Constitution And Damping Principle Of A New Pounding Tuned Rotary Mass Damper

The promotion of prefabricated structures and implementation of structural vibration control technology are important approaches for the development of building industrialization and high-performance structural systems.In order to reduce the amount of field operations and member self-weights,a variety of cavity floor system has been widely used in engineering.Using a large number of cavities distributed in such a floor,this paper proposes a new energy-absorbing and vibration-damping device.The device has a wide range of application prospects for the advantages of not affecting the function of the structure,the convenience of manufacture,and the flexibility of arrangement in the structural plane and height direction.The device is not only limited to using in the cavity floor system,it can also be applied to the damping control of any engineering structure.The new energy dissipation device,Pounding Tuned Rotary Mass Damper(PTRMD)is consisted by a mass(rolling ball),curved orbit and viscoelastic limiting device fixed on the orbit.Combines the characteristics of the existing Tuned Rotary Mass Damper(TRMD)and the Pounding Tuned Mass Damper(PTMD).Considering the dynamic characteristics of a system with a PTRMD-controlled structure,it can be assumed that the PTRMD-controlled structure vibration system is a model with two degrees of freedom.The dynamic equations of the PTRMD-controlled structure system are established using Lagrange principle,and the response of the PTRMD-controlled structure under free vibration and forced vibration is solved by analytical method and a high-precision direct integration method(HPD),respectively.It compares it with the existing TRMD and PTMD,and analyzes its control effect on the structure.Firstly,the effect of the PTRMD on the control of the controlled structure under free vibration is studied.The comparison of the vibration reduction effect under different collision angles is conducted to study the optimal collision damping mechanism of the PTRMD.Then by analyzing the control effect of the PTDMD on the controlled harmonic excitation at different frequencies,the effective frequency range of the PTRMD on the structure control is studied.Then,from the perspective of displacement and energy,the vibration absorption effect of PTRMD on structures under four different seismic waves is discussed.Finally,the change law of the vibration absorption effect of PTRMD under different parameters is studied from the perspectives of PTRMD's device parameters,external excitation and the characteristics of the controlled structure.The results show that the optimal collision mechanism of PTRMD is that the ball collides with it twice during one motion cycle of the controlled structure.In addition,the PTRMD proposed in this paper can effectively consume energy and reduce vibration when the structure is free-vibrated or forced-vibrated,and it performs better than the existing TRMD and PTMD in both the damping rate and the effective damping frequency range.The influence of the four parameters of the mass ratio,the impact angle,the amplitude of the seismic wave acceleration and the damping ratio of the controlled structure on the vibration-absorption effect of the PTMRM is studied,which provide theoretical basis for damper parameter design of the PRTMD when applied to the practical engineering combined with the cavity floor system in the future.