Thermal Analysis of Vented Disc and Optimization of the Shape of The Vented Curves In AALRT
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Date
2015-05
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Addis Ababa University
Abstract
The disc brake is a device for slowing or stopping the rotation of a wheel. Braking of the vehicle leads to heat generation during each braking event. Transient thermal analysis of the Rotor Disc of Disk Brake is aimed at evaluating the performance of ventilated disc brake rotor of a rail vehicle under emergency braking conditions and there by assist in optimization the curves of the shape of ventilated disc to identified the thermal analysis effect during braking. Here Disc brake modeled with CATIA software and its analysis is done using ANSYS workbench 12 with considering CFD-cfx package software. The main purpose of this study is to analyzing the thermal behavior of the ventilated disc brake during the braking phase by optimization the shapes of the curves of the vented disc and compare results. The coupled thermal-structural analysis is used to determine the Von Mises stress established in the disc for ventilated disc with the same materials and other data from ERC to enhance performance of the rotor disc.
The results from the simulation with changing shapes of the vane like vane number, vane angle and vane curve radius; as vane number 50 ,60, 70 and 80 , then temperature generated reduced from 311.76-302.67[°C] until vane number 70. But at vane number 80 it is 308.94 [°C].And with changing the straight vane number 50 to 5, 10 and 20 angles its values of temperature generating at a time of 5.2488 [s] is 302.9, 239.86 and 302.24 respectively and at vane numbers 60 and 70 at angle 5 and 20 their values are 310.44, 310.19[°C] at time 5.2488 [s] and 309.86, 309.72 [°C] at time 5.0868 [s]respectively. At changes of vane curve radius from straight to 120 to 60mm its generating temperature is reduced 312.03 to 309.83 [°C] at time 5.2488[s]. Generally from simulation of emergency brake at braking time 9.72[s], reduced generating temperature at vane number 70 and at vane angle 5 with vane number 50 are 302.67 and 302.9[°C] respectively which preferable at emergency brake-1, when simulated at tentative with applying initial temperature induced at emergency brake-1, induced temperature at emergency brake-2 increase to 361.99 and 362.55[°C], these are preferable to compare from the current AALRT uses which is induced 383.26[°C] at emergency brake-2.
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Keywords
Finite element (FEM),, CATIA, ERC Vented disc, ANSYS and Workbench-12, CFD, AALRT