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1
Day, Andrew J., Hon Ping Ho, Khalid Hussain, and A. Johnstone. "Brake system simulation to predict brake pedal feel in a passenger car." SAE International, 2009. http://hdl.handle.net/10454/3737.
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NoBraking system characteristics, brake system performance and brake system component design parameters that influence brake pedal `feel¿ in a passenger car have been studied using the simulation modelling package AMESim, in particular to model the linear and nonlinear characteristics of internal components. A passenger car hydraulic brake system simulation model incorporating the brake pedal, booster, master cylinder, brake lines and calipers has been developed to predict brake system response to assist in the design of braking systems with the desired brake pedal force / travel characteristic characteristics to create good brake pedal `feel¿. This has highlighted the importance of system components, in particular the master cylinder and caliper seal deformation, and the operating characteristics of the booster in determining the brake pedal force / travel characteristic. The potential contribution of these 3 components to brake pedal `feel¿ improvement has been investigated, and the results of the AMESim model have been verified using experimental measurement data. The model can be used in the future to provide an accurate prediction of brake system response at the design stage thereby saving time and cost.
2
Štylárek, Milan. "Konstrukce brzdového systému formule Student." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2014. http://www.nusl.cz/ntk/nusl-231480.
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Objective of this thesis is design of brake system of new car Formula Student class – Dragon 3. This car was built by students of faculty of mechanical engineering on Brno university of technology. Brake parts selection is described as well as designing hydraulic brake line circuits optimized for stable braking behavior on tracks of Formula Student competitions. One of main parts of this thesis is design of front and rear custom brake discs with related parts. These parts are FEM analyzed. In the end the whole brake system fitted on Dragon 3 car is tested on track and its performance is analyzed too.
3
Ramaratham, Srivatsan. "A mathematical model for air brake systems in the presence of leaks." Texas A&M University, 2008. http://hdl.handle.net/1969.1/86043.
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This thesis deals with the development of a mathematical model for an air brake
system in the presence of leaks. Brake systems in trucks are crucial for ensuring
the safety of vehicles and passengers on the roadways. Most trucks in the US are
equipped with S-cam drum brake systems and they are sensitive to maintenance.
Brake defects such as leaks are a major cause of accidents involving trucks. Leaks in
the air brake systems affect braking performance drastically by decreasing the peak
braking pressures attained and also increasing the time required to attain the same,
thereby resulting in longer stopping distances. Hence there is a need for detecting
leaks in an air brake system.
In this thesis, a mathematical model for an air brake system in the presence of
leaks is developed with a view towards developing an automatic leak detection system
in the near future. The model developed here builds on an earlier research at Texas
A&M University in which a "fault free" model of an air brake system is developed,
i.e., a mathematical model of an air brake system that predicts how the pressure in
the brake chamber evolves as a function of the brake pedal input when there are no
leaks in the air brake system.In order to develop a model for an air brake system in
the presence of leaks, one must characterize a "leak". A leak may be characterized by
the location and its size. Since the pipes are short, the location of the leak does not significantly affect the evolution in the brake pressure as much as its size. For this
reason, "effective area" of the leak was chosen as a characteristic of the leak. It was
estimated by fitting an empirical relation for leak with leak flow measurement data.
The supply pressure and effective area of leak comprised the inputs to the model
along with the displacement of the foot pedal (treadle valve plunger). The model was
corroborated with the experimental data collected using the setup at Texas A&M
University.
4
Pilčík, Adam. "Pedálová skupina formulového vozidla." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2011. http://www.nusl.cz/ntk/nusl-229838.
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This thesis draws up a basic overview of the current groups pedal cars. It focuses on creating a computer model of the pedal group with the help of the mathematical model and simulation stress of individual components and proposed relief.
5
Kees, Markus. "Intelligent automotive braking system." Thesis, Coventry University, 2002. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.247240.
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Thuppal, Vedanta Srivatsan, and Naga Vamsi Krishna Kora. "HEAT TRANSIENT TRANSFER ANALYSIS OF BRAKE DISC /PAD SYSTEM." Thesis, Blekinge Tekniska Högskola, Institutionen för maskinteknik, 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:bth-13461.
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Braking is mainly controlled by the engine. Friction between a pair of pads and a rotating disc converts the kinetic energy of the vehicle into heat. High temperatures can be reached in the system which can be detrimental for both, components and passenger safety. Numerical techniques help simulate load cases and compute the temperatures field in brake disc and brake pads. The present work implements a Finite Element (FE) toolbox in Matlab/Simulink able to simulate different braking manoeuvres used for brake dimensioning mainly in the early phase of car development process. The brake pad/disc geometry is considered as an axisymmetric body assuming negligible temperature gradient along the circumference of the disc. Calibration using three control factors namely: heat coefficient during braking , acceleration and emissivity for the implemented thermal model is performed using experimental investigation at Volvo Car Corporation (VCC) for three specific severe load cases. The thermal model is extended to measure brake fluid temperatures to ensure no vaporisation occurs. Simulation results of the brake disc and brake pad show good correlation with the experimental tests. A sensitivity analysis with the control factors showed convective coefficient during acceleration the most sensitive, with temperature change of around 16%.
7
Kortán, Daniel. "Analýza brzdění vozidla s nestandardním zásahem do brzdové soustavy." Master's thesis, Vysoké učení technické v Brně. Ústav soudního inženýrství, 2017. http://www.nusl.cz/ntk/nusl-367510.
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This master’s thesis focused on the issue of the possible conversion of liquid brake systems, in the form of replacement of wheel brakes. The first part focused on the function and description of the construction of different types of brakes. The second part is focused on description the types of brake system testing and the regulations regarding brake systems. The last part focused on the measurement of both vehicles and comparison of the results with the calculations.
8
Khan, Yusaf A. (Yusaf Amin). "Analytic dynamic models of brake apply system and components." Thesis, Massachusetts Institute of Technology, 1991. http://hdl.handle.net/1721.1/13265.
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9
Okyay, Ahmet. "Sliding Mode Control Algorithm Development For Anti-lock Brake System." Master's thesis, METU, 2011. http://etd.lib.metu.edu.tr/upload/12613568/index.pdf.
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In this thesis, a sliding mode controller employing a new sliding surface for
antilock brake system (ABS) is proposed, its stability is proven formally and its
performance is compared with existing sliding mode controllers. The new sliding
mode controller uses the integral-derivative surface, which includes error, its
derivative and its integral, all at the same time. This and the already existing
derivative surface, which includes error and its derivative only, are named zerothorder
sliding surfaces. Their stability analysis is done using first-order auxiliary
surfaces. Auxiliary surfaces equal the sliding surfaces when derivative of the error
becomes zero. The first-order error surface, which includes only the error, and the
integral surface, which includes error and its integral, were also designed for
comparison. During design, tire brake force response is modelled as an
uncertainty. Controllers are simulated on a road with an abrupt change in road
coefficient of adhesion. Controller parameters used are optimized, which results in
comparable stopping distances while braking on a constant coefficient of adhesion
road. Effect of first order actuator dynamics with varying time constants and
actuator absolute time delay were considered. Reaching and sliding properties of
controllers were also investigated, using results on a constant coefficient of
adhesion road. It is observed that zeroth-order sliding surfaces give smoother
response for both derivative and integral-derivative cases. As the controllers
employing error and derivative surfaces get unstable in the presence of actuator
time delay, the integral-derivative surface, proposed in this study, stands as the
best controller.
