Experimental Study Of Vibration Damping Performance Of Particle Dampers

Single particle impact dampers produce large noise and impact forces when colliding and are sensitive to changes in design parameters,so researchers have replaced a single solid mass block with many small equal-mass particles,resulting in particle dampers.Particle dampers are a kind of additional mass type passive dampers for the purpose of increasing structural damping.This damper is filled with tiny particles in some limited closed space of the main structure and consumes the system vibration energy through the impact and friction between the particles,which has the advantages of good durability,high reliability,insensitivity to temperature changes and applicability to harsh working environment.In order to clarify the vibration damping performance of the particle dampers,this paper uses a 50 cm high aluminum frame structure and a 75 cm high aluminum frame structure as the research objects and designs and fabricates the particle dampers.Through the test,the self-oscillation frequency of the particle dampers was calculated.The vibration characteristics of the structure under simple harmonic and seismic waves were studied by shaking table tests,and the amplitude curves were derived.The effects of parameters such as material,size and mass of the particles in the dampers on the vibration damping effect of the particle dampers were analyzed.The results show that;(1)Particle dampers can reduce the displacement of the structure during vibration.(2)The effect of the particle dampers with different masses and different diameter spheres on the vibration reduction of the structure varies.(3)Under the action of irregular waves,the particle dampers have good damping effect,and the top displacement and acceleration of the structure are significantly reduced.(4)Under different heights of the frame,the frame itself has different self-oscillation frequencies,so different simple harmonic waves are selected on the shaking table for vibration.The mass and diameter of the damping particles have some influence on the self-oscillation frequency of the structure.The larger the mass,the smaller the self-oscillation frequency of the frame,but the overall frequency is similar to that of the frame of the same height without particle damping.(5)In tests with frames of different heights,either steel or lead beads as damping particles can significantly reduce the displacement of the structure,and there exists an optimal effect of particle damping.(6)In the case of a certain mass,the particle dampers selected with different diameters and materials have similar effects on structural vibration reduction.Particle dampers selected by the mass on the structure of the vibration damping effect is more obvious。(7)The frame with additional particle damping has a better damping effect under various seismic waves.Under the action of seismic waves,the particle dampers have good damping effect,and the structural displacement and acceleration are reduced during vibration,and the structure tends to stabilize more rapidly after the vibration stops.(8)Under the same quality,the particle damping performance is better than that of viscous damping.The particle dampers are obviously smaller in size,easier to access,and more flexible in layout.