复摆法测量箭弹转动惯量和质偏及其误差分析

基于复摆原理，阐述了箭弹的质偏和转动惯量的测量方法及装置，推导出了质偏和转动惯量的计算公式。对影响测量精度的因素进行了分析。给出测量结果的不确定度计算公式，在假定各测量参数误差为正态分布条件下，导出了测量结果的极限误差计算公式。同时还进行了实例计算和实验测试。结果表明，用复摆法测量弹箭的质偏和转动惯量是可行有效的，其测量精度可满足工程实际要求。该方法采用刀口支承，且在测试中工装简单，便于操作，特别适用于中小弹体的质偏和转动惯量的测量。

The Measurement of Inertia Moment and Centroidal Deviation of Rocket Projectile with Compound Pendulum Method and Its Error Analysis

Based on the principle of compound pendulum, the measurement method and corresponding equipment for the centroidal deviation and the rotary inertia of rocket projectile were described. The. calculation formulae of the centroidal deviation and the rotary inertia were deduced, and the factors in?fluencing measurement accuracy were analyzed. The calculation formulae of uncertainty of measure?ment results were presented, and on the assumption that the errors of all measured parameters are of normal distribution, the calculation formula of limit error of measured results was deduced. The practi?cal example calculation and experimental test were conducted. The result shows that the method is fea?sible and efficient, and the measurement accuracy can meet the practical requirement of engineering. This method uses the knife edge as the support, and the corresponding equipment is simple and easy to operate, which is especially suitable to the medium and small-sized shell body.