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Artykuły w czasopismach na temat „Brake”
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1
Duraisivam, Sivam, i E. Jamuna. "Thermal Analysis and Fabrication of Split Shoe Drum Brake". Applied Mechanics and Materials 867 (lipiec 2017): 239–44. http://dx.doi.org/10.4028/www.scientific.net/amm.867.239.
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Active control of vehicle dynamics has become one of the top competitive features in today’s automobiles. Vehicle dynamics control systems include effective brakes and the number of life loss has been increased due to the in effective brakes. To reduce the crashing of vehicles caused by the braking disability by overcoming the drawbacks of the conventional braking system.Brakes are employed to stop or slow down the speed of the vehicle depending upon the driving needs. When brake applied, each wheel of the vehicle builds-up a certain braking force. For this reason, greater the number of wheels braked, greater will be the braking effect, and sooner the vehicle comes to halt. With this in mind the existing air brake system of a 6 wheeler is studied and analyzed. Brake shoe assembly is completely modeled using solid works and the analysis of the brake shoe assembly is carried out in Ansys .The results are analyzed . Then redesigned brake shoe assembly is modeled in solid works and analyzed with certain changes as required.
2
Solovykh, Yevhen, Viktor Dubovyk, Andrii Solovykh, Stanislav Katerynych i Maksym Ishov. "Investigation of the Braking Process of Suspended Wheels of a Car With a Hydraulic Brake Drive". Central Ukrainian Scientific Bulletin. Technical Sciences, nr 3(34) (październik 2020): 282–89. http://dx.doi.org/10.32515/2664-262x.2020.3(34).282-289.
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For diagnosing car braking systems, bench methods have become the most widespread, and on power stands with running drums. The main disadvantage of these methods is the high cost of brake stands with low quality diagnostic information. At the same time the method of diagnosing brake systems on change of angular speed of the hung up wheels is perspective. But the considered method does not have a sufficiently complete theoretical justification, especially for cars with hydraulic brakes and therefore requires research. Therefore, the work substantiates the diagnostic modes and diagnostic parameters, obtained analytical dependences of the process of braking car wheels with hydraulic brakes, which describe the change in the angular deceleration of the suspended wheels over time in different parts of the brake diagram and the delay time of the brake system. The mathematical model is based on the differential equation of motion of the braked wheel when braking a car with a connected transmission (with clutch engaged) on a straight horizontal section of road. The change in braking torque during braking is determined by the nature of the pressure change in the drive. When braking the wheel, the braking force acts on the radius of the brake drum. The obtained analytical dependences make it possible to study the influence of various factors of the technical condition of brake systems on the performance of the braking process. In order to substantiate the diagnostic modes and diagnostic parameters, analytical dependences of the process of braking car wheels with hydraulic brakes have been developed, describing the change of angular deceleration of suspended wheels in time at different parts of the brake diagram and time delay of the brake system. The obtained analytical dependences make it possible to study the influence of various factors of the technical condition of brake systems on the performance of the braking process.
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Sawczuk, Wojciech, Armando Miguel Rilo Cañás, Dariusz Ulbrich i Jakub Kowalczyk. "Modeling the Average and Instantaneous Friction Coefficient of a Disc Brake on the Basis of Bench Tests". Materials 14, nr 16 (23.08.2021): 4766. http://dx.doi.org/10.3390/ma14164766.
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This article presents the results of tests conducted on the average and instantaneous friction coefficients of railway vehicle disc brakes. The tests were carried out independently of various states of wear on the friction linings and the brake disc. The requirements of the International Union of Railways (UIC) regarding the approval of brake linings for use were taken into account. Based on many years of research using a brake bench to test railway disc brakes, the authors developed multiple regression models for the average friction coefficient and fluctuations (tolerances) in the instantaneous friction coefficient and achieved 870 results. The models proposed three types of variables: the input braking parameters (speed, pressure, and mass to be braked), operational parameters (the wear on the friction linings and the brake disc), and design parameters (perforations in the form of holes on the disc surface). The above two models were validated on the basis of 384 brakes, and in subsequent stages a further evaluation was performed. The coefficients were determined to be, respectively, 0.99 for the model of the average friction coefficient and 0.71 for the model of tolerance (fluctuations) of the instantaneous friction coefficient.
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Novianto, R. Arief, i Galuh Achmaditiya. "Impact of Adjusting Brake Lining Gap and Brake Drum Temperature on Brake Efficiency of Motor Vehicles". RSF Conference Series: Engineering and Technology 2, nr 2 (29.11.2022): 256–63. http://dx.doi.org/10.31098/cset.v2i2.579.
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In motor vehicle systems, brakes are one of the important components that have a major role in reducing the risk of accidents on the highway. In the brake system, especially drum brakes, improper component adjustment can cause the brakes not to work optimally. This research was conducted to determine the impact of large variations in the brake lining gap and brake drum temperature on brake efficiency in motorized vehicles. This study uses an experimental method with variations in the adjustment of the size of the brake lining gap and the temperature of the drum brake. The main brake efficiency was tested using a brake tester from these several variations. The variations of the brake lining gap used are 0.3 mm, 1 mm, and 1.7 mm. Meanwhile, the brake drum temperature is set at 30, 90, and 150 degrees Celsius. The result of this research is that the wider the brake lining gap, the smaller the brake efficiency. The greater the temperature on the drum brake also affects the smaller the efficiency of the brake. Meanwhile, the variable brake lining gap and temperature simultaneously (together) affect the level of brake efficiency. The larger gap between the lining and the temperature of the drum brake, the lower the efficiency of the brake obtained.
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Wang, Songlei, Fang Liu i Hui Jin. "Application of Conical Surface Brakes in Cranes". Journal of Physics: Conference Series 2437, nr 1 (1.01.2023): 012073. http://dx.doi.org/10.1088/1742-6596/2437/1/012073.
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Abstract Both drum brakes and disc brakes have their own structural limitations and advantages. As a new type of industrial brake, cone brake combines the advantages of electric hydraulic drum brake and electric hydraulic disc brake, makes up for the shortcomings of drum brake and disc brake, and greatly improves the service performance and safety performance of the brake. This paper introduces the structure composition and working principle of the conical surface brake, analyzes the advantages of the conical surface brake through the comparison with the drum brake, carries out experimental research, analyzes the test results, gives optimization suggestions for the existing shortcomings, and explores the application prospect of the new brake combined with the introduction of application examples. This paper provides a reference for the technical innovation of brake and a new choice for brake users.
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Li, Ai Ran, Yu Jin Fan, Teng Han, Zhe Kun Li, Pei Lin Zhao i Jun Jie Wang. "Properties of Hydraulic Floating Caliper Brake for AGV Car". Applied Mechanics and Materials 644-650 (wrzesień 2014): 33–36. http://dx.doi.org/10.4028/www.scientific.net/amm.644-650.33.
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Existing AGV car’s brakes are electromagnet brakes. Brake overheating causes brake damaged during work time.In this paper ,the hydraulic pressure floating caliper brake is applied to the AGV car . It with electromagnetic brake AGV car for braking performance comparison test, through comparative analysis know that hydraulic floating caliper brakes can not only meet the AGV car’s braking requirements and the system dynamic performance has improved greatly.
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Synák, František, Lenka Jakubovičová i Matúš Klačko. "Impact of the Choice of Available Brake Discs and Brake Pads at Different Prices on Selected Vehicle Features". Applied Sciences 12, nr 14 (21.07.2022): 7325. http://dx.doi.org/10.3390/app12147325.
