Articoli di riviste: "Disc brakes"

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Wadile, Ratnajeet. "Thermal Analysis of a Disc". International Journal for Research in Applied Science and Engineering Technology 9, n. 10 (31 ottobre 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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Pradhan, Dr Swastik, Santhosh M, Palepu rithvik e 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, n. 6 (30 giugno 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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Sawczuk, Wojciech, Armando Miguel Rilo Cañás, Dariusz Ulbrich e Jakub Kowalczyk. "Modeling the Average and Instantaneous Friction Coefficient of a Disc Brake on the Basis of Bench Tests". Materials 14, n. 16 (23 agosto 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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Afnison, Wanda, Wagino Wagino, Nuzul Hidayat, Muslim Muslim e Masykur Masykur. "Analysis Thermal Pada Solid dan Ventilated Disk Brake Pada Mobil Hemat Energy Pagaruyuang Team UNP". Jurnal Mekanova: Mekanikal, Inovasi dan Teknologi 7, n. 1 (24 giugno 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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Kristyawan, Yudi, e Muchammad Asro Rofi’i. "Early Detection of Overheating in Motorcycle Disc Brakes Based on Arduino". Inform : Jurnal Ilmiah Bidang Teknologi Informasi dan Komunikasi 6, n. 1 (31 gennaio 2021): 21–27. http://dx.doi.org/10.25139/inform.v6i1.3348.

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The braking system is very important on a motorcycle. The primary function of the braking system is to slow down and even stop the motorcycle. The braking system using disc brakes on motorcycles is commonly used today, especially on automatic transmission motorcycles. One of the disadvantages of disc brakes is the heat caused by the disc's friction with the brake pads if you apply continuous braking. This continuous braking is often done by a motor rider when crossing downhill roads in mountainous areas. Excessive heat in the disc brakes causes the brake fluid to boil, resulting in air bubbles resulting in braking failure. The failure of the braking system on a motorcycle is hazardous for the rider and others. The experimental method detects braking system failure by catching the disc brake's temperature with a touchless temperature sensor, MLX90614. Temperature detection is processed with Arduino as a control, and the temperature is displayed on the LCD. If the disc brake temperature is above 200oC, a buzzer is activated as a warning to the driver. The test results show that the system can display a temperature reading on the LCD lower than the thermometer gun, with the most inferior reading difference of 0.2oC and the highest 0.4oC. The system can also display notifications to users on disc brake temperatures above 200oC, namely at temperatures of 211.1oC, 224.3oC, and 237.5oC, which were achieved at 200, 225, and 250 seconds.

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García-León, R. A., N. Afanador-García e J. A. Gómez-Camperos. "Mechanical and Dynamic Maps of Disc Brakes under Different Operating Conditions". Fluids 6, n. 10 (13 ottobre 2021): 363. http://dx.doi.org/10.3390/fluids6100363.

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The operating conditions during the braking process in an automobile affect the tribological contact between the pad and disc brake, thus, influencing the times and distances of braking and, in a more significant way, the safety of the braking process. This mathematical work aimed to provide a general visualization of the disc brake’s mechanical, dynamic, and thermal behavior under different operating conditions through 2D maps of the power dissipated, braking time, and braking distance of a disc brake with a ventilation blade N- 38 type. However, the dissipated energy on the disc brake in terms of temperature was analyzed considering Newton’s cooling law and mathematical calculations through classical theories of the dynamic and mechanical behavior of the disc brakes. For this purpose, the Response Surface Methodology (RSM) and Distance Weighted Least Squares (DWLS) fitting model considered different operating conditions of the disc brake. The results demonstrate that the disc brakes can be used effectively in severe operational requirements with a speed of 100 km/h and an ambient temperature of 27 °C, without affecting the occupant’s safety or the braking system and the pad. For the different conditions evaluated, the instantaneous temperature reaches values of 182.48 and 82.94 °C, where the high value was found for a total deceleration to 100 km/h to 0, which represent a total braking distance of around 44.20 to 114.96 m depending on the inclination angle (θ). Furthermore, the energy dissipation in the disc brakes depends strongly on the disc, blades and pad geometry, the type of material, parameters, and the vehicle operating conditions, as can be verified with mathematical calculation to validate the contribution of the effectiveness of the braking process during its real operation.

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7

Yin, Yan, Jiusheng Bao, Jinge Liu, Chaoxun Guo, Tonggang Liu e Yangyang Ji. "Braking performance of a novel frictional-magnetic compound disc brake for automobiles". Proceedings of the Institution of Mechanical Engineers, Part D: Journal of Automobile Engineering 233, n. 10 (3 agosto 2018): 2443–54. http://dx.doi.org/10.1177/0954407018791056.

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Disc brakes have been applied in various automobiles widely and their braking performance has vitally important effects on the safe operation of automobiles. Although numerous researches have been conducted to find out the influential law and mechanism of working condition parameters like braking pressure, initial braking speed, and interface temperature on braking performance of disc brakes, the influence of magnetic field is seldom taken into consideration. In this paper, based on the novel automotive frictional-magnetic compound disc brake, the influential law of magnetic field on braking performance was investigated deeply. First, braking simulation tests of disc brakes were carried out, and then dynamic variation laws and mechanisms of braking torque and interface temperature were discussed. Furthermore, some parameters including average braking torque, trend coefficient and fluctuation coefficient of braking torque, average temperature, maximum temperature rise, and the time corresponding to the maximum temperature rise were extracted to characterize the braking performance of disc brakes. Finally, the influential law and mechanism of excitation voltage on braking performance were analyzed through braking simulation tests and surface topography analysis of friction material. It is concluded that the performance of frictional-magnetic compound disc brake is prior to common brake. Magnetic field is greatly beneficial for improving the braking performance of frictional-magnetic compound disc brake.

