Research Of Rigid-Particle Coupling Dynamics On Bulk Vibration Systems

Bulk systems are one complicated kind of non-linear dynamical systems composed of a large number of tiny particles which interacts.Its rigid-particle coupled characteristics are determined by the interaction between the macro-rigid system and the micro-particle system.Bulk vibration systems are mainly used for industrial production field,for example: transportation,dispersing,mixing,screening,crushing,grinding,etc.In this paper,two kinds of typical rigid-particle coupled systems are investigated.In these systems,traits of particles are invariant.Additionally,according to their relative size of interaction between rigid system and particle system,they are classified into two different kinds: one is the particle damper with larger influence from particle system on rigid system,and the other is the vibration conveyer with larger influence from rigid system on particle system.The research of this paper will also provide important theoretical guide for the study of particle system,and has important reference value for the engineering application.Particle damper can be applied to the horizontal damping of high-rise object,which is of great practical significance.In this paper,dynamic analysis method is used to establish rigid dynamic model,whereas DEM is used to establish particle dynamic model.To make it closer to reality,I choose Hertz contact model to simulate the contact pattern of particles.Secondary development of DEM software(PFC3D4.0)is also promoted for later numerical simulation research on the rigid-particle coupled systems.Firstly,the damping mechanism and the structure parameters optimization of the particle damper are researched and analyzed by rigid-particle coupled program.The force incentive of vibration system will be updated immediately,so I can obtain the rules of how the damping performance of the vibration system in the horizontal direction is influenced by the particle damper's structure parameter,such as density,size,filling ratio of damping media and the number of cavity,et al.Secondly,as regards the research of particle damper that is applied in high-rise object to resist horizontal ground motion,five strings wave of earthquake is added as the basis incentive to the vibration system.Furthermore,the particle damper is analyzed and compared with tuned mass damper(TMD),from which I can obtain the rules of how the particle damper affects the high-rise object in the earthquake,and prove its value in the field of engineering application.Finally,using rigid-particle coupled program,I study and make a rigid-particle coupled dynamic analysis of the vibration conveyor.Besides,thesingle-particle and multi-particle model of vibrating conveyor have also been compared and analyzed,while the layer research on materials in the multi-particle model has been conducted,followed by the rules of how different layers influence the vibrating conveyor.Within research on rigid-particle coupled bulk vibration systems dynamics,this paper made a numerical simulation research,which can also set up the experimental platform for further research in the future.