Abstract
In is very important to understand the dynamic characteristics to control vibrations of machinery. Generally, the conventional identification methods for experimental modal analysis are employed to time-invariant systems. However, there are a lot of requirements to extract modal parameters of time-varying systems. It is hard to implement the vibration testing for time varying systems, because of excitation difficulties, boundary conditions, etc. In this paper, the subspace algorithm are proposed to obtain time-varying modal parameters. Then, the pseudo-modal parameters are only extracted from output responses. The effectiveness of the proposed time-varying identification algorithm is verified by numerical results. Finally, the procedure is applied to an experimental manipulator model.