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Chen, Dong Fa, Li Ma, Xue Xun Guo e Qi Zhang. "Parametric FEM Analysis of Disc Brake". Applied Mechanics and Materials 483 (dicembre 2013): 199–202. http://dx.doi.org/10.4028/www.scientific.net/amm.483.199.

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A parametric FEM analysis method is introduced for the design of disc brakes. The basic process of parametric FEM modeling is summarized, the FEM model of disc brakes is established. Finally, the parametric FEM strength and stiffness analysis are conducted for the typical disc brake assembly.

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Zhang, Hai Tao, Ying Jun Dai, Yu Jing Jia e Guang Zhen Cheng. "The Design of Disc Brake for Mine Hoist in Civil Engineering". Advanced Materials Research 568 (settembre 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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10

Wen, Min. "An Analysis of the Coupling Between Temperature and Thermal Stress of Disc Brakes Based on Finite Element". International Journal of Heat and Technology 39, n. 6 (31 dicembre 2021): 1819–27. http://dx.doi.org/10.18280/ijht.390616.

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Disc brakes have been more widely used in recent years due to its many merits such as fast heat absorption and dissipation, and resistance to water fade. Since it’s difficult to describe the failure of brakes under complex working conditions in only a few times of thermal-structural coupling simulations, this paper analyzed the coupling between temperature and thermal stress of disc brakes under multiple continuous braking conditions. At first, a 3D model of bus disc brake was built in ABAQUS, and its braking motion and dynamic parameters, heat flux density, convective heat dissipation coefficient, heat flux distribution coefficient, and other thermodynamic parameters were calculated. Then, the numerical simulation of the temperature field of disc brake and the coupling analysis of thermal stress under different braking conditions were completed. At last, experimental results gave the analysis results of the temperature distribution characteristics of brake disc surface, and the comparison and demonstration of the finite element analysis were conducted.

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Seelam, Anil Babu, Nabil Ahmed Zakir Hussain e 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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Cui, Shi Hai, Jian Yuan e Hai Yan Li. "The Thermo-Mechanical Coupling Analysis of SiCp/A356 Composites Brake Disc of a Passenger Car". Advanced Materials Research 750-752 (agosto 2013): 28–32. http://dx.doi.org/10.4028/www.scientific.net/amr.750-752.28.

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The thermo-mechanical coupling finite element models of disc brakes made of aluminum metal matrix composites and cast iron for a passenger car under different emergency braking conditions were deveoped. And the braking process for brake disc was simulated by using finite element method. By analyzing distributions of the temperature field and stress field of the two brake discs with different thickness under emergency braking conditions, the weight reduction of the brake discs by using aluminum metal matrix composites substrate for cast irons was discussed and the simulation resusts showed that brake discs made of aluminum metal matrix composties can be used for passenger cars.

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13

Hesse, David, Christopher Hamatschek, Klaus Augsburg, Thomas Weigelt, Alexander Prahst e Sebastian Gramstat. "Testing of Alternative Disc Brakes and Friction Materials Regarding Brake Wear Particle Emissions and Temperature Behavior". Atmosphere 12, n. 4 (29 marzo 2021): 436. http://dx.doi.org/10.3390/atmos12040436.

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In this study, different disc brakes and friction materials are evaluated with respect to particle emission output and characteristic features are derived. The measurements take place on an inertia dynamometer using a constant volume sampling system. Brake wear particle emission factors of different disc concepts in different sizes are determined and compared, using a grey cast iron disc, a tungsten carbide-coated disc and a carbon ceramic disc. The brakes were tested over a section (trip #10) novel test cycle developed from the database of the worldwide harmonized Light-Duty vehicles Test Procedure (WLTP). First, brake emission factors were determined along the bedding process using a series of trip-10 tests. The tests were performed starting from unconditioned pads, to characterize the evolution of emissions until their stabilization. In addition to number- and mass-related emission factors (PM2.5–PM10), the particle size distribution was determined. Another focus was the evaluation of temperature ranges and the associated challenges in the use of temperature readings in a potential regulation of brake wear particle emissions. The results illustrate the challenges associated with establishing a universal bedding procedure and using disc temperature measurements for the control of a representative braking procedure. Using tungsten carbide coated discs and carbon ceramic discs, emission reduction potentials of up to 70% (PM10) could be demonstrated along the WLTP brake cycle. The reduction potential is primarily the result of the high wear resistance of the disc, but is additionally influenced by the pad composition and the temperature in the friction contact area.

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Fu, Chuan Qi, Zhou Wang, Bin Li e Chi Yu. "The Dynamics Simulation of Braking Process on Automobile Disc Brake". Advanced Materials Research 139-141 (ottobre 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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Shirose, Burhanuddin, Kunal Yadav, LS Meenatchi e K. Vedhanarayan. "Robotic arm for brake performance testing". Journal of Physics: Conference Series 2251, n. 1 (1 aprile 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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Feier, Ioan, Joseph Way e Rob Redfield. "Bicycle Disc Brake Thermal Performance: Combining Dynamometer Tests, Bicycle Experiments, and Modeling". Proceedings 49, n. 1 (15 giugno 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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Pawar, Abhijeet Vasant. "Design and Development of Braking and Wiring Systems in Go-Kart". International Journal for Research in Applied Science and Engineering Technology 9, n. VII (15 luglio 2021): 924–32. http://dx.doi.org/10.22214/ijraset.2021.36506.

