Journal articles on the topic 'Vehicle performance calculations'
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Szodrai, Ferenc, Sándor Pálinkás, and György Juhász. "Calculations of Performance Losses for Automobile Vehicles." International Journal of Engineering and Management Sciences 5, no. 2 (April 15, 2020): 210–18. http://dx.doi.org/10.21791/ijems.2020.2.27.
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Vehicle-energetic-models are used to analyze the performances and when a comprehensive structure is established even optimization could be done. For these kinds of models, the losses of the vehicles have to be known. These losses could significantly effect of the vehicle fuel consumption. From these losses the rolling resistance, drive elements and aerodynamic drag are discussed. This paper reviews some of the literatures that describes the calculation methods and gives us some idea about the degree of their value. Our further goals are to have an UpToDate loss coefficient dataset and calculation methods for further vehicle-energetic modelling.
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Vasiliev, Ya V., and V. V. Voronin. "Methodology for calculatingthe performance of forces working on the vehicle rollover at carrying out the road traffic accident examination." Вестник гражданских инженеров 18, no. 6 (2021): 158–64. http://dx.doi.org/10.23968/1999-5571-2021-18-6-158-164.
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This article discusses a method for calculating the performance of forces working on the overturning the vehicle. The method is used in case of carrying out an expert examination aimed at assessing the vehicle speed before, at the time and after an accident. The calculation methodology is based on the results of the analysis of field crash tests and data stored in the EDR (Event Data Recorder). The results of the comparison of calculations according to the proposed methodology and the generally accepted methodology are presented.
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Ui, Fitriyanti, Yuliyanti Kadir, and Marike Mahmud. "Penentuan Nilai Ekivalen Kendaraan Ringan (Ekr) Untuk Kendaraan Becak Motor (Bentor) Pada Ruas Jalan Arif Rahman Hakim dan Jalan Manggis Kota Gorontalo." Journal Of Applied Civil and Environmental Engineering 1, no. 1 (September 17, 2020): 1. http://dx.doi.org/10.31963/jacee.v1i1.2175.
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The equivalent value of light vehicles (elv) is influenced by the size and speed of the vehicle, the greater the vehicle the equivalent value of light vehicles (elv) the higher, the higher the vehicle speed the equivalent value of light vehicles (elv) will be lower. The purpose of this study is to determine the equivalent value of light vehicles (elv) for motor tricycles vehicle (mtv) as part of the traffic and the performance of the Arif Rahman Hakim Road and Gorontalo City Manggis Road. The location of the study was conducted on Jalan Arif Rahman Hakim and Manggis Street. Primary data collected is data of traffic flow volume. The analysis was carried out using the simple linear regression analysis method and the 2014 Indonesian road capacity guidelines. From the calculation results obtained an equivalent value of light vehicles (elv) for motor tricycles vehicle (mtv) on the Arif Rahman Hakim Road section of 0.55 and on the Manggis Road section obtained an equivalent value of light vehicles (elv) of 0.46. Then do the calculations to analyze the performance of the Arif Rahman Hakim and Manggis Roads obtained the degree of saturation (DS) <0.85. The DS scores show that both locations are very suitable to serve the flow of traffic during peak hours.Keywords—elv, motor tricycles vehicle , linear regression, road performance
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Kajackas, Algimantas, Vidas Žuraulis, and Edgar Sokolovskij. "Influence of VANET System on Movement of Traffic Flows in Emergency Situations." PROMET - Traffic&Transportation 27, no. 3 (June 30, 2015): 237–46. http://dx.doi.org/10.7307/ptt.v27i3.1612.
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The paper presents Vehicular Ad Hoc Network (VANET) system based on an analysis of the movement of a motorcade in an emergency situation. This analysis seeks to answer the question: when and under what conditions Emergency Message (EM) sent by Vehicle-to-Vehicle (V2V) system reaches the final target to help in preventing of serious accidents, such as multi-vehicle collisions. The model of calculation based on the key principles of vehicle braking enables finding the time to possible collision and the residual velocity of the vehicle. In the calculations, the average values of the driver’s reaction time are accepted; in addition, a sent emergency message is considered to be free of interference. Upon choosing different road and driving conditions, it is found what vehicle of the motorcade stops before the possible obstacle on emergency braking. The performance of vehicles with and without VANET system is compared.
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Nhan, TRAN Huu, NGUYEN Ngoc Thanh, VO Ba Khanh Trinh, and NGUYEN Van Nguyen. "Dynamic analysis of small gasoline car model powertrain using MATLAB / SIMDRIVELINE." Science & Technology Development Journal - Engineering and Technology 3, SI2 (April 15, 2021): first. http://dx.doi.org/10.32508/stdjet.v3isi2.575.
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The powertrain model of a vehicle using a small gasoline engine is designed based on the analysis results of the Matlab/Simdriveline simulation model. In which, the vehicle's powertrain model parts include: engine, clutch, gearbox, differential and wheels, and overall vehicle modeled by Matlab/ Simdriveline. Mathematical basis of the corresponding models for systems or components are used to build simulated models for the entire vehicle's powertrain system. The input parameters for the simulation problem include parameters of the size, mass, structural and technical parameters of each system such as transmission ratio, power, velocity, efficiency, determined based on actual vehicle model and empirical calculations. The simulation calculation process is done on the basis of the variation of the engine power, from which, the corresponding input and output kinetic and dynamic parameters of each system in the powertrain system consists of clutch, gearbox, differential, are obtained in the time domain. The results of simulation calculation of the kinematics and dynamics of each system in the vehicle's powertrain are analyzed as a basis for design improvement to improve the dynamic performance of the vehicle model.
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Wang, Wen-Hao, Xiao-Jun Xu, Hai-Jun Xu, and Fa-Liang Zhou. "Enhancing lateral dynamic performance of all-terrain vehicles using variable-wheelbase chassis." Advances in Mechanical Engineering 12, no. 5 (May 2020): 168781402091777. http://dx.doi.org/10.1177/1687814020917776.
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A six-wheel vehicle chassis scheme with a variable wheelbase is proposed to improve the lateral dynamic performance of vehicles. The yaw moment is varied by changing the wheelbase to enhance the lateral dynamic performance of the vehicle. A vehicle lateral dynamics model is established using this approach. The effects of the wheelbase variation on the lateral yaw rate gain, steering stability, and steering error are analysed via numerical calculations. A strategy for wheelbase variation under different working conditions is proposed to enhance the lateral dynamic performance. In addition, by studying the response of the vehicle to various lateral disturbance forces, it is verified that the wheelbase change can enhance the lateral anti-disturbance capability of the vehicle. The simulation verifies the effectiveness of the wheelbase change strategy under a variety of driving conditions.
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Kaspul Anuar, Musthafa Akbar, Hanif Abdul Aziz, and Agung Soegihin. "Experimental Test on Aerodynamic Performance of Propeller and Its Effect on The Flight Performance of Serindit V-2 UAV." Journal of Advanced Research in Fluid Mechanics and Thermal Sciences 91, no. 2 (February 11, 2022): 120–32. http://dx.doi.org/10.37934/arfmts.91.2.120132.
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The Serindit V-2 is a flying vehicle (UAV) that was successfully developed to participate in the Indonesian Flying Robot Contest with a mission to fly at high speed and acceleration. The purpose of this research is to obtain the optimum aerodynamic performance of the propeller and its effect to the flight performance of the Serindit V-2 Unmanned Aerial Vehicle (UAV). The study began by testing the aerodynamic performance of propellers (static thrust value, time consumed, and power consumed) with different sizes of propellers, ranging from 8 inches to 12 inches. From the test results, the 12-inch propeller at 100% throttle generates the highest thrust value of 29.607 N, time consumed of 4.91 minutes, and power consumed of 717.57 Watt. The study was continued by calculating the flight performance with the results that the maximum speed value was 24.11 m/s, the rate of climb was 3.347 m/s, and the stall speed was 14.6 m/s. Finally, the Serindit V-2 UAV was tested to fly using a propulsion system with a 12-inch propeller and varied throttle opening from 50% to 100%. The test results show the vehicle's maximum speed of 24,562 m/s is obtained at a throttle opening of 100%. The climb rate and the flight time at 100% throttle opening is 2,656 m/s and 3 minutes 27 seconds, while the vehicle's stall speed during cruising flight (angle of attack at 1 degree) is 13 m/s. The difference between the theoretical calculation results and the actual test is at least caused by 2 factors. The first is the aerodynamic factor, in theoretical calculations, the overall aerodynamic design of the aircraft is considered very smooth/seamless. This has an impact on the fluid flow that occurs on the aircraft. On the actual conditions, the vehicle has several parts that cause drag, such as the pitot sensor located at the tip of the right-wing, and the ballast located on the left-wing.
