模拟公路运输的随机振动试验谱及调整方法研究

文章介绍了国内外相关标准中推荐的模拟公路运输的随机振动试验谱。针对实测数据,利用正态容差极限法通过包络处理的基本步骤制定模拟运输试验谱。并根据多体动力学仿真结果提出了一种根据车速、道路等级变化对包络谱进行调整的方法。在制定模拟公路运输的随机振动试验谱时,应当优先选择利用跑车试验数据制定的试验谱,其次选择类似产品的试验谱并适当调整。在不具备以上两种条件的情况下,再选择国内外相关标准中推荐的试验谱。

Adjustment method for random vibration test conditions in simulations of road transportation

Three main sources of random vibration test spectra for simulated road transportation tests are discussed in this paper, including the recommended test spectra in the international general standards, and in the Chinese national, military and aerospace standards. The Normal Tolerance Limitation method is used to establish the simulated road transportation test spectrum for the field test data, and with a basic procedure to build an envelope. A PSD envelope adjustment method is proposed for the multibody dynamic simulation according to the speed of the vehicle and the road grade. It is indicated that in conducting the simulated road transportation test, the test spectrum from the field test data should be used first, then the adjusted PSD envelope is chosen from similar products. If both these sources are not available, the test spectra from the relevant standards can be adopted.