scholarly journals Computer analysis of transient thermal process of brake discs considering the model dimensionality and the disc brake design

2018 ◽  
Author(s):  
Yanko Slavchev
Keyword(s):  
Computer Analysis ◽  
Thermal Process ◽  
Disc Brake ◽  
Brake Discs ◽  
Transient Thermal

Experimental Study of Convective Heat Transfer in Standard and Cross-Drilled Brake Discs With Radial Vane and X-Lattice Cores

2018 ◽  
Author(s):  
Hongbin Yan ◽  
Shangsheng Feng ◽  
Wei-Tao Wu ◽  
Tian Jian Lu ◽  
Gongnan Xie
Keyword(s):  
Heat Transfer ◽  
Experimental Comparison ◽  
Brake Disc ◽  
Disc Brake ◽  
Cooling Performance ◽  
Flow And Heat Transfer ◽  
Brake Discs ◽  
Flow Through ◽  
The Cross ◽  
Transfer Mechanisms

To improve the cooling performance of disc brake systems, cross-drilled holes penetrating across the rubbing discs are separately introduced into a commercial radial vane brake disc (as reference) and a novel X-lattice cored brake disc. Prototype samples of both the reference and cross-drilled brake discs are fabricated. A rotating test rig is designed and constructed to characterize and compare the cooling performance of the brake discs with infrared thermography. Within the typical operating range of a vehicle, e.g., 200–1000 rpm, the experimental results show that the introduction of cross-drilled holes can substantially enhance brake disc cooling. For the radial vane brake disc, the overall Nusselt number is enhanced by 31%–44%; for the X-lattice cored brake disc, the cross-drilled holes only lead to 9%–18% enhancement. As the radial vane brake disc and the X-lattice cored brake disc with cross-drilled holes exhibit similar cooling performance, flow through the cross-drilled holes has a more prominent effect on the former than the latter. Corresponding fluid flow and heat transfer mechanisms underlying the enhanced heat transfer by cross-drilled holes and the different effects of cross-drilled holes on the two distinct brake discs are explored. The experimental comparison and the thermo-fluidic physics presented in this paper are beneficial for engineers to further improve disc brake cooling.

Optimizing Proportions of Railway Brake Discs by Temperature Transients Evaluation

1988 ◽  
Vol 202 (2) ◽  
pp. 91-99 ◽  
Author(s):  
S Missori ◽  
A Sili
Keyword(s):  
Thermal Cycle ◽  
Brake Disc ◽  
Disc Brake ◽  
Simple Method ◽  
Brake Discs ◽  
Brake Application ◽  
Dimensional Parameters ◽  
Maximum Temperatures ◽  
Commercial Size

When evaluating the performances of railway brake discs, the ability to accumulate and spread heat to the air plays a major role, since wear of synthetic lining and disc deterioration are strongly dependent on maximum temperatures attained on the surface in contact with the friction pad. The energy developed during brake application gives rise to an increase of disc temperature, which can be correlated to braking power, braking sequences and durations and to disc features. Maximum temperatures are attained on the friction surface of the disc. Determination of the thermal cycle subsequent to brake application can be considered preliminary to the study of lining and disc wear. The present work proposes a simple method using finite difference numerical analysis to evaluate the efficiency of the brake disc in dissipating the heat, both on a constant speed and an up-to-stop brake application. The effect of the various dimensional parameters, such as number of ribs, disc thickness and ribs width, is considered with the aim of achieving a first rough optimization of the required size of disc brake. The results related to a commercial size disc brake are given.

scholarly journals FEA Analysis of coupled thermo-mechanical response of grey cast iron material used in brake discs

2019 ◽  
Vol 3 (36) ◽  
pp. 280-296
Author(s):  
Ali Belhocine ◽  
Asif Afzal
Keyword(s):  
Thermal Analysis ◽  
Mechanical Response ◽  
Numerical Procedure ◽  
Brake Disc ◽  
Structural Method ◽  
Thermomechanical Model ◽  
Brake Discs ◽  
The One ◽  
Von Mises ◽  
Transient Thermal