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Lukoševičius, Vaidas, Rolandas Makaras, Arūnas Rutka, Robertas Keršys, Andrius Dargužis, and Ramūnas Skvireckas. "Investigation of Vehicle Stability with Consideration of Suspension Performance." Applied Sciences 11, no. 20 (October 19, 2021): 9778. http://dx.doi.org/10.3390/app11209778.
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The issue of movement stability remains highly relevant considering increasing vehicle speeds. The evaluation of vehicle stability parameters and the modeling of specific movement modes is a complex task, as no universal evaluation criteria have been established. The main task in modeling car stability is an integrated assessment of the vehicle’s road interactions and identification of relationships. The main system affecting the vehicle’s road interaction is the suspension of the vehicle. Vehicle suspension is required to provide constant wheel to road surface contact, thus creating the preconditions for stability of vehicle movement. At the same time, it must provide the maximum possible body insulation against the effect of unevennesses on the road surface. Combining the two marginal prerequisites is challenging, and the issue has not been definitively solved to this day. Inaccurate alignment of the suspension and damping characteristics of the vehicle suspension impairs the stability of the vehicle, and passengers feel discomfort due to increased vibrations of the vehicle body. As a result, the driving speed is artificially restricted, the durability of the vehicle body is reduced, and the transported cargo is affected. In the study, analytical computational and experimental research methods were used. Specialized vehicle-road interaction assessment programs were developed for theoretical investigation. The methodology developed for assessing vehicle movement stability may be used for the following purposes: design and improvement of vehicle suspension and other mechanisms that determine vehicle stability; analysis of road spans assigned with characteristic vehicle movement settings; road accident situation analysis; design of road structures and establishment of certain operational restrictions on the road structures. A vehicle suspension test bench that included original structure mechanisms that simulate the effect of the road surface was designed and manufactured to test the results of theoretical calculations describing the work of the vehicle suspension and to study various suspension parameters. Experimental investigations were carried out by examining the vibrations of vehicle suspension elements caused by unevenness on the road surface.
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Pham, Xuan Mai, Ga Van Bui, Ha Pham, and Le Hoang Phu Pham. "Design Process of Electric Vehicle Power System." Applied Mechanics and Materials 907 (June 22, 2022): 101–14. http://dx.doi.org/10.4028/p-vkvz26.
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This paper presents the research on the process of designing and optimizing the powertrain of electric vehicles, such as the general arrangement of electric vehicles, the design of electric motors, transmission systems, battery systems, as well as selecting the appropriate layout design. In addition, the article analyzes the computational models of electric drive systems, energy systems and calculates the performance of these systems in accordance with actual use. Finally, design and simulation calculations of the powertrain and energy of electric vehicles are performed using Simcenter Amesim software. Keywords: Electric vehicle, battery, electric motor, Simcenter Amesim
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Hegedűs-Kuti, János, and Mátyás Andó. "Performance of Cell Phone Controlled Model Vehicle." Mérnöki és Informatikai Megoldások, no. II. (October 7, 2020): 14–20. http://dx.doi.org/10.37775/eis.2020.2.2.
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The objective of the project was to construct a model car - using additive technology - which is connected to a phone via cordless communication. PLA was used as a material to print the units. The total weight of the model car is 690 grams including the electronic components. The power consumption and driving properties were measured under given circumstances. Based on our calculations, even in active use at its maximum speed of 5.16 km/h, the system is capable of at least 3.9 hours of operation, while full charging takes only 3 hours. As a result, with two battery units it can be operated continuously.
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Kumar, Prabhat, and Vishal Shrivastava. "Integration of Cloud Computing and Artificial Intelligence in Driverless Car Using High Performance Behavioural Cloning." International Journal on Recent and Innovation Trends in Computing and Communication 7, no. 8 (August 23, 2019): 13–18. http://dx.doi.org/10.17762/ijritcc.v7i8.5347.
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Research on autonomous vehicle system has risen in the past couple of years. It has posed challenges to the researchers to develop an understanding about the real time scenarios. Deep Learning has demonstrated its extraordinary computational potential by transcending its abilities into more complex areas, where pattern matching, image recognition and behavioral cloning plays a vital role.
The system consists of Image Processing and analyzing of the training data into behavioral cloning of the vehicle in a simulated environment. A control algorithm responsible for consolidating the sub systems calculations of the correct steering angle is used to keep the vehicle within the lane markings of the road. The solution proposed requires a better data collection and data interpretation. Addition of cloud computing fastens the data calculation and hence improves the performance of the system.
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Xu, Pengfei, Chenbo Han, Tao Lv, and Hongxia Cheng. "Underwater Absorber for a Remotely Operated Vehicle." Journal of Marine Science and Engineering 10, no. 4 (April 1, 2022): 485. http://dx.doi.org/10.3390/jmse10040485.
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Fixed-point underwater hovering is a key technology for the reliable operation of a remotely operated vehicle in the ocean to inspect the surfaces of a variety of underwater structures, such as ports and offshore wind power facilities. This study proposes an underwater wall absorber that can be used in remotely operated vehicles. First, we explain the working principle of the underwater absorber. Second, we analyze the main factors affecting its adsorption performance by using numerical simulations. Finally, we show the results of a tested prototype of the proposed absorber, whose performance was consistent with the results of numerical calculations. The proposed absorber may have important technical prospects for use in remotely operated underwater vehicles.
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Aulia Dewi Fatikasari and Nia Dwi Puspitasari. "ROAD PERFORMANCE ANALYSIS USING PKJI 2014 METHOD (CASE STUDY : TROSOBO-KLETEK ROAD, SIDOARJO DISTRICT)." CI-TECH 2, no. 2 (November 20, 2021): 23–29. http://dx.doi.org/10.33005/ci-tech.v2i2.41.
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The Trosobo-Kletek Highway is one of the roads that has a high level of vehicle density so that it appears that it has experienced traffic jams several times. This is also coupled with the presence of side barriers such as vehicles in and out. So that the Trosobo-Kletek Highway section often experiences traffic jams that occur not only at certain hours, because on this road section there are many factory areas. The important role of this road resulted in a decrease in the level of service. Based on this, it is necessary to monitor the quality of a road segment based on the level of service. In this study, the PKJI 2014 was used to calculate the road performance. As for some of the data needed such as traffic volume, road geometry, and vehicle speed. The analysis carried out is the calculation of Road capacity, peak hour volume, degree saturation, free flow speed, and level of service index. The results of the research conducted during the four days of the survey and the calculations that have been carried out is level of service in the direction of Surabaya-Mojokerto is E and the direction of Mojokerto-Surabaya is F.
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Rhudy, Matthew, Yu Gu, Jason Gross, and Marcello R. Napolitano. "Evaluation of Matrix Square Root Operations for UKF within a UAV GPS/INS Sensor Fusion Application." International Journal of Navigation and Observation 2011 (January 4, 2011): 1–11. http://dx.doi.org/10.1155/2011/416828.
