Analysis Of The Damping Mechanism And Parameter Design Of Adaptive Viscoelastic Pounding Tuned Mass Dampers(P-TMD)

As a passive control device,tuned mass damper's application is limited due to its inherent tonality and adaptability under different excitation.The vibration reduction effectiveness has been questioned,especially under earthquake excitation.Many researches have been conducted in order to broaden its application and improve its control effectiveness and adaptability.But some of its inherent defects remain unresolved,such as the frequency sensitivity,poor adaptability,installation difficulty of quality units,etc.In addition,some improvement method has greatly increased the cost,making device impractical.In earlier researches,some scholars put forward a new type of damper—Pounding Tuned Mass Dampers(P-TMD),which improved the TMD's frequency control and damping adaptability by merging the viscoelastic layer into traditional TMD device and increasing the energy dissipation via collision.Based on previous theoretical research results,further study is conducted on vibration reduction mechanism and the effects of parameters design.Main contents and achievements include:(1)The horizontal vibration reduction P-TMD device is designed and implemented according to the mechanics model of the P-TMD damper.At the same time,the working state of the apparatus is reviewed and related patents are published.(2)A shaking table test was designed,with the P-TMD device installed in a small frame structure,to test the P-TMD control effect under harmonic excitation and earthquake excitation.The results show that P-TMD has better control effect,especially the improved control effect of structural acceleration response,compared with traditional TMD,P-TMD has better control effect,especially the improved control effect of structural acceleration response.To the improvement of acceleration control effect,peak response under harmonic excitation can reach 31.60%,and root mean square value of up to 40.70%;Peak and RMS value response can reach 21.94%and 29.67%,respectively under Tangshan earthquake excitation.It can amount to 17.19%and 21.59%respectively under Kobe earthquake excitation.(3)The finite element model of quality unit device and the process of collisions with viscoelastic layer of P-TMD is established.The traditional Hertz collision force model is then improved through the results of the finite element simulation.In combination with the collision force model,the mechanical model of the P-TMD damper is proposed and the vibration equation of P-TMD control system is further improved.(4)Based on the mechanics model of the P-TMD damper and the vibration equation of the controlled system,simulation analysis was further optimized on the controlled system.Shaking table experiment results and the Simulation comparison results show that the P-TMD damper has better control effect than traditional TMD damper.The accuracy of the collision force model and mechanical model of the P-TMD damper are also verified.