10
Athari, Hazhir. "FRICTION MATERIAL DOWNSCALING AND ITS EFFECT ON BRAKE SYSTEM PERFORMANCE." OpenSIUC, 2017. https://opensiuc.lib.siu.edu/theses/2183.
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Coefficient of friction is considered to be a system property. Unlike physical properties of a material, coefficient of friction is dependent on an entire system. Surface roughness, wear rate, temperature and velocity are some of the factors that influence the COF in a brake system. Due to these factors, current testing strategies fail to make an accurate prediction about the performance of a brake system in smaller scale. This paper explores how a small-scale tester correlates to a full scale dynamometer test when proper scaling strategies are utilized. Series of tests are carried out on non-asbestos organic, semi metallic and low steel using the Bruker’s Universal Mechanical Tester (UMT) TriboLab. Results are then compared to the Greening full-scale dual ended brake dynamometer (Horiba) using AK master standard procedure. Area based Scaling laws are applied as the approach to scale down the conditions of the full- scale dyno test for UMT test. As friction is a system property, dynamometer and UMT tests showed different results. However, performance (COF) for these tests between UMT and Dyno has the same general trend. Therefore, with more repetition on different friction material, it is possible to make more relevant and accurate predictions of performance.
11
Fumi, Duncan University of Ballarat. "An In-Vehicle Data Acquisition System to Monitor the Service Conditions of Brake Systems." University of Ballarat, 2008. http://archimedes.ballarat.edu.au:8080/vital/access/HandleResolver/1959.17/12808.
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The design of vehicle brake systems involves optimising a large number of competing parameters. In order to find an appropriate balance of properties, it is important to have a good picture of the range of operating conditions the system will operate under. Obtaining such information for a large range of driving conditions requires recording data over a long period from a number of vehicles under a number of different driving conditions. In this thesis, a proposed data acquisition system has been designed, constructed and implemented to measure and store in real-time performance related parameters of brake systems. The system proposed in this thesis to monitor brake performance employs a small embedded PC system along with a number of peripheral cards as its basis [...]Masters
12
Fumi, Duncan. "An In-Vehicle data acquisition system to monitor the service conditions of brake systems." Thesis, University of Ballarat, 2008. http://researchonline.federation.edu.au/vital/access/HandleResolver/1959.17/43411.
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The design of vehicle brake systems involves optimising a large number of competing parameters. In order to find an appropriate balance of properties, it is important to have a good picture of the range of operating conditions the system will operate under. Obtaining such information for a large range of driving conditions requires recording data over a long period from a number of vehicles under a number of different driving conditions. In this thesis, a proposed data acquisition system has been designed, constructed and implemented to measure and store in real-time performance related parameters of brake systems. The system proposed in this thesis to monitor brake performance employs a small embedded PC system along with a number of peripheral cards as its basis [...]
13
Fumi, Duncan. "An In-Vehicle Data Acquisition System to Monitor the Service Conditions of Brake Systems." University of Ballarat, 2008. http://archimedes.ballarat.edu.au:8080/vital/access/HandleResolver/1959.17/15675.
Full textAbstract:
The design of vehicle brake systems involves optimising a large number of competing parameters. In order to find an appropriate balance of properties, it is important to have a good picture of the range of operating conditions the system will operate under. Obtaining such information for a large range of driving conditions requires recording data over a long period from a number of vehicles under a number of different driving conditions. In this thesis, a proposed data acquisition system has been designed, constructed and implemented to measure and store in real-time performance related parameters of brake systems. The system proposed in this thesis to monitor brake performance employs a small embedded PC system along with a number of peripheral cards as its basis [...]Masters
14
Zavadil, Martin. "Přestavba brzdového systému vozidla." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2018. http://www.nusl.cz/ntk/nusl-378636.
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This diploma thesis is focused on conversion of Skoda Octavia RS mark I brake system. This vehicle will be used for race use. The aim of the thesis is to design adequate components of the brake system to achieve good brake deceleration and so that the design will be correspond to hard conditions on the race track. Thesis contains complete design of hydraulic system including control and brake forces, pressures, options of brake forces management and evaluate of brake stability. Followed by the design of brake caliper adapters and the static structural analysis by FEM. The thesis contains picture and assembly drawing attachment too.
15
Coimbatore, Subramanian Shankar. "Modeling the pneumatic subsystem of a S-cam air brake system." [College Station, Tex. : Texas A&M University, 2004. http://hdl.handle.net/1969.1/328.
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Thesis (M.S.)--Texas A&M University, 2003."Major Subject: Mechanical Engineering" Title from author supplied metadata (record created on Jul. 18, 2005.) Vita. Abstract. Includes bibliographical references.
16
Motl, Jakub. "Vliv okamžité hmotnosti vozidel na jejich brzdnou dráhu." Master's thesis, Vysoké učení technické v Brně. Ústav soudního inženýrství, 2010. http://www.nusl.cz/ntk/nusl-232480.
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This diploma thesis is engaged in analysis of braking process of vehicles, especially heavy utility vehicles, with regard to their instantaneous weight. This thesis features survey and division of braking systems and function of brakes including schemes and descriptions. Also there is introduce of some systems improving vehicle properties. Furthermore this work puts mind to possibilities of examination of brakes, measurement of braking distance and braking retardation namely in brake test rooms or by outdoor driving tests including descriptions of particular methods and equipment. There is also mention about legislative requirements for braking distance and braking retardation. The conclusion of this thesis compares numerically predicted braking distance and real braking distance measured for factual vehicle during outdoor driving test
17
Firdaus, Alfi Hadi. "System-wide LCC Calculation for Novel Brake Block Material in Nordic Condition." Thesis, KTH, MWL Marcus Wallenberg Laboratoriet, 2018. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-247504.
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One of the main issues of cast-iron block brake material is high noise. Nowadays, train operators tend to change the brake block material from cast-iron to composite material. However, composite block brake materials are likely to produce more wear than cast-iron block brakes, degrading the dynamic behavior of the vehicle on the track. Therefore, comparison of the dynamic behavior and the maintenance cost of each block brake material of the train has been performed. The dynamic behavior is analyzed using GENSYS software and the maintenance cost analysis is done by using the Universal Cost Model developed in the EU project Roll2Rail. The iron ore train that operates in Malmbanan has been used as the simulation model. One-wheel profile before changing the block brake material before 2010 and two-wheel profiles after changing the block brake material after 2010 have been used for simulation. Certain radii, cant, vehicle speeds and wheel-rail friction coefficients has been taken into consideration in the simulations. After that, the wheel and track maintenance costs have been taken into consideration for analyzing the Universal Cost Model. The simulation results show that the wheel profiles after changing the block brake material possess higher risk of RCF than wheel profile before changing the brake block material. The UCM calculation show that the wheel profile after changing brake material leads to higher track maintenance costs, 9.3% higher for new1 and 2.8% higher for new2 wheel profiles, compared to the worn wheel profile before changing brake material. Moreover, The UCM calculation show that the wheel profile after changing brake material leads to higher wheel maintenance costs, 1.04% higher for new1 and 4.3% higher for new2 wheel profiles, compared to the worn wheel profile before changing brake material. The total of maintenance cost also shows that the wheel profile after changing brake material leads to higher maintenance costs, around 2-4%, compared to the worn profile before changing brake material.
