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为了解决模型修正中所需要模态数据不足的问题,提出了一种基于附加已知刚度的模型修正直接方法。通过给原结构添加刚度系数已知的刚度元件来得到一个新结构,进而得到新结构的模态数据,并联合使用原始结构及新结构的模态数据进行模型修正。在所要修正的参数数目一定的情况下,该方法增加了可以用于模型修正的模态数据,大大降低了所需的模态阶数。分别使用一个25自由度质量弹簧系统及一个长直机翼模型的模型修正算例,验证了该方法的有效性和修正精度。
In order to solve the problem of lack of modal data needed in model correction, a direct model updating method based on the addition of known stiffness is proposed. A new structure is obtained by adding a stiffness element with known stiffness coefficient to the original structure, and the modal data of the new structure are obtained. The modal data of the original structure and the new structure are used in combination to correct the model. In the case of a certain number of parameters to be modified, this method adds the modal data that can be used for model correction, greatly reducing the required modal order. A 25-degree-of-freedom mass spring system and a model of a long straight wing model were used to correct the model respectively. The validity and accuracy of the proposed method were verified.