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This paper is aimed to calculate and numerically analyse the effectiveness of Disc brakes before and after manufacturing of full scale Go-kart. Disc brakes are developed over time to time for being a reliable method of decelerating and stopping a vehicle. There are different designs of disk brake systems for various applications. This review gives an in depth description of various geometries of the components and therefore the materials utilized in a disk brake system. In spite of all the involvements, there are still many operational issues associated with disc brakes that need to be understand during operations and resolved. There has been tons of research happening about these issues and at an equivalent time different methods are being proposed to eliminate or reduce them. One major purpose of this paper is to provide a comprehensive overview of all such developments.

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Dragomir, George, Rares Pancu, Geza Husi, Liviu Georgescu e Horia Beles. "Studies about Reflected Temperature Variation for the Car Brake Disc". Applied Mechanics and Materials 822 (gennaio 2016): 135–40. http://dx.doi.org/10.4028/www.scientific.net/amm.822.135.

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An exact measurement of the disc brakes car temperature present difficulties, because the higher thermal stress is produced on the shiny metallic surface, which are in movement and in sliding contact with the brake pads. If an infrared camera is used for the thermal evaluating of the disc brakes, an important factor that must be considered is the reflected temperature. The aim of this research is to study the modification of the reflected temperature in correlation with the disk brake temperature and to establish a relationship for the estimation of this variation.

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García-León, R. A., N. Afanador-García e J. A. Gómez-Camperos. "Numerical Study of Heat Transfer and Speed Air Flow on Performance of an Auto-Ventilated Disc Brake". Fluids 6, n. 4 (16 aprile 2021): 160. http://dx.doi.org/10.3390/fluids6040160.

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In the braking system, the heat dissipation generated by the friction between the disc and pad should be evacuated as quickly as possible. In this work, five common different automotive disc brakes were studied through mathematical theories of heat transfer and numerical methods using the ANSYS software. In addition, a direct comparison between experimental, theoretical, and simulation values found in the open literature was performed to propose a disc brake with an improved geometry in terms of dissipation of heat transfer. The numerical results were considered to propose two possible solutions of disc brake geometries using N-38 ventilation blades used in aeronautic engineering. An improvement in temperature dissipation was achieved by approximately 23.8% compared to the five geometries analyzed with a simple type N-38 ventilation blade. The heat dissipation in the brakes strongly depends on the geometry of the disc, the geometry of the blades, the material from which it is manufactured, the material of the pad, the weight of the vehicle, and the operating conditions, as can be verified with mathematical calculations and experiments. The results obtained demonstrate that the discs can be used effectively in extreme working conditions (80 km/h and 33°C), without affecting the safety of the occupants and the braking system.

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Selvanathan, P. Sylvester, e R. Govindaraj. "Enhanced Temperature Control in Disc Brakes". Bonfring International Journal of Industrial Engineering and Management Science 7, n. 1 (31 marzo 2017): 05–08. http://dx.doi.org/10.9756/bijiems.8316.

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Joshi, Bhuvnesh. "Modification of Disc Brakes Using Rotating Brake Pads". IOSR Journal of Mechanical and Civil Engineering 7, n. 3 (2013): 43–45. http://dx.doi.org/10.9790/1684-0734345.

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Jiang, Jun Sheng. "Analysis on Wet Multi-Disc Brake Based on ABAQUS". Advanced Materials Research 421 (dicembre 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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Raikar, Dattaraj, e Omkar Sadwilkar. "Disc Brake Run-Out Detection System". International Journal for Research in Applied Science and Engineering Technology 10, n. 12 (31 dicembre 2022): 2028–32. http://dx.doi.org/10.22214/ijraset.2022.48333.

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Abstract: Disc brakes failure had become a major issue in vehicles these days, some of the common reasons for brake failures are reported to be a disc wobble, as it affects the overall braking, and the wobble caused on disc brakes generates a shudder at the passenger cabin through the brake pedal, which adds to a jagged movement of the vehicle. After carrying out deep research on this issue, an idea was formed to sense the wobble on the disc rotor. So, based on this idea a new concept for the Data Acquisition system is presented, namely: a Brake Disc Run-Out Sensor, which is designed on browser-based simulation software, Tinker-Cad. A Circuit diagram along with a block diagram is displayed and explained, addressing the main idea and objective of this prototype, this system will show the disc brake wobble or run-out data to the driver or controller via a visual indication. In this system, a tilt sensor is used and is interfaced with a microcontroller, every code is explained in detail with comments on each step. This system will increase the overall life of the brake rotor and the vibrations caused on the vehicle will be avoidable up to some extent. Therefore, reducing the maintenance cost of the vehicle

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Belhocine, Ali, e Wan Zaidi Wan-Omar. "CFD modeling and computation of convective heat coefficient transfer of automotive disc brake rotors -Modelado CFD y cálculo de la transferencia de coeficientes de calor por convección de rotores de freno de disco automotores". Revista Científica 2, n. 29 (1 maggio 2017): 116. http://dx.doi.org/10.14483/udistrital.jour.rc.2017.29.a1.

