Study On Vibration Control And Temperature Effect Of Pounding Tuned Mass Damper （PTMD）

Engineering structures response dynamically under external dynamic loads,and the large response amplitudes can affect the users’ experience and even the structural safety.The research on structural vibration control technology is of great significance to ensure the safety and performance of structures with high flexibility and low resistance under rare dynamic loads.The pounding tuned mass damper（PTMD）is one of the newest concept passive control dampers,which combines the advantages like the energy absorption of conventional tuned mass dampers（TMD）and high energy consumption of impact dampers.PTMD has been proved to be effective in vibration control experiment on non-structural elements,and has better robustness than TMD,thus more promising in the engineering application.At present,PTMD mainly uses viscoelastic materials as the impact boundary.However,in the past researches,the energy dissipation characteristics of the viscoelastic material are heavily affected by temperature.How the mechanical properties of viscoelastic materials change with temperature has rarely been studied under the short-time high-strain rate load of collision.Given the above issues,the research contents of this article are as follows:（1）A single-degree system was designed and manufactured according to the experimental requirements,and then a new type of the pendulum PTMD was designed to control the vibration of the single-degree system.The basic parameters of the singledegree system were identified through free and forced vibration experiments.According to the optimal parameter design theory of single-sided PTMD,the parameters of PTMD were reasonably set to achieve the optimal vibration control effect.In free vibration and forced vibration experiments,the effectiveness of PTMD and its robustness at different excitation frequencies were verified,which serve as a foundation for further studies on the working characteristics of the viscoelastic PTMD.（2）With the vibration experimental system,the vibration control effect of the viscoelastic PTMD at-20 ℃ ～45 ℃ was studied in a temperature control laboratory.Temperature influence on the control effect of PTMD in two loading modes,i.e.the free vibration and forced vibration,was tested.The experimental data analysis verified that the PTMD is of good robustness,which provided a reference method for engineering application and popularization.（3）In order to investigate the effect of temperature on vibration control of PTMD,a pendulum impact force experimental device was designed to identify the impact force parameters of viscoelastic materials.The impact force model parameters were substituted into the coupled dynamic equation of PTMD-structure,and the simulation analysis was carried out through the Runge-Kutta method.The comparation between simulation and experiment results proved the simulation model as effective.（4）With the simulation model,the vibration control effect of PTMD was simulated and analyzed changing the impact force parameters.Finally,the impact force parameter identification experiments were repeated at-20℃,8℃ and 40℃,which demonstrated that the impact force parameters do change along with the temperature variation.