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Using an Unscented Kalman Filter (UKF) as the nonlinear estimator within a Global Positioning System/Inertial Navigation System (GPS/INS) sensor fusion algorithm for attitude estimation, various methods of calculating the matrix square root were discussed and compared. Specifically, the diagonalization method, Schur method, Cholesky method, and five different iterative methods were compared. Additionally, a different method of handling the matrix square root requirement, the square-root UKF (SR-UKF), was evaluated. The different matrix square root calculations were compared based on computational requirements and the sensor fusion attitude estimation performance, which was evaluated using flight data from an Unmanned Aerial Vehicle (UAV). The roll and pitch angle estimates were compared with independently measured values from a high quality mechanical vertical gyroscope. This manuscript represents the first comprehensive analysis of the matrix square root calculations in the context of UKF. From this analysis, it was determined that the best overall matrix square root calculation for UKF applications in terms of performance and execution time is the Cholesky method.
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Ghassemi, Hassan, and Mohsen Taherinasab. "Numerical calculations of the hydrodynamic performance of the contra-rotating propeller (CRP) for high speed vehicle." Polish Maritime Research 20, no. 2 (April 1, 2013): 13–20. http://dx.doi.org/10.2478/pomr-2013-0012.
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Abstract Several different methods have been used to analyze the marine propellers. In this paper a boundary element method (BEM) for modelling steady hydrodynamic performance of a contra-rotating propeller (CRP) has been developed. The potential flow across the front and rear propellers have been considered. By calculating the induced flow, the interaction between two propellers is studied. This method has been applied to a typical CRP. The results are included in the form of the hydrodynamic performance coefficients, total thrust and torques. Numerical calculations indicate that the predicted hydrodynamic performance shows good conformity with experimental results.
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Gungor, Emre, and Ilyas Bedii Ozdemir. "Design and Analyses of a Propeller for Underwater Vehicles Using Computational Fluid Dynamics." Applied Mechanics and Materials 798 (October 2015): 155–59. http://dx.doi.org/10.4028/www.scientific.net/amm.798.155.
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This paper presents results of computation of a unique propeller design for underwater vehicles using an original in-house algorithm which is developed for the problems of fluid dynamics. Specific software based on finite volume calculations are used to validate design procedure. Conventional propellers having experimental results are good choice to investigate the convenience of solutions. Cavitation tunnel test results of two types of conventional propeller namely P-4382 and P-4119 were considered as a test-case study. The characteristic performances of those were all compared with CFD analysis for different conditions to realize the effects of mesh generation, discretization method and turbulence model in numerical process. Design criteria for unique propeller were selected according to underwater vehicle performance and its requirements. Then the method performed in validation stage was entirely implemented to the new design to observe its performance curves. The results show that this new propeller design is capable of providing desired thrust, vehicle velocity and power output with high efficiency for underwater vehicle. Algorithm implementation, mesh generation, turbulence models and solution methods in CFD process are so suitable that results of analyses are matching with experiments.
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Kovbasenko, Serhii, Andriy Holyk, and Serhii Hutarevych. "RESEARCH OF INDICATORS OF A VEHICLE WITH A DIESEL WORKING ON DIESEL AND DIESEL GAS CYCLES USING THE MATHEMATICAL MODEL." Avtoshliakhovyk Ukrayiny, no. 1 (261)’2020 (March 20, 2020): 14–19. http://dx.doi.org/10.33868/0365-8392-2020-1-261-14-19.
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The features of an advanced mathematical model of motion of a truck with a diesel engine operating on the diesel and diesel gas cycles are presented in the article. As a result of calculations using the mathematical model, a decrease in total mass emissions as a result of carbon monoxide emissions is observed due to a decrease in emissions of nitrogen oxides and emissions of soot in the diesel gas cycle compared to the diesel cycle. The mathematical model of a motion of a truck on a city driving cycle according to GOST 20306-90 allows to study the fuel-economic, environmental and energy indicators of a diesel and diesel gas vehicle. The results of the calculations on the mathematical model will make it possible to conclude on the feasibility of converting diesel vehicles to using compressed natural gas. Object of the study – the fuel-economic, environmental and energy performance diesel engine that runs on dual fuel system using CNG. Purpose of the study – study of changes in fuel, economic, environmental and energy performance of vehicles with diesel engines operating on diesel and diesel gas cycles, according to urban driving cycle modes. Method of the study – calculations on a mathematical model and comparison of results with road tests. Bench and road tests, results of calculations on the mathematical model of motion of a truck with diesel, working on diesel and diesel gas cycles, show the improvement of environmental performance of diesel vehicles during the converting to compressed natural gas in operation. Improvement of environmental performance is obtained mainly through the reduction of soot emissions and nitrogen oxides emissions from diesel gas cycle operations compared to diesel cycle operations. The results of the article can be used to further develop dual fuel system using CNG. Keywords: diesel engine, diesel gas engine, CNG
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Abăităncei, Horia, Sebastian Radu, Bogdan Muntean, Cristi Irimia, Mihail Grovu, and Călin Husar. "Multi-Domain and Durability Analysis of a Hybrid Hydraulic Vehicle." Applied Mechanics and Materials 823 (January 2016): 217–22. http://dx.doi.org/10.4028/www.scientific.net/amm.823.217.
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The intent of this paper is to present a multi-domain and structural study of a hydraulic hybrid machine. The evaluation of different solutions is based on simulation approach, using LMS Imagine.Lab (Amesim) and Ansys Workbench software packages. Amesim provides a 1D simulation suite to model and analyze multi-domain intelligent systems, to predict their multi-disciplinary performance and Ansys Workbench Durability tool performs the high cycle fatigue life calculation. The multi-domain analyses are made for different constructive solutions at different drive ratio. The comprehensive fatigue calculations and results enable engineers to evaluate the main shaft design of the hydraulic motor in order to avoid failures under real world conditions. Some recommendations are made regarding possible solutions.
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Blazquez, Carola A., and Alan P. Vonderohe. "Simple Map-Matching Algorithm Applied to Intelligent Winter Maintenance Vehicle Data." Transportation Research Record: Journal of the Transportation Research Board 1935, no. 1 (January 2005): 68–76. http://dx.doi.org/10.1177/0361198105193500108.
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Intelligent winter maintenance vehicles are equipped with automatic vehicle location (AVL) technology, including differential Global Positioning System (DGPS) receivers and various additional sensors that collect equipment status and material use data. DGPS data points are associated with the nearest roadway centerline by calculating minimum perpendicular distances between each roadway centerline representation and the DGPS data points. Highly accurate roadway centerline maps and DGPS measurements are not always available. Thus, spatial mismatches may occur at converging and diverging roadways, divided highways, and intersections. Decision makers use winter maintenance performance measures to evaluate achievement of goals and objectives and to improve winter maintenance operations in public agencies. These performance measures are sensitive to spatial mismatches, which need to be resolved before calculations are done. This paper presents a simple map-matching algorithm that resolves spatial ambiguities by determining the correct roadway centerline on which the vehicle is traveling. The algorithm computes shortest paths between snapped DGPS data points using network topology and turn restrictions. A path is considered viable, and locations for the snapped DGPS data points correct, if similarity exists between values of calculated and recorded vehicle speeds. If a path is not feasible, DGPS points are snapped to alternative roadway centerlines contained within their buffers, shortest paths are recalculated, and speeds are again compared. Examples are presented to illustrate the implementation and effectiveness of the algorithm.
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Lazarou, Stavros, Vasiliki Vita, Christos Christodoulou, and Lambros Ekonomou. "Calculating Operational Patterns for Electric Vehicle Charging on a Real Distribution Network Based on Renewables’ Production." Energies 11, no. 9 (September 11, 2018): 2400. http://dx.doi.org/10.3390/en11092400.
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The connection of electric vehicles to distribution networks has been an emerging issue of paramount importance for power systems. On one hand, it provides new opportunities for climate change mitigation, if electric energy used for charging is produced from zero emission sources. On the other hand, it stresses networks that are now required to accommodate, in addition to the loads and production from distributed generation they are initially designed for, loads from electric vehicles charging. In order to achieve maximum use of the grid without substantially affecting its performance, these issues have to be addressed in a coordinated manner, which requires adequate knowledge of the system under consideration. It is advantageous that electric vehicle charging can be controlled to a certain degree. This research provides better understanding of real distribution networks’ operation, proposing specific operational points through minimizing electric vehicle charging effects. The probabilistic Monte Carlo method on high performance computers is used for the calculations.
