基于质量线法的驾驶室惯性参数识别试验研究

准确的驾驶室惯性参数，包括质量、质心位置、转动惯量和惯性积等，是整车动力学分析的基本参数。本文以某国产重卡整备驾驶室为研究对象，利用LMS数据采集系统测量频率响应函数，采用称重法获得重卡驾驶室的平面质心位置。从频率响应函数中提取质量线计算质心位置，与称重法结果进行对比，X方向误差为1.99cm，Y方向误差为0.68cm。该结果表明质量线法具有较高的测量精度。计算整备驾驶室的转动惯量、惯性积、主惯性矩和惯性主轴方向，并对引起试验误差的原因进行分析。

Experimental Study on Identification Inertia Parameters of the cab Based on the Mass Line Method

Accurate inertia parameters of the heavy truck cab, including the mass, the position of mass center, the moment of inertia and the product of inertia, and so on are basic parameters of the whole vehicle dynamic analysis. A domestic heavy truck cab has been studied. The Frequency Response Functions (FRFs) are obtained by LMS data acquisition system. The center of mass in the XY plane of the cab is obtained by the weighing method. And the center of mass of the cab is calculated based on the mass line which is extracted from the FRFs. The center of mass in the XY plane extracted from experiment data and that measured by weighing method are compared. The result of the comparison is that the error in X direction is 1.99cm and the error in Y direction is 0.68cm. This result indicates that the mass line method has good measurement precision. Then the moment of inertia, product of inertia, principal moment of inertia and principal axis direction are obtained. Finally, the reasons of the error have been analyzed and discussed.