This paper analyzes the nonlinear deformational process of the envelop structure and the cause of stiffness matrix singularity in details.
本文详细地分析了囊体结构的非线性变形过程及刚度矩阵出现奇异的原因；
By simplifying diagnosis equations, the relation between testing frequency and matrix singularity is established to identify the existence of equation's solutions directly.
通过化简故障诊断方程，建立灵敏度矩阵的奇异性与测试频率的关系，从而直接判断故障诊断方程的可解性。
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