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The purpose of a road vehicle’s friction brakes is to convert a vehicle’s kinetic energy to thermal energy. When doing so, the brakes should not be heated to such temperatures at which their efficiency could be reduced. The objective of the measurements in this article is to assess the ability of passenger brakes’ spare parts, brake discs and brake pads to meet the requirements for brakes. For the experimental measurements, brake discs and brake pads of high, middle and low prices were selected from advertisements intended for a particular vehicle. The measurements were performed via driving test measurements as well as under laboratory conditions. Driving test measurements determined the brake distance and mean fully developed deceleration of the brake components of all three price categories. On the other hand, the dependence between the effort to control the steering and the brake force, as well as the temperature of brake discs during repeated interrupted braking and continuous uninterrupted braking, were determined under laboratory conditions. Attention was also given to prevention against corrosion. The results show a sufficient ability of all the brake pads and brake discs tested to generate braking force under common conditions. However, when using the lowest-priced brake discs and brake pads, a substantial reduction in their efficiency can occur if braking intensively or over a long period.
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Rievaj, Vladimír, Lenka Mokričková i František Synák. "Temperature of the brakes and the Braking Force". Transport and Communications 5, nr 1 (2017): 13–16. http://dx.doi.org/10.26552/tac.c.2017.1.3.
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The kinetic energy of the braking vehicle is changed into heat and the resulting heat increases the temperature of each part of brakes. The changed temperature affects the coefficient of friction between the brake lining and brake drum of brake disc. Unless the brakes are actuated hydraulically there is the warning brake pads and brake fluid. Object of examination in this article is the impact of repetitive braking to change of these parameters and the impact of time to change the boiling point of the brake fluid.
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Mortimer, Rudolf G. "Motorcyclists' Brake Operation, Motorcycle Brake Controls and a Case Study: The Need for Human Factors Engineering". Proceedings of the Human Factors and Ergonomics Society Annual Meeting 46, nr 10 (wrzesień 2002): 890–94. http://dx.doi.org/10.1177/154193120204601003.
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A survey was made of the braking techniques reportedly used by 180 motorcyclists in a variety of conditions. Overall, the motorcyclists indicated that they used both front and rear brakes in hard braking 75% of the time on dry pavement and 47% on wet, but in other conditions they mostly used the rear brake first or exclusively. That the rear brake is preferred is not surprising because of the design of the brake controls and other reasons. Reliance on the rear brake at the expense of the front wheel brake leads to reduced deceleration. A crash case study exemplifies the effect. Integrated brakes, in which each brake control simultaneously activates the brakes on the front and rear wheels, are indicated by good human factors design and by motorcyclist's braking performance and should improve safety, especially when the brakes incorporate anti-locking mechanisms
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Pradhan, Dr Swastik, Santhosh M, Palepu rithvik i Katkam Ravi Teja. "Modelling and analysis of ventilated disc Brakes using Creo and FEA software". International Journal for Research in Applied Science and Engineering Technology 10, nr 6 (30.06.2022): 1359–70. http://dx.doi.org/10.22214/ijraset.2022.43959.
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Abstract: An important part of a car's safety system is the brakes. Brakes are easily worn, leading to unpredictable disasters. To avoid this, ventilated disc brakes are used, which helps the brakes to work well in stressful conditions and high temperatures. The materials used play an important role in determining performance. The main objective of this research work is to analyze the current design and conduct a suitable brake rotor analysis to improve its performance. Existing brake disc designs are modeled in Creo and analyzed with software. The material grades used in this study were performed on stainless steel, grey cast iron, structural steel, and titanium alloy brake discs using the same brake disc design to determine the best grade. Keywords: ventilated disc brake, creo, thermal analysis, static analysis.
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Durali, Laaleh, Amir Khajepour i Soo Jeon. "Design and optimization of a cam-actuated electrohydraulic brake system". Proceedings of the Institution of Mechanical Engineers, Part D: Journal of Automobile Engineering 232, nr 7 (3.07.2017): 909–20. http://dx.doi.org/10.1177/0954407017713103.
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Although different types of brake-by-wire mechanism including electrohydraulic brakes, electromechanical brakes, electronic wedge brakes and distributed electrohydraulic brakes have been developed in the past two decades, there is still an increasing demand for further improvement and also for development of new brake mechanisms in the automotive industry because of the escalating requirements for higher safety and better performance. This paper proposes a novel brake-by-wire system based on the cam actuation mechanism. The proposed cam-actuated electrohydraulic brake system is a combination of an electrical component, a mechanical component and a hydraulic component. The unique feature of the proposed cam-actuated electrohydraulic brake system is that the characteristics of the motor torque amplification can be optimized by careful design of the cam shape. The overall structure of the cam-actuated electrohydraulic brake system is described, and the dynamic model of the system is developed. Optimum design of the cam-actuated electrohydraulic brake system is obtained by multi-objective optimization, and the obtained simulation results are discussed. The compactness and the self-contained characteristics of the design enable the brake system to be installed on each wheel, allowing fully independent control of each wheel for better stability control.
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Zhang, Hai Tao, Ying Jun Dai, Yu Jing Jia i Guang Zhen Cheng. "The Design of Disc Brake for Mine Hoist in Civil Engineering". Advanced Materials Research 568 (wrzesień 2012): 212–15. http://dx.doi.org/10.4028/www.scientific.net/amr.568.212.
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This article will describe the research status and the features of control system of the disc brakes of mine hoist. The disc brakes consist of body, outer cylinder, cylinder, piston, ring, disc springs, plunger, gate disk and other components. The disc brakes use the pre-load of disc springs to force the piston to move towards the brake disc, push the brake pads out, then the brake pads and drum brake disc contact and resulting in positive pressure, then the formation of friction produce a braking torque. When the brake system loose pads, the cylinder is filled with the pressure oil, which make the piston compresses the disc springs, and promote the brake pads to move back and then left brake disc, remove the braking force. The hydraulic circuit of the braking system chooses two-way parallel oil and four oil cylinder brake. A slip road set up a one-way throttle, making the slip road brake slightly delayed, which will achieve two stage braking and make work more stable. This disc brake is normally closed, which means when the hoist does not work, the brake is in the state of braking to prevent the occurrence of accidents. This brake is safe, reliable and sensitive in action. The materials of brake pads is rigid asbestos plastic, which have stable friction coefficient, good wear resistance, is not sensitive to the aqueous medium and salt spray,it has flexible installation location, and it is easy to use, adjust and maintain.
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Afnison, Wanda, Wagino Wagino, Nuzul Hidayat, Muslim Muslim i Masykur Masykur. "Analysis Thermal Pada Solid dan Ventilated Disk Brake Pada Mobil Hemat Energy Pagaruyuang Team UNP". Jurnal Mekanova: Mekanikal, Inovasi dan Teknologi 7, nr 1 (24.06.2021): 44. http://dx.doi.org/10.35308/jmkn.v7i1.3699.
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This study discusses the thermal analysis of the disc brakes used in UNP energy-efficient cars. There are three types of disc brake designs that are simulated, namely solid disc brake, circular hole ventilated and vane ventilated types. Using the finite element method, the three disc brake designs analyzed the characteristics of the heat received from the braking process. Disc brakes with better heat dissipation ability are the most suitable type to use. From the simulation results, the ventilated (circular hole) disc brakes have the best heat dissipation capability with a maximum temperature of 635,520 K, lower than the vane and solid types where the maximum is obtained. temperatures of 5700 K and 809.50 K . The vane type disc brake design is a disc brake design with the worst heat dissipation capability which has the highest final temperature of 809.50 K.Keywords—Thermal analysis, disk brake, heat, high efficiency vehicle
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Huang, Shan, Jiusheng Bao, Shirong Ge, Yan Yin i Tonggang Liu. "Design of a frictional–electromagnetic compound disk brake for automotives". Proceedings of the Institution of Mechanical Engineers, Part D: Journal of Automobile Engineering 234, nr 4 (15.07.2019): 1113–22. http://dx.doi.org/10.1177/0954407019864210.
