Distribution Of Frictional Heat Research Articles

Pressure influence on heating of ventilating disc brakes for passenger cars

The braking system is one of the most important elements in vehicle systems from the aspect of vehicle safety, besides the steering system and the internal combustion engine. During the braking process, the disc and pads absorb a large amount of kinetic energy that converted to heat. Owing to this frictional heating, it is necessary to compute the temperature distribution that will be appeared during the braking process, which is the main goal of this research paper. There are many factors that can be influenced to the distribution of frictional heat generated. One of the significant factors is the applied pressure by the brake pad on the braking disc. The results proved that when increased the applied pressure then the frictional heat generated increased too. It was developed a new finite element model based on observed data from real vehicle. It was used ANSYS/WORKBENCH 14.5 software to perform the numerical analysis, module Transient Structural. Parts that are the most disposed to the thermal stress are braking pads. Also, it was found time period from 0 to 0.1 second is the most critical period during the whole braking period, because in this period, temperature rises rapidly, the maximum temperature occurred at 1.338 seconds, and after that it falls.

The distribution of frictional heat generated between the contacting surfaces of the friction clutch system

The frictional heat generated during the initial engagement will influence negatively the performance and lifetime of the friction clutches, this heat generated will lead to appear excessive temperatures in the contact surfaces and subsequently accelerate the wear process in the contact area. The amount and distribution of the heat generated are depending on many variables such as the contact pressure, the coefficient of friction, sliding speed, etc. In this research paper, MATLAB program was built based on the analytical solutions which used to determine the distribution and amount of the total heat generation at the interface between the contacting parts of the friction clutch. Furthermore, the amount and distribution of the frictional heat generation on the contact area of each element of the friction clutch system (flywheel, clutch disc, and pressure plate) during the sliding stage was calculated. Finally, the program was introduced using MATLAB GUI (graphical user interfaces) to analyze the heat generated on the friction clutch surfaces. Different types of materials (thermal properties), sliding time, torque function and angular sliding speed function can be applied into the software to find the solution for a specific case of a single-plate friction clutch.

Analysis of Thermal-Mechanical Coupling of Automotive Disc Brake Based on Numerical Simulation Method

The background and necessity of application of numerical simulation method in research on friction materials of automotive brake are analyzed. The numerical analysis methods of conversion of braking energy, distribution of friction heat, transfer of friction heat and thermal mechanical coupling, are discussed. The dynamic temperature field and thermal stress field of the same brake disc and two kinds of friction plates of different materials, which are the composite materials based on resin and the powder metallurgy based on copper, are simulated and analyzed respectively under emergency braking. The effect of friction materials’ performance on friction temperature and thermal stress distribution is obtained. The results show that the friction performance of composite materials based on resin is better than the powder metallurgy based on copper. The results are consistent with the experimental results. The numerical simulation methods proposed have a good predictive effect on the typical characteristics of friction materials in the process of braking, which provides effective references for preparation and optimization design of friction materials of brake.

Thermal Analysis of FSAE Racing Brake Disc Based on Algor

The design of racing brake disc is one of the keys of the car braking system. The initial design of brake disc is based on the overall parameters and design requirements of South China University of Technology FSAE racing car. According to the mechanism of friction heat and friction heat distribution, a simple finite element model of temperature field model, boundary conditions and, using Algor to do a simulation of transient temperature field plate, the front and rear brake discs to determine the final size is analyzed.

Analysis on the Increasing Gearbox Cooling System of Wind Power Generator Based on ADINA

As the core components in the wind power generator set, the maintenance of gear box is very difficult, and its maintenance fee also is extremely high. To prevent gearbox teeth fault injuries in the supernormal heavy load, the driving friction heat distribution and heat transfer characteristics of wind power gear box are studied, the wind power generator increasing gearbox structure characteristics are analyzed. The parametric model of increasing gearbox is completed in UG software and finite element analysis of gear temperature and heat stress is conducted in ADINA software. Through the analysis on the calculation results, the design idea of wind power generator cooling system is summarized, and provides theoretical basis for the design of increasing gearbox cooling system for wind power generator.

