Dissertations / Theses: 'Brakes'

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Stephens, Arthur William, and arthur stephens esb ie. "Aerodynamic Cooling of Automotive Disc Brakes." RMIT University. Aerospace, Mechanical and Manufacturing Engineering, 2006. http://adt.lib.rmit.edu.au/adt/public/adt-VIT20070108.121737.

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Sufficient heat dissipation is crucial to the effective operation of friction based braking systems. Such cooling is generally provided by ensuring a sufficient supply of cooling air to the heated components, hence the aerodynamics in the region of the brake components is extremely important. The objective of the research was to develop an understanding of how aerodynamics could be used to improve the cooling of automotive disc brakes. Two separate sets of wind tunnel experiments were developed. Tests were performed on a vented disc (rotor) to measure the internal flow through the vents on a rotating vented disc under various conditions, including an isolated disc in still air, the disc in still air with the wheel on, the disc in moving air with the wheel on, and an on-road simulation using a ¼ car. On vehicle tests were also performed in a wind tunnel using a purpose built brake test rig. These tests measured the thermal performance of different brake discs under various operating parameters; including constant load braking, and cooling from high temperature under various speeds, wheels and disc types. It was found that airflow through vented rotors was significantly reduced during simulated on-road driving, compared to when measured in isolation, but not particularly affected by the vehicles speed. In the situations tested, vented discs offered a 40+% improvement in cooling over an equivalent sized solid rotors. However the research indicates that the greatest benefit of vented rotors over solid will be in vehicles where air entering the wheel cavity is limited, such as low drag vehicles. It was also found that the most significant improvements in brake thermal performance could be achieved by maximising the airflow into the region of the brake components; including increasing the open area of the wheel, and increasing the vehicle velocity. Other improvements can be achieved by using a wheel material with good conductive capability, and increasing the mass of the disc. Evidence of vortex shedding was also discovered in the airflow at the exit of an internal vented rotor, any reduction in this flow disturbance should lead to increased airflow with associated improvements in thermal performance.

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Duffour, Philippe. "Noise generation in vehicle brakes." Thesis, University of Cambridge, 2003. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.619769.

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Oliver-Hall, Richard. "Friction characteristics of skewed roller brakes." Thesis, Cranfield University, 1998. http://dspace.lib.cranfield.ac.uk/handle/1826/9118.

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The project sponsors design and manufacture skewed roller brake devices for use in aircraft flight control actuation systems. Design tools have previously been developed to predict the torque characteristics ofthese devices. A fundamental deficiency ofthese tools is the use ofempirical friction coefficient data gathered from a limited test sample. A need was identified to develop a friction coefficient model based on the operational parameters ofthe design, namely load, speed and lubricant viscosity. The development and validation ofthis model formed the basis ofthe technical research objective. A cost benefit analysis indicated that the sponsors could reasonably expect to gain a significant technical competitive advantage over their competitors ifthe technical research objective could be achieved. This advantage should provide opportunities for premium pricing ofthe product and enhanced opportunities to enter new markets. Additionally, the sponsors could expect lead time reductions and cost savings of £69000 from the removal ofthe need to conduct prototype tests to assess the effective friction coefficient. A friction coefficient model and skewed roller torque equation design tool have been successfully developed, satisfying the technical research objective. The friction coefficient model is defined in terms of lubrication number. The lubrication number parameter incorporates lubricant viscosity, roller speed, roller load and contact surface roughness terms, fully describing the operational parameters ofa design. Experimental evidence has validated the model using two lubricants, a hydraulic fluid, Brayco 795 and a mineral oil, Catenex 79. The tests cover a lubrication number range from 2 x 10-5 to 6 X 10-2 with a mean Hertzian stress from 0.27 to 0.61 Gpa. The success ofthis project has ensured that the sponsors will reap the cost and design lead time savings predicted in the cost benefit analysis and have the tools necessary to develop new markets and premium pricing business opportunities.

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Merrow, Kathleen. "Nietzsche's "woman" : a metaphor without brakes." PDXScholar, 1990. https://pdxscholar.library.pdx.edu/open_access_etds/4099.

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This thesis reconsiders the generally held view that Friedrich Nietzsche's works are misogynist. In doing so it provides an interpretation of Nietzsche's texts with respect to the metaphor "woman," sets this interpretation into an historical context of Nietzsche reception and follows the extension of Nietzsche's metaphor "woman" into French feminist theory. It provides an interpretation that shows that a misogynist reading of Nietzsche is in error because such a reading fails to consider the multiple perspectives that operate in Nietzsche's texts.

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Kienhöfer, Frank Werner. "Heavy vehicle wheel slip control." Thesis, University of Cambridge, 2011. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.609594.

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Dzirasa, Mawuli. "Experimental investigation of dither control for the suppression of automotive brake squeal." Thesis, Georgia Institute of Technology, 2002. http://hdl.handle.net/1853/17604.

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Pulugundla, Gautam. "CFD design analysis of ventilated disc brakes." Thesis, Cranfield University, 2008. http://dspace.lib.cranfield.ac.uk/handle/1826/6578.

