Estimation of the Unmeasured Terms of FRF Based on the Substructure Synthesis

During the process of obtaining the overall frequency response based on the method of FRF substructure synthesis,the frequency response of the joint between substructures,which is significant influenced by the frequency response of interface degree of freedom,has great impact on the result.Considering the experimental difficulty in obtaining the frequency of response of interface degree of freedom due to the complexity of the joint between substructures,this work proposed a method that can be employed in computing the interface contains multi-degree of freedom.By using the frequency response of degrees that is more easier to get through the experiments,this method illustrates how to calculate the rotational frequency response,thus obtaining the overall information of the interface degree of freedom that is required in the FRF substructure synthesis.And several numerical examples validate the effectiveness of this method.