Abstract
Machine condition monitoring and diagnosis have become increasingly important, and the application of these processes to beam structures and rotating machinery has been widely investigated. The authors previously proposed a stepwise primary diagnosis method using a force identification approach. The method is that the location of the abnormality is firstly estimated using the force identification approach based on the transfer function. When the proposed method is applied to a complex structure, a finite element has many nodal forces. This means that many sensors are required. And the vibration test using an exciter is difficult for the actual structure. Thus in this study, impact test using an impact hummer is adopted for the vibration test, that is one of the improvement methods of regularization. The accuracy of the identification result of the location of abnormality and the relationship of the locations of the abnormality and the impact test are discussed for a beam structure using the previous expression of the virtual additional force. As a result, the correct location of abnormality can be obtained by averaging the results for various excitation frequencies, and the dispersion of the estimation is small when the locations of abnormality and the impact are close.