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According to the disadvantages of serious wear and heat fade of friction pad in frequent and high speed braking of friction brakes, and the insufficient power of electromagnetic brakes in low speed braking, a novel frictional-electromagnetic compound disk brake which combines both of these two brake principles is proposed for automotives in this paper. The excitation coils are designed based on the Zhang Yicheng theory model, and the compound brake prototype is manufactured based on the self-made magnetic brake pads and existing automotive brakes. The magnetic field and dynamic of the brake are simulated by using COMSOL Multiphysics software. The frictional–electromagnetic compound brake tests are implemented on the reconstructive disk brake simulation test bench. The experimental results show that the friction braking torque accounts for more than 90% of the compound braking torque in the process of compound braking, and the trend of the change is the same as that of the compound braking torque. When the initial braking speed exceeds 75 km/h, the electromagnetic braking torque does not increase with the increase in speed, instead, it decreases slightly because of demagnetization. The designed frictional–electromagnetic compound disk brake has good braking performance.
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Deepa, N., Sanchayita Dasmunshi, Shubhangi Verma, Anurag Shukla i Sneha Nanda. "Brake failure detection and electronic auxiliary braking system". International Journal of Engineering & Technology 7, nr 2.8 (19.03.2018): 350. http://dx.doi.org/10.14419/ijet.v7i2.8.10439.
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Brakes are the integral part of a vehicle, which are used to reduce the speed of the car. Brake failure is one of the major problems, which lead to several accidents. Brake failure occurs due to brake lining fails, which leads to pressure loss. This mainly occurs in pneumatic brakes, which are used in most of the vehicles. The aim of our paper is to diagnose the faulty braking system and to enable the functioning of auxiliary braking or secondary brake system during brake failure. When the primary pneumatic brake fails the pressure sensor detects the brake failure and gives warning signal to the driver and also enables the auxiliary brake, which can be controlled by the driver manually through a manual control board. This braking system ensures the safety of the driver as well as the passengers without causing any damage to the vehicle.
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Seelam, Anil Babu, Nabil Ahmed Zakir Hussain i Sachidananda Hassan Krishanmurthy. "Design and analysis of disc brake system in high speed vehicles". International Journal for Simulation and Multidisciplinary Design Optimization 12 (2021): 19. http://dx.doi.org/10.1051/smdo/2021019.
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Brakes are the most important component of any automobile. Brakes provide the ability to reduce or bring automobile to a complete stop. The process of braking is usually achieved by applying pressure to the brake discs. The main objective of this research paper is to propose an appropriate design and to perform analysis of a suitable brake rotor to enhance the performance of the high-speed car. The design of the brake disc is modelled using Solid works and the analysis is carried out using Ansys software. The analysis has been conducted by considering stainless steel and grey cast iron using same brake rotor design so that optimal choice of brake disc can be considered. The analysis considered involves static structural analysis and steady state thermal analysis considering specific parameters on brake rotor to increase the life of brake rotor. From the analysis it is found that the performance and life of disc brake depends upon heat dissipation. From the analysis results it can be concluded that grey cast iron has performed better as compared to stainless steel as this material has anti-fade properties which improves the life of the brake rotor.
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Sampathkumar, M., A. Sakthivel, P. Tharun Prasad, S. Vinothkumar i R. Vinothkumar. "Design and fabrication of electromagnetic braking system for four wheeler". South Asian Journal of Engineering and Technology 8, nr 1 (8.02.2019): 1–3. http://dx.doi.org/10.26524/sajet190802.
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These brakes designed by controlling for equipment, automobiles and movers are suitable for AC&DC power supplies up to 12 v to 220 v and are suitable for wide range of drum sizes 10 to 380 mm dia these brakes are suitable with a rated torque ranging from 100kg-cm for the smallest brake up to 2000 kg-cm for a 380mm dia at 50% coil rating, the coil remains in circuit for a maximum 5 min out of every 10min. Since these brakes are closed position, the release of brake shoes is affected by energizing the electromagnetic coil which over comes the spring force and shoes are moved clear of drum by lever system so that the drum is free to rotate without any friction. When the power given to the electromagnetic coil the coil gets energized and in turns the plunger pulls down. The plunger in turn operates the arm of the brake and the brake opens. When specied brake drum both pin bush type and flexible geared type can be supplied along with the brakes.
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A.Pavan Kumar and Dr.D Venkata Rao, Shaik Chand Mabhu Subhani. "Structural and Thermal Analysis of Brake Drum". International Journal for Modern Trends in Science and Technology 6, nr 12 (3.12.2020): 8–15. http://dx.doi.org/10.46501/ijmtst061202.
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The brake drum is a specialized brake that uses the concept of friction to decelerate or to stop the vehicle. The deceleration is achieved by the assistance of the friction generated by a set of brake shoes or pads. During the brake operation heat is ejected out this causes damage to the brake. Disc (Rotor) brakes are exposed to large thermal stresses during routine braking and extraordinary thermal stresses during hard braking. To satisfy this condition the drum material should possess a high thermal conductivity, thermal capacity and high strength .The common material used for construction of brake drum is cast iron. The aim of the project is to design, model a disc. Modeling is done using catia. Structural and Thermal analysis is to be done on the drum brakes using four materials Stainless Steel, gray Cast iron, carbon carbon composite & aluminum metal matrix. The shoes of this kind of brake are contained within the drum and expand outwards when the brake is applied. Such kind of brakes is used in medium heavy-duty vehicles. Structural analysis is done on the drum brake to validate the strength of the drum brake and thermal analysis is done to analyze the thermal properties. Comparison can be done for deformation; stresses, temperature etc. form the three materials to check which material is best. Catia is a 3d modeling software widely used in the design process. ANSYS is general-purpose finite element analysis (FEA) software package. Finite Element Analysis is a numerical method of deconstructing a complex system into very small pieces (of user-designated size) called elements.
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Feier, Ioan, Joseph Way i Rob Redfield. "Bicycle Disc Brake Thermal Performance: Combining Dynamometer Tests, Bicycle Experiments, and Modeling". Proceedings 49, nr 1 (15.06.2020): 100. http://dx.doi.org/10.3390/proceedings2020049100.
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High-power bicycle disc braking can create excessive temperatures and boiling brake fluid, resulting in performance degradation and damage. The goal of this work is to understand brake friction performance and thermal behavior for bicycle disc brakes. A previously described disc braking dynamometer is used to assess brake pad performance of sintered metallic brake pads, organic brake pads, and ‘power’ organic pads in up to 400 W of braking power. The friction coefficient is found to be dependent on both temperature and normal force. Friction curve fits are provided for temperatures between 300 K and 550 K. Organic and ‘power’ organic pads are found to have similar behavior, and have higher friction coefficients compared to metallic pads. Further, brakes on an instrumented bicycle are tested in outdoor field trials during downhill descent. A MATLAB thermal model successfully predicts the downhill field brake disc temperatures when using the friction data curve fits.
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Liu, Xu Hui, Liang Yao Yu i Liang Xu Ma. "MR Based Brake-by-Wire System with Self-Energizing Capability". Advanced Materials Research 936 (czerwiec 2014): 2087–93. http://dx.doi.org/10.4028/www.scientific.net/amr.936.2087.
