HIGH ACCURATE ESTIMATION OF STRUCTURAL VIBRATION-FREQUENCY BY AMBIENT VIBRATION WITH AR MODEL

To detect the natural frequencies of the structures under subjection of various external forces, high accurate structural identification is indispensable. Also, automated monitoring system would be effective for long term vibration-monitoring at site. For the purpose of establishment of the High Accurate Structural Vibration-Estimation Method and realization of the automated measurement system, the authors proposed an analytical method, which consists of AR model by the structure's ambient vibration. This paper shows the details of the method and the results of simulation on an arch-bridge, held to verify its efficiency. As a result, this method was verified to be efficient for distinguishing the structure's proper frequencies from external ones in details.