Abstract

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Title:: Vibration Damping Performance and Robustness of PTRMD in Multi-degree Freedom Structure

Author(s):: LI Shu-jin; DU Zheng-kang; KONG Fan; SHEN Shao-bo; School of Civil Engineering and Architecture, Wuhan University of Technology

Keywords:: vibration control; pounding tuned rotary mass damper; vibration damping performance; robustness; multi-degree freedom structure

Abstract:: A new pounding tuned rotary mass damper(PTRMD) was introduced for vibration control of multipledegree freedom structure. The damping performance of PTRMD in multidegree freedom structure system and the robustness of the damper in frequency detuning were studied. The piecewise motion equation was derived from the Lagrange equation, and then extended to the multidegree freedom structure. The motion equations for the multidegree freedom system controlled with PTRMD were established, and solved by numerical method. The control performances of an actual 6story structure with PTRMD and tuned rotary mass damper （TRMD） were compared both in free vibration and forced vibration. At the same time, the robustness of damper when the frequency of damper deviates from the optimal frequency was analyzed. The results show that the PTRMD can effectively reduce the structural displacement response and get satisfactory vibration control performance. Compared with TRMD, PTRMD has many advantages, such as good damping performance, wide control bandwidth, strong applicability, little influence of damper frequency variation, and has a wider application prospect.