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This thesis reports the numerical investigation of the automotive ventilated disc brake rotor. Disc brakes operate on the principle of friction by converting kinetic energy into heat energy. The main objective of a disc brake rotor is to store this heat energy and dissipate it as soon as possible. This work is carried out in a area where there is very limited understanding. Commercial CFD code FLUENT was used for carrying out the simulations with the rotor rotating in still air. Only one passage and blade were simulated as all the rotor passages were identical. Uniform temperatures were used on the rotor to simulate the braking condition. Sixteen different blade angle sets were simulated and the range of blade angles having the best aero-thermal performance were identified using mass flow rate, rate of heat dissipation and temperature uniformity as performance metrics. The effect of rotational speed and rotor temperature (corresponding to various braking conditions) on the aero-thermal performance was evaluated. The rotor speed and temperature were observed to have significant effect on the rotor performance. The number of blades in the ventilated disc brake rotor was also varied and was observed to have an impact on the aero-thermal performance of the disc brake rotor. Detailed design changes like inlet chamfer, blade leading edge rounding, and variable thickness blade and passage aspect ratio were incorporated. All these changes did have an effect on the aero-thermal performance of the disc brake rotor. The inlet chamfer and the leading edge rounding improved both the rate of heat transfer and the temperature uniformity. The variable thickness blade and the lower aspect ratio passage improved the temperature uniformity of the rotor.

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Koetniyon, Saiprasit. "Thermal stress analysis of automotive disc brakes." Thesis, University of Leeds, 2000. http://etheses.whiterose.ac.uk/2938/.

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A brake disc rotor forms pan of a foundation brake and rotates with the wheel hub assembly. The main function of a foundation brake is to generate a retarding torque by converting mechanical energy to thermal energy by virtue of the frictional work done in relative sliding at the rotor-pad interface. In practice, most brake discs arc made from cast iron and in use arc sometimes subjected to high thermal stresses which can lead to permanent plastic deformation and occasionally rotor cracking. The aim of the present work is to investigate the thermal response of such a cast iron brake disc using the finite element (FE) method. One particular existing brake disc design for a medium passenger car was chosen for the investigation. This is a "back-vented" disc designed to minimise disc coning but the present work also includes an investigation of a conventional "frontvented" disc similar in dimension to the back-vented disc but with different detailed geometry. Experimental work was undertaken to derive the rotor material properties in tension and compression as a function of temperature. This data was used to generate suitable FE material model routines which accurately allow for the different temperature-dependent yield properties of cast iron in tension and compression. The modelling work highlights the role of the rotor geometry in controlling the thermal response of the structure but. more importantly, the necessity for an accurate material model is illustrated, particularly with regard to its ability to predict the accumulation of plastic strain which may lead to rotor cracking. Using the most accurate user developed material subroutine, the thermal response of the back-and front-vented disc designs are compared: the back-vented disc suffers lower thermal distortion but at the expense of higher plastic strain accumulation, particularly near the point of attachment of the vanes.

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Schick, Bastian. "A Digital Test Bench for Pneumatic Brakes." Thesis, KTH, Spårfordon, 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-290043.

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This master’s thesis covers the structuring and implementation of a digital testbench for the air brake system of freight trains. The test bench will serveto further improve the existing brake models at Transrail Sweden AB. Theseare used for the optimised calculation of train speed profiles by the DriverAdvisory System CATO. This work is based on the research of the technicalbackground, as well as the methodical approach to physical modelling anda modular implementation of the test bench. It gives full flexibility for thesimulation of customised train configurations using the European UIC brakesystem. Train length and vehicle arrangement can be adapted to the user’sspecific needs. For example, the test bench could be used for the simulation ofa train with distributed power. The system parameters are stored in a vehiclelibrary for the convenient generation of train configurations. This vehiclelibrary is freely expandable.The simulation is based on an equivalent electric circuit model which iscompleted with nozzle flow modelling. This model involves monitoring themain pipe, brake cylinder and reservoir pressure. Linear approximation is usedto obtain braking forces for the individual wagons and for the whole train. Thedepiction of the brake system behaviour is mostly accurate in the operationalscenarios, which is validated with measurement data. Additional calibrationis required for further reduction of the simulation errors and an extension ofthe model’s domain of validity. The test bench is developed by incrementaland iterative modelling and prepared for further improvements and variations,for example the adaption to the American AAR system variant.The presented work can also be used as a basis for similar implementationssuch as driving simulators. The methods are transferable to other applicationsof modular simulation.
Det här examensarbetet omfattar formgivningen och implementeringen aven digital provbänk för tyckluftsbromssystemet på godståg. Provbänken skaanvändas för att vidareutveckla befintliga bromsmodeller hos Transrail SwedenAB. De används för beräkningen av optimerade hastighetsprofiler förtåg i förarassistanssystemet CATO. Arbetet baserar sig på undersökningenav den tekniska bakgrunden, samt ett metodiskt angreppssätt för fysikaliskmodellering. Verktyget är implementerat på ett modulärt sätt. Provbänkenger full flexibilitet för simuleringen av skräddarsydda tågkonfigurationer somanvänder det europeiska UIC-bromssystemet. Tåglängd och fordonsanordningkan anpassas enligt användarens behov, till exempel för simulering av fördeladtraktion. Systemparametrarna lagras i ett fordonsbiliotek som förenklar inmatningenav tågkonfigurationer. Fordonsbiblioteket kan utvidgas enligt behov.Simuleringen är baserad på en ekvivalent strömkretsmodell, som kompletterasmed modellerad dysströmning. Simuleringen beskriver trycket ihuvudledningen, bromscylindern och förrådsluftsbehållaren. Bromskrafternaapproximeras linjärt efter trycken för de enskilda vagnarna såväl som helatåget. Simuleringen återger beteendet av bromssystemet i alla driftsituationerpå ett verklighetsnära sätt, enligt validering med mätdata från Knorr-Bremse:stestanläggning. Ytterligare kalibrering behövs för att minimera avvikelserna isimuleringen och för att utvidga modellens giltighetsdomän. Provbänken harutvecklats i stegvis modellering och är väl förberedd för vidareutveckling ochanpassning. Ett exempel är anpassningen för att simulera det amerikanskaAAR-bromssystemet.Arbetet som presenteras här är lämplig för användning i liknande applikationer,såsom körsimulatorer. Metoden kan tillämpas allmänt på övrigaanvändningsområden av modulär simulering.