18
Olsson, Martin, and Walter Låstberg. "Development of an analytical model of the safety brake system for a chainsaw." Thesis, Högskolan i Skövde, Institutionen för ingenjörsvetenskap, 2018. http://urn.kb.se/resolve?urn=urn:nbn:se:his:diva-16059.
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The safety braking system with the hand guard is the most important safety equipment for the user of a chainsaw. The safety system prevents serious injuries caused by a kickback. A kickback is when the running chain suddenly gets stuck e.g. by getting stuck in wood or hit a rock. Due to the potentially serious consequences of a kickback, the braking system has to fulfil strict requirements formulated by the authorities. In the present thesis, a generic analytical model of the braking system for a typical Husqvarna chainsaw is developed. The model is implemented as an Excel work sheet, which will facilitate future projects. The thesis includes sections of analytical calculations with information provided from both Catia and resources at Husqvarna. Several experiments were accomplished to strengthen and prove the analysis. The torque, index and activation force are tested. The static activation force is then completed in a simulation program to provide spread in the model. The parameters with most impact are also detected in the Excel simulation. A matrix of testing is constructed with parameters outside the tolerances for the dynamic experiment. Due to the collected data of the test, the relation between the two types of activation can be established. In comparison between samples of production with the simulation on equal numbers of 24 tests gave adifference on 4.75 % in mean value. 6 out of 32 tests could not be approved within the authorities’requirements for the acceleration with respect to the higher tolerances than production in the testing matrix. The most significant parameters for the static force were the brake spring and the angle of the knee joint. For the dynamic activation, the dimensions of the knee joint is crucial. Reasoning for errors are implemented in the discussion section e.g. the importance of data for the band. To improve the accuracy of the model a section of future work contains suggestments. One suggestion for improvement is to deliver more production values to ensure the comprehension of the experiments.
19
Sen, Osman Taha. "Dynamic Analysis of Speed-Dependent Friction-Induced Torque in a Nonlinear Brake System." The Ohio State University, 2012. http://rave.ohiolink.edu/etdc/view?acc_num=osu1339172357.
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Moody, David. "Application Pressure for an Electronic Brake System : Estimation and Implementation of a Recursive Filter." Thesis, Uppsala University, Department of Information Technology, 2009. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-111173.
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Scania CV AB is one of the major heavy truck manufacturers in the world. Many of their trucks use a brake system that is electronic where the driver demands retardation and the brake power is generated pneumatically. The objective of this thesis is to re-search if it is possible to determine the pressure at which the brakes start giving a retard-ing force, the application pressure, for the Electronic Brake System (EBS) and if a pre-dictive estimation of the application pressure can be implemented.
Three different ways of determining the application pressure are presented in the thesis and a signal processing method where the mean of pre-braking acceleration is used for change detection gives the most reliable results. This method is then implemented in a recursive filter where a predictive estimation of the application pressure is developed. Due to the lack of precision in the signals the estimation does not give a result that can be used and until this is solved by Scania it is difficult to see how a good way of pre-dicting the application pressure can be developed.
21
Ahuja, Nitesh Raju P. K. "Some studies on modeling and simulation of a disc brake system for squeal prediction." Auburn, Ala., 2006. http://repo.lib.auburn.edu/2006%20Summer/Theses/AHUJA_NITESH_54.pdf.
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Khan, Aamir Khusru. "Design and Implementation of a Clutch and Brake System for a Single Wheel Indoor Tire Testing Rig." Thesis, Virginia Tech, 2017. http://hdl.handle.net/10919/79965.
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The primary goal of this work is to design and implement a clutch and brake system on the single tire Terramechanics rig of Advanced Vehicle Dynamics Laboratory (AVDL) at Virginia Tech. This test rig was designed and built to study the performance of tires in off-road conditions on surfaces such as soil, sand, and ice. Understanding the braking performance of tires is crucial, especially for terrains like ice, which has a low coefficient of friction. Also, rolling resistance is one of the important aspects affecting the tractive performance of a vehicle and its fuel consumption. Investigating these experimentally will help improve tire models performance. The current configuration of the test rig does not have braking and free rolling capabilities. This study involves modifications on the rig to enable free rolling testing when the clutch is disengaged and to allow braking when the clutch is engaged and the brake applied. The first part of this work involves the design and fabrication of a clutch system that would not require major changes in the setup of the test rig; this includes selecting the appropriate clutch that would meet the torque requirement, the size that would fit in the space available, and the capability to be remotely operated. The test rig's carriage has to be modified in order to fit a pneumatic clutch, its adapter, a new transmission shaft, and the mounting frame for the clutch system. The components of the actuation system consisting of pneumatic lines, the pressure regulator, valves, etc., have to be installed. Easy operation of the clutch from a remote location is enabled through the installation of a solenoid valve. The second part of this work is to design, fabricate, and install a braking system. The main task is to design a customized braking system that satisfies the various physical and functional constraints of the current configuration of the Terramechanics rig. Some other tasks are the design and fabrication of a customized rotor, selection of a suitable caliper, and design and fabrication of a customized mounting bracket for the caliper. A hydraulic actuation system is selected since it is suitable for this configuration and enables remote operation of the brakes. Finally, the rig is upgraded with the assembly of these two systems onto it.Master of Science
23
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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Balvedi, Alessandro Mattiuzi. "A study of squeal noise in a disc brake system and influence of rubber coated shims on system damping." Florianópolis, SC, 2002. http://repositorio.ufsc.br/xmlui/handle/123456789/82542.