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Braking system is one of the basic organs to control a car. For many years, the disc brakes have been used in automobiles for safe retardation of the vehicles. During braking, enormous amount of heat will be generated, and for effective braking, sufficient heat dissipation is essential. The specific air flow surrounding the brake rotor depends on the thermal performance of the disc brake and hence, the aerodynamics is an important in the region of brake components. A CFD analysis is carried out on the braking system as the study of this case, to make out the behaviour of air flow distribution around the disc brake components using ANSYS CFX software. The main object of this work is to calculate the heat transfer coefficient (h) of the full and ventilated brake discs as a function of time using the CDF analysis which will be used later in the transient thermal analysis of the disc in ANSYS Workbench 11.0.

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Raja, Vijayanandh, Raj Kumar Gnanasekaran, Abdul Razak Kaladgi, Parvathy Rajendran, Sher Afghan Khan e Mohammad Asif. "Multi-Disciplinary Computational Investigations on Asymmetrical Failure Factors of Disc Brakes for Various CFRP Materials: A Validated Approach". Symmetry 14, n. 8 (5 agosto 2022): 1616. http://dx.doi.org/10.3390/sym14081616.

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Finite element analyses (FEA) are flexible and advanced approaches, which are utilized to address difficult problems of aerospace materials that exhibit both structural symmetrical and structural asymmetrical characteristics. Frictional behavior effects are used as a crucial element in this multidisciplinary study, and other structural, thermal properties are computed using FEA. Primary lightweight materials such as glass fiber reinforced polymer (GFRP), carbon fiber reinforced polymer (CFRP), kevlar fiber reinforced polymer (KFRP), titanium alloy, tungsten carbide, steel alloys, and advanced lightweight materials, such as silicon carbide (SiC) mixer, based on aforesaid materials underwent comprehensive investigations on aircraft disc brake, two-wheeler disc brake, and ASTM general rotating test specimen (G-99). Standard boundary conditions, computational sensitivity tests, and theoretical validations were conducted because the working nature of FEA may impair output dependability. First, FEA calculations were performed on a standard rotating disc component with two separate material families at various rotational velocities such as 400 RPM, 500 RPM, 600 RPM, 800 RPM, and 10 N of external frictional force. Via tribological experiments, frictional force and deformation of FEA outcomes were validated; the experimental outcomes serve as important boundary conditions for real-time simulations. Second, verified FEA was extended to complicated real-time applications such as aircraft disc brakes and automobile disc brakes. This work confirms that composite materials possess superior properties to conventional alloys for aircraft and vehicle disc brakes.

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García-León, Ricardo A., e Eder Flórez-Solano. "Dynamic analysis of three autoventilated disc brakes". Ingeniería e Investigación 37, n. 3 (1 settembre 2017): 102–14. http://dx.doi.org/10.15446/ing.investig.v37n3.63381.

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The braking system of a car must meet several requirements, among which safety is the most important. It is also composed of a set of mechanical parts such as springs, different types of materials (Metallic and Non Metallic), gases and liquids. The brakes must work safely and predictably in all circumstances, which means having a stable level of friction, in any condition of temperature, humidity and salinity of the environment. For a correct design and operation of brake discs, it is necessary to consider different aspects, such as geometry, type of material, mechanical strength, maximum temperature, thermal deformation, cracking resistance, among others. Therefore, the main objective of this work is to analyze the dynamics and kinetics of the brake system from the pedal as the beginning of mathematical calculations to simulate the behavior and Analysis of Finite Elements (FEA), with the help of SolidWorks Simulation Software. The results show that the third brake disc works best in relation to the other two discs in their different working conditions such as speed and displacement in braking, concluding that depending on the geometry of the brake and the cooling channels these systems can be optimized that are of great importance for the automotive industry.

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Rievaj, Vladimír, Lenka Mokričková e František Synák. "Temperature of the brakes and the Braking Force". Transport and Communications 5, n. 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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28

Joshi, Pranav, Sushovan Samantray e S. Senthur Prabu. "Investigation on Thermal Stress Analysis of Brake Disc Using ANSYS Simulation". ECS Transactions 107, n. 1 (24 aprile 2022): 10865–75. http://dx.doi.org/10.1149/10701.10865ecst.

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Abstract (sommario):

The brake system is a basic and one of the most important systems of an automobile vehicle. Brake rotors of disc brakes rotate with the wheels, and brake pads, which are fitted to the brake calipers, clamp on these rotors to stop or decelerate the wheels. They convert the vehicles kinetic energy into heat, vibration, and sound energies, so that the vehicle can be brought to a halt. This change in energy occurs between the brake pads and the rotors or disc in a disc brake system. In this study we focus on the high thermal stresses endured by the disc during this energy conversion. Due to these stresses, the material used for the discs becomes a very important factor as we have to choose the right material which can make these discs efficient and more durable. In this research work, the Formula Student Vehicle disc has been chosen and simulation of the thermal stresses and fatigue analysis with different materials of stainless steels (SS) grades like SS 304, SS 410, SS 321, and SS 310 was carried. These materials were chosen as these are readily available and the cost of manufacturing of these discs will be reduced. By the use of Solidworks software, the disc is designed. With the help of Ansys workbench, the simulation of the thermal stress analysis and fatigue of the discs is done. From this research output, the stainless steels grade SS 410 had better results.

