Abstract
This paper is concerned with the system identification method of vibrating structures by the virtual instrument software. The proposed identification method have two stages. The first stage is the signals processing by bandpass filter. In this stage, the signals of the multi-degree of freedom system reduce to the signals of the single-degree of freedom system. The second stage is the curve fitting by the nonlinear least square method. The dynamic characteristics of structure are estimated by the impulse response function of the single-degree of freedom system. For the bandpass filter process, the digital filter method and Fourier transform method are examined. As numerical simulations and experiments, it is shown that the proposed identification method enable to estimate highly degree of accuracy the dynamic characteristics for structures.
