Host: The Japan Society of Mechanical Engineers
Name : Dynamics and Design Conference 2023
Date : August 28, 2023 - August 31, 2023
The structural modal parameter describes the dynamics of a target structure. Structural health monitoring uses the identified modal parameters. In order to identify these parameters, the excitation force (input) and its response (output) are necessary. This study focuses on the input generation method. The input suitable for identification has two requirements. The first requirement is that the frequency property of the input is tunable so that the input can excite the structural vibration including the modal frequency. The second requirement is that the energy consumption of the input generation is small so that the structural identification can perform frequently. Conventional inputs such as an active input generated from actuators and signal amplifiers as well as a passive input (disturbance) did not satisfy these two requirements. In the vibration control research, a semi-passive control has been proposed as a smart vibration suppression method. The semi-passive input is tunable, and its generation method is energy-saving. We incorporate the semi-passive control into the structural identification. This study presents a semi-passive control strategy suitable for identification and validates the performance of modal parameter identification using semi-passive control. The validation experiment used a 2-degree-of-freedom structure as an identification target structure. The semi-passive identification achieved the identification of the 50 kg structure using 68 mJ.