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29

Li, Xiao Fei, Wen Bo Ni e Xue Mei Wang. "Thermal Load Analysis of a Brake Disc for a 220t Mining Dump Truck". Advanced Materials Research 619 (dicembre 2012): 188–94. http://dx.doi.org/10.4028/www.scientific.net/amr.619.188.

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Abstract (sommario):

Analyzing thermal load of friction pair of the disc brakes was not only an indispensable part but also a key theoretical basis for choosing materials of friction pair. In this paper, a brake disc of a mining dump truck with 220t loads was researched. In accordance with the brake test requirements of ISO3450-1996 standard, the finite element model was built using ANSYS software and then the transient simulation analysis of the temperature field for the brake disc was conducted. Finally the temperature distribution and its variation of the brake disc were analyzed in detail based on the simulation results.

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30

Degallaix, Gérard, Philippe Dufrénoy, Jonathan Wong, Paul Wicker e Frédéric Bumbieler. "Failure Mechanisms of TGV Brake Discs". Key Engineering Materials 345-346 (agosto 2007): 697–700. http://dx.doi.org/10.4028/www.scientific.net/kem.345-346.697.

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Abstract (sommario):

The CRISFIS project (supported by ADEME agency) consists in jointly studying the squealing and cracking aspects of the high power disc brakes for TGV very high speed trains. This paper deals with the progress concerning the cracking part. An experimental and modelling strategy is adopted in order to better understand and predict brake disc cracking. Braking tests conducted on an industrial scale-one test bench are presented. In a first step, the influence of the pad-type on the thermal loading applied to the disc is studied by means of an infrared camera and thermocouples embedded in the pads and in the disc. In a second step, the thermal maps extracted from thermographic monitoring are used as input data for thermal-mechanical calculations. Finally, the results of modelling and tests are compared to the damage observed on the brake discs.

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31

Shiao, Yaojung, e Mahendra Babu Kantipudi. "High torque density magnetorheological brake with multipole dual disc construction". Smart Materials and Structures 31, n. 4 (11 marzo 2022): 045022. http://dx.doi.org/10.1088/1361-665x/ac5860.

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Abstract (sommario):

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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32

Sudjadi, Usman. "Study about Surface Hardening on Local Disc Brakes with Direct Current Plasma Nitrocarburizing Apparatus". Advanced Materials Research 789 (settembre 2013): 383–86. http://dx.doi.org/10.4028/www.scientific.net/amr.789.383.

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Abstract (sommario):

Surface hardening on local disc brakes with DC-plasma nitrocarburizing apparatus has been carried out. Local disc brake was nitrocarburized at temperatures of 700 °C, 800°C, and 900°C for 3 hours, respectively. The results show that the hardness of sample of local disc brake before nitrocarburization was 167.86 Kgf/mm2, after the sample was nitrocarburized at temperature 900 °C for 3 hours, the hardness increased up to 649.38 Kgf/mm2. Matrixes on the base material were austenite, ferrite, and perlite.

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33

B, Aboli, Waghmode . e Dr S. N. Khan. "Design, Analysis and Shape Optimization Disc Brake by Using Thermal Analysis and Practical Testing". International Journal for Research in Applied Science and Engineering Technology 10, n. 7 (31 luglio 2022): 1297–304. http://dx.doi.org/10.22214/ijraset.2022.45472.

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Abstract (sommario):

Abstract: The disc brake is a device for slowing or stopping the rotation of a wheel. Friction causes the disc and attached wheel to slow or stop. Brakes convert friction energy into heat energy and this heat will be transfer to the disc. By using disc heat is send to air. For sending heat to air disc having cut section and hole on surface to improve heat transfer. In this paper we work on to improve heat transfer to air by using shapes. We work on original disc brake and developed five new shape for analysis. When we do the thermal analysis we found that one disc having better result than original one. So we final this disc for manufacturing and we test both disc

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34

Deng, Jin Lian, e Ying Ying Shan. "Simulation and Experimental Research of Disc Brake". Advanced Materials Research 472-475 (febbraio 2012): 2251–55. http://dx.doi.org/10.4028/www.scientific.net/amr.472-475.2251.

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Abstract (sommario):

Taking local-branded disc brakes for example, establishing the finite element model (FEM) of the assembly. Solving their stress and strain under work conditions, and the stress strain of its key components calipers and brackets is tested. The results showed that finite element analysis result of the caliper and bracket is consistent with experimental results, in line with engineering application, so finite element analysis process of brake assembly is feasible, finite element analysis for the brake industry to provide guidance.

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35

Newase, Srushti. "Thermal Analysis of Disc Brake System". International Journal for Research in Applied Science and Engineering Technology 9, n. 8 (31 agosto 2021): 1819–26. http://dx.doi.org/10.22214/ijraset.2021.37662.

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Abstract (sommario):

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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36

Mackin, Thomas J., Steven C. Noe, K. J. Ball, B. C. Bedell, D. P. Bim-Merle, M. C. Bingaman, D. M. Bomleny et al. "Thermal cracking in disc brakes". Engineering Failure Analysis 9, n. 1 (febbraio 2002): 63–76. http://dx.doi.org/10.1016/s1350-6307(00)00037-6.

