Influence Factors of Damping Performance in Particle Dampers
Additive manufacturing technology can fabricate lightweight and high stiffness structures with complex configurations based on the structural topological optimization.A new type of powder particle damper can be generated directly by leaving the unmelted metal powder inside the cavity at a specific location of the structure in the fabrication process.The damping performance of this new type of damper is related to the relevant properties of the powder particles,but research in this area is still insufficient.In this connection,discrete element simulation is used to investigate the influence of the relevant characteristics of the powder particles on the damping performance,gravity of the powder particle damper and the volume of the damper cavity.A powder particle damper made of titanium alloy is fabricated,based on which a discrete element model of the powder particle damper is established,and numerical simulations are carried out under a number of different conditions.The results show that particle size,particle elastic modulus,and particle Poisson's ratio have a limited effect on the damping performance of the damper,while the damping performance of the powder particle damper can be effectively improved by increasing the particle density,decreasing the particle friction coefficient,and increasing the damper cavity volume.
additive manufacturingparticle damperscharacteristics of powder particlesdiscrete elementsdamping performance
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