Determination method of load frequency for torsional impact fatigue test of electric vehicle differential
An electric vehicle, impact fatigue technology, applied in vehicle testing, machine/structural component testing, instruments, etc., can solve problems such as lack of objective specifications for the loading frequency of test loads and large differences in fatigue damage.
Active Publication Date: 2022-02-11
CHONGQING UNIV OF TECH
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Problems solved by technology
At present, the standards for the torsional impact fatigue test of the electric vehicle differential are still lacking, especially the lack of objective specifications for the frequency of the test load, which is basically determined subjectively by humans, resulting in a large difference from the fatigue damage during actual driving
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[0045] In order to better reflect the feasibility and practical application value of the present invention, a complete electric vehicle differential torsional impact fatigue test will be described in detail in this specific embodiment. The steps of the electric vehicle differential torsional impact fatigue test are as follows.
[0046] 1) Determine the test load loading waveform
[0047] Compared with static or quasi-static loads, impact loads have the characteristics of high strength and short time consumption, so that the structure of the test piece shows local deformation and fracture under the action of stress waves.
[0048]According to the current test conditions and technical level, the possibility of completely simulating the actual impact environment in the impact test is low. Existing impact equipment can only output several typical repetitive impact processes with a certain accuracy. As the load output device of the test bench, the torque actuator can output vario...
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The invention discloses a method for determining the load frequency of a torsional impact fatigue test of an electric vehicle differential, which relates to the technical field of electric vehicles. The dangerous cross-section is obtained as a strain test point through the force analysis of key parts, and the measured strain and torque are obtained. Relationship Transform the S-N curve into a torque-fatigue life curve, determine the amplitude range of the test load, test the strain under loads with the same frequency and different amplitudes, and perform statistical analysis on the strain data. The analysis results show that the strain increases with the loading The amplitude changes basically linearly; m test amplitudes are selected within the range of test load amplitudes, and the fatigue life values corresponding to m test amplitudes are obtained according to the torque-fatigue life curve, and a set of equations is established to solve each loading The loading frequency corresponding to the amplitude. The invention solves the technical problem of how to objectively determine the loading frequency of the test load for the torsional impact fatigue test of the electric vehicle differential.
Description
technical field [0001] The invention relates to the technical field of electric vehicles, in particular to a method for determining the load frequency of a torsional impact fatigue test on a differential of an electric vehicle. Background technique [0002] As environmental and energy issues become more and more serious, pure electric vehicles are the representative of new energy vehicles, and the research and development and testing of motors, electronic control systems, and mechanical transmission systems have become the focus of the industry. As the power source of electric vehicles, the motor has the advantages of quick response and stable control of output torque. However, due to the principle of electromagnetic induction and the weak damping characteristics of the electric vehicle drive train, after the command torque is given, the output torque of the motor will fluctuate up and down in the command torque value, which not only affects the smoothness of the torque, but...
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IPC IPC(8): G01M13/027G01M17/007
CPCG01M13/027G01M17/007
Inventor 邹喜红李金晓袁冬梅胡秋洋席帅杰付凌锋蒋明聪凌龙苟林林王超
Owner CHONGQING UNIV OF TECH