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Tese (doutorado) - Universidade Federal de Santa Catarina, Centro Tecnológico. Programa de Pós-Graduação em Engenharia Mecânica.Made available in DSpace on 2012-10-19T16:01:03Z (GMT). No. of bitstreams: 0Bitstream added on 2014-09-26T02:06:08Z : No. of bitstreams: 1 192285.pdf: 101649091 bytes, checksum: b90362d343d41980bde2a0e107057422 (MD5)
Ruído de alta freqüência (acima de 2000 Hz) em sistemas de freios tem recebido grande atenção por parte da indústria automobilística. Este tipo de ruído, também conhecido como "squeal", é percebido pelos usuários como um problema no sistema de freios. Esta percepção afeta de modo substancial não só índices de qualidade e satisfação, mas principalmente os custos relacionados à garantia e assistência técnica. O ruído de alta freqüência em sistemas de freios é resultado do acoplamento de dois modos de vibração dos componentes do freio, tais como disco, pastilha e pinça. Entre as técnicas utilizadas para o controle deste tipo de ruído, o aumento do amortecimento modal tem-se mostrado uma solução eficiente. O método mais comumente utilizado para aumentar-se o amortecimento modal do sistema tem sido a utilização de materiais multicamadas, também conhecidos como "shims", colados na parte anterior das pastilhas de freio. A configuração destes "shims" consiste de um ou mais materiais viscoelásticos (polímeros) restringidos entre duas camadas metálicas, usualmente aço. Em algumas configurações, uma camada viscoelástica, geralmente borracha sintética, é aplicada sobre a face externa destas camadas metálicas, com o objetivo de melhorar ainda mais as características de amortecimento do sistema. Estas configurações, com material viscoelástico na face externa do "shim", tem-se mostrado útil no controle de ruído de alta freqüência em alguns casos, sendo, porém, aplicadas sem sucesso em outros. O objetivo principal desta pesquisa é investigar a influência de tais configurações no amortecimento modal introduzido pelos materiais multicamadas. Para isto, a compreensão do mecanismo de geração do ruído de alta freqüência torna-se necessária. Neste trabalho, primeiramente, o mecanismo de amortecimento de materiais viscoelásticos é descrito. Em materiais multicamadas, este mecanismo é dependente, além dos parâmetros geométricos da configuração, da presença ou não de uma camada metálica restringindo o material viscoelástico. As medições das propriedades dinâmicas dos materiais viscoelásticos utilizados nesta pesquisa são também apresentadas.
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Pecina, Miroslav. "Brzdová soustava vozidla Formule Student." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2018. http://www.nusl.cz/ntk/nusl-378503.
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Design of braking system for the formula student car. Calculation of basic forces acting in the braking system. Mechanical analysis of the most important parts of the braking system. Manufacturing of brake pedal. Assembly brake components to brake system.
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Lu, Ziwei, and Tao Liu. "Design and implementation of brake and steering control functions for an over-actuated vehicle platform." Thesis, KTH, Fordonsdynamik, 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-299361.
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This thesis project is a comprehensive practice to improve a research concept vehicle in both hardware and software aspects. The hardware of the friction brake system is improved to have higher stability and accuracy. The brake force distribution function is implemented to optimize the brake control system. A fault tolerant function based on the Pseudo-inverse control allocation strategy is designed, implemented, and tested to compensate for sudden fault in wheels when driving.Detta examensarbete är ett omfattande arbete att förbättra ett forskningsfordon som heter Research Concept Vehicle (RCV) gällande både hårdvara och mjukvara. Hårdvaran i bromssystemet har förbättrats för bättre stabilitet och noggranhet. Bromskraftsfördelningsfuktionen har implementerats för att optimera bromssystemets reglering. En feltolerant funktion baserad på pseudo-invers reglering har också implementerats och testats för att kunna kompensera plötsliga felfall i hjul under körning.
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Downing, Dirk Johannes. "Development of a novel active muzzle brake for an artillery weapon system / Dirk Johannes Downing." Thesis, Potchefstroom University for Christian Higher Education, 2002. http://hdl.handle.net/10394/9715.
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A conventional muzzle brake is a baffle device located at some distance in front of the muzzle
exit of a gun. The purpose of a muzzle brake is to alleviate the force on the weapon platform by
diverting a portion of the muzzle gas resulting in a forward impulse being exerted on the recoiling
parts of the weapon. A very efficient muzzle brake unfortunately gives rise to an excessive
overpressure in the crew environment due to the deflection of the emerging shock waves.
The novel active muzzle brake of this dissertation is based on a concept developed by Qinetiq.
The novel technique involves the main brake chamber being closed for a very short period of time
after the projectile has uncorked from the barrel eliminating the main emerging shock wave from
developing to full strength with the result that the novel muzzle brake gives rise to a very low
overpressure. This has the advantage that the gun crew suffers from less strain to the ears and
vulnerable organs. Inherently the novel brake suffers a loss in efficiency due to the chamber being
closed for a while and a method had to be developed to improve the efficiency of the
conventional part.
This dissertation deals with the development of a novel active muzzle brake intended for a 155
mm artillery weapon, but scaled to an 88 mm 25 pounder G 1 as an interim phase. Several
constraints and requirements have been set regarding the physical properties and performance
criteria of the prototypes. The interim phase of the project was executed within three years in
which six prototypes were developed and evaluated. Major challenges in the development were to
design a control and restoring mechanism that would survive the harsh conditions at muzzle exit
and to enhance the efficiency. The establishment of linear movement of the closure mechanism
and friction springs as the restoring mechanism was a major breakthrough in this respect. The
first four prototypes were designed using empirical data and first order modeling as background
while a CFD technique was used to refine the last two prototypes.
Of the six prototypes developed, the first two were unsuccessful in demonstrating the novel
technique. The one was unable to survive the muzzle exit conditions and the control mechanism
on the second muzzle brake opened too soon. Of the remaining four, the last prototype passed all
the specified constraints and proved to be a candidate for the 155mm upgrade. Not only was the
structure robust enough, the general appearance of the novel muzzle brake is futuristic. This
prototype is also a candidate if a much more efficient muzzle brake, with similar overpressure
characteristics of a less efficient muzzle brake, is needed.MIng (Mechanical Engineering), Potchefstroom University for Christian Higher Education, 2003
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Ashby, Ryan Michael. "Hardware in the Loop Simulation of a Heavy Truck Braking System and Vehicle Control System Design." The Ohio State University, 2013. http://rave.ohiolink.edu/etdc/view?acc_num=osu1366046155.
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Ho, Hon Ping. "The Influence of Braking System Component Design Parameters on Pedal Force and Displacement Characteristics. Simulation of a passenger car brake system, focusing on the prediction of brake pedal force and displacement based on the system components and their design characteristics." Thesis, University of Bradford, 2009. http://hdl.handle.net/10454/7447.
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This thesis presents an investigation of braking system characteristics, brake system performance and brake system component design parameters that influence brake pedal force / displacement characteristics as ‘felt’ by the driver in a passenger car. It includes detailed studies of individual brake system component design parameters, operation, and the linear and nonlinear characteristics of internal components through experimental study and simulation modelling. The prediction of brake pedal ‘feel’ in brake system simulation has been achieved using the simulation modelling package AMESim. Each individual brake system component was modelled individually before combining them into the whole brake system in order to identify the parameters and the internal components characteristics that influence the brake pedal ‘feel’. The simulation predictions were validated by experimentally measured data and demonstrated the accuracy of simulation modelling. Axisymmetric Finite Element Analysis (using the ABAQUS software) was used to predict the behaviour of nonlinear elastomeric internal components such as the piston seal and the booster reaction disc which was then included in the AMESim simulation model. The seal model FEA highlighted the effects of master cylinder and caliper seal deformation on the brake pedal ‘feel’. The characteristics of the brake booster reaction disc were predicted by the FEA and AMESim simulation modelling and these results highlighted the importance of the nonlinear material characteristics, and their potential contribution to brake pedal ‘feel’ improvement. A full brake system simulation model was designed, prepared, and used to predict brake system performance and to design a system with better brake pedal ‘feel’. Each of the brake system component design parameters was validated to ensure that the braking system performance was accurately predicted. The critical parameter of brake booster air valve spring stiffness was identified to improve the brake ‘pedal ‘feel’. This research has contributed to the advancement of automotive engineering by providing a method for brake system engineers to design a braking system with improved pedal ‘feel’. The simulation model can be used in the future to provide an accurate prediction of brake system performance at the design stage thereby saving time and cost.