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Brake-by-wire system is a new concept of brake system using electromechanical actuators instead of conventional hydraulic actuators. It is more compact, more efficient and responses faster than traditional brake systems. Magneto-rheological (MR) fluid is widely used due to its outstanding properties. In this paper, an MR based Brake-by-wire system with self-energizing capability were proposed and designed. It combined a typical single-disk-type MR brake with a wedge mechanism for self-energizing purpose. According to the torque analysis of the proposed MR brakes, the brake torque was significantly amplified. This research work presented a promising brake actuator, which allows MR fluids to be applied in automotive Brake-by-wire systems.
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Shirose, Burhanuddin, Kunal Yadav, LS Meenatchi i K. Vedhanarayan. "Robotic arm for brake performance testing". Journal of Physics: Conference Series 2251, nr 1 (1.04.2022): 012002. http://dx.doi.org/10.1088/1742-6596/2251/1/012002.
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Abstract Bikes require their brakes to be tested. There are adequately defined conditions under which these tests need to be performed: the brake pedal has to be pressed by a constant force. This force varies depending on the standardized test, but the value remains constant under each standard. No bike brake is perfect and thus has imperfections like disc thickness variation and disc misalignment. These imperfections cause judder due to which force experienced by the brakes under a specific pedal position varies too. This can create errors in tests and thus needs to be overcome for proper performance testing of brakes. “Robotic arm for brake performance testing” provides an effective solution by constantly measuring the braking force and instantly moving the brake pedal to keep the braking force constant.
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Grygorcewicz, Paweł. "Results from Laboratory Tests of New Electric Brake Prototype". Journal of KONES 26, nr 3 (1.09.2019): 47–52. http://dx.doi.org/10.2478/kones-2019-0056.
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Abstract The main idea of this article was to compare the results of new design electric brake to the older version of hydraulic brake in laboratory tests. The energy of braking should be very similar due to the same mass of the airplane. That is why the laboratory tests of both brakes were took place in the same stand. Of course, the parameters were similar but not at all. The main idea was to create the solution, which could be used in vehicle like airplane. The electric brakes could replace traditional hydraulic brake solution. The results could be interesting for every researcher who is interested in brakes. Other important idea of this article was to describe the tests of new electric brake prototype. The purpose of the tests was to check designing of electric brakes. The electric brake prototype should ensure sufficient efficiency, safety, reliability and durability during braking, which is required in certification processes and is particularly important when researching innovative solutions. It was really important to verify the design and check the parameters. Of course, there is really important to remember that in every new type of the prototype solutions there are many pros and cons, which are typical only for considered design. Nowadays every electric brake design is different because there is a lot of new concept.
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Məhərrəm oğlu Əliyev, Ələsgər. "Analysis of braking systems of classic drilling". SCIENTIFIC WORK 65, nr 04 (21.04.2021): 6–11. http://dx.doi.org/10.36719/2663-4619/65/6-11.
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The lowering and lifting of the drill strings during drilling is carried out using winches. One of the main elements of the winches is the braking system. The braking system of the drawworks is designed for: keeping the drill string suspended; power absorption during the descent of the string to the length of one candle with the highest permissible speed and complete braking at the end of the descent; smooth feed of the drill string as the well deepens while drilling. Braking devices used in drilling machines and mechanisms are divided into main and auxiliary ones according to their purpose.The main ones are designed to stop machines and mechanisms and are activated at the end of the movement with long interruptions in work, while auxiliary ones are for long-term braking in order to reduce the speed of movement. The brakes of classic drill bits consist of a main working belt-molded brake, as well as an auxiliary brake consisting of electromagnetic or hydrodynamic brakes. Key words: belt-molded brake, hydrodynamic brake, electromagnetic brake, electromagnetic ferro-dust brakes
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Lapisa, Remon, Donny Fernandez, Claudio Tarihoran, Milana Milana, Ahmad Arif, Purwantono Purwantono i Jasman Jasman. "Experimental study of the effect of brake drum cooling grooves on motorcycle braking performance". EUREKA: Physics and Engineering, nr 3 (31.05.2022): 69–77. http://dx.doi.org/10.21303/2461-4262.2022.001983.
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Some important indicators in the braking system performance on a motorcycle are the braking temperature and stopping distance. High temperatures due to frictional heat in the drum brake can decrease the braking force and cause a slip. To improve braking performance, an effective strategy is needed to reduce the drum temperature and shorten the stopping distance. This study aims to analyze the effect of cooling grooves on the standard brake drum to decrease the drum brake temperature and the length of stopping distance. The measurements were compared to the standard drum brake as a reference, and two types of the modified ones to increase the braking performance by adding the slant-grooved and a straight grooved on brake drum. Braking is performed by providing a compressive load of two kg on the brake pedal for three cases of motorbike speed: 20, 40, and 60 km/hour. The results show that the brake drum with straight cooling grooves provides better braking performance compared to other drum brakes. For a speed of 60 km/h, the temperature of the straight grooved brake is 3.5 ºC. The stopping distance is 29.1 % shorter compared to the standard one. It shows that adding cooling grooves on drum brake can increase the effectiveness of motorcycle braking performance at various speeds. The results show that the brake drum with straight cooling grooves provides better braking performance compared to other drum brakes
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Shiao, Yaojung, i Mahendra Babu Kantipudi. "High torque density magnetorheological brake with multipole dual disc construction". Smart Materials and Structures 31, nr 4 (11.03.2022): 045022. http://dx.doi.org/10.1088/1361-665x/ac5860.
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Abstract This paper presents a magnetorheological (MR) brake with the intent of overcoming the problems of limited torque density and low manufacturability that conventional MR brakes come across. Firstly, the conceptual design of the proposed MR brake was finalized. High torque density was achieved by using the combined effect of the dual disc-type construction and multipole concept. High manufacturability was attained with a simple and lightweight mechanical construction. It was created with the major components, namely magnetically permeable stator cases, rotor discs, magnetic cores, winding coils, and MR fluid. The computer aided design (CAD) model and analytical models were also developed to study the performance of the proposed brake. Then, the dimensions of the brake were optimized through electromagnetic simulations. Further, the brake performance was simulated using a three-dimensional electromagnetic model. Finally, a prototype of the optimized MR brake was fabricated, and its performance was experimentally validated. It is clear from the computer simulations and experimental test results, that the proposed MR brake has achieved the objective. The maximum torque was 16.5 Nm, and the torque density of 79.3 Nm dm−3 was significantly higher than that of conventional MR brakes. This brake also exhibited a fairly rapid response with a response rate of 90 ms.
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Sohn, Jung Woo, Han Gyeol Gang i Seung-Bok Choi. "An experimental study on torque characteristics of magnetorheological brake with modified magnetic core shape". Advances in Mechanical Engineering 10, nr 1 (styczeń 2018): 168781401775222. http://dx.doi.org/10.1177/1687814017752222.
Pełny tekst źródłaStreszczenie:
In this article, a new type of magnetorheological brake is designed and its torque characteristics are investigated experimentally. The proposed magnetorheological brake consists of an outer housing, a rotating drum, magnetorheological fluid, and a copper wire coiled magnetic core to generate a magnetic field. At first, the structural configurations of the magnetorheological brakes are presented with conventional and modified magnetic core shape. To achieve enhanced braking torque under limited small size, a modified magnetic core shape is adopted in the proposed magnetorheological brake. After manufacturing the magnetorheological brakes and measurement of braking torque, it is verified that the proposed magnetorheological brake with modified magnetic core shape has improved braking torque compared to conventional-type magnetorheological brake. For the actuator application, the dynamic characteristics, such as rising time, settling time, and falling time, of the proposed magnetorheological brake is also experimentally evaluated by observing the step response. In addition, the torque tracking control performance is also investigated by adopting fuzzy–proportional–integral–derivative control algorithm for desired input of sinusoidal and multi-magnitude step input. It is demonstrated that the proposed magnetorheological brake can be successfully used as an actuator with limited small size.
