Brake design method based on heat engine 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: 2019-09-13
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] like 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, and the braking deceleration is 4.9m / s 2 , the brake pressure increase rate is 200bar / s, and the initial temperature of the brake disc is 50°C. Collect brake pres...
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The invention relates to a brake design method based on a heat engine coupling deformation test. The method comprises the following steps: S1, performing a brake heat engine coupling deformation testto obtain a brake disc deformation curve; S2, performing decomposition according to the brake disc deformation curve and via the synchronization of SRO of a braking pressure and a brake disc in the time dimension to obtain mechanical deformation and thermal effect deformation of the brake disc, superposing the SRO on both sides of the brake disc to obtain a brake disc thickness difference DTV of acorresponding mechanical deformation and thermal effect deformation stage; S3, establishing evaluation indicators, respectively evaluating the decomposed mechanical deformation and the thermal effectdeformation of the brake disc, and the DTV of the brake disc, if all factors meet the evaluation indicators, using the design as a brake design scheme, and if one of the factors does not meet the evaluation indicators, executing step S4; and S4, performing corresponding design improvement according to the unqualified evaluation indicators, and finally obtaining the brake design scheme. Compared with the prior art, the brake design method provided by 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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Patent Timeline
Login to View More IPC IPC(8): G01M17/007G01N25/00G06F17/50
CPCG01M17/007G01N25/00G06F30/17G06F2119/06G06F2119/08
Inventor 孟德建潘剑锋张立军张彬
Owner TONGJI UNIV