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Vladimirov, Oleg. "Lengvojo automobilio su hidrauline stabdžių sistema stabdymo proceso parametrų tyrimas." Doctoral thesis, Lithuanian Academic Libraries Network (LABT), 2005. http://vddb.library.lt/obj/LT-eLABa-0001:E.02~2005~D_20051209_102017-67452.
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Emergency braking of a vehicle is bound with many factors, such as the behaviour of the driver, the drive of the vehicle braking system, the braking mechanisms, the condition of the tyres, and the properties of the pavement. This process involves all parameters of the system “the driver – the vehicle – the road”. In order to investigate the efficiency of braking process upon specific conditions, it is necessary to examine all physical processes that take place in the vehicle on pressing the brake pedal.
Upon the completion of the experimental and theoretical investigation on emergency braking of vehicles a general mathematical model of vehicle with hydraulic braking system on its emergency braking had been developed. The dynamic, thermodynamic in solid systems and fluid hydrodynamic processes were assessed. The model enables to examine various cases of emergency braking with assessment of the driver’s reaction, parameters of the vehicle’ technical condition and the pavement condition.
A general mathematical model of vehicle with hydraulic braking system that’s computing is realized in the system of the applied software Compaq Visual Fortran Professional system provides possibilities for research the hydrodynamic processes that take place in the system of braking; enables to define more closely the movement parameters of the vehicle in the emergency braking mode and may be applied for analysis of traffic events, improvement of vehicle braking systems as well as a manual for... [to full text]
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Ait-Hammouda, Islam. "Modélisation hybride des algorithmes d'anti-blocage des roues (ABS)." Paris 11, 2007. http://www.theses.fr/2007PA112075.
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Dans cette thèse on s'intéresse au problème du contrôle longitudinal des véhicules, plus particulièrement aux algorithmes d'anti-blocage des roues -ABS-. L'objectif est de modéliser et d'étudier une catégorie de systèmes anti-blocage de roues proche de celles utilisées dans l'industrie -basée sur les seuils de décélération-. D'abord, à partir de l'analyse des trajectoires du système, on proposera des conditions sur les seuils de décélération qui optimisent le freinage du véhicule. Ensuite, on s'intéressera à l'impact d'une discontinuité de l'adhérence pneu/sol sur la dynamique du système, un algorithme ABS qui prenne en charge ce type de phénomènes est proposé et étudié. Il nous sera aussi utile pour analyser, sous forme de simulations, l'impact des variations de charge sur les performances des algorithmes ABS. L'interaction des systèmes de sécurité offre de nos jours de nouvelles opportunités pour augmenter performances du véhicule et améliorer le confort du conducteur. Ceci nous a poussé à étudier l'interaction entre les algorithmes ABS des quatre roues. Des solutions à des problèmes tel que : les remontées d'efforts au volant, le manque de conditions satisfaisantes à l'estimation de la vitesse véhicule (garantir au moins une roue dans la zone stable du pneumatique), sont proposées. La dernière partie de cette thèse est consacrée au suivi de trajectoire d'un véhicule avec point de visée. Des lois de commande par retours d'états statiques en l'erreur et de type saturation emboîtée sont proposées. L'objectif de cette partie étant d'introduire l'étude d'un modèle conducteur, qui nous sera utile à l'analyse des performances des algorithmes ABSIn this thesis we were interested on the problem of longitudinal control of vehicles, and more particularly on anti-lock brake algorithms or ABS. The main objective is to model and to study a category of anti-lock brake systems similar to those used in industry (based on deceleration thresholds). Starting from the analysis of the system's trajectories, we will propose conditions on the deceleration thresholds that optimize the braking force of the vehicle. Then, we will be interested in the impact of discontinuous transitions of road characteristics on the system's dynamic. An ABS algorithm that deals with this type of phenomena is proposed and studied. It will be also useful to analyze, using simulations, the impact of vertical force variation on the ABS algorithms performances. Nowadays, The safety systems interaction offers new advisabilities to increase vehicle performances and to improve the driver's comfort. This pushed us to study the interaction between the ABS algorithms of the four wheels. Some solutions that deal with problems such as: the increase of efforts at the wheel, the lack of satisfactory conditions to the estimate the vehicle's speed (to guarantee at least one wheel in the stable zone of the tire), are proposed. The last part of this thesis is devoted to the trajectory following of a vehicle with point of vision. Feedback static controllers (Saturation Type) are proposed. The objective of this part being to introduce the study of a driver model, which will be useful for the analysis of the of the performances of ABS algorithms performances
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Liette, Jared. "A coupled, multi-physics model of the automotive brake system with focus on dynamic torque prediction." Connect to resource, 2009. http://hdl.handle.net/1811/44506.
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Noble, Valerie G. "A human factors systems approach to exploring vehicle rollaway." Thesis, Loughborough University, 2018. https://dspace.lboro.ac.uk/2134/33518.
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Failure of a parked unattended vehicle to remain stationary, otherwise known as vehicle rollaway, can result in property damage, injury or even fatality. Although the incidence of vehicle rollaway may be under reported, around 8% of drivers and 13% of Approved Driving Instructors surveyed indicated they had experienced a vehicle rollaway event. Unlike previous studies which focused only on the mechanical factors that may contribute to this phenomenon, the research presented in this thesis employed a more comprehensive, systems approach to explore additional factors related to the driver s interaction with the parking brake system at various interface levels. A mixed methods strategy collated data through two online surveys and three observational studies to explore the organisational, mechanical and driver related factors identified in a fault tree framework. The results indicated that current driver practice and interaction with the parking brake system may be contrary to legislative requirements and manufacturer s instruction. The findings suggested that a past experience of vehicle rollaway or parking brake system failure, had a statistically significant influence on whether the driver complied with the recommended practice. Driver interaction and the holding capability of the parking brake system were observed in 53 vehicles parked on three test gradients. The observations indicated that drivers were able to apply sufficient force to the parking brake lever to hold the vehicle stationary and that an additional degree of confidence in the system was provided by parking in gear. But, after driving a short commuting route, when the vehicle was parked with the parking brake lever applied to the lowest position to hold the vehicle and a gear was not selected, 63% of vehicles fitted with disc brakes rolled as the temperature returned to ambient. Discussion relates to the organisational, driver related and mechanical components of the parking brake system and in reference to Reason s Swiss Cheese model, considers how latent failures within the defensive layers of the system can contribute to rollaway. The research findings contributed to a change in UK driving standards and since 2015, drivers are recommended to park in gear at all times to reduce the risk of rollaway. This recommendation is likely to require a change in practice for up to 80% of Approved Driving Instructors who would not normally instruct new drivers in this way. Although this research focused on the manually operated parking brake system, the studies have uncovered results that can contribute to knowledge and are applicable to interaction with electronic parking brake systems. As parking brake systems develop, the Human Factors systems approach can be applied retrospectively and proactively to explore that interaction and prevent passenger vehicle rollaway.
