Abstract
The Sompi method has been used to a spectral analysis method applied in the geoscience field and the analysis of volcanic earthquakes. By applying the acquired complex vibration data to the autoregressive process, it can be decomposed into wave components and noise components. This analysis method can be decomposed even at the same frequency damping ratio, so it is useful for evaluating the vibration characteristics of the structures. In this research, the purpose is to clarify the vibration characteristics of the structure using the Sompi method, and the validity of this method was verified by numerical simulation and excitation experiments. In the numerical simulation, the data obtained by synthesizing the damping waveform and the noise is generated and decomposed into the wave component and the noise component by the Sompi method. Furthermore, it was confirmed that it is possible to discriminate components of the same frequency with different damping ratios. In excitation experiments, experiments were conducted using impulse excitation to simple cantilever, and the first to third order natural frequencies and damping ratios were obtained by the Sompi method. In addition, changes in natural frequency and damping ratio when a weight was attached to a beam could also be confirmed by analysis by Sompi method.
