Estimation of modal parameters using the sparse component analysis based underdetermined blind source separation

摘要

The underdetermined blind source separation method based on sparse component analysis in the time-frequency domain is introduced to estimate the modal parameters in this study. This study attempts to reveal the relationship with the modal parameter identification methods based on the time-frequency representation. A five-degree-of-freedom mass-spring-damper system and a real experiment conducted on a TC4 titanium-alloy column are used to confirm the proposed method. Furthermore the proposed method is applied to extract the time-varying modal parameters of the column in the temperature-varying environment. The extracted results evidently show the thermal effect on the modal parameters.