Friction influence on the pounding tuned rotary mass damper: Modeling, numerical simulation and experiment validation

Abstract

The pounding tuned rotary mass damper (PTRMD) has the characteristics of both tuned damper and impact energy dissipation, which is one of the effective ways to improve the control performance of traditional tuned mass damper (TMD). The rolling friction problem on PTRMD which has not been involved in the previous studies has a great impact on the energy dissipation and vibration reduction performance. Therefore, theoretical and experimental studies on the rolling friction problem in PTRMD are carried out in this paper. The motion model and control equation considering rolling friction energy dissipation of the PTRMD are derived based on Lagrange principle. Afterwards, the influence of the rolling friction on damping performance of PTRMD is analyzed by a numerical example. Additionally, a one-story frame structure equipped with PTRMD under different friction materials is designed and made for the impact performance test, rolling friction coefficient measurement and shaking table test to discuss the friction influence on PTRMD. The numerical and experimental results show that the friction effect between the oscillator and the track in PTRMD can greatly improve its energy dissipation and vibration reduction performance. For all the excitations, the greater the rolling friction coefficient of the track in a certain range, the better the control effect of PTRMD. There is an optimal range of rolling friction coefficient for the damper, but the optimal interval is not a fixed interval for different cases, which is related to the structural form, excitation type and intensity, as well as the parameters of the PTRMD itself. The vibration control performance of PTRMD will decrease when this parameter deviates from the optimum.