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Händel, Peter, Bo Enstedt, and Martin Ohlsson. "Combating the effect of chassis squat in vehicle performance calculations by accelerometer measurements." Measurement 43, no. 4 (May 2010): 483–88. http://dx.doi.org/10.1016/j.measurement.2009.12.019.
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Li, H. X., A. H. Zhu, C. C. Ma, P. W. Sun, J. W. Yang, and K. Q. Zhang. "Influence of Wheel Profile Wear Coupled with Wheel Diameter Difference on the Dynamic Performance of Subway Vehicles." Shock and Vibration 2021 (June 10, 2021): 1–15. http://dx.doi.org/10.1155/2021/6694561.
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In view of the coexistence of wheel profile wear (WPW) and wheel diameter difference (WDD) on an actual subway line, a dynamic analysis method based on coupling between WPW and equivalent in-phase WDD was proposed. Based on the measurements from a subway vehicle in operation on this line, dynamics modeling and calculations were performed for a single carriage of this vehicle. Later, the interaction between the effects of WPW and equivalent in-phase WDD on the vehicle dynamic performance was analyzed, and the dynamic response in the presence of coupled damage was compared between the outer and inner wheels. Furthermore, the difference in the dynamic response caused by different positions of the larger-diameter wheels (i.e., on the inner track or outer track) was analyzed for the case where equivalent in-phase WDD occurred between the front and rear bogies. The results show that when the vehicle ran on a straight line, the coupling between WPW and WDD reduced the vehicle’s stability but improved its ride comfort. When the vehicle traveled on a curved line, it showed reductions in the lateral wheel/rail contact force, derailment coefficient, axle lateral force, and wear index if the outer wheels had a larger diameter. As a result, the deterioration of the vehicle’s dynamic performance due to the increasing degree of WPW slowed down, and its curve negotiation performance improved. Meanwhile, the outer wheels had significantly greater lateral wheel/rail contact force, derailment coefficient, and wear index compared to the inner wheels. When a −1 mm WDD was coupled with the worn wheel profile for 14 × 104 kilometers traveled, the dynamic performance indexes of the vehicle were close to or even exceeded the corresponding safety limits. The findings can provide technical support for subway vehicle maintenance.
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Małek, Arkadiusz, and Andrzej Marciniak. "The use of deep recurrent neural networks to predict performance of photovoltaic system for charging electric vehicles." Open Engineering 11, no. 1 (January 1, 2021): 377–89. http://dx.doi.org/10.1515/eng-2021-0034.
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Abstract Electric vehicles are fully ecological means of transport only when the electricity required to charge them comes from Renewable Energy Sources (RES). When building a photovoltaic carport, the complex of its functions must consider the power consumption necessary to charge an electric vehicle. The performance of the photovoltaic system depends on the season and on the intensity of the sunlight, which in turn depends on the geographical conditions and the current weather. This means that even a large photovoltaic system is not always able to generate the amount of energy required to charge an electric vehicle. The problem discussed in the article is maximization of the share of renewable energy in the process of charging of electric vehicle batteries. Deep recurrent neural networks (RNN) trained on the past data collected by performance monitoring system can be applied to predict the future performance of the photovoltaic system. The accuracy of the presented forecast is sufficient to manage the process of the distribution of energy produced from renewable energy sources. The purpose of the numerical calculations is to maximize the use of the energy produced by the photovoltaic system for charging electric cars.
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Hong, Z. C., C. C. Lee, and C. J. Tseng. "A Concept of Vertical Takeoff Two-Stage-to-Orbit Reusable Launch Vehicle with an Integral-Rocket-Ramjet Booster." Journal of Mechanics 21, no. 1 (March 2005): 51–56. http://dx.doi.org/10.1017/s172771910000054x.
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AbstractReusable launch vehicles (RLV) currently envisioned incorporate a wide variety of propulsion types. Various propulsion devices have been designed, or are being designed. The Integral-Rocket-Ramjet (IRR) propulsion mainly applies to a tactical missile boost system and few have mentioned this system in RLV design. According to the technological ability of Taiwan and a feasibility study, it shows that the present reusable launch system can exploit the potential benefit of IRR propulsion for the RLV system. A conceptual study of an unmanned two-stage-to-orbit (TSTO) launch vehicle is designed in this paper. The first stage of the vehicle is reusable with IRR engines. The second stage is expendable and rocket powered. The assumed mission is designed to insert a 100kg payload into a low earth circular orbit at various inclination angles. The calculations are made for the case where the TSTO system is used in Taiwan. The fundamentals of launch vehicle design are examined using simplified two-stage performance equations. Launch vehicle design is optimized when the performance and programmatic drivers are balanced. There is an acceptable set of launch and landing sites on islands off the coast of Taiwan.
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Galimov, R. R., K. YU Maksimovich, V. V. Tikhonovskiy, and S. A. Voynash. "Evaluation of the efficiency of transport services for forage harvesters when harvesting maize for silage in Novosibirsk region." Traktory i sel'hozmashiny 1, no. 1 (2021): 73–80. http://dx.doi.org/10.31992/0321-4443-2021-1-73-80.
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An assessment of the efficiency of the enterprise for harvesting corn for silage through position-ing and monitoring of vehicles was carried out. The calculation of the required power of the forage harvester for the smooth operation of service vehicles, that are responsible for the transportation of green mass, was done. An inconsistency was revealed between the departures of loaded vehicles and the arrivals of empty vehicles. The lack of positioning and monitoring tools negatively affects the productivity of the harvesting and transport process. As a result of the research, it was found that the actual performance of the forage harvester when harvesting maize for silage is significantly lower than the theoretical performance. Through experiments, the downtime of forage harvesters in the field due to improper organization of transport services was revealed. When analyzing the state of the park of forage harvesters and vehicles, the requirements of new approaches in solving transport problems were revealed. These contribute to a radical improvement of the transport process when harvesting silage crops. The obtained calculations and patterns of change in technical and technological parameters can be used for the design of new, special agricultural vehicles, as well as in the harvesting and transport process to determine the required number of transport units, when transporting chopped green mass. On the basis of experimental data the regularities of changes in the volume of the vehicle bed on the mass of the trailer and the dependence of the change in the volume of the vehicle bed on the mass of the trailer during transportation of green mass were ob-tained.
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Rowinski, Lech, and Maciej Kaczmarczyk. "Evaluation of Effectiveness of Waterjet Propulsor for a Small Underwater Vehicle." Polish Maritime Research 28, no. 4 (December 1, 2021): 30–41. http://dx.doi.org/10.2478/pomr-2021-0047.
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Abstract The goal of the project described is to replace the existing propulsion system of a small underwater vehicle with a solution less prone to mechanical damage and ensuring a lower risk of the entanglement of fibrous objects suspended in the body of water. Four typical marine screws are utilised in the current design of the vehicle. One possible solution of the problem is the application of waterjet propulsors located inside the body of the vehicle instead. The general condition of the application of the new solution was to secure at least the same motion control capabilities of the vehicle while the basic capability is its propulsion effectiveness at the required speed. Specific features of the considered waterjet propulsor, when compared with their application in surface vessel propulsion, are the lack of the head losses and the low significance of cavitation issues. One of the difficulties in the considered case is the small diameter of the propulsor in comparison to commercially available waterjet units, which have diameters between 0.1 [m] and 1.0 [m]. There is very little data regarding the design and performance of devices in the 0.02 to 0.05 [m] range. Methods utilised to forecast the performance of the new propulsion system are presented and results compared. These were semi-empirical calculations, numerical calculations and tests of real devices. The algorithm that is based on semi-empirical calculations is of particular interest while it offers possibility quick assessment of performance of a propulsor composed of several well defined components. The results indicate the feasibility of modification of the propulsion system for the considered vehicle if all the existing circumstances are taken into account.
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Dorrani, Zohreh, Hassan Farsi, and Sajad Mohamadzadeh. "Deep Learning in Vehicle Detection Using ResUNet-a Architecture." Jordan Journal of Electrical Engineering 8, no. 2 (2022): 165. http://dx.doi.org/10.5455/jjee.204-1638861465.
