Energy Dissipation Characteristics Study Of Particle Dampers Under Non-gravity And Microgravity And Study On Collection Of Active Particles

It has important theoretical significance and application value that the study on the characteristics of particle damping energy loss and the collection of self moving active particles. The article,used the soft sphere model(DEM), simulates particle damper movement in non-gravity and microgravity, and studies the energy loss principle and law under different amplitudes by the computer;at the same time we also study the changes of collection efficiency of arc collector and V type collector with different open radian in the active particle system.(1) In non-gravity, when the amplitude is less than the critical amplitude the particle is in a gas state, and the energy loss of the system increases linearly; when the amplitude is greater than the critical amplitude, the particle is in a solid state,which is in synchronous vibration with box.And the energy dissipation rate shows a nonlinear change in the system; At critical amplitude the energy loss rate reaches the maximum, and the energy loss rate of two states of the particle has a jumps.Due to the different energy loss of the particles in two states of the particle,the energy loss rate of the system has a jump.(2) In the microgravity, with amplitude increaseing the particle also shows two states.When the amplitude is larger than a critical amplitude, the vibration acceleration is far larger than the gravity, then the particles are in synchronous vibration with box at the solid state. when the amplitude is less than the critical amplitude, due to the action of gravity particles show a state that part partcles gather in the middle,and other particles are in the back and forth vibration between both sides of the box and the particles in the middle. At this time the energy loss of the system increases with the amplitude increaseing gradually,transition to another state without a jump.(3) When the opening radian of arc collector and V type collector is larger or smaller the collection efficiency is not very high. The collection efficiency reached a maximum near the center.Different particle filling ratio also affects the particle collection efficiency.When the particle filling ratio is high the particle collection efficiency as a whole are relatively high. The maximum collection efficiency of arc collector at the larger filling ratio appears in smaller openings radian and at the smaller filling ratio appear in the large opening radian. However, the maximum collection efficiency of the V type collector appears in the opening angle0??60, andthe particle filling ratio has no effect on the opening angle at which maximum collection efficiency appears. Compared with the arc collector, the collector efficiency of the V type collector is obviously lower than that of the arc collector. Due to the force of the Lennard-Jones potential interacting with self-driving force with invariant direction, there are some adsorption phenomena in the active granular systems.