Aim: To measure mass, centroid and centroidal deviation of projectile body.
目的：对弹体的质量、质心及质偏进行测量。
Equipment mass were simulated by mass elements which were created at centroid of those equipment and linked with the mounting base on the car-body through spring elements.
在各设备质心位置创建质量单元，用弹簧单元将质量单元与底架上相应设备的支点连接起来以模拟设备质量的影响。
The result shows that the influence of basic frequency affected by the mass block of vehicle body structure and its location of centroid is nonlinear.
结果表明，车体结构上的质量块及其形心位置对基频的影响是非线性的。
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