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Shanmugam, Karthikeya. "Simulation model development of vehicle dynamics-brakes." Thesis, Uppsala universitet, Institutionen för informationsteknologi, 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-393300.

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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.

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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.

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Cronin, Kevin. "An investigation into mechanical antilock brakes for motorcycles." Thesis, Brunel University, 1992. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.333479.

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Ahmed, Ibrahim Lotfy Mohamed. "Study of the behaviour of vehicle disc brakes." Thesis, Northumbria University, 2002. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.393861.

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Papinniemi, Antti Aerospace Civil &amp Mechanical Engineering Australian Defence Force Academy UNSW. "Vibro-acoustic studies of brake squeal noise." Awarded by:University of New South Wales - Australian Defence Force Academy. School of Aerospace, Civil and Mechanical Engineering, 2008. http://handle.unsw.edu.au/1959.4/38696.

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Squeal noise has been an on-going concern with automotive brake systems since their inception. Even after many decades of research no single theory exists that adequately describes the phenomenon, and no general methods for eliminating squeal noise exist. Broadly speaking, three primary methods of analysis have been applied to understanding and eliminating brake squeal: analytical, experimental and numerical. Analytical models provide some insight into the mechanisms involved when a brake squeals, but have limitations in applicability to specific brake systems. Experimental methods provide the backbone of brake squeal investigations, especially in an industrial environment. However, the core focus of this thesis is to use a large scale finite element analysis (FEA) model to investigate brake squeal. Initially the FEA model was developed and the dynamic characteristics were validated against experimental modal analysis results. A complex eigenvalue analysis was performed to identify potential squeal modes which appear as unstable system vibration modes. Further techniques are described that allow the deeper probing of unstable brake system modes. Feed-in energy, which is the conversion of friction work into vibrational energy during the onset of squeal, is used to determine the relative contribution of each brake pad to the overall system vibration. The distribution of the feed-in energy across the face of a brake pad is also calculated. Component strain energy distributions are determined for a brake system as a guide to identifying which components might best be modified in addressing an unstable system mode. Finally modal participation is assessed by calculating the Modal Assurance Criterion (MAC) between component free modes and the component in the assembly during squeal. This allows participating modes to be visualised and aids in the development of countermeasures. The majority of the work in this thesis was performed using the commercial FEA code MSC.Nastran with user defined friction interfaces. An alternative approach using a contact element formulation available in Abaqus was also implemented and compared to the MSC.Nastran results. This analysis showed that considerable differences were noted in the results even though the overall predicted stability correlated relatively well to observed squeal. Abaqus was also used in a case study into the design of a brake rotor in a noisy brake system. The results of this study provided good correlation to observed squeal and facilitated effective rotor countermeasures to be developed. Some success was achieved in the main aims of predicting brake squeal and developing countermeasures. However, while the tools presented do allow a deeper probing of system behaviour during squeal, their use requires good correlation to observed squeal on brake system to be established. As such, their use as up-front design tools is still limited. This shortcoming stems from the complexity of brake squeal itself and the limitations in modelling the true nature of the non-linearities within a brake system.

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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.

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Coimbatore, Subramanian Shankar Ram. "A diagnostic system for air brakes in commercial vehicles." Texas A&M University, 2003. http://hdl.handle.net/1969.1/5857.

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This dissertation deals with the development of a model-based diagnostic system for air brake systems that are widely used in commercial vehicles, such as trucks, tractor-trailers, buses, etc. The performance of these brake systems is sensitive to maintenance and hence they require frequent inspections. Current inspection techniques require an inspector to go underneath a vehicle to check the brake system for possible faults, such as leaks, worn brake pads, out-of-adjustment of push rods, etc. Such inspections are time consuming, labor intensive and difficult to perform on vehicles with a low ground clearance. In this context, the development of an onboard/ handheld diagnostic tool for air brakes would be of significant value. Such a tool would automate the brake inspection process, thereby reducing the inspection time and improving the safety of operation of commercial vehicles. In this dissertation, diagnostic schemes are developed to automatically detect two important and prevalent faults that can occur in air brake systems Ã¢ÂÂ leaks and out-of-adjustment of push rods. These diagnostic schemes are developed based on a nonlinear model for the pneumatic subsystem of the air brake system that correlates the pressure transients in the brake chamber with the supply pressure to the treadle valve and the displacement of the treadle valve plunger. These diagnostic schemes have been corroborated with data obtained from the experimental facility at Texas A&M University and the results are presented. The response of the pneumatic subsystem of the air brake system is such that it can be classified as what is known as a Ã¢ÂÂSequential Hybrid SystemÃ¢ÂÂ. In this dissertation, the term Ã¢ÂÂhybrid systemsÃ¢ÂÂ is used to denote those systems whose mathematical representation involves a finite set of governing ordinary differential equations corresponding to a finite set of modes of operation. The problem of estimating the push rod stroke is posed as a parameter estimation problem and a transition detection problem involving the hybrid model of the pneumatic subsystem of the air brake system. Also, parameter estimation schemes for a class of sequential hybrid systems are developed. The efficacy of these schemes is illustrated with some examples.

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Leigh, Benjamin David. "Strength degradation of carbon-carbon composites for aircraft brakes." Thesis, University of Bath, 1999. https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.285332.

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Rodriguez, Manuel A. "NATEF Certification curriculum for a course in automotive brakes." CSUSB ScholarWorks, 1988. https://scholarworks.lib.csusb.edu/etd-project/540.

