The Shape And Material Parameters Of Damper Affect Energy Dissipation Based On Contact Mechanics

Particle damping technology is new vibration passive control technology which developed since1990’s in the field of vibration control. It canmake use of the structural pre-existing voids or enclosures attached to structure to partially fill with particles. When the structure moves,the particles collide with each other and with the enclosure causing damping through inelastic of nearly collisions, and convert kinetic energy into heat or sound energy.At same time,the momentum conversion between particles and structure can also suppress the dynamic response of primary system.It enjoys a lot of advantages such as:it can be used in a wide range of environment,the structures are modified hardly,additional mass to the system is minimum,and the effect of vibration absorption is notable etc.all of them make it to be used widely in the future.At present,the researches on particle damping are falling to doing,and the theories are not far away from satisfactory.In this paper,some theoretical model and simulation are introduced to study the dynamic characteristics of particle damping, and some technique are used to control and improve the performance of particle damper.The dissertation includes:1.To the basic theory of discrete element method, in summary of predecessor studying establish the DEM contact model.2. Using the classical Hertz theory, establish damping particle and damper sub-mechanical model in single impact cycle, using the mechanical model can easily obtaine particles and damper state of motion in the key nodes,thus to geting the energy characteristics of the collision process.And establishing models with ANSYS then import the models into DYNA for crash simulation, by comparing with the simulation results and the theoretical model results, Verification the established theoretical model is correctness. Using the theoretical model discussed various materials parameters of damper impact the law of damping energy dissipation.3. Studied in detail damping particles and the damper oblique collision process by simulation, various materials parameters of damper impact the law of damping energy dissipation.4. Based on powder mechanics, establishing friction energy model of particle damping, and verify the the model is correctness in ANSYS. And using the model discussed various materials and shape parameters of damper impact the law of damping energy dissipation in detail.