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Siregar, Rolan, Mohammad Adhitya, Danardono A. Sumarsono, Nazaruddin Nazaruddin, Ghany Heryana, Sonki Prasetya i Fuad Zainuri. "Optimization of temperature measurement on the bus drum brake as a basis for developing brake fault signals". Eastern-European Journal of Enterprise Technologies 1, nr 1 (109) (19.02.2021): 13–19. http://dx.doi.org/10.15587/1729-4061.2021.224907.
Pełny tekst źródłaStreszczenie:
Brake failure is always possible due to several factors that are difficult to control, such as a slight leak in the brake hose due to an impact or a rat bite. In the latest research, the development of a brake performance detection tool has been started, but how to detect a brake temperature more efficiently on the brakes of large vehicles has not been specified. Given the significant impact of losses due to brake failure and accidents that are still occurring, this research plays an important role. It must be completed immediately so that accident cases can be reduced. The object of this research is where the position of the maximum brake temperature occurs? How to measure brake temperature is more practical? What sensor is optimal in detecting a brake temperature? The research method is carried out in a systematic stage that ends with an experimental method. This study indicates that the maximum temperature is relative to the entire friction area between the canvas and the drum brake. The most efficient sensor placement is in the hole in the drum brake cover so that installation is more practical and the brakes are not disturbed by the sensor’s presence. The optimal sensor is a thermocouple sensor because it is more stable to vibrations and more resistant to mud disturbances than infrared sensors. When using a thermocouple sensor, the temperature detection results must be corrected. The correction factor can be made with the equation y=10.3670+1.3205x–0.0003x2, where y is the actual temperature displayed, and x is the input temperature from the thermocouple sensor’s initial detection. Accurate brake temperature detection results will be developed as a signal for detecting brake faults in real-time to avoid brake failure. Finally, the safety of public transportation can be improved
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Jiang, Jun Sheng. "Analysis on Wet Multi-Disc Brake Based on ABAQUS". Advanced Materials Research 421 (grudzień 2011): 427–30. http://dx.doi.org/10.4028/www.scientific.net/amr.421.427.
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In this paper, take the wet multi-disc brake of underground engineering truck as research object, combined with the complex modal analysis theory and FEM, and establish the FEM model of the wet multi-disc brake based on ABAQUS. Through complex modal analyzing on the wet multi-disc brake, obtain the main factors of brake noise during braking and provide improved measures to decrease the brake noise combined with analysis results. It provides a theoretical basis in the design of wet multi-disc brakes and has a practical engineering significance.
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Mat Lazim, Ahmad Razimi, Mohd Kameil Abdul Hamid i Abd Rahim Abu Bakar. "Effects of Pad Surface Topography on Disc Brake Squeal". Applied Mechanics and Materials 165 (kwiecień 2012): 58–62. http://dx.doi.org/10.4028/www.scientific.net/amm.165.58.
Pełny tekst źródłaStreszczenie:
Brake squeal has always been a major NVH problem to many car makers due to significant number of warranty claims. Brake squeal is a high frequency noise (above 1 kHz) emanating from car disc brakes that get excited due to one or more mechanisms such as mode coupling, stick-slip, hammering and sprag-slip. This paper attempts to investigate the effects of brake pad surface topography on squeal generation. Two pairs of a non-asbestos organic (NAO) brake pad will be tested on a brake dynamometer test rig. Surface topography of the brake pad will be analyzed through microscopic techniques using energy dispersive X-ray analysis (EDX), and optical microscope.
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Nguyen, Ngoc Diep, Thang Le-Duc, Le Dai Hiep i Quoc Hung Nguyen. "Development of a new magnetorheological fluid–based brake with multiple coils placed on the side housings". Journal of Intelligent Material Systems and Structures 30, nr 5 (29.12.2018): 734–48. http://dx.doi.org/10.1177/1045389x18818385.
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In this research, a new configuration of magnetorheological fluid–based brake with multiple coils placed on each side of the brake housing (multiple side-coil magnetorheological fluid–based brake) is proposed, optimally designed, and evaluated. With this configuration, the multiple side-coil magnetorheological fluid–based brake is expected to provide higher braking torque and more compact size than the traditional magnetorheological fluid–based brake. After a brief introduction about the development of magnetorheological fluid–based brake, the configuration of multiple side-coil magnetorheological fluid–based brake is proposed. Braking torque of the proposed magnetorheological fluid–based brake is then analyzed based on the Bingham plastic rheological model of magnetorheological fluid. The optimization of the proposed multiple side-coil magnetorheological fluid–based brake, the magnetorheological fluid–based brake with one coil placed on each side of the brake housing (single side-coil magnetorheological fluid–based brake), and the conventional magnetorheological fluid–based brake is then performed considering maximum braking torque and mass of the brakes. Based on the optimal results, advanced performance characteristics of the proposed magnetorheological fluid–based brake are figured out. In addition, experimental works are conducted to validate the performance of the proposed multiple side-coil magnetorheological fluid–based brake.
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Barecki, Z., i S. F. Scieszka. "Some Factors Influencing Friction Brake Performance: Part 3—Computer Simulation of the Lining Wear Process in Friction Brakes". Journal of Mechanisms, Transmissions, and Automation in Design 111, nr 1 (1.03.1989): 13–18. http://dx.doi.org/10.1115/1.3258958.
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In this paper the simulative model of the friction lining wear process in a winding gear, post type, brake is presented. In the modelling procedure, the wear characteristics of the friction materials and the brake variables typical for winding brakes, for example, the elastic property of the brake elements were taken into consideration. The modelling of the friction lining wear process was used to predict associated changes in the pressure distribution, and other mechanical characteristics of the brake system.
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Scheibe, Robert R., i Per G. Reinhall. "Safety Monitoring of Air Brake Systems on Board Commercial Vehicles". Transportation Research Record: Journal of the Transportation Research Board 1560, nr 1 (styczeń 1996): 40–47. http://dx.doi.org/10.1177/0361198196156000107.
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Research is leading to development of an on-board, intelligent air brake warning device (IBWD) for commercial vehicles equipped with such brakes. Recent statistics show that a disturbing proportion of commercial vehicles are operating with brakes that are out of adjustment or otherwise improperly maintained. Air brake systems on multiaxle vehicles are particularly sensitive to brake adjustment and provide poor feedback of deteriorating performance to drivers. Currently, the only active warning is for low air pressure; drivers receive no information about the effectiveness of the total system. Recent improvements, including automatic slack adjusters and antilock brake systems, are not sufficient to ensure adequacy of brakes. IBWD performs an on-board, real-time assessment of vehicle brake performance through measurement of a relatively small number of parameters. It gives drivers adequate time for corrective action and provides maintenance personnel and authorities with valuable information for improved servicing and inspection activities. In addition to the safety benefits, IBWD will enhance commercial vehicle productivity by reducing unnecessary delays at inspection points and by boosting overall acceptance of other intelligent transportation system technologies. A discussion of IBWD design philosophy and methodology is presented. The measurable parameters of interest are discussed, along with how they will be monitored. Analysis and modeling of empirical data collected from an extensive full-scale vehicle test program are presented, along with techniques for deriving a brake assessment algorithm.
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Stefanovic, Slobodan, i Stefan Mladenovic. "ANALYSIS OF BRAKE SYSTEMS IN MOTOR VEHICLES USING PRACTICAL EXAMPLES FROM THE ASPECT OF THEIR DIAGNOSTICS". KNOWLEDGE - International Journal 54, nr 3 (30.09.2022): 505–11. http://dx.doi.org/10.35120/kij5403505s.
