando a Análise de Elementos Finitos (FEA), mais precisamente o software ANSYS versão 21. Estático e térmico simulações foram realizadas para o projeto. Como resultado, é demonstrado um conjunto de sistema de freio capaz de obter um travamento nas quatro rodas. O ferro fundido cinzento tem capacidades térmicas e estáticas superiores do que o alumínio, e a geometria do rotor tem um efeito na distribuição de tensões. As simulações provaram ser muito úteis para determinar o material do rotor do freio e a forma de refrigeração mais adequados para os rotores do freio.
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Yang, Shaw-Jing, and 楊紹經. "Dynamic Control Analysis of Eddy Current Braking System." Thesis, 1998. http://ndltd.ncl.edu.tw/handle/58398107629608359951.
Full textAbstract:
碩士國立清華大學
動力機械工程學系
86
The objective of this thesis is to provide an auxiliary braking system, namely eddy current brakes, for the high speed railway vehicles. Due to the reduction of the adhesions between the rail and the wheels are in high speed region, the acceleration and braking forces based on the adhesions are reduced. In order to provide sufficient braking capacity for the high speed vehicles, a thorough analysis based on the Fourier Series for eddy current brakes has been conducted. In the thesis, nonlinear BH magnetic characteristics of the rail have been considered. The results based on the method have been compared and high speed experimentation has been employed for verifying the simulation results. Also, further analysis on the temperature rise on the rail surface has been investigated by numerical simulations. In addition, test results on constant braking force design have been shown in this thesis to illastrate a possible way on controlling the brakes.
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Hxiao, Yuting, and 蕭煜庭. "Dynamic Braking of a Voltage Supplied for Single Phase Induction Motor." Thesis, 2011. http://ndltd.ncl.edu.tw/handle/48366843744876709401.
Full textAbstract:
碩士大葉大學
工學院碩士在職專班
99
ABSTRACT DC injection braking systems provide a simple, rapid and reliable solution as they are incorporated within the control function and utilize the existing motor drive. The main purpose of this paper is to design a DC injection braking system for a single –phase induction motor drive. First, the single phase induction was designed through finite element method. Simulation results, including flux lines, flux density and magnetic field distribution. The designed DC injection braking modules utilize Programmable logic controller, transformer, rectifier and magnetic contacts to switch the injected DC current into the motor windings. DC injection braking can provide the motor braking force during stop when AC power is removed from the motor. DC magnetic field introduced into the stator will create a powerful braking force on the spinning rotor. This DC injection current may be increased to provide more braking torque from the single induction motor. Experimental results show that the DC injection is an effective braking method for the single-phase induction motor can also be applicable in the case of the three -phase induction motor. Keywords: dc injection braking, finite element method, single-phase induction motor, dynamic braking
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Klaps, J., and Andrew J. Day. "Steering drift and wheel movement during braking: static and dynamic measurements." 2005. http://hdl.handle.net/10454/881.
Full textAbstract:
YesThis paper reports on an experimental investigation into braking-related steering drift in motor vehicles, and follows on from a previous paper by the authors in which it was concluded that braking can cause changes in wheel alignment that in turn affect the toe-steer characteristics of each wheel and therefore the straight-line stability of the vehicle during braking. Changes in suspension geometry during braking, their magnitude and the relationships between the braking forces and the suspension geometry and compliance are further investigated in an experimental study of wheel movement arising from compliance in the front suspension and the steering system of a passenger car during braking. Using a kinematic and compliance (K&C) test rig, movement of the front wheels and the suspension subframe, together with corresponding changes in suspension and steering geometry under simulated braking conditions, have been measured and compared with dynamic measurements of the centre points of the front wheels. The results have enabled the causes and effects of steering drift during braking to be better understood in the design of front suspension systems for vehicle stability during braking.
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Liao, Yu-Wei, and 廖昱維. "Design Software for a Dynamic Test Rig on Bicycle Braking System." Thesis, 2003. http://ndltd.ncl.edu.tw/handle/56938692488031387224.
Full textAbstract:
碩士國立交通大學
機械工程系
91
After making a survey for the bicycle test rigs that can be searched nowadays, one can find that there are some references about dynamic test on bicycle braking system. However, discussion the important braking conditions, load-transfer effect, there is few reference to mention about these simulation and the test system. It requires an additional hypothesis or inference to simulate the real braking behavior in the further study. In these conditions, some unknown braking conditions maybe ignored unconsciously. Therefore, an appropriate braking simulation with load-transfer effect will be developed to a better test braking system. The object of this study is to design complete test software, which can work on a new developed dynamic bicycle test rig. It can record real-time braking signals in the testing for the specific functions on bicycle braking system. The whole results of braking behavior by means of analyzing the testing data can be obtained in this study, and expecting to provide this study a reference for further design and safety testing on the bicycle braking system.