The relationship between the load input and the strain output is important to the design and use of the design and use of the helicopter.The Load calibration equation of the helicopter is multiple linear.Leaving the important variables out of the equation or putting the non-significant variables into the equation will reduce the accuracy of load calibration, the variable is screened by the stepwise regression.Thus, the optimal parameter combination of independent variable is obtained, which can get the regression equation with high precision.The method has been successfully applied to the flight test.%直升机在研制和使用的过程中需要建立结构件的输入载荷与应变电桥之间的定量关系,即载荷标定方程.直升机载荷标定方程是多元线性方程,遗漏了重要的变量,或者将不显著的变量也选入方程,会降低了载荷标定方程的精度.针对载荷标定试验数据,采用逐步回归法将变量一个个引入,对已选入的变量进行逐个检验,将不显著的变量剔除,从而得到最优的自变量参数组合,以此得到精度高的回归方程.此方法已成功应用于直升机载荷的飞行实测.
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