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.
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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