基于时域损伤编辑法的整车道路模拟试验谱编制

SPECTRUM COMPILATION FOR VEHICLE ROAD SIMULATION TEST BASED ON TIME CORRELATED FATIGUE ANALYSIS WITH DAMAGE EDITING METHOD

整车道路模拟试验需要真实再现车辆的服役载荷,传统的载荷谱编制方法已无法满足其对试验谱的要求,因此急需采用一种能完好保留服役载荷特征的试验谱编制方法。通过分析比较几种常用的编谱方法,发现时域损伤编辑法可在完好保留服役载荷各项特征(幅值、频率、加载次序和多通道相位)的同时,实现试验时间的缩短,是适用于道路模拟试验的一种有效的编谱方法。以某轿车试验场实测载荷谱为基础,应用该方法生成了试验加速谱。从幅值域和频率域对加速谱的有效性和合理性进行了理论验证,发现加速谱在缩短试验时间的同时,完好保留了原始载荷谱的损伤值和各项特征。最后,应用该试验谱建立了整车耐久性台架试验,试验结果与汽车试验场试验相一致,进一步验证了该方法的正确性。

Vehicle road simulation test should reflect the vehicle service loads actually, traditional load spectrum compilation methods were unable to meet the requirements of road simulation test. Therefore it is necessary to apply a load spectrum compiling method which can retain characteristic of the service load. In this paper, Several kinds of load spectrum compiling methods are compared and analysized, and time correlated fatigue analysis with damage editing method is considered to be the most effective, because it can maintain all the properties of service load （amplitude, frequency, loading sequence and multi-channel phase） over an accelerated time. Based on proving ground collected loading spectrum of the test vehicle, this method was applied to generate test spectrum. The effectiveness and validity of the accelerated spectrum were verified theoretically from amplitude domain and frequency domain. The results have shown that the test time of the accelerated spectrum was significantly reduced while simultaneously the damage value and properties of the original spectrum were well maintained. Finally, vehicle bench durability test was conducted, and the same test results have been acquired as those of field test. The validness of this methodology was demonstrated.