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37

Gau, Wei Hsin, Kun Nan Chen e Chin Yuan Hung. "Squeal and Thermal Analysis of Automobile Disc Brake Rotors". Applied Mechanics and Materials 764-765 (maggio 2015): 369–73. http://dx.doi.org/10.4028/www.scientific.net/amm.764-765.369.

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Abstract (sommario):

The brakes of an automobile are among the most critical components regarding the safety features, and disc brakes are the most common type used in passenger vehicles. In this research, the squeal phenomena of a swirl-vent brake rotor and the thermal analysis of two straight-vent brake rotors, made of cast-iron and aluminum-alloy, are investigated. For the squeal analysis, finite element models are created and analyzed using a prestressed modal analysis with complex eigen-solutions. For the thermal analysis, heat transfer coefficients on the surfaces of a rotor as functions of time are first estimated by CFD simulation, and then imported to a thermal analysis program as the boundary condition. Finally, the temperature distribution of the rotor can be calculated by finite element analysis. The simulation results show that vortices will arise in the vented passages of straight-vent rotors, which means less heat carried away and lower heat transfer coefficients. The swirl-vent brake design is clearly better for thermal ventilation. Furthermore, under the same condition, aluminum-alloy rotors exhibit more uniform temperature distributions with smaller temperature gradients than cast-iron rotors do.

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38

Lü, Hui, Wen-Bin Shangguan e Dejie Yu. "A universal approach to squeal analysis of the disc brakes involving various types of uncertainty". Proceedings of the Institution of Mechanical Engineers, Part D: Journal of Automobile Engineering 232, n. 6 (28 giugno 2017): 812–27. http://dx.doi.org/10.1177/0954407017709644.

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Abstract (sommario):

On the basis of fuzzy random variables, a universal approach to squeal analysis of the disc brakes involving various types of uncertainty is proposed in this paper. In the proposed approach, first, the brake stability analysis function related to reliability is constructed with fuzzy random variables. Next, the fuzziness represented by fuzzy random variables is decomposed into interval uncertainties by using a level-cut strategy. Then, the expectations and the variances of the brake stability analysis function are approximately solved by the random moment method at different cut levels, and the lower bounds and the upper bounds of the expectations and the variances are calculated by using a first-order Taylor expansion and a subinterval analysis. Finally, by combining the different interval solutions with the corresponding cut levels, the fuzzy solutions of the brake stability analysis function are obtained, which can be employed to evaluate the brake squeal instability. The proposed approach provides a universal framework for dealing with various types of uncertainty that may exist in automotive brakes. The universality, the accuracy and the efficiency of the proposed approach to the squeal instability analysis of the brakes involving various types of uncertainty are verified by the analysis results from nine different numerical examples.

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39

Shinde, Dinesh, Mukesh Bulsara e K. N. Mistry. "Tribological performance of non-asbestos brake friction material in contact with brake disc of varying topography". Industrial Lubrication and Tribology 72, n. 10 (4 luglio 2020): 1277–83. http://dx.doi.org/10.1108/ilt-04-2020-0120.

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Abstract (sommario):

Purpose The purpose of this paper is to evaluate experimentally the influence of different surface roughness of the contacting disc on tribological performance of the non-asbestos brake friction material (BFM). Design/methodology/approach Taguchi method was applied to design an experiment using three different discs of gray cast iron with different surface roughness, which is measured using optical profilometer. These discs were subjected to sliding against pins prepared with the developed non-asbestos BFM, using pin on disc friction and wear monitor. Findings The experimental results shows that the disc 2 (Ra = 3.77 µm) gives wear of 22.78 µm and coefficient of friction of 0.462, which is recommended for extreme brake performance. Analysis of Taguchi design revealed that the disc surface was most significant parameter among the parameters under study. Practical implications During braking, continuous sliding between the BFM and brake disc or drum not only results into wear of BFM but also changes the surface finish of the brake drum or disc. This leads to variation in surface topography of the drum or disc surface with application of brakes, which further affects the characteristics of the BFM. Originality/value The tribological performance of BFM depends upon the topography of the surface on which it was sliding. To get best performance of the non-asbestos friction materials, disc having moderate surface finish is recommended. Scanning electron microscope micrographs had shown the different plateaus formed and energy-dispersive X-ray spectroscopy spectra identified presence of different chemical elements prior to sliding of the pins surface over different discs surface topography. Peer review The peer review history for this article is available at: https://publons.com/publon/10.1108/ILT-04-2020-0120/

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40

Mat Lazim, Ahmad Razimi, Mohd Kameil Abdul Hamid e Abd Rahim Abu Bakar. "Effects of Pad Surface Topography on Disc Brake Squeal". Applied Mechanics and Materials 165 (aprile 2012): 58–62. http://dx.doi.org/10.4028/www.scientific.net/amm.165.58.

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Abstract (sommario):

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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41

Niemann, Hartmut, Hermann Winner, Christof Asbach, Heinz Kaminski, Georg Frentz e Roman Milczarek. "Influence of Disc Temperature on Ultrafine, Fine, and Coarse Particle Emissions of Passenger Car Disc Brakes with Organic and Inorganic Pad Binder Materials". Atmosphere 11, n. 10 (5 ottobre 2020): 1060. http://dx.doi.org/10.3390/atmos11101060.

