基于非阻塞性颗粒阻尼技术的填充颗粒对约束阻尼结构减振性能的影响

为使传统的约束阻尼结构的减振性能进一步提高,引入了非阻塞性颗粒阻尼技术,通过颗粒运动状态分析和悬臂梁试验研究了填充颗粒对基于非阻塞性颗粒阻尼技术的约束阻尼结构减振性能,探讨了颗粒填充率、粒径和密度对结构的振动响应、复合损耗因子等阻尼特性的影响规律.结果表明:随着填充率的增加,复合损耗因子呈先增大后减小的趋势,当填充率在...

Influence of filled particles on vibration reduction performance of constrained damping structure based on non-obstructive particle damping technology

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.