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Vehicle detection is still a challenge in object detection. Although there are many related research achievements, there is still a room for improvement. In this context, this paper presents a method that utilizes the ResUNet-a architecture – that is characterized by its high accuracy - to extract features for improved vehicle detection performance. Edge detection is used on these features to reduce the number of calculations. The removal of shadows by combining color and contour features - for increased detection accuracy - is one of the advantages of the proposed method and it is a critical step in improving vehicle detection. The obtained results show that the proposed method can detect vehicles with an accuracy of 92.3%. This - in addition to the obtained F-measure and η values of 0.9264 and 0.8854, respectively - clearly state that the proposed method - which is based on deep learning and edge detection - creates a reasonable balance between speed and accuracy.
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Aditya Chavhan, Animesh Hedaoo, Rajat Gode, Ritik Raj Singh, Syed Hamza Ali, and Ganesh Shetiye. "Design and Analysis of Suspension System for an ATV Using LOTUS Software." ARAI Journal of Mobility Technology 2, no. 4 (November 19, 2022): 386–91. http://dx.doi.org/10.37285/ajmt.2.4.6.
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Suspension System is classified as the most important subsystem of a vehicle as its design is responsible for the dynamic performance, comfort and safety level of the vehicle. This paper focuses on designing the suspension system for an ATV and considers its impact on steering geometry. LOTUS Shark Suspension Analysis software has been used as the prime software tool for the designing and simulation process for the suspension and to study its corresponding effects on the steering geometry. The literature also includes the force calculations that are performed during suspension design. It also sheds light on calculations and design aspects of the steering subsystem as well.
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Guo, Binqiang, Renzhi Wang, Chen Lu, Weijian Shi, and Qingfei Gao. "Numerical Investigation on the Dynamic Performance of Steel–Concrete Composite Continuous Rigid Bridges Subjected to Moving Vehicles." Sustainability 13, no. 24 (December 10, 2021): 13666. http://dx.doi.org/10.3390/su132413666.
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Assembly construction is the main feature of industrialized bridges, and π-shaped section steel–concrete composites that are continuously rigid have been widely used in engineering fields in recent years; however, their dynamic responses and corresponding impact coefficients in positive and negative moment regions need to be further studied. First, considering the interface slip model, we established a finite element model for the π-shaped continuous region section of the steel–concrete composite on the Sutai Expressway Tongfu No. 3 viaduct. Second, the bridge deck unevenness parameters were generated by preparing a MATLAB program with random calculations and were added to the bridge deck as the excitation load along with the vehicle load. Such parameters are defined on the basis of considering the vertical degrees of freedom of the four wheels and of one vehicle rigid body. Finally, we analyzed the displacement or stress impact coefficients as the dynamic response index of the bridge by adjusting the vehicle travel speeds, vehicle weights, interface slip stiffness values, and deck unevenness values. The results show that the change in vehicle travel speed and the change in vehicle load weight have some influence on the change in the dynamic effect of the combined beam, but this change is not significant. Moreover, the unevenness and interface slip strength changes have a large effect on the dynamic effect of the combination beam, which can significantly change the impact coefficient of the combination beam bridge. The worse the unevenness of the bridge deck is, the lower the grade of interface slip for the steel–concrete composite bridges and the higher the impact coefficient. We calculated the recommended impact coefficient values of the steel–concrete composite bridge based on the specifications for various countries, and they range from 1.16 to 1.4; such values are similar to the finite element calculation results.
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Dorofeev, R., A. Tumasov, A. Sizov, A. Kocherov, A. Meshkov, and D. Porubov. "Engineering of Light Electric Commercial Vehicle." Science & Technique 19, no. 1 (February 5, 2020): 63–75. http://dx.doi.org/10.21122/2227-1031-2020-19-1-63-75.
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The paper describes the process and results of the development of the light commercial electric vehicle. In order to ensure maximum energy efficiency of the developed vehicle the key parameters of the original electric motor. The article also presents the results of power electronic thermal calculation. For the mathematical model of the vehicle, the driving cycle parameters of the electric platform were determined in accordance with UNECE Regulations No 83, 84. The driving cycle was characterized by four successive urban and suburban cycles. The mathematical model also takes into account the time phases of the cycle, which include idling, vehicle idling, acceleration, constant speed movement, deceleration, etc. The model of the electric part of the vehicle was developed using MatLab-Simulink (SimPowerSystems library) in addition to the mechanical part of the electric car. The electric part included the asynchronous electric motor, the motor control system and the inverter. This model at the output allows to obtain such characteristics of the electric motor as currents, flows and voltages of the stator and rotor in a fixed and rotating coordinate systems, electromagnetic moment, angular speed of rotation of the motor shaft. The developed model allowed to calculate and evaluate the performance parameters of the electric vehicle. Technical solutions of the electric vehicle design were verified by conducting strength calculations. In conclusion, the results of field tests of a commercial electric vehicle are presented.
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Güleryüz, İbrahim Can, and Özgün Başer. "Modelling the longitudinal braking dynamics for heavy-duty vehicles." Proceedings of the Institution of Mechanical Engineers, Part D: Journal of Automobile Engineering 235, no. 10-11 (March 26, 2021): 2802–17. http://dx.doi.org/10.1177/09544070211004508.
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This paper establishes a reliable heavy-duty braking system model that can be used for response time prediction and for vehicle braking calculations regarding the legislative requirements. For the response time prediction, a pneumatic system model of a heavy-duty vehicle is constructed by Matlab Simulink in consideration of service brake layout. To ensure the accuracy of system parameters related with pneumatic system response time experiments are conducted on two different 4 × 4 heavy-duty vehicles. The numerically calculated response time results are validated with experimental data. To improve the response time of the vehicle, design modifications are conducted on the pneumatic brake system properties. To check the compliance of the pneumatic brake system design with legislative requirements of UN Regulation 13, heavy-duty vehicle brake system (HVBS) model is developed by using Matlab Simulink. HVBS model is composed of longitudinal vehicle and wheel dynamics, Magic Formula tyre model, wheel slip and the experimentally verified heavy-duty pneumatic system model. The braking performance analyses are conducted by using HVBS model to compare the design alternatives in accordance with the legal requirements in terms of service braking and secondary braking conditions.
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Zheglov, L. F., and A. B. Fominykh. "Vehicle Vibration Safety Evaluation in the Time Domain." Mechanical Engineering and Computer Science, no. 10 (December 6, 2018): 1–15. http://dx.doi.org/10.24108/1018.0001432.
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The article is a sequel to studies of the nonlinear vibration isolation systems of a vehicle. The first published papers considered an application of the known methods of statistical linearization when determining the vibration safety performance in the frequency domain. The frequency domain is the most adaptive in the context of analysis of the obtained calculation results and evaluation of the initial dynamic system features. Therefore, a problem to determine the adequacy range of such calculations in the frequency and time domain is relevant.The paper deals with the problem of creating a technique to determine and analyze the spectral characteristics of the vehicle vibration isolation system when modeling in the time domain. Considers as an object, a nonlinear dynamic system equivalent to the nonlinear vibration isolation system of a vehicle under its spatial vibrations. In formulating a system of equations-of-motion of the adopted system a module-based method was used. As an example, the power unit is given. Modeling of input random perturbations, provided that the solutions obtained are adequate, is based on the recurrent difference equations. The subsequent transformation of the calculation results into the frequency domain is based on the finite Fourier transforms.To determine the final parameters which characterise the effectiveness of the vibration isolation system, at the first stage of calculations the dynamic system was tested in a linear setting.The vector of natural frequencies of a conservative system defined in the frequency domain was compared with the spectrum of natural frequencies (the frequency response) calculated in the time domain. Besides, the article has carried out a conformity evaluation of the amplitude-frequency characteristics obtained in the frequency and time domain and their determining accuracy. The obtained positive results made it possible to compare and analyze the spectral characteristics of vibration signals and dynamic system in its nonlinear and linearized formulation. The coherence function, the amplitude-frequency characteristic, the spectral density of perturbation and output vibration signal, the vehicle suspension and tyre load characteristics are considered as the analyzed ones. The article compares the output characteristics of the dynamic system under consideration for the case in linear, linearized, and nonlinear formulation of the problem.
