Abstract: Barycenter position of vehicle is closely related to vehicle driving safety. The accurate measurement of the barycenter position is of great significance for the structural design of vehicles. Base on measuring principle of barycenter, the authors analyze influencing factors of barycenter and measure barycenter of one Dura-axle vehicle according to GB/T 12538—2003. The result shows that the height value of barycenter is different when lifting vehicle for smaller angle, so when measuring the height of barycenter to avoid lifting smaller angle. The authors process actual barycenter data using the method of least squares to fitting. The height value of barycenter is uniqueness and accuracy by calculating the data after fitting.

Key words: Dura-axle vehicle; Brycenter position; Least squares method

摘要： 车辆质心位置与车辆行驶安全性息息相关。质心位置的准确测量对于车辆的结构设计 有很重要的意义。文章通过质心位置的测量原理，分析了质心位置准确性的影响因素，同时 根据 GB/T 12538—2003 中的方法对某一车型进行质心位置测量。测试结果表明，在举升较小 角度的时候测量得到的质心高度值有较大误差，所以在测量质心高度的时候要避免举升较小 角度。在数据处理过程中使用最小二乘法对实际测量的轴荷值进行拟合，通过拟合后的数值 计算得出的质心高度值保证了唯一性和准确性。

关键词: 两轴车辆；质心位置；最小二乘法；数据处理