Abstract:In order to further improve the vibration reduction performance of the traditional constrained damping structure, the non- obstructive particle damping technology is introduced. The vibration reduction performance of constrained damping structure based on non- obstructive particle damping technology was used to investigate by particle motion analysis and cantilever beam test, and the influence of particle filling rate, particle size and density on vibration response and composite loss factor of structure was discussed. The results show that with the increase of filling rate, the composite loss factor increases at first and then decreases. When the filling rate is 50%, the maximum loss factor is 0.1447, which increases by 60.78%. It takes 0.2578s for the amplitude to stabilize. At this time, the particles move violently in blocks, and the damping effect is the best. The particle size of filled steel ball with equal diameter increased from 0.8mm to 2.0mm, the composite loss factor increased by only 0.0015, and the time spent on stabilizing the amplitude was only 0.0039s, which had no obvious effect on the vibration reduction performance of the structure When the mass ratio of filled steel ball particles with different diameters is 1:1, the maximum composite loss factor is 0.1591, which is further improved by 10%. When the mass of filled particles is the same, the material with small density has the best vibration reduction effect, while the material with large density is better when the volume is unchanged. It is concluded that filled particles based on non- obstructive particle damping technology can improve the vibration reduction performance of constrained damping structure.