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Elsherbiny, Hanaa, Mohamed Kamal Ahmed, and Mahmoud Elwany. "Comparative Evaluation for Torque Control Strategies of Interior Permanent Magnet Synchronous Motor for Electric Vehicles." Periodica Polytechnica Electrical Engineering and Computer Science 65, no. 3 (July 6, 2021): 244–61. http://dx.doi.org/10.3311/ppee.16672.
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This paper presents a detailed analysis and comparative investigation for the torque control techniques of interior permanent magnet synchronous motor (IPMSM) for electric vehicles (EVs). The study involves the field-oriented control (FOC), direct torque control (DTC), and model predictive direct torque control (MPDTC) techniques. The control aims to achieve vehicle requirements that involve maximum torque per ampere (MTPA), minimum torque ripples, maximum efficiency, fast dynamics, and wide speed range. The MTPA is achieved by the direct calculation of reference flux-linkage as a function of commanded torque. The calculation of reference flux-linkage is done online by the solution of a quartic equation. Therefore, it is a more practical solution compared to look-up table methods that depend on machine parameters and require extensive offline calculations in advance. For realistic results, the IPMSM model is built considering iron losses. Besides, the IGBTs and diodes losses (conduction and switching losses) in power inverter are modeled and calculated to estimate properly total system efficiency. In addition, a bidirectional dc-dc boost converter is connected to the battery to improve the overall drive performance and achieve higher efficiency values. Also, instead of the conventional PI controller which suffers from parameter variation, the control scheme includes an adaptive fuzzy logic controller (FLC) to provide better speed tracking performance. It also provides a better robustness against disturbance and uncertainties. Finally, a series of simulation results with detailed analysis are executed for a 60 kW IPMSM. The electric vehicle (EV) parameters are equivalent to Nissan Leaf 2018 electric car.
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Vaddi, Prashanth KR, and Cheruvu S. Kumar. "A non-linear vehicle dynamics model for accurate representation of suspension kinematics." Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science 229, no. 6 (July 8, 2014): 1002–14. http://dx.doi.org/10.1177/0954406214542840.
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A non-linear full vehicle model for simulation of vehicle ride and handling performance is proposed. The model effectively estimates the suspension spring compressions, thus improving the accuracy of normal force calculations. This is achieved by developing models for suspension kinematics, which are then integrated with the commonly used 14 degrees of freedom vehicle dynamics models. This integrated model effectively estimates parameters like camber angles, toe angles and jacking forces, which are capable of significantly affecting the handling performance of the vehicle. The improvements in the accuracy of spring compressions help in simulating the effects of non-linear suspension elements, and the accuracy of handling simulation is enhanced by the improvements in normal force estimates. The model developed in Simulink is validated by comparing the results to that from ADAMS car.
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Kuklina, Irina Gennadevna. "AUTOMATION OF DESIGN PROCESSES WHEN CREATING AND OPERATING SPECIAL CARS." Computational nanotechnology 6, no. 4 (December 30, 2019): 9–17. http://dx.doi.org/10.33693/2313-223x-2019-6-4-9-17.
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The fundamental task of the modern engineer-creator of specialized automotive equipment (the study examines cross- country vehicles and equipment for the construction and maintenance of roads) is a competent and high-performance application of modern information technologies, as noted in the Government Decree of 2014 . The author of the article proposed a structured set of application of object-oriented information methodologies for solving problems of calculation and visualization when creating highly reliable vehicles equipped with long screw rotors . The methodologies of automation and computerization of design processes in calculating the dynamics of a machine (the creation of a competent design of vibration damping in automotive vehicles is one of the most important tasks of car builders) were considered and proposed at the end of the last and the beginning of the modern century by leading foreign and Russian authors [4, p. 53].Snow and swamp vehicles - so often called rotor-screw machines are equipped with long screw rotors [6, p. 23], the use of which significantly increases the cross-country ability of the machine [7, p. 135], but also increases the vibrational loads on the operator and passengers of the all-terrain vehicle. The creation of a methodology for calculating the oscillatory processes of these machines is devoted to the works of famous scientists of Russia . The proposed surveys are devoted to the use of modern information technologies to increase the speed and quality characteristics of calculation processes when creating comfortable and reliable special vehicles with rotary thrusters. Calculation programs are accompanied by video playback of machine units.The article proposes an original object-oriented system for studying dynamic vibration loading of machines with linear contact between the supporting surface and the propulsion. It is the uniqueness of rotor-screw machines that creates difficult conditions for the design engineers of these machines. Automation of complex calculations of the oscillatory system of these machines is an important task for Russian designers.
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Jin, Liang, Xian Yu Wu, Jing Lei, Li Yan, Wei Huang, and Jun Liu. "CFD Analysis of a Hypersonic Vehicle Powered by Triple-Module Scramjets." Applied Mechanics and Materials 390 (August 2013): 71–75. http://dx.doi.org/10.4028/www.scientific.net/amm.390.71.
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A numerical investigation has been carried out to study the longitudinal performance of a hypersonic airbreathing vehicle with highly integrated triple-module scramjets. CFD-Fastran is used to evaluate the aerodynamic performance of the vehicle at inlet-open scramjet unpowered mode, and a chemical reacting code ChemTur3D has been built to evaluate the propulsion performance of the triple-module engines at scramjet powered mode. The flow conditions for the calculations include variations of angle of attack at Mach 5.85 test point. The wall pressure and surface friction are integrated to calculate drag, lift and pitching moment coefficients to predict the combined aeropropulsive force and moment characteristics during engine operation. Finally, numerical results is compared with available ground test data to assess solution accuracy, and a preflight aerodynamic database of the vehicle could be built for the hypersonic flight experiments.
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Kim, Chang Min, and Woon Kyung Baek. "Motion Performance Prediction and Experiments of an Autonomous Underwater Vehicle through Fluid Drag Force Calculations." Journal of the Korean Society of Marine Engineering 39, no. 6 (July 31, 2015): 614–19. http://dx.doi.org/10.5916/jkosme.2015.39.6.614.
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Papadopoulos, Charalampos, Dimitrios Mitridis, and Kyros Yakinthos. "Conceptual Design of a Novel Unmanned Ground Effect Vehicle (UGEV) and Flow Control Integration Study." Drones 6, no. 1 (January 14, 2022): 25. http://dx.doi.org/10.3390/drones6010025.
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In this study, the conceptual design of an unmanned ground effect vehicle (UGEV), based on in-house analytical tools and CFD calculations, followed by flow control studies, is presented. Ground effect vehicles can operate, in a more efficient way, over calm closed seas, taking advantage of the aerodynamic interaction between the ground and the vehicle. The proposed UGEV features a useful payload capacity of 300 kg and a maximum range of 300 km cruising at 100 kt. Regarding the aerodynamic layout, a platform which combines the basic geometry characteristics of the blended wing body (BWB), and box wing (BXW) configurations is introduced. This hybrid layout aims to incorporate the most promising features from both configurations, while it enables the UGEV to operate under adverse flight conditions of the atmospheric boundary layer of the earth. In order to enhance the performance characteristics of the platform, both passive and active flow control techniques are studied and incorporated into the conceptual design phase of the vehicle. For the passive flow control techniques, the adaptation of tubercles and wing fences is evaluated. Regarding the active flow control techniques, a wide range of morphing technologies is investigated based on performance and integration criteria. Finally, stability studies are conducted for the proposed platform.
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Zhou, Qu Zhu. "The Simulation Design of the Rotary Valve of Hydraulic Power Assisted Steering System Based on the VB." Advanced Materials Research 69-70 (May 2009): 641–44. http://dx.doi.org/10.4028/www.scientific.net/amr.69-70.641.
