在结构自由振动分析中，动力刚度法是一种精确算法。
The dynamic stiffness method is exact for structural free vibration analysis.
其次在理论方面，采用简单的单自由度系统作为模型，用集中质量和刚度，采用解析法对系统进行动力学分析。
At the theories aspect, the adoption simple single freedom degree the system as a model, using concentrated quality and just degree, analysis the system dynamics problem as analyze method.
采用增量变塑性刚度迭代法，求解非线性动力方程。
The incremental variable plastic stiffness iteration method is employed to solve dynamic equations.
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