针对定常解析非线性系统进行能控性分析，采用微分方程级数解法得到状态方程的一般级数解，用作能控性分析的基本依据。
For the controllability of constant non linear system by using the progression method, the general progression solution of state equation is obtained.
提出了用初始层校正法求解机电耦合系统状态方程组的方法，获得了问题的渐近解析解。
In this paper, a method of using initial layer correction to solve the electromechanical coupled systems is submitted, an asymptotic solution of analysis are obtained.
在实际工程可靠度分析中，得到极限状态方程的解析表达式是非常困难的。
Usually it is very difficult to get an analytical equation of limit state for reliability analysis of the stability of tunnel.
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