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Bowlin, Christopher Leland. "A pressure control scheme for air brakes in commercial vehicles." Texas A&M University, 2005. http://hdl.handle.net/1969.1/4934.

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This research is focused on developing a control scheme for regulating the pressure in the brake chamber of an air brake system found in most commercial vehicles like trucks, tractor-trailers and buses. Such a control scheme can be used for providing the ground work for future systems such as forward collision avoidance systems, advanced anti-lock brake systems and differential braking systems. The development of this controller involves two tasks. The first task was the development of a control scheme for achieving the desired pressure in the brake chamber. This scheme was based on a mathematical model of the treadle valve of the air brake system. The second task was the implementation of this control scheme on the experimental facility that was set up at Texas A&M University. The results indicate successful control of a desired brake chamber pressure for a demonstrated range of controller gains.

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Wahlström, Jens. "A study of airborne wear particles from automotive disc brakes." Doctoral thesis, KTH, Maskinelement, 2011. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-31152.

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During braking, both the disc and pads in disc brakes are worn. Since disc brakes are not sealed,some of the wear particles generated can become airborne. Several studies have found anassociation between adverse health effects and the concentration of particles in the atmosphere,so it is of interest to improve our knowledge of the airborne wear particles generated by discbrakes. This thesis deals with experimental and computational methods focusing on airborne wearparticles from disc brakes. The eight appended papers discuss the possibility to both measure andnumerically determine the concentration and size distribution of airborne wear particles thatoriginate from the pad-to-disc contact. The objective is to increase the scientific knowledge ofairborne wear particles generated from disc brakes. Papers A, B and C describe tests of disc brake materials conducted in a modified pin-on-discmachine. The results show that the test set-up can be used to measure and rank disc brakematerials with respect to the concentration of airborne particles generated. Ultrafine (nanosized),fine and coarse airborne wear particles that contain metals such as iron, copper and tin werefound. Papers D and E describe a novel disc brake assembly test stand and tests of disc brake materialsconducted in it. The results show that the test set-up can be used to measure the concentrationand size distribution of airborne wear particles generated from disc brake materials. The resultsalso indicate an ability to rank different pad/disc combinations with respect to the concentrationof airborne wear particles. Furthermore, the results suggest that this test stand can be used tostudy rust layer removal from the disc and that airborne particles are generated even at low brakepressures, such as used to remove dirt from the disc. Paper F compares measurements made in passenger car field tests with measurements made in adisc brake assembly test stand and in a pin-on-disc machine. A promising correlation between thethree different test methods is found. Paper G presents and discusses a simulation methodology that numerically determines theconcentration and size distribution of airborne wear particles generated from the pad-to-disccontact in disc brakes by using general-purpose finite element software. Paper H discusses a cellular automaton model that describes the microscopic contact situationbetween the pad and disc in disc brakes. This model is used to numerically determine the amountof wear that leaves the contact. The results correlate qualitatively with experimental observationsfound in the literature.
QC 20110317

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Voller, Gordon Paul. "Analysis of heat dissipation from railway and automotive friction brakes." Thesis, Brunel University, 2003. http://bura.brunel.ac.uk/handle/2438/5558.

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The thesis presents research into the understanding and improvement of heat dissipation from friction brakes. The investigations involved two brake types, considered to be the most thermally loaded and therefore most challenging; axle mounted high speed railway and commercial vehicle disc brakes. All three modes of heat transfer (conduction, convection and radiation) and airflow characteristics have been analysed experimentally and theoretically in order to increase the understanding of heat dissipation. Despite the very practical aspects of this research, a 'generic heat transfer approach' was applied, enabling wider engineering applications of the results. Experimental analyses conducted on a specially developed Spin Rig allowed measurements of cooling and airflow characteristics for different designs. Methodologies have been developed to determine thermal contact resistance, heat transfer coefficients, emissivity and aerodynamic (pumping) losses. Established values and relationships compared very favourably with theoretical work. Analytical, FE and CFD analyses were employed to further investigate design variations and perform sensitivity studies. Inertia dynamometer route simulations provided disc temperatures for validation of the overall work. Recommendations have been made for optimising heat dissipation, by proposing practically acceptable and economically viable design solutions. A proposed ventilated disc design efficiency ratio allows large, high speed ventilated disc designs, to be efficiently and accurately evaluated and compared, providing a valuable disc design optimisation tool. The determination of the methodologies, parameters and functions defining cooling characteristics, enable heat dissipation to be predicted confidently and accurately for brakes and other engineering assemblies at early design stages.

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Steel, William Perry. "Absolute displacement measurement of noisy disc brakes using holographic interferometry." Thesis, University of Huddersfield, 2005. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.418627.

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Senkal, Doruk. "Haptic surgical aid system with magnetorheological brakes for dental implants." Pullman, Wash. : Washington State University, 2009. http://www.dissertations.wsu.edu/Thesis/Fall2009/d_senkal_111509.pdf.

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Thesis (M.S. in mechanical engineering)--Washington State University, December 2009.
Title from PDF title page (viewed on Jan. 4, 2010). "School of Engineering and Computer Science." Includes bibliographical references (p. 77-81).

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Ripley, Ian, and ian ripley@qr com au. "An Investigation of Brake Application Delays in Australian Train Brake Systems." Central Queensland University. Engineering, 2005. http://library-resources.cqu.edu.au./thesis/adt-QCQU/public/adt-QCQU20060720.100110.