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Hanselowski, Andreas [Verfasser]. "A Fuzzy Arithmetical Approach to Finite Element Model Updating Applied to an Automotive Brake System / Andreas Hanselowski." Aachen : Shaker, 2017. http://d-nb.info/1139583344/34.
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Tadros, Alfred Heikal. "Control system design for a three degree of freedom virtual environment simulator using motor/brake pair actuators." Thesis, Massachusetts Institute of Technology, 1990. http://hdl.handle.net/1721.1/13972.
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Böhlander, Marcus. "Design and Safety Analysis ofEmergency Brake System forAutonomous Formula Car : In Reference to Functional Safety ISO 26262." Thesis, KTH, Fordonsdynamik, 2018. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-243285.
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The engineering competition Formula Student has introduced a Driverless Vehicle (DV)class, which requires the students to develop a car that can autonomously make its wayaround a cone track. To ensure the safety of such a vehicle, an Emergency Brake System(EBS) is required. The EBS shall ensure transition to safe state for detection of a singlefailure mode. This thesis work covers the design of the EBS for KTH Formula Student(KTH FS).Due to the safety critical character of this system, the software part of the EBS, calledEBS Supervisor, has been analyzed in accordance with the safety standard ISO 26262 tosee if an improved safety could be achieved. The analysis has been perform according toPart 3: Concept phase of ISO 26262 with an item definition, Hazard Analysis and RiskAssessment (HARA), Functional Safety Concept (FSC) and Technical Safety Concept(TSC).The result of the analysis showed that the EBS Supervisor requires extensive redundanciesin order to follow ISO 26262. This includes an additional CPU as well as signal checksof inputs and outputs. Due to limited resources in terms of money and time within theKTH FS team, these redundancies will not be implemented. The process of working withthe safety standard did however inspire an increased safety mindset.Ingenjörstävlingen Formula Student har introducerat en förarlös tävlingsklass (eng:Driverless Vehicle) som innebär att studenterna ska utveckla en bil som autonomt kan tasig runt en konbana. För att försäkra sig om säkerheten för ett sådant fordon krävs ettnödbromssystem (eng: Emergency Brake System (EBS)). EBS:en skall försäkra att enövergång till ett säkert tillstånd sker då ett singulärt fel upptäcks. Det här examensarbetetbehandlar designen av EBS:en för KTH Formula Student.På grund av den säkerhetskritiska karaktären hos detta system har mjukvarudelen avEBS:en, kallad EBS Supervisor, blivit analyserad utifrån säkerhetsstandarden ISO 26262för att se om en förbättrad säkerhet kunde uppnås. Analysen har blivit genomfördenligt Del 3: Konceptfas av ISO 26262 med item definition, Hazard Analysis and RiskAssessment, Functional Safety Concept och Technical Safety Concept.Resultatet av analysen visade att EBS Supervisor kräver omfattande redundanser föratt uppfylla ISO 26262. Detta inkluderar en extra CPU såväl som kontroller av inochutsignaler. På grund av begränsade resurser i form av pengar och tid inom KTHFS, valdes dessa redundanser att inte implementeras. Processen av att arbeta medsäkerhetsstandarden har dock inspirerat ett ökat säkerhetstänk.
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WU, CHONG-WEI, and 巫崇瑋. "The Investigation of Brake System Brake-to-Stop for Various Brake Disks." Thesis, 2016. http://ndltd.ncl.edu.tw/handle/52968756589811202870.
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碩士南臺科技大學
機械工程系
104
The brake system plays an very important role in the vehicle configuration. Designing a complete brake system can ensure the safety of driver and passengers. When vehicle runs on road and if an abrupt and unexpected situation occurs, and an emergency brake is necessary, whether the brake system of the vehicle performs well in a normal function is the most fundamental requirement of driving safety. This study is mainly focused to allow the general public to understand that the different type of commercially disks used in the brake system will lead to various corresponding brake performance. By utilizing a road testing way, the influence of brake disc on the brake performance is explored in case that the related parameters including vehicle speed and ABS normal ABS fail are considered. According to the obtained results from the tests, there are evident differences in vehicle deceleration during emergency brake among the completely-planar, hole-drilled, and groove-scribed discs. It is found that the tires are easily locked obviously during emergency at vehicle speeds ranged from 30 to 70km / h and in ABS fail condition. There is no wheel lock phenomenon for hole-drilled disc at any vehicle speed and in both ABS normal and ABS fail conditions. In ABS fail condition, the wheel lock will occur at speeds ranged from 30 to 70 km/h for groove-scribed disc.Wheel lock phenomenon doesn’t appear on the contrary. In this study, it is shown that under the same testing conditions, in ABS normal condition, the brake-to-stop time is the shortest for the completely-planar disc, next is hole-drilled disc, and groove-scribed disc in sequence. Although, the variation of brake interval among the three discs is 0.2-0.5 second during emergency brake, in which the value is considerably small, it is quite important in some special emergent cases.
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Falcão, da Luz Luís. "Design of a magnetorheological brake system." 2004. http://hdl.handle.net/1828/755.
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mengzhe and 莊孟哲. "A study of pedal travel and brake pressure control for brake by wire system." Thesis, 2008. http://ndltd.ncl.edu.tw/handle/19939403856841509973.
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碩士大葉大學
機電自動化研究所碩士班
96
In this study,the self-assembled SBC brake by wire system is used to connect with pressure stability control system and a vehicle model is built for the experimental car in CAMSIM RT. In the part of the controller,we use the vehicle model of CARSIM as a control object and via Simulink build a controller to control the four-wheel pressure.Then we can find the best membership functions of the fuzzy controller by using the genetic algorithm(GA).In this experiment,the first thing is to build the structure of pressure controller with CARSIM.After developing the pressure controller,it is connected to CARSIM RT and SBC braking system for doing the Hardware in the Loop(HIL) simulation to verify the stability of the pressure controller. In the HIL experiment,we first measure the environment data by CARSIM RT and after that we use it to generate the braking control signals.Through CAN BUS,these signals are sent to the SBC brake by wire system.After controlling the pressure by the SBC brake by wire system,the pressure signals are sent back to CARSIM RT by CAN BUS.Then we can use these data to analyze the influence of braking pressure of the car.
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JHANG, TENG-YUE, and 張騰躍. "Study of Brake System for Light Electric Vehicles." Thesis, 2015. http://ndltd.ncl.edu.tw/handle/43622844435253902716.