Distribution of Friction Heat Between a Stationary Pin and Rotating Ring

The analysis of the heat distribution between a stationary pin and rotating ring was considered. To solution of the governing quasi-stationary heat conductivity equation the finite Fourier transform was used. The convective cooling from outer and internal surface of the ring as the boundary conditions were considered. The ring surface temperature, the average temperature on the ring surface and the heat distribution coefficient for the studied system were determined. The numerical results for the temperatures and heat distribution coefficient which demonstrated the effects of the Biot number and internal radius of the ring on them, were presented.

EFFECT OF A THIN FILM ON THE HEAT DISTRIBUTION BETWEEN A STATIONARY PIN AND A ROTATING DISK

Abstract An analytical model has been developed for the determination of the friction heat distribution coefficient at the sliding interface of a stationary pin and a rotating layered disk. First, we analyzed the temperature distribution of a disk with a thin film subjected to a moving factional heat flow traversing with constant speed over the film surface. In addition to the lateral surface boundary conditions, convective cooling from the side faces is considered. A quasi-stationary theory is applied by use of a finite Fourier transformation. The solution of the heat conduction problem for the stationary pin is trivial. The heat distribution between the pin and the disk was obtained by matching the average contact temperatures. The effect of the thin film on the surface temperature distribution was studied.

Friction heat distribution between a stationary pin and a rotating disc

An analytical model has been developed to find the distribution of heat between a vertical stationary cylindrical pin and a rotating disc. This model covers a wide field of practical applications. The conduction of heat from the sliding contact zone in the axial direction of the pin and the radial direction of the disc, as well as the heat convection from the sides and periphery of the disc and from the side of the pin are taken into account. The heat conduction problem has been solved for both the rotating disc and the stationary pin, the average temperature over the contact area has been determined and the heat distribution between them has been obtained by matching the average temperatures. Graphs are included to facilitate the numerical calculations and to illustrate the results obtained.

Thermal Effects Due to Surface Films in Sliding Contact

The present work examines theoretically the influence of surface coatings on the temperatures produced by friction due to sliding contact. A generalized thermal model is developed which incorporates three-dimensional, transient heat transfer between layered media with thermal coupling at multiple, interacting contact patches. A solution technique based on a variation of the boundary element method is developed and utilized. The method allows for the solution of the distribution of frictional heat and the resulting temperature rise in an accurate yet numerically efficient manner. Results are presented showing the influence of film thickness, thermal properties, velocity, and contact area on the division of heat and surface temperature rise. The results show that a film with thermal properties different than those of the substrate can have a pronounced effect on the predicted temperature rise.

A compilation of heat distribution parameters at sliding contacts

The knowledge of temperatures developed between two bodies of known geometry in sliding contact is very important for many practical applications. The dependence of this temperature on a dimensionless number, as is shown below, was the basis for the calculation and tabulation of this number for a variety of parameter constellations. The temperature developed between the bodies and the distribution of frictional heat were based on experimental results and analyses from the literature. The dependence of the characteristic dimensionless number on the Biot number and the body geometry was the basis for the tabulation of the characteristic number which can be applied directly

The distribution of friction heat between a stationary pin and a rotating cylinder

The knowledge of the distribution of friction heat between two bodies in sliding contact is necessary for the calculation of the elevated temperatures at the contact area. An analytical model has been devised for the calculation of the coefficient for the friction heat distribution between a rotating cylinder and a stationary pin. This model covers a wide field of practical applications. The results of this analysis are in very good agreement with the experimental results existing in the bibliography. Graphs are included to facilitate the numerical calculations. The proposed model takes into consideration the specific geometric configurations and the surface heat transfer conditions of the bodies coming in sliding contact.