Standardization method of load spectrum for reliability tests of four poster
ZHAO Lihui1,2,3, YANG Peng1, WENG Shuo1,2,3, FENG Jinzhi1,2,3, ZHENG Songlin1,2,3
1.College of Mechanical Engineering, University of Shanghai for Science and Technology, Shanghai 200093, China;
2.Key Lab for Strength & Reliability Evaluation of Automobile Chassis Mechanical Parts in Machinery Industry, University of Shanghai for Science and Technology, Shanghai 200093, China;
3.Shanghai Public Technology Service Platform for Reliability Evaluation of New Energy Vehicles, Shanghai 200093, China
Abstract：The bench test based on four columns is an important way of reliability evaluation in the process of vehicle development. At present, the test mode of vehicle load collection road spectrum iteration in test field needs to measure the real vehicle load of each vehicle, which has the problems of long test cycle and low product reliability and high improvement cost. In this paper, based on the load similarity of different vehicle types under the same test site reliability specification, the standardization research of vehicle four column bench test load spectrum is carried out. The load characteristics of four types of vehicle four column bench test are analyzed to determine the similarity of the same wheel in time domain, frequency domain and damage domain under different road conditions, the time domain correlation and frequency domain coherence of left and right wheel loads, and the time delay characteristics between front and rear wheel loads. The power spectrum density distribution of the same wheel is fitted, and the power spectrum covering a certain percentile level is selected as the target to reconstruct one side wheel Time domain load signal; time domain load history of opposite wheel is constructed by integrating correlation and coherence features; load history of rear wheel is constructed based on time delay characteristics of front and rear wheels, and finally standardized load spectrum of vehicle four column bench test is formed. By comparing the time domain, frequency domain, rain flow and damage between the standardized load spectrum and the measured road spectrum, the rationality of the standardized load spectrum is analyzed and verified by a practical SUV bench test. The results show that the standardized load spectrum constructed in this paper can effectively reproduce the failure situation under the test field load, and can provide an effective means for rapid verification of vehicle reliability.
赵礼辉1,2,3,杨鹏1,翁硕1,2,3，冯金芝1,2,3，郑松林1,2,3. 四立柱可靠性试验载荷谱标准化方法研究[J]. 振动与冲击, 2022, 41(5): 251-260.
ZHAO Lihui1,2,3, YANG Peng1, WENG Shuo1,2,3, FENG Jinzhi1,2,3, ZHENG Songlin1,2,3. Standardization method of load spectrum for reliability tests of four poster. JOURNAL OF VIBRATION AND SHOCK, 2022, 41(5): 251-260.
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