非线性功能函数可靠性分析的等效替代法

For the realiability analysis of original-function of high nonlinear extent，a method was proposed which bilinear function was equivalent to the primitive functions.The bilinear function by FORM was rotated a certain angle around one of its point,and made the straight line after the rotation coincides with the tangent of the point on the original function,the equivalent substitution of the faliure zone of original functions was received through comparing the relative position of linearization point and FORM.At last ,a validation which was conducted by Monte Carlo simulation proved that this method had a high accuracy.