| Summary: | 碩士 === 國立雲林科技大學 === 營建工程系碩士班 === 96 === For most structure, the input force vibration experiment usually difficult to control. For applying the ambient vibration measurements to conduct the system identification of civil structures, it is most popular to first adopt the random decrement method to transfer an output signal into a free vibration history. Any convenient time-domain method can then be utilized to identify the modal parameters. The random decrement method, however, is strictly valid only if the excitation input is a stationary white noise. This assumption is usually difficult to satisfy in the case of civil structures. In a recent study by the authors, a novel multiple random decrement method for accurately identifying the parameters of various cable modes was developed to completely exclude the excitation effect. With the combination of a mode separation technique, this method was successfully applied in the cable system where all the modal frequencies are uniformly distributed. It is further explored in this study to extend this multiple random decrement method for its application to building structures where the modal frequencies are irregularly distributed and can be very close to each other.
|
|---|
