Then the high order model was reduced by the modal aggregation method.

采用模态集结法对其高阶模型进行降阶。

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The classical displacement expansion theorem and the modal aggregation principle are discussed at the beginning of the paper.

首先回顾经典的位移展开定理和模态叠加原理。

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The classical displacement expansion theorem and the modal aggregation principle are discussed at the beginning of the paper.

首先回顾经典的位移展开定理和模态叠加原理。

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