Mechanical Performance Analysis And Vibration Control Using A Self-centering Inertial Mass Damper

It is known that vibration control device in the structure can effectively reduce the vibration response of the structure.Since TMD(tuned mass damper)systems usually require large space,it is difficult to meet the requirements for some structures.Many studies have examined the inertial mass can be obtained by transforming the horizontal motion into a rotary motion of mass.In this paper,a new damper is proposed based on the gear-inerter system.The principle property of the inerter damper is analyzed.The practicality of the damper is verified by establishing mechanical model,nonlinear analysis of collision,parameter optimization and vibration control analysis.The main research contents and results are as follows:(1)The mechanism of components of the damper and the amplification mechanism of the inertial mass are analyzed.Considering the contact effect,inertia and components interaction mechanism,a mechanical model of the damper is established.The collision and friction effects of the damper are analyzed using ADAMS.Considering the different gear modulus and resonant excitation frequency,the response results show that the smaller the gear modulus,the higher the transmission efficiency of the system.(2)Based on the fixed-point theory and the equivalent linearization method,the optimized values of the damper are obtained by reducing the structural response amplification factor,R.Comparing with the optimized results of numerical model,the effectiveness of the equivalent linearization method is verified.(3)The time-history analysis method is utilized to analyze the vibration control performance of a structure with and without damper.The results of the single-degreeof-freedom structure show that,comparing with the viscous damper,the displacement vibration reduction ratio is increased by up to 34.86%,and the acceleration vibration reduction ratio is increased by up to 20.2%.This result indicates that the new damper has positive control performance.In addition,a multi-degree-of-freedom structure model with weak first floor setup is analyzed.Considering different damper installations,the results show that the optimal setup of dampers is only installed at the bottom floor.Compared with viscous damper,the acceleration reduction ratio can be enhanced by about 20%.