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Abstract (sommario):

Passenger car disc brakes are a source of ultrafine, fine, and coarse particles. It is estimated that 21% of total traffic-related PM10 emissions in urban environments originate from airborne brake wear particles. Particle number emission factors are in the magnitude of 1010 km−1 wheel brake during real-world driving conditions. Due to the complexity of the tribological processes and the limited observability of the friction zone between brake disc and pad, the phenomena causing particle emission of disc brakes are only partially understood. To generate a basis for understanding the emission process and, based on this, to clarify which influencing variables have how much potential for reduction measures, one approach consists in the identification and quantification of influencing variables in the form of emission maps. The subject of this publication is the influence of disc brake temperature on ultrafine, fine, and coarse particle emissions, which was investigated with a systematic variation of temperature during single brake events on an enclosed brake dynamometer. The systematic variation of temperature was achieved by increasing or decreasing the disc temperature stepwise which leads to a triangular temperature variation. Two types of brake pads were used with the main distinction in its chemical composition being organic and inorganic binder materials. The critical disc brake temperature for the generation of ultrafine particles based on nucleation is at approximately 180 °C for pads with an organic binder and at approximately 240 °C for pads with inorganic binder materials. Number concentration during those nucleation events decreased for successive events, probably due to aging effects. PM10 emissions increased by factor 2 due to an increase in temperature from 80 °C to 160 °C. The influence of temperature could be only repeatable measured for disc brake temperatures below 180 °C. Above this temperature, the emission behavior was dependent on the temperature history, which indicates also a critical temperature for PM10 relevant emissions but not in an increasing rather than a decreasing manner.

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42

SHARIFULLIN, I. A., A. L. NOSKO, E. V. SAFRONOV e D. V. KIRILLOV. "RESEARCH OF THE OPERATION OF MAGNETIC BRAKE ROLLERS OF GRAVITY ROLLER CONVEYORS". Fundamental and Applied Problems of Engineering and Technology, n. 4 (2021): 134–43. http://dx.doi.org/10.33979/2073-7408-2021-348-4-134-143.

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Abstract (sommario):

One of the main elements of safe operation of gravity conveyors used in gravity racks for pallets is the brake roller. The most promising design is a brake roller of magnetic (eddy current) type. A mathematical model of the process of moving pallets on a magnetic brake roller is developed. The equation of the speed of movement of the pallets on the brake magnetic roller obtained. The main parameter that determines the braking functions of the brake magnetic roller, and therefore the speed of movement of the pallet on the gravity roller conveyor is the coefficient of magnetic viscosity. A comparative experimental evaluation of the magnetic viscosity coefficient of eddy-current brakes of two designs - disk and centrifugal - has been carried out. It has been established that the coefficient of magnetic viscosity for both designs of brakes decreases with an increase in the air gap between the conductive body and the magnets when the magnets are placed on one and on both sides of the conductive body, and this dependence is exponential; for a disc brake, when magnets are placed on both sides of a conductive body, 2.5-3 times more than with a magnet located on one side of the disc; for a centrifugal brake when magnets are placed on both sides of a conducting body, 4-4.5 times less compared to a conducting body in the form of a disc with magnets on both sides and 1.5-2 times less than a conducting body in the form of a disc with a magnet one side.

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43

Sokolski, Piotr, e Justyna Sokolska. "ASSESSMENT OF THE INFLUENCE OF THE COEFFICIENT OF FRICTION ON THE TEMPERATURE DISTRIBUTION OF A DISC BRAKE DURING THE BRAKING PROCESS". Tribologia 288, n. 6 (31 dicembre 2019): 95–99. http://dx.doi.org/10.5604/01.3001.0013.7774.

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Abstract (sommario):

Brake assemblies are key mechanisms in the aspect of safe and reliable operation of devices and machines. Due to intense thermal processes that occur during braking, the brakes are exposed to an accelerated wear. The article assesses the impact of tribological cooperation conditions between the caliper and the disc of a disc brake on the temperature of a disc. The variable value in the simulations was the coefficient of friction between the cooperating surfaces. A direct effect of the increase of the analysed parameter on the enhancement of brake elements’ temperature was found. At the same time, a similar nature of thermal processes was observed for all values of the friction coefficient taken into account.

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44

Yeom, Yun-Taek, Min-Soo Kim, Hak-Joon Kim, Sung-Jin Song, Ho-Yong Lee, Sung-Duk Kwon, Sung-Sik Kang e Deok-Yong Sung. "A Study on Depth Sizing for Surface Cracks in KTX Brake Disc Using Rayleigh Wave". Advances in Materials Science and Engineering 2019 (8 aprile 2019): 1–15. http://dx.doi.org/10.1155/2019/6041709.

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Abstract (sommario):

Korea Train eXpress (KTX), high-speed railway system, provides an important platform for public transportation and connects major metropolitans in Korea. KTX aiming towards next-generation transportation system has plans to increase the operation times. However, with increasing operation times, safety and reliability of the railways especially inspection of brakes systems becomes important. Therefore, in this study, a KTX brake disc inspection system using the Rayleigh wave is developed to characterize the cracks in the discs. The performance of the inspection system is evaluated on the KTX brake discs specimen having fabricated cracks as well as natural cracks. The result shows that the proposed algorithm successfully characterizes the crack types and estimated the length, width, depths and gap between cracks with good accuracy.

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45

Krivosheya, Yuriy Vladimirovich, e Tatyana Leonidovna Ripol-Saragosi. "Construct and energy reserves improvement of exploitative properties rail friction brake". Transport of the Urals, n. 2 (2020): 26–30. http://dx.doi.org/10.20291/1815-9400-2020-2-26-30.

