| The vibration and noise from gear transmission have great damage on the mechanical equipment and operators.Through inelastic collisions and friction between particles,the energy can be dissipated in gear transmission.When particles moves the same time,the discrete characteristics make them different from the other objects.In this process,because of different values of the coefficient of restitution and friction coefficient,the microscopic properties between the particles and the macro characteristics of the particle system may have different performance.A dynamic model of particle dampers in gear transmission was put forward in this paper.The performance of particle dampers in centrifugal fields under different rotational speeds and load was investigated.The surface properties such as the impact of coefficient of restitution and friction coefficient of the particle on the damping effect were analyzed and the total energy loss was obtained by discrete element method(DEM).The vibration from time-varying mesh stiffness was effectively reduced by particle dampers and the optimum coefficient of restitution was discovered under different rotational speeds and load.Then,a test bench for gear transmission was constructed,and the vibration of driven gear and driving gear were measured through a three-directional wireless acceleration sensor.The research results agree well with the simulation results.While at relatively high speed,smaller coefficient of restitution achieves better damping effect.As to friction coefficient,at relatively high speed,the energy dissipation climbs up and then declines with the increase of the friction coefficient.The results can provide guidelines for the application of particle damper in gear transmission. |