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碩士大葉大學
機械與自動化工程學系
103
Under the pressure of highly environmental consciousness and energy crisis, electric vehicle will be the trend of next generation. In order to increase the of human safety and electric vehicle, the improvement of brake system will be needed. This research took advantage of one set of brake caliper to be innovative brake caliper with backup brake system. There are three main functions of this system. Firstly, it can be the replacement when original brake system is malfunctioned. Secondly, it can be assisted to recover brake force when it is not enough. Thirdly, it can secure human life when brake system is inactive. Using the CarSim software to simulate the performance of the innovated system. Finally, the hardware-in-the-loop is used to verify the characteristics of the innovated brake system.
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JHANG, TENG-YUE, and 張騰躍. "Study of Brake System for Light Electric Vehicles." Thesis, 2016. http://ndltd.ncl.edu.tw/handle/74358131728244695028.
Full textAbstract:
碩士大葉大學
機械與自動化工程學系
104
Under the pressure of highly environmental consciousness and energy crisis, electric vehicle will be the trend of next generation. In order to increase the of human safety and electric vehicle, the improvement of brake system will be needed. This research took advantage of one set of brake caliper to be innovative brake caliper with backup brake system. There are three main functions of this system. Firstly, it can be the replacement when original brake system is malfunctioned. Secondly, it can be assisted to recover brake force when it is not enough. Thirdly, it can secure human life when brake system is inactive. Using the CarSim software to simulate the performance of the innovated system. Finally, the hardware-in-the-loop is used to verify the characteristics of the innovated brake system
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Wu, Chiung-Lun, and 吳瓊倫. "A Study for Safety Brake System on Bicycles." Thesis, 2002. http://ndltd.ncl.edu.tw/handle/97161451227966306921.
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碩士國立交通大學
機械工程系
90
The brake system of a bicycle composes of brake levers, braking units and cable casing that used for an inter-medium. On the viewpoint of brake system design, to improve the compatibility of brake lever and braking unit will enhance the performance of safety and controllability on the bicycle. In convenience, when some conditions happen to the riders, it will effect safety to the riders, if they only action the front or rear brake. However, when front and rear brakes match each other or simultaneously, the brake bicycle will not be out of control, and it will improve riding safety. Therefore, it is a major problem that design should improve the performance of the braking system. In this field, engineering design will be proposed. The engineering design procedure is based on patents search and analysis, which will accomplish both better mechanical advantage and operating system of stroke efficiency. However, the main purpose of the project is to understand each mechanical characteristic and constraint.
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Hong, Sh-Chau, and 洪士超. "The Fuzzy Control of Anti-lock Brake System." Thesis, 1997. http://ndltd.ncl.edu.tw/handle/47016927703654514049.
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碩士大葉工學院
機械工程研究所
85
Due to the efficiency problem of the mechanical anti-lock bra-king system (ABS) for motorcycle, this thesis aims to study the electrical-control ABS. Wecompare two kind of ABS for experiment,and design the fuzzy controllers respe-ctively for them. In simulation, we develop the mathematical models of the vehicle dynamics, braking force and hydraulic system dynamics. We find out the relationship of friction force and slip in order to design the fuzzy controller with slip as the reference input. Also, we design the fuzzy controller that its input isthe angular velocity and acceleration of the wheels. Matlab is utilized to si-mulate dy-namics of ABS to provide some reference for the design of the actualcontroller. In experiment, we design the test platform to test and understand the func-tion of anti-lock brake system. In the platform, we can mea-sure the desired experiment data. Further, we can adjust the controller parameters to improve the ABS operation. It is certified that the developed fuzzy controller has achieved its desired result by experiment result.
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Hung, Chiu-Ling, and 洪秋伶. "Research on Brake System for All Terrain Vehicles." Thesis, 2007. http://ndltd.ncl.edu.tw/handle/55699458134011286798.
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碩士國立交通大學
理學院碩士在職專班應用科技學程
95
This study focuses on the product design of an all terrain vehicle’s (ATV’s) brake system. A complete product design procedure from market survey, quality function development (QFD) method and mechanical design is provided. In this thesis, the QFD method is used for the product development. QFD is used to transform the customer’s requirements to the measurable engineering requirements, compare the available products, and determine the design target. Techniques of patent search and analysis are applied for creation new concepts of brake system, and the database for innovative design is constructed simultaneously. The patentability of new concept is also evaluated and examined for further submission of new patents.
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Lin, Jhih Fong, and 林志峯. "Dynamic analysis of the brake system of bicycle." Thesis, 2008. http://ndltd.ncl.edu.tw/handle/67220905180857726352.
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碩士長庚大學
機械工程研究所
96
This research contains two parts; one is the development of a simulator of brake system to simulate the dynamic responses of a bicycle according to user’s braking behavior, and the other is the analysis of the baking efficiency and the safety of the bicycle. For the simulator, a mathematical model is built in the software, which is calculated by 4-th Runge-Kutta method, to simulate the motion and reaction forces of bicycle. The software is based on the platform of Labview as an interface to integrate with the hardware, where C-langrage is embedded for the numerical simulation. The hardware consists of two load cells, data acquisition system, and a brake system. Through the virtual-reality vision of the simulator, the real-time interaction of the user with the system can be implemented. Furthermore, the influences of the parameters (including the brake forces of the front and rear wheels, the height of the center of mass, the friction coefficients of the brake system..) on the braking efficiency (the braking distance and time) and the safety are analyzed. If the braking forces are large, a large deceleration will be induced to decrease the braking distance and time, but also to reduce the normal force of the rear wheel, even to lift the rear wheel. When the deceleration is too large, a flipping over could take place to cause the unsafety of the rider. Therefore, it is tradeoff to increase the braking forces of the front and rear wheels for raising both the braking efficiency and the unsafety. Using the simulator, we can simulate and analyze the dynamic responses of a real braking process of a moving bicycle with a rider. Different strategies of the front and rear braking are compared, according to their braking efficiencies and safeties. Moreover, a skill of “stoppie” can be performed by this simulator by controlling the front and rear braking processes properly.
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Marques, José Diogo Sena Luz Da Cruz. "Additive Manufacturing of a Vehicle Brake System Component." Master's thesis, 2021. http://hdl.handle.net/10400.8/5538.
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The present project aims to study the applicability of additive manufacturing (AM) in the automotive industry, namely, the applicability of AM in car parts production.
A commercial vehicle can be described as a set of systems, all integrated and communicating each other, with a common goal, move you from point A to point B as secure as possible. The present study focused on the manufacture by AM of a part from one of the systems integrated in the vehicle, namely a brake calliper, component of the brake system. The Selective Laser Melting (SLM) was the AM process that was used to manufacture the part.
It is important to understand that nowadays, a great level of evolution is occurring in the automotive industry. Some new technology had its origins in the racing world. Race teams lead by the big manufacturing car companies have the know-how and the opportunities to try and develop new technologies. This leads to a development in manufacturing processes associated with new components and materials. After some perfecting, the components and manufacturing techniques used in the racing industry find its way into the commercial vehicle market, leading to the endless flow of innovation that we see nowadays.
