Effect of friction on a pounding tuned rotary mass damper and its experimental study

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Journal of Vibration and Shock ›› 2021, Vol. 40 ›› Issue (14) : 186-194.

LI Shujin1,WU Datao1,YANG Changjuan1,KONG Fan1,ZHANG Yuanjin2

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Abstract

Theoretical and experimental studies on the rolling friction problem in a pounding tuned rotary mass damper(PTRMD) were conducted.By introducing the friction energy dissipation mechanism and using Lagrange principle, the control equation considering the rolling friction energy dissipation of the PTRMD was derived, and the influence of rolling friction on the damping performance of the damper was analyzed by numerical solution.The rolling friction coefficients of different materials were measured by high-speed camera and computer image processing technology.A single degree of freedom structure model was designed and made, and the shaking table test was carried out on a controlled structure equipped with PTRMD with different friction material.The friction effect on the PTRMD under free vibration, forced vibration and earthquake excitation was studied.The results show that the friction effect between the ball and the track in the PTRMD can improve its energy dissipation and the working performance.For all the excitations, the greater the rolling friction coefficient of the track in a certain range, the better the control effect of the PTRMD.However, there is an optimal range of rolling friction coefficient for the damper, and too small or too large coefficient is not conducive to the vibration reduction of PTRMD.

Key words

vibration control / pounding tuned rotary mass damper(PTRMD) / friction energy dissipation / shaking table test / rolling friction

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LI Shujin,WU Datao,YANG Changjuan,KONG Fan,ZHANG Yuanjin. Effect of friction on a pounding tuned rotary mass damper and its experimental study[J]. Journal of Vibration and Shock, 2021, 40(14): 186-194

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