MIV算法选取应变电桥在载荷建模中的应用

摘要

The strain bridge method play an important role of the measurement of flight loads,and its measurement accuracy is directly related to the selection of the strain bridge.Based on the basic theory of load measurement,using the MIV algorithm selected strain bridge,the comparison analysis of load equation and error under different bridge combination,and given test error of the test condition.The results show that,with the decrease of the number of strain bridges,the test error decrease,and then the trend of gradual change and the final increase;The measurement accuracy of bending moment and shear load based on MIV algorithm is within acceptable range.%应变电桥法是飞机飞行载荷测量的一种重要方法,其测量精度与应变电桥的选择有直接的关系.基于载荷测量基本理论,提出利用MIV算法选取应变电桥,对比分析了不同电桥组合下的载荷方程及其误差,并给出了检验工况下的检验误差.结果表明:随着应变电桥个数的减少,检验误差呈先减少然后平缓变化,最后增大的趋势;基于MIV算法获得的弯矩和剪力载荷测量精度均在可接受范围内.