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That automobile steering system are designed to suitable or not have a direct impact on vehicle safety, handling stability and driving comfort.The rotary valve of hydraulic power assisted steering system is one of the key components which affects the automotive steering performance. Design a reasonable spool valve in size can allow the car to get good properties . In this paper we use Visual Basic 6.0 to make a design calculations on rotary valve firstly, and then use the VB to carry out the numerical simulation on the steering performance of rotary valve and fitting the performance curve secondly, This method raised the design precision of the rotary valve, the design calculations is simplified.
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Majka, Andrzej. "The Analysis of the Influence of the Design Parameters on the Performance Characteristics of a Mini UAV." Solid State Phenomena 198 (March 2013): 248–53. http://dx.doi.org/10.4028/www.scientific.net/ssp.198.248.
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In the conditions of the growing intensity of the UAV usage one of the most important problems is the improvement of their technical and performance effectiveness. It can be achieved applying the advanced methods of optimal designing. Apart from constructing an appropriate calculation model of the UAV, such an approach requires separating a group of decisive parameters, determining the limits and choosing the criterion of optimization. The precision and the range of use of the constructed calculation model must be adequate to a particular task allowing the optimal choice of characteristics of an aerial vehicle. Selection of the design parameters requires answering the question which technical parameters (geometrical, constructional etc.) of the UAV influence the performance characteristics of the aircraft positively. Analyzing the gradients of the performance characteristics change depending on the change in the design parameters, it is possible to determine the level of precision when determining the values and formulating the condition of finishing the optimization calculations. The aim of this work was to analyze the influence of selected design parameters on the performance characteristics of a mini UAV.
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Chiou, Juing-Shian, Huu-Khoa Tran, and Shou-Tao Peng. "Design Hybrid Evolutionary PSO Aiding Miniature Aerial Vehicle Controllers." Mathematical Problems in Engineering 2015 (2015): 1–7. http://dx.doi.org/10.1155/2015/684094.
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Based on some sort of simplified fuzzy reasoning methods and PID parameters, many fuzzy-PID controller schemes are applied to control the complicated systems, recently. Mathematical optimization calculations are making in encouraging EP with PSO yielding a higher-quality solution. In this paper, a novel HEPSO algorithm as an improved variant of stochastic optimization strategy PSO, which assigns optimization to fuzzy-PID control gains, is established. The benefit integration design of the HEPSO algorithm structure is generating and updating the new parameters for the fuzzy-PID control schemes in the short setting and operation time. The proposed controllers have demonstrated performance to MAV models.
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Djelamda, Imene, and Ilhem Bochareb. "Field-oriented control based on adaptive neuro-fuzzy inference system for PMSM dedicated to electric vehicle." Bulletin of Electrical Engineering and Informatics 11, no. 4 (August 1, 2022): 1892–901. http://dx.doi.org/10.11591/eei.v11i4.3818.
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Permanent magnet synchronous motor (PMSM) speed control is generally done using flux-oriented control, which uses conventional proportional-integral (PI) current regulators, but still remain the problem of calculating the coefficients of these regulators, particularly in the case of control hybridization, the development of artificial intelligence has simplified many calculations while giving more accurate, and improved results, this paper presents and compares the performance of the flux oriented control (FOC) of a PMSM powered by pulse width modulation (PWM) using PI regulator, fuzzy logic control (FLC) and adaptive neuro-fuzzy inference system (ANFIS), in this work we present another approach of a neuro ANFIS using the hybrid combination of fuzzy logic and neural networks. This ANFIS is a very powerful tool and can be applied to various engineering problems. To make up for the deficiency of fuzzy logic controller. To understand the performance, characteristics, and influence of each controller on the system response, we use MATLAB/Simulink to model a PMSM (0.5 kW) powered by a three-phase inverter and controlled by the FOC, FOC-FLC, and FOC-ANFIS.
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Tomashevskiy, S. B. "Simulation of vehicle tires based on the finite element method." Izvestia MGTU MAMI 1, no. 3 (2020): 65–74. http://dx.doi.org/10.31992/2074-0530-2020-45-3-65-74.
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Modeling of wheeled vehicles is one of the main directions of development and practical appli-cation of software systems based on modeling the dynamics of body systems. In this paper, a tech-nique for analyzing a vehicle tire by the finite element method under various types of loading is considered in order to identify the parameters of its simplified dynamic models. Based on the finite element method, a refined tire model is created. It takes into account the complex geometric shape of various tire parts, their material properties, as well as the contact interaction of the tire with the support. The efficiency of this model was tested, both when performing static calculations of the stress-strain state of the tire from the action of an external load, and when solving the generalized eigenvalue problem. The great influence of external load on the natural frequencies and vibration modes of the tire is confirmed. One of the possible applications of the considered method of finite element modeling of a tire is the performance of refined calculations of the dynamics of wheeled vehicles in the “Universal Mechanism” software package. There are several variants of dynamic tire models that can be used to study the dynamics of off-road wheeled vehicles, including a model based on the method of discrete elements and a model based on the method of coupled substruc-tures. A model based on the method of discrete elements represents a number of absolutely solid bodies-particles, connected to each other and by a wheel disk by a set of elastic-dissipative ele-ments. Each particle of this model has three linear degrees of freedom relative to the wheel disk. The results of calculations of the refined finite element model of the tire are necessary to identify the mass and elastic-dissipative properties of this dynamic tire model. In the model based on the method of connected substructures, the elastic displacements of the tire are represented as the sum of the admissible shapes of the elastic body. Static and natural vibration modes are used as permis-sible forms of an elastic body, calculated using a refined finite element model of the tire.
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Jain, Pranay, Sanjana Kumari, and Shreenivas B. "Framework for Real-Time Monitoring of Battery Performance in Electric Vehicles and Locating Charging Facilities Nearby." International Journal of Engineering and Advanced Technology 10, no. 6 (August 30, 2021): 38–43. http://dx.doi.org/10.35940/ijeat.f2980.0810621.
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Electric vehicles (EVs) are becoming more prevalent in the market. In a world where all vehicles are electric, it will be necessary to provide infrastructure on average highways that is similar to the energy consumption of the automobiles on that highway. As a result, a large transition from one type of energy carrier to electrical energy would be required. In comparison to where we are now, this translates into a significant increase in the carrying capacity of the power grid. Electric vehicles are in increasing demand because they have several advantages over gasoline-powered vehicles. On the other hand, limited battery power stations and a lack of infrastructure giving real-time vehicle performance parameters such as battery efficiency, durability, total distance travelled before being totally depleted, and so on should be considered. As a result, an embedded system is being developed in our project to address the aforementioned restrictions. The suggested research demonstrates all of the mathematical calculations of battery characteristics (including but not limited to battery efficiency and percentage durability), which aids in evaluating real-time batter performance. The system was tested and verified in laboratories using acceptable methodologies. In addition, a mobile application for the end-user is being created to provide information on battery parameters as well as the maximum distance it can travel till full discharge.
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Vorotnikova, O. S., N. A. Maystrenko, and A. G. Levshin. "Unified Model for Calculating Technical Facilities Productivity for Transportation and TransportationTechnological Operations." Agricultural Machinery and Technologies 15, no. 2 (June 23, 2021): 75–80. http://dx.doi.org/10.22314/2073-7599-2021-15-2-75-80.
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Productivity is one of the important performance indicators of transport and transport-technological vehicles. The authors confirmed the necessity to unify this indicator calculations for an extensive range of agricultural goods and extensive works on their movement. (Research purpose) To develop universal interconnected stages of detecting the operational productivity of transport and transport-technological vehicles when performing mechanized work in crop production. (Materials and methods) The values of operational performance were determined based on the analysis of norm-forming factors and statistical processing. A systematic approach was used to identifying individual elements of the cargo transportation cycle. The authors studied each of the methodological approaches and the mathematical tools used to calculate the performance indicators of various technical devices. (Results and discussion) After a step-by-step modeling of transport and transport-technological processes, a unified formula of the target function (optimality criterion) was obtained. Having implemented a more convenient calculation algorithm and having transformed the mathematical apparatus, the authors obtained the vehicle production rates for the transportation of mineral fertilizers to the place of their application. (Conclusions) The authors implemented a detailed mathematical description of the transport and transport-technological process stages. They identified the functional relationships between operational parameters and production and agrolandscape conditions. A universal algorithm was developed making it possible to determine the values of the operational performance for transport and transport-technological vehicles. The authors determined the values of the coefficient enabling the unification and comparison of the algorithm for identifying the production rates for transport and transport-technological work. It was found out that with an increase in the length of transportation from 3 to 54 kilometers, this coefficient increases 3.8 times. This variation was explained by an increase in the purely transport phase of the process.