In this work, we will present numerical modeling using the ANSYS software adapted for finite element method, to follow the evolution of the global temperatures for the two types of brake discs, full and ventilated disc during a braking scenario. Also, the numerical simulation of the transient thermal analysis and the static structural one is performed here sequentially with the coupled thermo-structural method. A numerical procedure of calculation relies on important steps such that the CFD thermal analysis is well illustrated in 3D, showing the effects of heat distribution over the brake disc. This CFD analysis will help us in the calculation of the values of the thermal coefficients (h) that will be exploited in the 3D transient evolution of the brake disc temperatures. Three different brake disc materials were selected in this simulation and a comparative analysis of the results was conducted in order to derive the one with the best thermal behavior. Finally, the resolution of the coupled thermomechanical model allows us to visualize other important results of this research such as; the deformations, and the equivalent stresses of Von Mises of the disc, as well as the contact pressure of the brake pads. Following our analysis and the results we draw from it, we derive several conclusions. The choice will allow us to deliver the best suitable design of the brake rotor to ensure and guarantee the good braking performance of vehicles.

scholarly journals Cylindrical body temperature field simulation which made in the transitional thermal process conditions out of polymer material

2020 ◽  
Vol 7 (3) ◽  
Author(s):  
Liliya Petrova ◽  
Tatyana Gavrilova
Keyword(s):  
Temperature Field ◽  
Heat Conduction ◽  
Body Temperature ◽  
Polymer Composite ◽  
Thermal Process ◽  
Cylindrical Body ◽  
Phase Delay ◽  
Process Conditions ◽  
Two Phase ◽  
Transient Thermal

The advancing requirements for strength, relaxation, thermophysical, electrical, and other structural elements characteristics actualizes the polymer composite material use for the soft part and node point manufacture, which improves performance index. This paper reported the need to take into account relaxation phenomena in predicting the body’s thermal field development that is made of polymeric materials, and the thermal relaxation time and the thermal damping time proportional to the duration of transient thermal process certain periods. In this article three-period thermal process in a cylindrical body mathematical model is presented. cylindrical body made of a low-heat-conducting material by using a heat conduction hyperbolic equation that is reflecting the heat flow relaxation and thermal damping phenomenon. A numerical solution to the problem of unsteady heat conduction in a circular disk for a two-phase delay equation is presented, which is based on the grid method implementation by using a three-layer implicit difference scheme and the finite difference method use. Calculation formulas for the run-through coefficients as well as the temperature values at the outer boundaries are concluded using the boundary conditions approximation for the intermediate and upper time layers, taking into account the multi-period of the process. The implementation of the modified run-through method when solving the non-stationary heat conduction problem in a cylindrical body, taking into account the finite heat propagation speed and thermal damping is described. The calculation results for the cylindrical body temperature field are obtained by using the polymethyl methacrylate example upon sudden heating based on a model with a two-phase delay. The results presented in this paper aid in an increase in predicting temperature field accuracy in polymer composite materials in the transient thermal processes study.

TRANSIENT THERMAL ANALYSIS OF DOUBLE DISK BRAKE ROTOR OF DIFFERENT MATERIALS USING HYBRID MECHANISM

2021 ◽  
Vol 10 (3) ◽  
pp. 22-27
Keyword(s):  
Thermal Analysis ◽  
Disc Brake ◽  
Transient Thermal Analysis ◽  
Disk Brake ◽  
Hybrid Mechanism ◽  
Disc Brakes ◽  
Brake Rotor ◽  
Multiple Materials ◽  
Different Shapes ◽  
Transient Thermal

This paper is presented on Design and Thermal analysis of disc brake rotor of different materials, which analyze about on disc brake rotor by analysis of different shapes of slot of different vehicles Disc brake rotor. Therefore, it can optimize number of shapes of slot to estimate the good thermal conductivity of the disc brake rotor. CATIA V5R21 and ANSYS 19R1 software’s are using for Modeling, Static and Transient Thermal Analysis. Heat generated is dissipated faster or the disc material gets less heated. Here is consideration of a metal multiple materials which will satisfy above criteria. An analysis of composite and SS disc brakes over a repeated braking is done and the results are analyzed.

Sign in / Sign up

Export Citation Format

Share Document