| The development of gear transmission is becoming faster and more powerful,and the dynamic environment in which it is located is also worse than before.Therefore,the vibration characteristics and stability of the gear transmission structure have attracted more and more attention.The dynamic excitation of gear meshing is the cause of vibration and noise.The particle damping technology is introduced into the gear transmission system,and the damper is formed by filling particles in the inner cavity of the structure,so as to achieve the effective purpose of vibration reduction.Particle damping technology is a passive vibration reduction technology.It is the collision of internal particles and mutual friction to achieve the purpose of energy consumption,which can greatly improve the vibration reduction efficiency.Because the granular system is a discontinuous medium,the finite element method is only suitable for solving the problem of continuous media.In order to accurately obtain the motion problems of the particle system and the high-power gear system,so as to more realistically analyze the inherent damping mechanism of the particles in the centrifugal field of the gear,this paper proposes a method of coupling finite element and discrete element in the same calculation model.Aiming at the problem of vibration and noise caused by gear meshing,a discrete element and finite element coupling method based on particle damping technology was proposed.By establishing a gear dynamic model,particle damping is introduced into the gear dynamic response analysis to reduce the vibration of high-power gears.Through the coupling process,the contact force and contact position between the discontinuous medium and the continuous medium are correctly transferred to the corresponding nodes of the finite element analysis model.It realizes the equivalent displacement mapping of gear contact load nodes and transforms the local coordinates into the global coordinates.The effects of particle filling rate,particle size,material,and damper configuration on the dynamic characteristics of the gear system were analyzed,and the vibration characteristics of the gear transmission before and after adding particle damping were tested in combination with the gear vibration test bench.It can well verify the correctness of the finite element and discrete element calculation models.By analyzing the internal damping mechanism of particles in the centrifugal field of gears,and exploring the parameters of the optimal configuration,the non-linear dynamic characteristics of the gear transmission using particle damping are reasonably calculated and predicted. |