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Tobing, Aldo Manggaranap Lumban. "EVALUATION OF PARKING SPACES AT THE CLEANERS." CERUCUK 5, no. 2 (November 9, 2021): 135. http://dx.doi.org/10.20527/crc.v5i2.4318.
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Sudimampir market is a complete shopping center in the city of Banjarmasin. Along with its running time, the market sudimampir into a crowded shopping mall visited by people of Banjarmasin and its surroundings for a complete and cost. Most visitors come the shop sudimampir market with a wholesale count.This research was conducted for analyzing the characteristics of the vehicle parked at the location of the study include: accumulation of parking, the average duration of parking, parking volume, the total number of its full vehicle parking ,and right parking corner. Data collection was performed manually during holidays. Based on the survey results, in getting Parking Penatu is often not operating optimally by not using the appropriate SRP SNI and still perform manual calculations in the counter. Performance Laundry Parking can run optimally if SRP SNI and using the angle of 30 °. So it can produce 67 pieces SRP and able to accept 313 units wheeled vehicles 4. With so, parking can operate properly by its function, namely as a parking area in the city center.
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Barcala-Montejano, Miguel A., Ángel A. Rodríguez-Sevillano, Rafael Bardera-Mora, Jaime García-Ramírez, Joaquín de Nova-Trigueros, Iñigo Urcelay-Oca, and Israel Morillas-Castellano. "Smart materials applied in a micro remotely piloted aircraft system with morphing wing." Journal of Intelligent Material Systems and Structures 29, no. 16 (July 5, 2018): 3317–32. http://dx.doi.org/10.1177/1045389x18783893.
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The article presents a research in the field of morphing wings (adaptive wing geometry) developed over a prototype of micro-unmanned air vehicle based on smart materials technology. This morphing wing will optimize the aircraft performance features. Modifying the curvature of the wing, the micro-unmanned air vehicles will adjust its performance in an optimum mode to cruise flight condition as well as in the phases of takeoff and landing. The installation of mechanical elements for control surfaces in small size aircraft means, on some occasions, an extra complexity. In addition, it takes into account an increase in aircraft weight. In this research, the adaptive wing geometry is based on macro-fiber composites, so that its position on the inner surfaces of the wing allows the appropriate modification of the curvature, adapting them to the flight profile. This research will present the conceptual design of the vehicle, computational calculations, experimental results of the wind tunnel testing, validations using non-intrusive techniques (particle image velocimetry) and a theoretical–experimental analysis of the macro-fiber composite effects over the wing. An Arduino board will perform the control parameters of the macro-fiber composite deformation. With these analytical, computational, and experimental results, the most relevant conclusions are presented.
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He, Yongming, Yuting Song, Yulong Pei, Bin Ran, and Jia Kang. "Theoretical Research on Longitudinal Profile Design of Superhighways." Journal of Advanced Transportation 2020 (December 27, 2020): 1–14. http://dx.doi.org/10.1155/2020/6680255.
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To improve driving safety on superhighways, longitudinal profile design parameters of a superhighway are calculated via force analysis while a car is driven on a slope. The calculations consider characteristics of drivers, cars, and roads. According to the vehicle type, design speed, and natural conditions, the maximum longitudinal slope of a superhighway is calculated and compared with those of an ordinary superhighway and high-speed railway. Based on analysis of the vehicle climbing performance, braking performance, and driver visual characteristics, the maximum and minimum slope lengths of a superhighway are calculated. By analyzing the elements of vertical curves, the minimum radius and minimum length of the vertical curves of a superhighway are calculated by considering factors such as mitigating the impact at the slope bottom, driving at night, and driving time along vertical curves. Analysis and calculation results show that when the maximum longitudinal slope is 2.50%, 2.25%, and 2.00%, the minimum slope length is 450 m, 400 m, and 350 m, respectively, and the minimum vertical curve length is 145 m, 130 m, and 115 m, respectively, and the superhighway travel requirements can be satisfied at speeds of 180 km/h, 160 km/h, and 140 km/h, respectively.
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Lapina, L. G., I. Yu Malysheva, and T. F. Mokrii. "Study of the possibility of using disturbances formed from recorded track irregularities in the calculation of high-speed rail vehicle dynamics." Technical mechanics 2022, no. 2 (June 30, 2022): 115–22. http://dx.doi.org/10.15407/itm2022.02.115.
Full textAbstract:
An urgent task for Ukraine during the post-war reconstruction of the country will be the upgrade of the entire railway transportation system, in particular the development of high-speed passenger traffic. The prediction of the dynamic performance of high-speed rail vehicles calls for the formation of new input arrays (track-induced disturbances) that would account for more stringent track geometry requirements. The aim of this work is to study the possibility of using track irregularities recorded in real sections of the Ukrainian railways to construct the components of track-induced disturbances acting on a rail vehicle moving at a high speed. This paper considers in detail standard specifications for the geometric parameters of a track suitable for high-speed traffic. The data are contained in the Standard DSTU EN 13848-5:2018, which is a European standard adopted in Ukraine as a national one by confirmation. Using the track subsidence and alignment irregularities recorded by a track measurement car in a number of sections of the Pryndiprovska railway during a scheduled track inspection, processes of actual vertical and horizontal irregularities were formed. The quality of those sections had not require any speed limitation. Irregularity parameters for those sections were calculated. A comparison between the calculated parameters and those specified by the DSTU EN 13848-5:2018 showed that among the sections considered there exist ones that meet the track geometry requirements and allow speeds at least up to 230 km/h. The use of the irregularities in the selected track sections as disturbance components in calculations was tested by the example of determining the ride performance of a standard passenger car with KVZ-TsNII-M trucks. The calculated results showed the possibility of using the generated disturbances in numerical calculations of the dynamic performance of rail vehicles at increased speeds and at the same time confirmed the need for new engineering solutions on the design of rail vehicles capable of operating at such speeds.
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Kao, B. G. "A Three-Dimensional Dynamic Tire Model for Vehicle Dynamic Simulations." Tire Science and Technology 28, no. 2 (April 1, 2000): 72–95. http://dx.doi.org/10.2346/1.2135995.
Full textAbstract:
Abstract Traditional multibody dynamic (MBD) tire models concentrate on the tire patch force development and the tire in-plane characteristics. The tire lateral dynamics and nonlinear effects caused by the tire compliances during rough terrain driving and severe maneuvers are mostly neglected in vehicle analytical simulations. The tire finite element models, though capable of dealing with these phenomena, are basically not designed for quick vehicle dynamic evaluations. A simple three-dimensional (3-D) MBD tire model for full vehicle performance and maneuvering simulations over various road surfaces is therefore desirable for the ever expanding analysis capabilities and the improved accuracy of the computer-aided vehicle design analysis. In this paper a tire modeling concept to extend the in-plane dynamic tire model to full 3-D tire dynamics is proposed. Essentially, this tire model divides the traditional tire/wheel system model into three elements: two rigid bodies representing the wheel mass/inertia and the tire tread mass/inertia, and a spring/damper representing the sidewall visco-elasticity. Thus, 6 degrees-of-freedom (DOFs) are added for each tire over traditional tire models. Using any existing tire patch force calculation model, this proposed model can be used to simulate full 3-D dynamic responses of a vehicle. To implement this model, techniques to extract the nonlinear spring rates of the sidewalls and to enhance the tire patch force calculations over uneven terrains are explained in this paper. Results of the vehicle simulation using this tire model were compared with measured field data. They showed that this tire modeling concept yields a practical representation for tire 3-D nonlinear dynamic characteristics.