Study On The Performance Of TMD-NES Composite Structure Tuned Damping Control

Nonlinear energy sink(NES)is a kind of passive tuned damping device with nonlinear stiffness.Compared with the classical linear tuned mass damper(TMD),the optimized NES can generate instantaneous internal resonance capture behavior with the main structure.Due to the wide absorption frequency band of the nonlinear internal resonance,it is expected to provide a wide frequency control for the instantaneous seismic response of the structure.In this study,the advantages of TMD and NES are integrated,and the form of TMD and NES composite tuned damping control device is proposed and its damping control performance is studied.The main work includes the following aspects:(1)In this paper,a kind of tuned damping device with TMD and cubic nonlinear NES is proposed.According to the typical analysis model,TMD-NES,negative stiffness NES and traditional linearized TMD control mode are compared and analyzed.The results show that when the stiffness of the main structure degenerates significantly,the TMD-NES device still shows a relatively stable damping effect,and its damping control effect is not sensitive to the change of the peak acceleration of the input seismic wave.(2)By using wavelet analysis,the response law of TMD-NES control system is observed in time and frequency domain.It is found that in the process of seismic wave input,the TMD-NES device not only produces 1:1 instantaneous internal resonance capture behaviorwith the main structure degree of freedom,but also produces 3:1 instantaneous internal resonance behavior.Compared with the classical TMD,TMD-NES has a wider frequency absorption bandwidth,which provides a mechanism explanation for the strong robustness of tmd-nes.(3)This paper studies the influence of limit vibration on the damping control performance of TMD-NES.Considering the influence of the input seismic peak value,the mass ratio of the tuning device to the main structure,the elastic recovery coefficient and the impact vibration clearance,the robustness of the damping control system after the impact vibration is analyzed.The results show that under the optimal parameter control,the additional optimized elastic vibration bump device can further improve the damping control performance of TMD-NES device.(4)In this paper,a vibration control system of TMD and cubic nonlinear NES in parallel is proposed.The global parameters of TMD-NES in parallel are optimized by using pulse excitation to design the optimal joint vibration control system.The frequency and energy robustness of TMD-NES are analyzed,which are the same as those of TMD-NES.And for the typical analysis model,TMD-NES parallel device,negative stiffness NES and traditional linear TMD are compared and analyzed.The results show that the nonlinear energy sink plays an important role in damping control and the linear TMD plays an auxiliary role in the TMD-NES parallel device under the condition of the original structure stiffness,while the linear TMD part of the TMD-NES parallel device plays a role in tuning the nonlinear energy sink when the main structure frequency is reduced.