汽车转动惯量的测定

提出了一种获得汽车悬挂质量绕其质心的转动惯量的新方法·该方法采用道路制动试验,通过对试验过程中所采集到的车身垂直振动加速度信号进行的频谱特征分析,得到了其角振动固有频率,最后建立车身振动模型,通过计算得出其转动惯量;并以SY622B轻型客车为例,对其计算值与真实值进行比较,其误差仅为1%,充分满足工程精度要求;表明该方法在实际应用过程中的切实可行性和精确性·同时该方法也可应用于其他车型的转动惯量的测定·

Determination of Cars' Moment of Inertia

A new method was proposed to determine the moment of inertia of the sprung mass of a car around its mass center. An on-the-road brakeage test should be done first. Analyzing the characteristics of the frequency spectrum of those vertical vibration acceleration signals which were acquired from the test, the inherent angular frequency was obtained. A vibration model was thus developed for car body to calculate the moment of inertia. A SY622B minibus was taken to exemplify the model and the calculated value with measured value of the moment of inertia. The error is shown only 1% that will meet completely the precision requirement in engineering. The method is accurate and applicable to the measurements of moment of inertia of various types of car.