Comparison of the Input Identification Methods for the Rigid Structure Mounted on the Elastic Support

Abstract

For the mechanical structures, noise and vibration is generated during operation, which may give damage to the machine itself and inferior effects to the environments. Therefore, it is strongly demanded to reduce the vibration of mechanical structures. Accuracy of the transfer path analysis (TPA) where the vibration contribution is expressed by the product of the frequency response function (FRF) and the excitation force depends on that of input identification. Therefore, the accuracy of the input identification needs to be improved. In this chapter, accuracy of the identified force estimated by matrix inversion method and that by apparent mass method are compared not only in the frequency domain but also in the time domain the effect of window functions on input identification is also verified.. The apparent mass method has been presented by one of the authors. And also, the input force identification for the rigid structure mounted on the elastic support is presented.