整车四立柱台架试验中目标谱的加速方法研究

THE ACCELERATION OF FOUR COLUMN BENCH FOR VEHICLE LABORATORY ROAD SIMULATION TEST IN THE TARGET SPECTRUM METHOD RESEARCH

汽车试验场道路载荷谱中包含大量的高频低幅值载荷,实测载荷谱的加速处理是建立整车四立柱台架试验的关键一步。以某轿车汽车试验场实测载荷谱为基础,结合累积疲劳损伤理论和低载强化理论,提出了一种新的小载荷删除原则,应用该准则对试车场实测载荷谱进行编辑处理,生成试验加速谱。从幅值域、伪损伤和频率域多方面对加速谱的有效性进行理论验证。结果表明该方法在保留损伤,保证损伤载荷特征和频域特征的基础上实现了加速。最后,通过建立整车台架试验,试验中出现了与汽车试验场一致的失效模式,验证了该载荷谱加速方法的合理性。该方法可为其他车型的整车四立柱台架试验载荷谱的加速编制提供一定的参考。

Load spectrum obtained from automobile proving ground contains a large number of high frequency low amplitude loads,so the key step of establishing four-column bench test of a vehicle is to conduct the acceleration processing of measured load spectrum. Based on the measured load spectrum of a certain car ＇s proving ground,combined with fatigue cumulative damage rule and low-load strengthening theory,a new principle that named low-load deletion was put forward. With the application of this principle in editing measured load spectrum, the accelerated test spectrum could be generated. The effectiveness of accelerated spectrum was theoretically verified from amplitude domain,pseudo damage and frequency domain.The results showed that,on the basis of retaining damage,together with ensuring the damage of load features and domain features,this method had achieved the acceleration. Finally,in the process of establishing vehicle bench test,the failure mode was consistent with that existed in automobile proving ground,so the rationality of load spectrum＇s speedup method was verified.The method could provide a reference for accelerating the draw up of other models＇ four-column bench test load spectrum.