小发动机推力矢量的测量

Thrust vector measurement for small engine

关键词:  发动机  推力向量控制  推力测量  向量运算  最小二乘法  推力偏差  推力偏心角

Key words:  Engine  Thrust vector control  Thrust measurement  Vector operational  Least square method  Deviation of thrust  Thrust misalignment angle

摘要:

针对小发动机推力矢量的特点和测量要求 ,在分析二轴转台数学模型的基础上提出了间接测量推力矢量的线性组合法 ,最后给出误差计算公式。通过转台的旋转和伸缩形成不同的试验工况 ,得到测量数据的超定方程组 ,再用最小二乘法解矛盾方程求得推力矢量的方向角和偏移量。经多次试验表明 ,用该方法测量推力矢量参数的不确定度远小于± 5% ,超过了原定技术要求

Abstract:

A two axial rotating table was designed to measure the thrust vector of small engine used for satellite According to the characteristics of thrust vector and the requirements of measurement of small engine, a linear combination method was made for the indirect measure of thrust vector based on the analysis of the mathematical model of the two axial rotating table Firstly,an overdetermined system of equations of measured data was built up by rotating and stretching the rotating table, then the thrust vector parameters were calculated with least square method applied to the overdetermined system of equations The experimental results show that the uncertainty of measurement of thrust vector is in ±5%, in the allowable range of predefined technical requirements