摘要
基于四立柱的台架试验是整车开发过程中可靠性评价的重要方式,当前以试验场整车载荷采集-路谱迭代的试验方式需要对每一个车型均进行实车载荷测量,存在试验周期长且产品可靠性不足时改进成本高等问题。以同一试验场可靠性规范下不同车型载荷相似性基础,开展整车四立柱台架试验载荷谱的标准化研究。分析四种车型整车四立柱台架试验载荷特征,确定各路况下不同车型同一车轮在时域、频域及损伤域的相似性,左右轮载荷时域相关及频域相干、前后轮载荷间时延特征;以同一车轮的功率谱密度分布拟合,选取覆盖一定百分位水平的功率谱作为目标重构单侧车轮时域载荷信号;综合相关和相干特征构造对侧车轮时域载荷历程;基于前后车轮时延特征,构造后轮载荷历程,最终形成整车四立柱台架试验标准化载荷谱。通过对比标准化载荷谱和实测道路谱的时域、频域、雨流、损伤,分析标准化载荷谱的合理性,以某SUV实际台架试验进行实际验证。结果表明,构造的标准化载荷谱有效复现试验场载荷下的失效情况,可为整车可靠性的快速验证提供有效手段。
The bench test based on four poster is an important way of reliability evaluation in process of vehicle development. At present, the test method of whole vehicle load collection-road spectrum iteration in testing ground needs to measure the real vehicle load of each vehicle type, it has problems of long test period and high improvement cost when product reliability is insufficient. Here, based on the load similarity of different vehicle types under the reliability specification of the same testing ground, the standardization study on load spectrum of whole vehicle four poster bench tests was performed. Load characteristics of whole vehicle four poster bench tests for 4 vehicle types were analyzed. The similarity in time domain, frequency domain and damage domain of the same wheel of different vehicle types under various road conditions, time domain correlation and frequency domain coherence of left and right wheel loads, and time-delay characteristics between front and rear wheel loads were determined. By fitting the power spectral density distribution of the same wheel, the power spectrum covering a certain percentile level was taken as the target to reconstruct the time domain load signal of one side wheel. The time domain load history of opposite wheel was constructed by synthesizing correlation and coherence characteristics. Based on time delay characteristics of front and rear wheels, the rear wheel load history was constructed, and finally the standardized load spectrum of whole vehicle four poster bench test was formed. Characteristics in time domain, frequency domain, rain flow and damage of the standardized load spectrum and the measured road spectrum were compared to analyze the rationality of the standardized load spectrum, and the verification was done using the actual bench test of a certain SUV. The results showed that the standardized load spectrum built here can effectively reproduce failure situations under testing ground load, and provide an effective means for rapid verification of whole vehicl
作者
赵礼辉
杨鹏
翁硕
冯金芝
郑松林
ZHAO Lihui;YANG Peng;WENG Shuo;FENG Jinzhi;ZHENG Songlin(College of Mechanical Engineering,University of Shanghai for Science and Technology,Shanghai 200093,China;Key Lab for Strength&Reliability Evaluation of Automobile Chassis Mechanical Parts in Machinery Industry,University of Shanghai for Science and Technology,Shanghai 200093,China;Shanghai Public Technology Service Platform for Reliability Evaluation of New Energy Vehicles,Shanghai 200093,China)
出处
《振动与冲击》
EI
CSCD
北大核心
2022年第5期251-260,共10页
Journal of Vibration and Shock
基金
国家重点研发计划项目(2018YFB0104802)
国家自然科学基金项目资助(51705322)。
关键词
标准化载荷
四立柱
载荷特征
相干函数
相关系数
standardized load spectrum
four poster
load characteristic
coherence function
correlation coefficient
