基于固有频率向量的模型修正方法

Based on the concept of natural frequency vector and natural frequency vector assurance criterion (NFVAC), a new model updating method is proposed. In this method, the natural frequency vector assurance criterion is used to verify the correlation of natural frequency vectors of the structures before and after updating. At first, an initial dynamic model of the structure is built using FEM or other method to obtain the initial parameters such as mass and stiffness matrix, natural frequencies and modes, and then the natural frequency vector assurance criterion is used as the object function of optimization to obtain the optimal orientation and amplitude of the natural frequency vector. The updating procedure of this method is described in details and an 8-stories shear frame test model is used to demonstrate the efficiency of the proposed method. The results show that using this method, the updated model agrees very well with the test model.