Pełny tekst źródłaStreszczenie:
The part of the braking system that has the task of transmitting the command activated by the driver to thebrakes is called the transmission mechanism. The transmission mechanism itself can be different depending on howit is constructed and conceptually executed. As for the conceptual solution, the question arises as to whether thetransmission method itself must be such that the driver's command is only transmitted to the brakes or the driver'scommand itself is handed over to a separate energy system. The energy system itself can be such that it additionallyhelps the activation of the brakes (servo brake force boosters) or completely takes over the activation of the brakes,with the creation of a certain braking force on the wheels, and these are the so-called mechanisms with full servoaction. Today we have the following transmission mechanisms in use: Mechanical transmission, hydraulic with orwithout servo amplification, hydraulic with full servo action, pneumatic with full servo action, hydro-pneumaticwith servo amplification or with full servo action. The very choice of these systems depends on a large number offactors, but the main one is - how much energy must be delivered to the brakes. Each of these systems is explainedseparately in the paper. A mechanical transmission mechanism is a system that does not have any additional servoamplification, but the command of the driver or the person operating the machine is directly transmitted to thebrakes. Based on this, we can conclude that the application of this transmission mechanism in brake systems is quitelimited. Today, this transmission mechanism is only used as a service brake on some slower trucks and tractors. Thehydraulic transmission mechanism is the system that is most common in brake systems of passenger, light cargo anddelivery vehicles. In the case of vehicles weighing up to 1000 kg, the driver alone is sufficient to develop thenecessary energy for braking, so it is not necessary to additionally support the braking force with servo boosters. Butthat's why smaller trucks and delivery vehicles need additional help from a servo booster to activate the brakingforce. Servo amplifiers have become an integral part of the equipment in passenger vehicles primarily due to thesafety, security and comfort of passengers. In contrast to the mechanical transmission, this system is morecomplicated in terms of performance and its operation is based on the transmission of pressure through the brakefluid from the main brake cylinder to the brake cylinder in the brakes. The pressure created by the brake fluid actson the pistons in the cylinder itself and in this way force is created and the brakes are activated. The main advantageof this system is the very safety and safer braking, because with the hydraulic system it is possible to make adistribution in several independent branches to the cylinders on the brakes, and this is one of the basic satisfactoryrequirements in the ECE regulation that the brakes must also have an auxiliary braking system in case dismissal ofthe principal. The system itself consists of: the pedal, which is activated by pressing the foot on the pedal itself, themain brake cylinder, the distribution system, the working brake cylinders in the brakes and the brake itself.
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Podryhalo, Mykhailo, Andrei Kashkanov, Vitalii Shein, Oleksii Kasianenko i Valerii Uzhyk. "METHOD FOR PREDICTION OF DURABILITY OF FRICTION LININGS OF TRACTOR BRAKES". Bulletin of the National Technical University «KhPI». Series: Automobile and Tractor Construction, nr 2 (21.06.2022): 79–90. http://dx.doi.org/10.20998/2078-6840.2021.2.09.
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The paper presents the results of a research on the creation of a methodology for predicting the durability of friction linings of tractor brake mechanisms at the design stage. Not only an increase in engine power and tractor weight is taken into account, but also the installation of more advanced brake mechanisms. Thanks to the developed method for predicting the durability of the friction linings of tractor brake mechanisms, the use of unified disc brakes is justified.
To solve the problem, the similarity theory was used, in which the most intense loading mode of the tractor brake mechanisms was modeled. As an indicator, the maximum work performed by the brakes until the friction linings are completely worn out was used. The results of estimating the resource of the friction linings of the tractor brake mechanisms under the most intense loading conditions were compared with the results of the calculation under the actual loading conditions.
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Listiyono, Listiyono, Nurhadi Nurhadi i Khambali Khambali. "Compressor Air Pressure and Brake Shield Distance Brake to Braking Accuracy on Brakes Antilock Braking System". Asian Journal Science and Engineering 1, nr 1 (30.06.2022): 37. http://dx.doi.org/10.51278/ajse.v1i1.419.
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The development of automotive technology to date is very fast. In the city, it is almost rare to find conventional cars. Most are already using modern technology. The hallmark of modern cars is that they are not fully mechanical. Already combined with several electric and pneumatic tools. Until now the development in the field of chassis is endless. Its initial development began with the discovery of ABS (Anti Lock Brake System) brakes. Basically, ABS is followed by supporting components such as EBD, ESP, and so on.All of this is actually inseparable from the main function of braking. Namely so that the car can run well,, deceleration and stop as desired appropriately. The parts of the brakes that are most influential are the brake shoes and discs and the compressed air from the brakes. Also the most influential accuracy is the distance of the brake shroud. Therefore, in this study the aims of 1. To find the effect of pressure and brake shroud distance. 2. What is the minimum air pressure and brake shroud for the brakes to work properly (grip). This research uses experimental design method. The data is processed with the Minitab program. Data processing shows that: 1. The braking speed is influenced by the amount of compressed air pressure. Partially the distance of the brake shroud does not affect the braking speed. But the interaction of pressure and shroud distance has an effect on braking speed. 2. Air pressure that can be used as a fast ABS braking process is 3.75 – 4.25 (bar) with a shroud distance of 5 (mm).
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Li, Wei, Hong Yu Zheng i Chang Fu Zong. "A Brake Pad Wear Control Algorithm for Electronic Brake System". Advanced Materials Research 694-697 (maj 2013): 2099–105. http://dx.doi.org/10.4028/www.scientific.net/amr.694-697.2099.
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A brake pad wear control algorithm used under uncritical braking conditions is proposed to reduce the difference in brake pad wear between the front and rear axles caused by the difference in braking force and the type of brake. The algorithm regulates the distribution of braking force within the limits of certain braking regulations according to the wear conditions of the brake pads while deceleration control still functions properly. Computer co-simulations of braking with Trucksim and Matlab/Simulink was performed in which vehicle models with equal brake pad wear, greater wear on the front axle and greater wear on the rear axle were used. The results show that the difference in brake pad wear between the front and rear axles can be reduced by distributing the braking force according to the wear conditions of the brakes when braking uncritically to reduce the time and cost needed in repair and maintenance.
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Wadile, Ratnajeet. "Thermal Analysis of a Disc". International Journal for Research in Applied Science and Engineering Technology 9, nr 10 (31.10.2021): 1910–15. http://dx.doi.org/10.22214/ijraset.2021.38476.
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Abstract: The disk brakes are special mechanized parts in a vehicle attached with the tires to help reduce the velocity of the vehicle. As the brake pads caused friction with the disc brakes, there is a temperature rise. Due to this there are great chances of disc brake’s failure if temperature rises above some permissible limit. Solidworks and ANSYS are the design and analysis tools which are used to accomplish this project. The disc brake was designed using Solidworks and it was analysed in ANSYS workbench. The main aim of this project is to analyse two-disc brakes manufactured with different materials to compare their properties and select one with most benefits. Keywords: ANSYS, FEA, Disc brake, Thermal analysis, braking system, Radiation.
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Krivosheya, Yuriy Vladimirovich, i Tatyana Leonidovna Ripol-Saragosi. "Construct and energy reserves improvement of exploitative properties rail friction brake". Transport of the Urals, nr 2 (2020): 26–30. http://dx.doi.org/10.20291/1815-9400-2020-2-26-30.
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The paper gives an assessment of the design and energy reserves for improving the operational properties of the railway friction brake under the existing mass-dimensional restrictions and the growth of braking energy. The criterion for assessing the operational properties of the friction brake is the friction coefficient and contact energy load. The results of experimental studies of the relationship between the frictional characteristics of the disc brake and the affecting structural and loadspeed factors are presented. Design options for railway friction brakes are proposed that provide improved performance. A comparative analytical assessment of the contact energy load of new friction brake and classic disc brake options has been performed.