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An investigation of brake application delays in Australian train brake systems began with a literature review of pneumatic train braking systems. Data located in the review gave examples of brake application delays of pre 1990 designs from the U.K., India and North America. Information on application delays on later Australian designs was scarce. Reading of literature has shown a difference between the Australian and North American control valves in the way the propagation of the pressure reduction rate in the brake pipe is maintained. Control valves of the North American style allow the brake pipe air to be connected for a short time to a small cavity or quick service volume of each valve. The quick service volume is then released to atmosphere. The action of exhausting a small amount of air from the brake pipe helps to ensure a propagation of an adequate pressure reduction rate as it travels to the next valve. Australian control valves rely on the ratio of the volume of brake pipe between control valves and the size of the quick service volume or bulb to ensure the propagation of an adequate pressure reduction as it travels to the next valve. The air in a bulb of an Australian valve is not expelled to atmosphere until a brake release is made. The research explored possible reductions in application delays by utilizing an experimental pipe test rack that included 4 control valves and 120 meters of brake pipe. Experiments with different configurations of exhaust orifices or chokes, valves and branch pipe lengths that supplied the valves gave a record acquired by data acquisition of the timing of each valve and the local pressure drop from a valve or each valve for comparison. Experiments with exhaust chokes that gave a reduction drop rate in the brake pipe that approached the minimum required to operate a control valve resulted in instability of the application operation of the control valve. The quick service volume of different sizes was included in the experiments to give comparisons in the propagation of the pressure reduction toward the end of a long train. Further increases into the size of the bulb of a control valve to enhance the propagation features toward the end of a long train are discussed. The branch pipe with different diameters from 12 mm to 20 mm and lengths from 160 mm to 800 mm when fitted to an adaptor pipe bracket were investigated and results show that larger diameters gave larger gulps in the brake pipe. Other components that were studied included the pipe bracket that is fitted on some control valves. The pipe bracket and isolation cock was found to add 282 mm of additional length to the air path and while not changing the operation of the valve, the results showed a smaller drop in local pressure in the brake pipe to assist the pressure reduction rate than shown in valves without pipe brackets.

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Hodel, Marcelo Nogueira. "Análise comparativa entre ensaios controlados e aplicações reais de pastilhas de freio de caminhões." [s.n.], 2010. http://repositorio.unicamp.br/jspui/handle/REPOSIP/264199.

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Orientador: Kátia Lucchesi Cavalca Dedini
Dissertação (mestrado) - Universidade Estadual de Campinas, Faculdade de Engenharia Mecânica
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Resumo: Com a necessidade do lançamento de novos produtos e a introdução de novas tecnologias, em tempos cada vez mais competitivos, as empresas automobilísticas desenvolvem métodos para homologação de seus produtos, visando reduzir o tempo de desenvolvimento, e continuar atendendo aos requisitos de qualidade. Sendo assim, no setor automobilístico são desenvolvidas pistas de testes, para simular as principais características das aplicações veiculares, visando antecipar e analisar os resultados de confiabilidade dos componentes, antes do lançamento do veículo no mercado. Para avaliar os resultados obtidos durante a simulação é preciso compará-los com os dados de garantia, entretanto há componentes que são considerados itens de desgaste, que não são cobertos em garantia pela montadora, dificultando a comparação entre a simulação e os dados de garantia. Para validar os resultados obtidos por meio de uma simulação, para pastilhas de freio foram selecionadas amostras de usuários do veículo, logo após o seu lançamento. Foram realizados acompanhamentos sobre o desgaste das pastilhas de freio, para se obter os dados de confiabilidade em aplicações reais. Este estudo possui o objetivo de comparar os dados obtidos nos dois testes citados utilizando os conceitos de confiabilidade. A metodologia desenvolvida pode ser aplicada para validar os ensaios realizados para itens de desgaste, durante o desenvolvimento de novos produtos, principalmente veículos
Abstract: Due to the necessity of launching new products and the introduction of new technologies in more and more competitive times, automobile companies develop methods in order to get the approval of its products aiming at reducing the development time and keep meeting the quality requirements. Thus, in the automobile sector test tracks are developed in order to simulate the vehicle applications main features aiming at anticipating and analyzing the reliability results of components before launching the product in the market. In order to check the effectiveness of the results obtained during the simulation test, it is necessary to compare them with warranty data. However, there are components which are considered wear items and which aren't covered by the automaker warranty making it difficult the comparison with the results obtained in the simulation tests. Thus, in order to check the effectiveness of the results obtained through a simulation to brake pads it was selected samples from many vehicle users right after its launch and it was monitored for the wear of brake pads, aiming at obtaining reliability data in real application. The objective of this work is compare information obtained in both tests, using the reliability concepts. The developed methodology can be applied to validate the tests to wear items, during the development of new products, mainly vehicles
Mestrado
Mecanica dos Sólidos e Projeto Mecanico
Mestre em Engenharia Mecânica

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27

Henderson, Leon Michael. "Improving emergency braking performance of heavy goods vehicles." Thesis, University of Cambridge, 2014. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.648714.

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Rodriguez, Alexander John, and alex73@bigpond net au. "Experimental Analysis of Disc Thickness Variation Development in Motor Vehicle Brakes." RMIT University. Aerospace, Mechanical and Manufacturing Engineering, 2006. http://adt.lib.rmit.edu.au/adt/public/adt-VIT20070209.123739.

