基于典型路况车身加速度提取及其影响因素分析

Acceleration Extraction and Influencing Factors Analysis of the Vehicle's Body Based on Typical Road Conditions

通过搭建载荷谱测试采集系统,按试验规范采集了4台不同载荷的试验车载荷谱,并准确提取多种强化路面的车身加速度信号。由此在时域内计算各试验车在多种强化路上的加速度均方根,得到强化路与普通路均方根的相对值。根据车轮-车身双质量振动模型分析汽车行驶速度、路面、车身载荷对车身加速度均方根值的影响,结合实际采集数据进行统计分析。结果表明,加速度均方根和相对值受强化路面影响较大,在一定的范围内取值,并与车速约成0.009线性相关,与载荷负相关,随载荷的增加变小,低载时变化不明显,载荷增加趋势明显。这一结论可为汽车性能评价和使用载荷的选取提供依据。

A load spectrum acquisition system is built. The load spectrums of four different loading cars are collected according to the test standard, and the acceleration signals of the vehicle body for different strengthened road surfaces are extracted accurately. On this basis, the acceleration root mean square（RMS） of each tested vehicle is calculated in the time domain, and the values of the RMS of the provided ground rough roads relative to the RMS of the normal road are obtained.According to the wheel-body double mass vibration model, the influences of vehicle speed, road surface condition and vehicle load on the body＇s RMS acceleration are analyzed. The results show that the RMS values and the RMS relative values of the acceleration are greatly influenced by the strengthened road surface condition in a certain range, linearly correlated with the speed of the vehicle, and negatively correlated with the load. They decrease with the increasing of the load and vary slightly under the low load. This conclusion can provide a basis for vehicle performance evaluation and load selection.