The component selected to be developed and furthermore manufactured using AM was a brake calliper, part of the braking system of a racing vehicle. The new SLM produced brake callipers will be used in the Formula Student racing platform.
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Chen, Le-hung, and 陳樂紘. "Design of Anti-fail Brake System for Vehicles." Thesis, 2012. http://ndltd.ncl.edu.tw/handle/24368705050104701412.
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碩士大葉大學
機械與自動化工程學系
100
The rapid development of technology industries vehicle, it is very important to road safety, if you are related to the safety of the driver directly upward trend by the brake system, therefore, the study of brake systems, the has improved relative importance. In this study, simulation test platform in order to establish the vehicle brakes, with the aim to explore the mutual recognition and intelligent control and braking systems. Using the design principles of a dynamic braking system simulation test platform for the production of a single wheel brake, a form of action plans, processes, and real-time window target for establishing a data collection software MATLAB / Simulink commercial use of, capture the NI data acquisition as well as data from additional key components of hardware circuitry and can be completed by comparison of experimental data on the actual platform, take a card from the data. Redundant braking systems , brake, the second set and its dynamic response to the ever-changing so that you can quickly adjust the brake pressure, the feasibility of the controller and the control law, in order to confirm it. FMVSS105 regulations related to the issue of more brakes, braking distance and vehicle speed estimation based on the table, and more.
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Li, Xian-Wen, and 李獻文. "Analysis and Design of Electro-Mechanical Brake System." Thesis, 2008. http://ndltd.ncl.edu.tw/handle/4m5vs8.
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碩士國立臺北科技大學
機電整合研究所
96
The Brake-by-Wire system is more weight reduction, easy installation, and quick response than the traditional hydraulic brake system. The developed Brake-by-Wire systems include electronic hydraulic brake system (EHB) which hydraulic system is electronic controlled and electronic mechanical brake system (EMB) fully electronic controlled. This project aims at the mechanism design of EMB. First, the design requirements of EMB can be defined in terms of the analysis of academic data. The structure analysis and design of EMB will be executed based on the collection and deduction of patent data. Then, the mathematical models of power source and transmission mechanism are used to analyze the EMB system’s kinematic motion and static force. In addition, using the computer aid program with the Pro/Engineer Wildfire 2.0 to build up the 3D model; while the Mechanism instruction of Pro/Assembly is applied to simulate the movements of subject electro-mechanical brake in order to ensure no interferes are involved or occurred. Furthermore, ANSYS 11.0 is used to analyze stress and stain, so as to confirm the intensity of the electro-mechanical brake designed.
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Hsieh, Cheng-Chang, and 謝正昌. "Vibration Analysis and Squeal Prediction for the Brake System." Thesis, 2008. http://ndltd.ncl.edu.tw/handle/70882622932948492867.
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碩士國立臺灣大學
工程科學及海洋工程學研究所
96
The purpose of this study is to analyze the unstable modes in linear conditions for the brake system and to provide the method for determining the stability characteristics of the brake system assembly. When the motion of brake system is unstable, it is the likelihood of brake squeal. The brake squeal typically occurs at unstable resonant frequencies of brake system. Finite element methods are used to derive the equations of motion for the brake system of motorcycle. The components of brake system are coupled together in the system model including the friction coupling terms between the pad and disc. The proposed friction coupling formulation produces an asymmetric stiffness matrix. This mechanism (varying force) provides necessary for energy to be fed into the vibrating system that will excite the unstable modes of the system. To study the stability of the system by the complex eigenvalue method, the friction effects between the pad and the disc are accounted for by introducing linear elements in an asymmetric stiffness matrix. The application of modal analysis in the finite element friction coupling model of the brake system is used to identify its complex eigenvalues and to relate them to the squeal occurrence. The positive real parts of complex eigenvalues reveal which modes are unstable and tend to generate the brake squeal. The image parts of complex eigenvalues is the frequency of the brake squeal. This analysis can be a predictive tool to squeal. An attempt is made to investigate the effect of the operational parameters (friction coefficient, brake pressure, proportional damping and the stiffness of each component for brake system) and the modification of pad shape on the brake squeal. The simulation results show that a pair of modes merges at the critical value of the operational parameters, i.e., their frequencies and mode shapes become identical. This merging state defines the modal coupling phenomenon and it may be the mechanism of brake squeal. Brake squeal can be reduced by decreasing the friction coefficient and brake pressure. The effect of modifying pad shape on the squeal is also obvious. However, increasing the damping have good results for eliminating brake squeal.
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Mao, Yen-Chieh, and 毛彥傑. "Research on the Hydraulic Disc Brake System for Bicycles." Thesis, 2003. http://ndltd.ncl.edu.tw/handle/89093950661205120314.
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博士國立交通大學
機械工程系
92
A common problem on a current bicycle hydraulic disc brake system is that the unwanted friction may occur during free running if the lining pad does not depart away from the disc rotor. This friction may induce vibration, noise, power consumption, higher operating temperature and the braking force reduction. Another problem is that the improper braking force by the rider may induce slippage between the tire and road surfaces in the circumstances of inferior road surface conditions. This slippage may lead to chassis spin, yaw and increase the stopping distance. Aimed at these problems, this study collects relevant literatures, theoretically acquaints their operating principles and inducts possible research directions. By utilizing these remarks, this study proposes two solutions for brake systems by utilizing the methodology of creative design. The first solution is a caliper piston retractor that focuses on the lining pad departure from the disc rotor, reducing the drag force during non-braking mode. The second solution is a hydraulic pressure regulator that can modulate the pressure in the caliper, preventing the excessive pressure in the master cylinder applied by the rider from entering the caliper. This regulation can result in a reduced possibility of tire slippage on the road surface and intensify the effectiveness of stopping the vehicle if cooperating with a suitable control algorithm. The design, manufacturing and assembly processes of a bicycle brake system test rig are accomplished in another phase of this study to examine these apparatus performances. The retracting stroke of the piston retractor is achieved and pre-definable for designers or manufacturers by modifying the design parameters in the evaluative production stage. Therefore, designers can provide users a maintenance-free usage of this product after the product marketing stage. This stroke adjustment characteristic helps users to reduce the possibility of brake performance variations when inferior tuning. The pressure regulator can reduce the hydraulic pressure in the caliper via a solenoid-controlled fluid passage. Compared with current automobile or motorcycle hydraulic pressure regulators, the proposed design provides lower operating frequency, yet it is small in size, economical in electric power consumption and light in weight. This regulator can be equipped on a lightweight motorcycle or bicycle with proper control algorithms. Finally, the proposed brake system test rig is verified with experiment results. The test rig is also utilized to examine the performances of the piston retractor and the hydraulic pressure regulator. Their experiment results show that the new designs can solve the problems and achieve their aims, respectively, on the bicycles for the hydraulic disc brake system.