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Abstract (sommario):

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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46

Olshevskiy, Alexander, Alexey Olshevskiy, Oleg Berdnikov e Chang-Wan Kim. "Finite element analysis of railway disc brake considering structural, thermal, and wear phenomena". Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science 226, n. 7 (15 novembre 2011): 1845–60. http://dx.doi.org/10.1177/0954406211428705.

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Abstract (sommario):

The purpose of this research is to identify the thermomechanical factors to be considered in simulation of the braking process, calculation of the distribution of the contact pressure, and temperature and obtain wear patterns for the disc brake system in operation. The factors affecting the temperature distribution and stress–strain state of disc brakes in railway vehicles are analyzed. The mutual influence of the thermal problem and contact problem was considered. The results of the numerical simulations for the finite element models can be used in optimizing the disc brake design in order to reduce wear and provide higher reliability of the braking system.

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47

Gradin, Katja Tasala, e Anna Hedlund Åström. "Comparative life cycle assessment of car disc brake systems—case study results and method discussion about comparative LCAs". International Journal of Life Cycle Assessment 25, n. 2 (4 novembre 2019): 350–62. http://dx.doi.org/10.1007/s11367-019-01704-9.

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Abstract (sommario):

Abstract Purpose Two life cycle assessment (LCA) studies comparing a new low-particulate-matter-emission disc brake and a reference disc brake were presented. The purpose was to identify the difference in potential environmental impacts due to a material change in the new disc brake parts. Additionally, the validity was investigated for the simplification method of omitting identical parts in comparative LCA. This was done by comparing the results between the simplified and the full LCA model. Methods The two disc brakes, new disc brake and reference disc brake, were assessed according to the LCA ISO standards. The ReCiPe 2016 Midpoint (hierarchist) impact assessment method was chosen. Simplifying a comparative LCA is possible, all identical parts can be omitted, and only the ones that differ need to be assessed. In this paper, this simplification was called comparative LCA with an omission of identical parts. Results and discussion The comparative impacts were analysed over seventeen impact categories. The new disc brake alternative used more resources during the manufacture of one disc compared to the reference disc brake alternative. The shorter life length of the reference disc demanded a higher number of spare part discs to fulfil the same functional unit, but this impact was reduced due to material recycling. The new disc brake impacts were connected primarily to the coating and secondly to the pad manufacture and materials. The validity of the simplification method was investigated by comparing the results of the two LCA models. The impact differences were identical independent of the LCA model, and the same significant impact categories could be identified. Hence, the purpose of the study could be fulfilled, and the simplification was valid. Conclusions Both LCA models, simplified and full, revealed that the new disc brake had limited environmental advantages. The omission of identical parts made it more challenging to determine if an impact was significant or insignificant. The simplification seemed to be reasonable.

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García-León, Ricardo Andres, Wilder Quintero-Quintero e Magda Rodriguez-Castilla. "Thermal analysis of three motorcycle disc brakes". Smart and Sustainable Built Environment 9, n. 2 (20 novembre 2019): 208–26. http://dx.doi.org/10.1108/sasbe-07-2019-0098.

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Abstract (sommario):

Purpose The braking system on motorcycles is of vital importance, taking into account that its operation is based on the friction between the surfaces in the contact that are found heat and, therefore, the brake liquid, the thermoelastic deformation on the contact surface, the degradation and failure of the material, as can be attributed to the safety of the occupants. The purpose of this paper is to perform mathematical calculations regarding the phenomena of the transfer of heat generated in the brake system. Design/methodology/approach Using SolidWorks simulation software, the geometric model of the three disc brakes of the different cylinders was carried out to identify the elements with the variations of the maximum temperature, and the verification with the calculations was made under ideal condition (80 Km/h and 12°C). Findings The results obtained show that with the mathematical calculations it was possible to validate the correct functioning of the braking system under different operating conditions, the systems that have higher capacity of displacement generate higher heat loss at higher speed so that their time of cooling according to Newton is major. Originality/value Through the analysis of finite elements, it was possible to identify that the braking system in severe working conditions is not overheated, assuring a natural convection cooling in approximately 12 min according to the mathematical calculations made.

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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, n. 12 (3 dicembre 2020): 8–15. http://dx.doi.org/10.46501/ijmtst061202.

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Abstract (sommario):

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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50

Belhocien, Ali, e Wan Zaidi Wan Omar. "CFD Modeling and Simulation of Aeorodynamic Cooling of Automotive Brake Rotor". Journal of Multiscale Modelling 09, n. 01 (marzo 2018): 1750008. http://dx.doi.org/10.1142/s1756973717500081.

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Abstract (sommario):

Braking system is one of the important control systems of an automotive. For many years, the disc brakes have been used in automobiles for the safe retarding of the vehicles. During the braking enormous amount of heat will be generated and for effective braking sufficient heat dissipation is essential. The thermal performance of disc brake depends upon the characteristics of the airflow around the brake rotor and hence the aerodynamics is an important in the region of brake components. A CFD analysis is carried out on the braking system as a case study to make out the behavior of airflow distribution around the disc brake components using ANSYS CFX software. We are interested in the determination of the heat transfer coefficient (HTC) on each surface of a ventilated disc rotor varying with time in a transient state using CFD analysis, and then imported the surface film condition data into a corresponding FEM model for disc temperature analysis.

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