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Yang, Cheng Hui. "A New Mathematical Model of Brake Test Stand Control System". Advanced Materials Research 562-564 (sierpień 2012): 975–78. http://dx.doi.org/10.4028/www.scientific.net/amr.562-564.975.
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All of the performances of the car, break performance is one of the most important. In the stage of automotive design, road tests usually are not available, only special brake tests are used to simulate the test. Using brake tester is a good measure to decide the vehicle braking performance. To carry out the brakes test and to explore inertia, it can better simulate the actual use of the brake mode and environmental conditions, a more realistic response to brake performance, not only brake to improve the level of R & D to enhance the braking technology, but also can improve brake testing technology to improve the design level test bench, the most critical is a good control analysis of the mathematical modeling of the brake product development, quality control, and vehicle braking performance are very important. Based on the data calculation and analysis, model, and the control algorithm, obtained reasonable control of the brake test bench mathematical modeling, and the method to do the appropriate improvements.
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Dias, Anderson L., Rômulo dN Rodrigues, Roberto dA Bezerra i Pierre Lamary. "Automotive simplex and duplex drum brake squeal analysis using the finite element method". Noise & Vibration Worldwide 53, nr 1-2 (styczeń 2022): 49–64. http://dx.doi.org/10.1177/09574565211052692.
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Despite the fact that disk brakes are used on almost entire mass produced vehicle, drum brakes are still applied on light-, medium-, and heavy-duty vehicles. However, both exhibit a high level of brake noises in which squeal is the most uncomfortable and one of the reasons behind high warranty costs that concern the automotive industry. Hence, the development of prediction methods and models of brake noise have prompted significant efforts. This study intends to analyze two types of drum brakes of a commercial automotive application. Their parametric finite element model comprises drum, shoes, and frictional linings and are submitted to a computational process that includes static calculations of the system under the brake forces to get a pre-stress state around which is computed the complex eigenvalues of the system which characterize their stability. These calculations indicate the unstable frequencies of the entire system. After the design of experiments (DOE) process, the influence of drum brake parameters on system stability can be seen. The friction coefficient and Young’s modulus presented a strong correlation with squeal incidence. At the end is presented a comparison and the optimal material parameters to decrease squeal noise occurrence of these brakes.
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Sawczuk, Wojciech, Agnieszka Merkisz-Guranowska, Armando-Miguel Rilo Cañás i Sławomir Kołodziejski. "New approach to brake pad wear modelling based on test stand friction-mechanical investigations". Eksploatacja i Niezawodnosc - Maintenance and Reliability 24, nr 3 (26.05.2022): 419–26. http://dx.doi.org/10.17531/ein.2022.3.3.
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The paper presents the results of investigations of a railway disc brake system related to the mass wear of its brake pads. The tests were carried out on a certified brake stand designed to determine the friction-mechanical characteristics of the brakes. The test stand was additionally equipped with a thermographic camera to observe the contact points of the brake pads with the disc. Particular attention was drawn to investigating the impact on the mass wear of the brake pads of such parameters of the braking process as contact surface of the brake pad with the rotor, thickness of the brake pads as the indicator of their initial wear, clamping force of the pads against the rotor, rail vehicle mass to be decelerated, and speed, at which the deceleration begins. The scientific aim of the paper is to present the relations between the mass wear of the brake pads and the quantities that characterize the braking process. A regression model was determined to estimate the wear of the brake pads based on a single braking process with the preset input quantities.
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Tian, Feng, Jinfeng Zhu i Zhenshe Zhang. "Design of a Drum Brake Turnover Machine". Journal of Physics: Conference Series 2417, nr 1 (1.12.2022): 012003. http://dx.doi.org/10.1088/1742-6596/2417/1/012003.
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In order to meet the demand of turning over brakes in an automatic assembly line of drum brakes, a drum brake turnover machine is designed. SolidWorks software is used to complete the three-dimensional modeling of the mechanical structure of the whole device; The control system of the drum brake turnover machine based on Schneider M241 PLC is designed, and the AC servo system control based on CANopen BUS is realized. The precise control of the position of reclaiming, overturning, discharging and turning angle of the drum brake is achieved. The engineering application results show that the equipment has a high degree of automation, stable operation, and good economy.
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Newase, Srushti. "Thermal Analysis of Disc Brake System". International Journal for Research in Applied Science and Engineering Technology 9, nr 8 (31.08.2021): 1819–26. http://dx.doi.org/10.22214/ijraset.2021.37662.
Pełny tekst źródłaStreszczenie:
Abstract: Brakes are one of the most significant safety systems in an automobile. In the braking process, the rotor will be exposed to large stresses which result in surface cracking, overheating of brake fluid, seals and other components. Therefore one of the main tasks of the braking system is to reduce the surface temperature of the brake rotor. This can be achieved by choosing the right material which will undergo the least thermal stresses. In this project, thermal analysis for vented disc brake rotor of Mahindra Bolero’s done, for providing an efficient material for disc brake rotor and brake pads which can dissipate heat generated during braking at faster rate and also being structurally safe. Keywords: Braking system, Disc Brake Rotor, Thermal, Structural Analysis, CATIA V5, ANSYS WORKBENCH
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Fu, Chuan Qi, Zhou Wang, Bin Li i Chi Yu. "The Dynamics Simulation of Braking Process on Automobile Disc Brake". Advanced Materials Research 139-141 (październik 2010): 2658–61. http://dx.doi.org/10.4028/www.scientific.net/amr.139-141.2658.
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For a certain type of automobile disc brakes, brake discs and friction linings were modeled by Pro/E. The dynamics simulations of braking process on disc brake were performed by the frictional contact algorithm and nonlinear finite element method. Distribution of stress, strain and displacement on the brake parts were investigated with different initial velocity. Analysis results shown that redistributions of stress and strain had occurred on the face of brake disc and friction linings in braking process. Meanwhile, the increased initial velocity resulted in increased stress and stain. Besides the stress concentrations appeared in brake disc role and friction lining corners at the beginning of braking, however, stress and stain became uniform along the braking. Analysis results provided the research of the optimum design and testing of disc brake with theoretic gist. And some improvement measures to the structure of disc brake were proposed.
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Zhao, Fang, Mu Yi Lin i Zhun Wang. "On Hydraulic Brake System Using Bench Experiments for Off-Road Vehicles". Advanced Materials Research 588-589 (listopad 2012): 327–30. http://dx.doi.org/10.4028/www.scientific.net/amr.588-589.327.
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The full power hydraulic brake system has several advantages over traditional brake actuation systems. These systems are capable of supplying fluid to a range of very small and large volume service brakes with actuation that is faster than air/hydraulic brake systems. Implementation of full power hydraulic brake system in off-road vehicles calls for good understanding of its dynamic characteristics. In this paper, we consider the problem of dynamic modeling of the brake system and develop a dynamic model for a hydraulic brake valve. First, the dynamic characteristics of full power hydraulic brake system are analyzed theoretically. The effects of varying design parameters (brake valve, accumulator and so on) and the different operating conditions are then analyzed. Second, we investigate the dynamic characteristics of a full power hydraulic brake system using a test bench, which is a loader brake system specifically designed for one construction Machinery Company. Finally, based on the experimental results, the mathematical models are amended and verified. The result shows that the model-calculated data agree well with tested data. The dynamic behavior of hydraulic valve can be well predicted with the model. The simplified models can be applied to the studies of full power hydraulic brake system dynamics.
