Study On Vibration Reduction Using Tuned Particle Damper

As one of passive vibration control technologies, dynamic vibration absorber or Tuned MassDamper (TMD) has been used in the building structure vibration suppression for its simple structure,high reliability, and no external energy and so on. But the limitation of TMD is obvious.It can havesound performance at a single frequency or in a very narrow frequency band, but actual engineeringvibration environment is often complex in frequency structure, which makes the TMD hardlyeffective. Now using passive-dynamic vibration absorber technology to suppress the random vibrationof the structure is a hot research topic. Particle damping technology primarily provides damping forvibrating structures through the impact and friction between particles filled in a container on thestrucutre or a structural cavity, and particle damping has attracted more attention for its simplicity,low cost, effectivity, and wide working frequecy bandwidth.This paper introduces a new dynamic vibration absorber with nonlinear damping-Tuned ParticleDamper (TPD) which is based on the classic single mass dynamic vibration absorber and particledamping. Particle damping is used to expand the dynamic vibration absorber working frequency band.The damping particles not only play the role of dynamic mass but also provide broad-band dampingthrough friction and collision. Because the vibration level of the dynamic vibration absorber is muchhigher that the master structure, this leads better particle damping perform as the particles dissipatemore vibration energy in high level vibration environment.Experiments of random vibration are conducted to evaluate the efficiency of TPD applied to acantilever. For modelling, we firstly measure its frequency response function (FRF), and then identifythe damping ratios of the system which can be used to estimate the particle damping. Theexperimental results indicate that TPD can effectively broaden the working band of the vibrationabsorber compared with the classical TMD. In addition, we find that particle damping is an internaldamping of the vibration system and it does not depend on the relative velocity between the masterstructure and the absorber, but on the acceleration of the absorber only, so the heavy particle dampingwill not affect the TPD’s performance, which is the outstanding feature of the TPD.