小角度翻转法质量质心测量及误差分析

质量质心是重要的质量特性参数,对飞行姿态模拟与理论计算具有重要意义。工程上在确定纵向质心位置时通常采用小角度翻转法。本文主要对质量质心测量的系统误差展开深入研究,推导了质量质心系统误差的理论解析表达式,论证了在利用翻转法测量纵向质心时翻转角度的优选方法。针对文中待测模型,仿真与计算结果表明,当翻转角度约为10°时,纵向质心误差有最小值。通过比较实测误差与理论误差,表明理论误差计算对实测误差的预判有一定的参考意义,可为质量质心台的工程设计提供一定的指导。

Centroid Measurement and Error Analysis with Small Angle Flip Method

Mass and centroid are important mass characteristic parameters,which are of great significance for simulation and theoretical calculation of flight attitude.In engineering applications,the small angle flip method is usually used to determine the position of the longitudinal centroid.In this paper,the systematic error of mass and centroid measurement are mainly studied,the theoretical analytical expressions of mass and centroid system errors are deduced,and the optimized method of flip angle when measuring the longitudinal centroid is demonstrated.For the model to be tested in the paper,the simulation and calculation results show that the longitudinal centroid error has a minimum value when the flip angle is about 10°.By comparing the measured error with the theoretical error,it shows that the theoretical error calculation has a reference value for the prediction of the measured error,and could provide some guidances for the engineering design of the mass and centroid platform.