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Over the past decade vehicle judder caused by Disc Thickness Variation (DTV) has become of major concern to automobile manufacturers worldwide. Judder is usually perceived by the driver as minor to severe vibrations transferred through the chassis during braking [1-9]. In this research, DTV is investigated via the use of a Smart Brake Pad (SBP). The SBP is a tool that will enable engineers to better understand the processes which occur in the harsh and confined environment that exists between the brake pad and disc whilst braking. It is also a tool that will enable engineers to better understand the causes of DTV and stick-slip the initiators of low and high frequency vibration in motor vehicle brakes. Furthermore, the technology can equally be used to solve many other still remaining mysteries in automotive, aerospace, rail or anywhere where two surfaces may come in contact. The SBP consists of sensors embedded into an automotive brake pad enabling it to measure pressure between the brake pad and disc whilst braking. The two sensor technologies investigated were Thick Film (TF) and Fibre Optic (FO) technologies. Each type was tested individually using a Material Testing System (MTS) at room and elevated temperatures. The chosen SBP was then successfully tested in simulated driving conditions. A preliminary mathematical model was developed and tested for the TF sensor and a novel Finite Element Analysis (FEA) model for the FO sensor. A new method called the Total Expected Error (TEE) method was also developed to simplify the sensor specification process to ensure consistent comparisons are made between sensors. Most importantly, our achievement will lead to improved comfort levels for the motorist.

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Tran, Nguyen Duy Phuong. "Development of a flexible protective system for press-brakes using vision." Mémoire, École de technologie supérieure, 2009. http://espace.etsmtl.ca/86/1/TRAN_Nguyen_Duy_Phuong.pdf.

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Les presse-plieuses sont utilisees dans la plupart des ateliers de fabrication pour le phage, le formage, le redressage, le poin9onnage et le decoupage. Malheureusement, ces machines polyvalentes ont cause de nombreux accidents sur les travailleurs qui devront tenir la piece ou de mettre les mains dans les zones dangereuses afm de maintenir le rythme de production. II est connu que le mouvement du belier hydraulique dans les presse-plieuses peut etre arrete a tout moment pendant le fonctionnement ce qui est impossible dans le cas des presseplieuses mecaniques. Pour cette raison, seul le developpement d'un systeme de protection pour presse-plieuse hydraulique est recommande. II a egalement ete observe que la plupart des systemes existants avaient une zone d'interdiction fixe, qui arrete la presse-plieuse hydraulique au moment oil les mains du travailleur y entrent. Ces systemes de protection sont incapables de distinguer le mouvement des mains des travailleurs, qui sont diriges vers la zone de I'outil de coupe ou vers I'exterieur de cette zone dangereuse. II est done trop restreint de repondre aux besoins de production. Afin d'ameliorer la flexibilite du systeme de protection, il est necessaire de developper un nouveau systeme. Cette these presente le developpement d'un systeme flexible de protection en tenant compte du mouvement de la main du travailleur. La solution innovante consiste a generer une zone d'interdiction flexible dont les dimensions et la forme dependent de la vitesse instantanee du point inspecte, du temps d'arret de la machine et du temps de calcul du processus. Le mouvement instantane d'un point inspecte sur la main du travailleur est depiste par des cameras distribuant des differentes vues. La machine sera arretee immediatement chaque fois que le point inspecte est entre dans la zone flexible d'interdiction. L'interference entre le point inspecte et la zone flexible d'interdiction est determinee par le vecteur traversable dans I'espace. Deux approches concernant le nombre de points inspectes sont presentees. Le point inspecte sur la main du travailleur est un point unique et virtuel dans la premiere approche, tandis qu'au moins trois points virtuels sont dans la deuxieme approche. L'objectif de la premiere approche a pour but de reduire le temps de processus tandis que celui de la deuxieme approche a pour but d'augmenter la precision de posifionnement des points. Le travail presente dans cette these prouve que le principe d'etablissement de la zone flexible a I'aide de la technologie de vision pour la protection des mains de I'operateur de presses plieuses est realisable.

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30

Hutton, Toby. "The friction and wear of carbon-carbon composites for aircraft brakes." Thesis, University of Bath, 1996. https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.760692.

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31

Miller, Richard A. "NDE method for carbon-carbon composite disk brakes using infrared thermography /." Available to subscribers only, 2008. http://proquest.umi.com/pqdweb?did=1650510601&sid=2&Fmt=2&clientId=1509&RQT=309&VName=PQD.

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32

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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No
Braking 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.

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33

Badertscher, Jeff (Jeffrey William). "Experimental Investigation of Dither Control on Effective Braking Torque." Thesis, Georgia Institute of Technology, 2005. http://hdl.handle.net/1853/7119.

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Dither control is a method of introducing high frequency control efforts into a system to suppress a lower frequency disturbance. Dither control is an effective means of suppressing automotive brake squeal. Brake squeal is a problem that has plagued the automotive industry for years. In fact many makers of materials for brake pads spend up to 50% of their engineering budgets on noise, vibration and harshness issues. A normal dither signal may be introduced to an automotive braking system by placing a piezoceramic stack actuator in the piston of a floating caliper brake. Many theoretical models indicate a reduction in the braking torque due to the dither signal. Under the assumption of Hertzian contact stiffness the loss in braking torque is due to lowering of the average normal force. There are also theories that the dither signal eliminates the stick-slip oscillation causing an effective decrease in the friction force. Yet another theory indicates that the effective contact area is reduced, lowering the mean coefficient of friction. It is not apparent whether any of these models accurately portrays the interaction of the brake pads and rotor.

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34

Zhuan, Xiangtao. "Optimal handling and fault-tolerant speed regulation of heavy haul trains." Pretoria : [s.n.], 2006. http://upetd.up.ac.za/thesis/available/etd-07212007-131319.

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35

Graf, Aaron John. "Active control of automotive disc bake rotor squeal using dither." Thesis, Georgia Institute of Technology, 2000. http://hdl.handle.net/1853/16933.

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36

Wahlström, Jens. "Towards a simulation methodology for predictionof airborne wear particles from disc brakes." Licentiate thesis, KTH, Machine Design (Div.), 2009. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-11044.

