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提出一种基于全等变换的模态转换方法，可将振动台模态试验获得的模态，转换成结构处在自由状况下的模态。对方法的合理性做了论述，并佐以例证。
A modal transformation based on congruent transformation is proposed, which can convert the modal obtained from the modal test of shaking table to the modal with the structure in a free state. The rationality of the method is discussed, and accompanied by examples.