A Brake Design Method Based on Thermal-Mechanical Coupling Deformation Test
A deformation test, thermo-mechanical coupling technology, applied in computer-aided design, testing of machine/structural components, instruments, etc., can solve problems such as braking torque fluctuations, and achieve the effect of suppressing NVH problems and shortening the development cycle
Active Publication Date: 2020-11-27
TONGJI UNIV
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Problems solved by technology
[0003] Through the multi-physics analysis of the thermal-mechanical coupling of the brake during the braking process, it is found that there are mechanical deformation caused by mechanical pressure and thermal effect deformation caused by the thermal-mechanical coupling effect during the braking process, and the mechanical deformation and thermal effect deformation change the brake. The state of stress distribution and the state of contact between the brake disc and the friction lining produce phenomena such as braking torque fluctuations, which cause NVH problems in the braking system
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[0032] Such as figure 1 As shown, the present invention proposes a brake design method based on thermal-mechanical coupling deformation test, which can quickly separate and extract the mechanical deformation and thermal effect deformation during the braking process, and proposes an effective method for reducing the deformation of the brake disc during the braking process. measures, including the following steps:
[0033] Step 1: Carry out thermal-mechanical coupling deformation bench tests for ventilated brake disc brakes, including three working conditions of single braking, thermal warping, and thermal vibration. The moment of inertia of the test bench is set to 74.60kg m 2 , the working condition of the medium heat warping condition is set as the initial speed of the brake disc is 1350rpm, the final speed is 0rpm, the braking deceleration is 4.9m / s2, the brake pressure increase rate is 200bar / s, and the initial speed of the brake disc is 0rpm. The temperature is 50°C. Co...
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Abstract
The invention relates to a brake design method based on a thermal-mechanical coupling deformation test, comprising the following steps: S1. Conducting a thermal-mechanical coupling deformation test of the brake to obtain a brake disc deformation curve; S2. According to the brake disc deformation curve, through the braking pressure and braking The synchronization of the SRO of the moving disc in the time dimension can be decomposed to obtain the mechanical deformation and thermal effect deformation of the brake disc, and the corresponding thickness difference DTV of the brake disc in the mechanical deformation and thermal effect deformation stages can be obtained by superimposing the SRO on both sides of the brake disc; S3, Establish the evaluation index, evaluate the decomposed brake disc mechanical deformation, thermal effect deformation and brake disc DTV respectively, if all meet the evaluation index, use this design as the brake design scheme, if one of them does not meet the evaluation index, proceed to step S4; S4. Carry out corresponding design improvements according to the evaluation indicators that do not meet the requirements, and finally obtain the brake design scheme. Compared with the prior art, the invention has the advantages of high design efficiency, low cost and the like.
Description
technical field [0001] The invention relates to the field of automobile brake design and development, in particular to a brake design method based on thermal-mechanical coupling deformation test. Background technique [0002] Brake friction vibration and noise have always been one of the important issues affecting the NVH performance of the whole vehicle. In the ranking of new car quality problems complained by customers, brake vibration and noise have always been ranked in the top three. In the braking process, there is a complex strong coupling relationship between the temperature field, stress field and thermal effect deformation of the brake disc. Therefore, multi-physics analysis is the basis for effectively solving brake NVH problems such as brake vibration, flutter, and hot spots. [0003] Through the multi-physics analysis of the thermal-mechanical coupling of the brake during the braking process, it is found that there are mechanical deformation caused by mechanical...
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IPC IPC(8): G01M17/007G01N25/00G06F30/17G06F119/14
CPCG01M17/007G01N25/00G06F30/17G06F2119/06G06F2119/08
Inventor 孟德建潘剑锋张立军张彬
Owner TONGJI UNIV