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During braking, both the rotor and the pads in disc brakes are worn. Since disc brakes are not sealed, some of the wear particles generated can become airborne. Several studies have found an association between adverse health effects and the concentration of particles in the atmosphere, so it is of interest to improve our knowledge of the airborne wear particles generated by disc brakes. However, in field tests it is difficult to distinguish these particles from others in the surrounding environment, so it may be preferable to use laboratory test stands and/or simulation models to study the amount of airborne wear particles generated.

This thesis deals with a simulation methodology for prediction of airborne wear particles from disc brakes and three experimental methods for testing disc brake materials with focus on airborne wear particles. The four appended papers discuss the possibility to both measure and predict the number and size distribution of airborne wear particles that originate from the pad to rotor contact. The objective is to develop a simulation methodology that predicts the number and size distribution of airborne wear particles from disc brakes.

Paper A describes how a modified pin-on-disc machine was used to study airborne wear particles originating from different disc brake materials. The results indicate that the test setup can be used to measure and rank the number concentration and size distribution of the airborne wear particles generated.

Paper B describes a disc brake assembly test stand for measurements of airborne wear particles from disc brakes. The results indicate that the test setup can be used to measure the number concentration and size distribution of airborne wear particles generated from disc brake materials. The results also indicate a promising ability to rank different pad/rotor material combinations with respect to the number concentration of airborne wear particles.

Paper C compares measurements made in passenger car field tests with measurements made in a disc brake assembly test stand and in a pin-on-disc machine. A promising correlation between the three different test methods is found.

Paper D presents a simulation methodology for predicting the number and size distribution of airborne wear particles using finite element analysis (FEA). The simulated number distribution is compared with experimental measurements at component level. The result indicates that the proposed methodology may be used to predict the number concentration and size distribution of airborne particles generated in the pad-to-rotor contact.

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37

Kleinsimlinghaus, Karolina [Verfasser]. "Establishment of anti-apoptotic brakes in human neurons during maturation / Karolina Kleinsimlinghaus." Bonn : Universitäts- und Landesbibliothek Bonn, 2019. http://d-nb.info/1223538044/34.

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38

Bradley, Luke R. "Mechanical testing and modelling of carbon-carbon composites for aircraft disc brakes." Thesis, University of Bath, 2003. https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.426204.

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39

Drtílek, Juraj. "Experimentální identifikace NVH brzdových soustav." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2017. http://www.nusl.cz/ntk/nusl-318537.

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This Diploma Thesis is dedicated to solve the source of noise, observed during braking processes on tested vehicle, called Gouki noise and has been worked out in corporation with Federal Mogul company. The aim of this work to create test methology, which allows to experimentally detect the source of undesirable noise and eventually suggest next steps in its prevention.

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Michaux, Michael Andre. "Suppression of Friction-Induced Oscillations through Use of High-Frequency Dither Signals." Diss., Georgia Institute of Technology, 2005. http://hdl.handle.net/1853/7150.

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Friction-induced oscillations occur in many engineering systems, often resulting in noise, vibration, and excessive or uneven wear. This research addresses the suppression of such oscillations, especially with application to braking systems, through the use of high-frequency dither signals. Brake squeal is an annoying and elusive problem too often present in braking systems of automobiles, trucks and aircraft. In previous work, the effectiveness of high-frequency dither to eliminate squeal in an automotive disc brake assembly was demonstrated experimentally. The main features of the dither-squeal cancellation system was the application of a high frequency variation in the brake pressure force accomplished by means of a piezoelectric stack placed behind one of the brake pads. This thesis contains a theoretical and numerical treatment of the application of dither to frictional systems. Two types of systems are investigated. The first is a classic, mass-on-a-moving belt problem, which experiences friction-induced oscillations similar to those encountered in brake applications. The system is first studied using an analytical technique based on the method of averaging. It is shown that, depending on the system, friction, dither-waveform, and belt-speed parameters, dither can stabilize an unstable system. However, in some cases, dither can destabilize an initially stable system. These results are verified numerically using time integration. The second type of system analyzed in this thesis is an annular plate with a rotating frictional device. The method of multiple scales is used to predict subcritical regions of instability; the results are validated using Floquet theory. The thesis treats both tangential and normal dither, the latter being closer to the brake application. It is found that normal dither, in addition to being harder to analyze, is much less effective than tangential dither.

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41

Wahlström, Jens. "Towards a simulation methodology for prediction of airborne wear particles from disc brakes /." Stockholm : KTH, 2009. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-11044.

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42

Wahlström, Jens. "Towards a simulation methodology for prediction of airborne wear particles from disc brakes." Licentiate thesis, KTH, Maskinkonstruktion (Avd.), 2009. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-11044.

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During braking, both the rotor and the pads in disc brakes are worn. Since disc brakes are not sealed, some of the wear particles generated can become airborne. Several studies have found an association between adverse health effects and the concentration of particles in the atmosphere, so it is of interest to improve our knowledge of the airborne wear particles generated by disc brakes. However, in field tests it is difficult to distinguish these particles from others in the surrounding environment, so it may be preferable to use laboratory test stands and/or simulation models to study the amount of airborne wear particles generated. This thesis deals with a simulation methodology for prediction of airborne wear particles from disc brakes and three experimental methods for testing disc brake materials with focus on airborne wear particles. The four appended papers discuss the possibility to both measure and predict the number and size distribution of airborne wear particles that originate from the pad to rotor contact. The objective is to develop a simulation methodology that predicts the number and size distribution of airborne wear particles from disc brakes. Paper A describes how a modified pin-on-disc machine was used to study airborne wear particles originating from different disc brake materials. The results indicate that the test setup can be used to measure and rank the number concentration and size distribution of the airborne wear particles generated. Paper B describes a disc brake assembly test stand for measurements of airborne wear particles from disc brakes. The results indicate that the test setup can be used to measure the number concentration and size distribution of airborne wear particles generated from disc brake materials. The results also indicate a promising ability to rank different pad/rotor material combinations with respect to the number concentration of airborne wear particles. Paper C compares measurements made in passenger car field tests with measurements made in a disc brake assembly test stand and in a pin-on-disc machine. A promising correlation between the three different test methods is found. Paper D presents a simulation methodology for predicting the number and size distribution of airborne wear particles using finite element analysis (FEA). The simulated number distribution is compared with experimental measurements at component level. The result indicates that the proposed methodology may be used to predict the number concentration and size distribution of airborne particles generated in the pad-to-rotor contact.