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Sawczuk, Wojciech. "The Application of Vibration Accelerations in the Assessment of Average Friction Coefficient of a Railway Brake Disc". Measurement Science Review 17, nr 3 (1.06.2017): 125–34. http://dx.doi.org/10.1515/msr-2017-0016.
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AbstractDue to their wide range of friction characteristics resulting from the application of different friction materials and good heat dissipation conditions, railway disc brakes have long replaced block brakes in many rail vehicles. A block brake still remains in use, however, in low speed cargo trains. The paper presents the assessment of the braking process through the analysis of vibrations generated by the components of the brake system during braking. It presents a possibility of a wider application of vibroacoustic diagnostics (VA), which aside from the assessment of technical conditions (wear of brake pads) also enables the determination of the changes of the average friction coefficient as a function of the braking onset speed. Vibration signals of XYZ were measured and analyzed. The analysis of the results has shown that there is a relation between the values of the point measures and the wear of the brake pads.
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Dammerer, Dietmar, Cornelia Waidmann, Dennis G. Huber, Martin Krismer, Christian Haid i Michael C. Liebensteiner. "Effect of hip braces on brake response time: Repeated measures designed study". Prosthetics and Orthotics International 41, nr 4 (18.04.2016): 373–78. http://dx.doi.org/10.1177/0309364616640925.
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Background:The question whether or not a patient with a hip brace should drive a car is of obvious importance because the advice given to patients to resume driving is often anecdotal as few scientific data are available on this specific subject.Objectives:To assess driving ability (brake response time) with commonly used hip braces.Study design:Repeated measures design.Methods:Brake response time was assessed under six conditions: (1) without a brace (control), (2) with a typical postoperative hip brace with adjustable range of motion and the settings: unrestricted, (3) flexion limited to 70°, (4) extension blocked at 20° hip flexion, (5) both flexion and extension limited (20°/70°) and (6) an elastic hip bandage. Brake response time was assessed using a custom-made driving simulator as used in previous studies. The participants were a convenience sample of able-bodied participants.Results:A total of 70 participants (35 women and 35 men) participated in our study. Mean age was 31.1 (standard deviation: 10.6; range: 21.7–66.4) years. A significant within-subject effect for brake response time was found ( p = 0.009), but subsequent post hoc analyses revealed no significant differences between control and the other settings.Conclusion:Based on our findings, it does not seem mandatory to recommend driving abstinence for patients wearing a hip orthosis. We suggest that our results be interpreted with caution, because (1) an underlying pathological hip condition needs to be considered, (2) the ability to drive a car safely is multifactorial and brake response time is only one component thereof and (3) brake response time measurements were performed only with healthy participants.Clinical relevanceHip braces are used in the context of joint-preserving and prosthetic surgery of the hip. Therefore, clinicians are confronted with the question whether to allow driving a car with the respective hip brace or not. Our data suggest that hip braces do not impair brake response time.
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Kanaev, Andrey, Maria Sakharova i Michail M. Lukichev. "Approach for developing the plan of restoration of data communication network within the decision support intelligent system by using the precedent-based recovery method". Bulletin of scientific research results, nr 1 (20.03.2016): 46–56. http://dx.doi.org/10.20295/2223-9987-2016-1-46-56.
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Objective: To define the reasons, that prevent the implementation of electrical brake for multiple unit rolling stock (MVPS) with asynchronous traction drive as an automatic brake (emergency brakes). To find the method for eliminating of found reasons. To determine, using mathematical simulation, the time indexes of traction drive readiness to the electrical braking in case of no voltage in catenary system. Methods: Mathematical model of traction drive is built in Matlab Simulink software. By using this model the empirical relations of the time from the moment of command input, made by the control system, to start an emergency braking, to the moment of charging of input capacitors to nominal voltage (in case of no voltage in catenary system) from the train speed and equivalent resistance of stator circuit were obtained. Results: The problems, preventing the implementation of electrical brake for MVPS as an automatic brakes, are examined. The methods of solving these problems are suggested. By using the mathematical model the principal possibility of suggested methods is presented, as well as the estimation of the time of traction drive preparing for readiness for braking, depending on the train speed and equivalent resistance of stator circuit. Also, the engineering solutions, are found, that allow to implement the electrical brake for multiple unit rolling stock as an automatic one. Practical importance: Electrical for brake multiple unit rolling stock with asynchronous traction drive has several benefits in comparison with the pneumatic brake. It provides smaller braking distance, not influenced by low temperatures and provides better resistance for sliding and skidding. Implementation of electrical brakes for multiple unit rolling stock in the function of automatic brake will positively influence on the safety of operation and will allow to increase the operating speed of multiple unit rolling stock.
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Aleksandrov, Artem. "Method of implementation of electrical brake of electric trains with asynchronous traction drive in the function of automatic brake". Bulletin of scientific research results, nr 1 (20.03.2016): 5–17. http://dx.doi.org/10.20295/2223-9987-2016-1-5-17.
Pełny tekst źródłaStreszczenie:
Objective: To define the reasons, that prevent the implementation of electrical brake for multiple unit rolling stock (MVPS) with asynchronous traction drive as an automatic brake (emergency brakes). To find the method for eliminating of found reasons. To determine, using mathematical simulation, the time indexes of traction drive readiness to the electrical braking in case of no voltage in catenary system. Methods: Mathematical model of traction drive is built in Matlab Simulink software. By using this model the empirical relations of the time from the moment of command input, made by the control system, to start an emergency braking, to the moment of charging of input capacitors to nominal voltage (in case of no voltage in catenary system) from the train speed and equivalent resistance of stator circuit were obtained. Results: The problems, preventing the implementation of electrical brake for MVPS as an automatic brakes, are examined. The methods of solving these problems are suggested. By using the mathematical model the principal possibility of suggested methods is presented, as well as the estimation of the time of traction drive preparing for readiness for braking, depending on the train speed and equivalent resistance of stator circuit. Also, the engineering solutions, are found, that allow to implement the electrical brake for multiple unit rolling stock as an automatic one. Practical importance: Electrical for brake multiple unit rolling stock with asynchronous traction drive has several benefits in comparison with the pneumatic brake. It provides smaller braking distance, not influenced by low temperatures and provides better resistance for sliding and skidding. Implementation of electrical brakes for multiple unit rolling stock in the function of automatic brake will positively influence on the safety of operation and will allow to increase the operating speed of multiple unit rolling stock.
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Shiao, Yaojung, Quang-Anh Nguyen i Jhe-Wei Lin. "A Study of Novel Hybrid Antilock Braking System Employing Magnetorheological Brake". Advances in Mechanical Engineering 6 (1.01.2014): 617584. http://dx.doi.org/10.1155/2014/617584.
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A novel hybrid antilock braking system (ABS) with the combination of auxiliary brake and a multipole magnetorheological (MR) brake was proposed in this paper. The MR brake with innovative operation concept can replace existed hydraulic brake system or works as an auxiliary brake. Two simulation models of the MR brakes, inner rotor and outer rotor structures, have been built. The outer rotor design was chosen due to its better braking performance and suitable mechanism for using on motorcycle. After that, motorcycle simulation software was employed to validate the hybrid ABS system under appropriated working condition. Two controllers, the ordinary and self-organizing fuzzy logic controllers (FLC and SOFLC), were evaluated on ABS performance to pick the suitable one. Simulation results confirm the more adaptations to different road conditions of the SOFLC with 18% higher brake performance compared to ones of ordinary FLC. Brake performance can increase 12% more with the combination of SOFLC and road condition estimator (RCE). It is concluded that this hybrid ABS is feasible for actual application by effectively improving the brake performance for ensuring driving stability.