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在对机械进行模态分析后．需要对结构进行动态特性的优化改进。本文提出和改进了三种分析方法，从理论上和计算方法上进行了论证。而通过实例的计算得到了较好的结果。
After modal analysis of the machine. Need to optimize the dynamic characteristics of the structure. This paper proposes and improves three analysis methods, and demonstrates it theoretically and computationally. And through the calculation of the examples, good results have been obtained.