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43

Stonawski, Ondrej. "NON-DESTRUCTIVE EVALUATION OF CARBON/CARBON BRAKES USING AIR-COUPLED ULTRASONIC INSPECTION SYSTEMS." Available to subscribers only, 2008. http://proquest.umi.com/pqdweb?did=1674101471&sid=2&Fmt=2&clientId=1509&RQT=309&VName=PQD.

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Thesis (M.S.)--Southern Illinois University Carbondale, 2008.
"Department of Mechanical Engineering and Energy Processes." Keywords: Air-coupled ultrasonic, Carbon/carbon brakes, Nondestructive evaluation. Includes bibliographical references (p. 114-115). Also available online.

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44

Wallis, Lisa M. Mechanical &amp Manufacturing Engineering Faculty of Engineering UNSW. "A comparison of bi-directional disc brake rotor passage designs." Awarded by:University of New South Wales. School of Mechanical & Manufacturing Engineering, 2003. http://handle.unsw.edu.au/1959.4/20312.

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An important part of automobile safety is the braking system. Disc brakes have been widely used in automobiles for sped retardation for over 30 years. During that time, they have developed from a simple disc to a complex disc with channels, vanes, holes and grooves. The stopping capability of disc brakes is affected by the rate at which heat is dissipated by forced convection and the thermal capacity of the rotor. Catastrophic failure of brake rotors can occur during rapid increases or decreases in rotor temperature where regions of high temperature gradients result in high thermal strains. There is little information in the public domain regarding the relative merits of different disc brake rotor geometries, particularly in terms of airflow patterns, heat transfer rates, and internal thermal gradients. The aim of this research project was to investigate how geometrical variations affect the thermal performance of bi-directional disc brake rotors, particularly for high performance applications. Dynamometer testing showed that respectable increases in braking performance are achievable with relatively simple machining modifications. Tuft and smoke visualization techniques provided a preliminary understanding of the airflow in the passages of three distinct bi-directional rotor designs. Particle Image Velocimetry was used for detailed flow measurements which supported the numerical simulations. Computational Fluid Dynamics was used to predict the airflow and heat transfer associated with eight bi-directional brake rotor designs. The results show that 'pillared' passage designs can achieve higher heat transfer rates than traditional straight radial vane designs and that the heat loss from pillared rotors is generally more uniform than from vaned rotors. Subsequent conjugate heat transfer simulations found that temperature gradients inside pillared rotors are typically lower than inside vaned rotors. Thus failure rates due to excessive thermal strain are expected to be lower for pillared rotors. It was shown that rotor selection based solely on heat transfer rates is inappropriate and different passage designs are suited to different applications. The findings of this research will directly benefit local disc brake manufacturers, who do not have resources to conduct thorough studies comparing the thermal characteristics of different brake rotor designs.

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45

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

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46

Rye, Ryan Patrick. "Investigation of disc brake squeal via sound intensity and laser vibrometry." Thesis, Georgia Institute of Technology, 2000. http://hdl.handle.net/1853/19045.

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47

Midgley, William John Baudinet. "Regenerative braking of urban delivery heavy goods vehicles." Thesis, University of Cambridge, 2013. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.607710.

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48

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 [...]

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49

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.

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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

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50

Sarip, S. Bin. "Lightweight friction brakes for a road vehicle with regenerative braking : design analysis and experimental investigation of the potential for mass reduction of friction brakes on a passenger car with regenerative braking." Thesis, University of Bradford, 2011. http://hdl.handle.net/10454/5486.

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One of the benefits of electric vehicles (EVs) and hybrid vehicles (HVs) is their potential to recuperate braking energy. Regenerative braking (RB) will minimize duty levels on the brakes, giving advantages including extended brake rotor and friction material life and, more significantly, reduced brake mass and minimised brake pad wear. In this thesis, a mathematical analysis (MATLAB) has been used to analyse the accessibility of regenerative braking energy during a single-stop braking event. The results have indicated that a friction brake could be downsized while maintaining the same functional requirements of the vehicle braking in the standard brakes, including thermomechanical performance (heat transfer coefficient estimation, temperature distribution, cooling and stress deformation). This would allow lighter brakes to be designed and fitted with confidence in a normal passenger car alongside a hybrid electric drive. An approach has been established and a lightweight brake disc design analysed FEA and experimentally verified is presented in this research. Thermal performance was a key factor which was studied using the 3D model in FEA simulations. Ultimately, a design approach for lightweight brake discs suitable for use in any car-sized hybrid vehicle has been developed and tested. The results from experiments on a prototype lightweight brake disc were shown to illustrate the effects of RBS/friction combination in terms of weight reduction. The design requirement, including reducing the thickness, would affect the temperature distribution and increase stress at the critical area. Based on the relationship obtained between rotor weight, thickness and each performance requirement, criteria have been established for designing lightweight brake discs in a vehicle with regenerative braking.

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Dissertations / Theses on the topic 'Brakes'

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