基于障碍网络颗粒阻尼器的悬臂梁减振特性研究  

Study on Vibration Reduction Characteristics of Cantilever Beam Based on Particle Damper of Obstacle Network

作　　者：蒋捷 杨元龙 强陈 闫超群 陈永辉 夏兆旺 昝浩 JIANG Jie;YANG Yuanlong;QIANG Chen;YAN Chaoqun;CHEN Yonghui;XIA Zhaowang;ZAN Hao(School of Energy and Power Engineering,Jiangsu University of Science and Technology,Zhenjiang 212003;The 701 Research Institute,China State Shipbuilding Corporation Limited,Wuhan 430064;The 711 Research Institute,China State Shipbuilding Corporation Limited,Shanghai 201108)

机构地区：[1]江苏科技大学能源与动力学院,镇江212003 [2]中国船舶集团有限公司第七〇一研究所,武汉430064 [3]中国船舶集团有限公司第七一一研究所,上海201108

出　　处：《机械工程学报》2024年第17期208-222,共15页Journal of Mechanical Engineering

基　　金：中国科学院热能动力技术重点实验室开放基金资助项目(TPL2020003)。

摘　　要：障碍网络颗粒阻尼器是一种在颗粒阻尼器中内置三维网络的减振装置,通过增加颗粒与网络的碰撞与摩擦改变颗粒阻尼器的耗能特性。为研究障碍网络颗粒阻尼器附着在结构上的中低频减振特性,首先在填充比90%及颗粒粒径为2 mm条件下,试验研究了附加障碍网络颗粒阻尼器后的悬臂梁结构在20~800 Hz频段的振动特性。其次,测量了特定频带(20~800 Hz)和激励范围(1~10g)下颗粒阻尼器与障碍网络颗粒阻尼器的损耗因子。最后通过离散元仿真探明了三维网络对附加在悬臂梁上颗粒阻尼器的能量损耗和颗粒运动的影响。研究结果表明,三维网络对于不同振动情况下有不同的影响,就悬臂梁而言,在一阶共振峰处(20 Hz)的减振效果较差,而在二阶(185 Hz)及三阶(520 Hz)共振峰处减振效果明显优于颗粒阻尼器。其原因在于在低频段颗粒运动幅值较大,网络会阻碍的颗粒的运动导致耗能降低;而在中频段网络打破颗粒的团聚效应,使更多的颗粒参与到耗能过程中,有效提升了颗粒阻尼器的阻尼性能。The particle damper of obstacle network is a vibration damping device with a three-dimensional network built into the particle damper.The energy dissipation characteristics of the particle damper can be changed by increasing the collision and friction between the particle and the network.In order to study the vibration attenuation characteristics of the cantilever beam with the particle damper of obstacle network,the vibration characteristics of the cantilever beam with the particle damper of obstacle network attached at the frequency range of 20-800 Hz were experimentally studied under the condition of 90%filling ratio with 2 mm particle size.Secondly,the loss factors of particle dampers and particle dampers of obstacle network in specific frequency band(20~800 Hz)and specific vibration acceleration band(1-10g)are measured.Finally,the influence of the three-dimensional network on the energy loss and particle motion of the particle damper attached to the cantilever beam was investigated by discrete element simulation.The results show that the three-dimensional network has different effects on different vibration conditions.For the cantilever beam,the damping effect at the first order formant(20 Hz)is poor,but the damping effect at the second order formant(185 Hz)and the third order formant(520 Hz)is obviously better than the particle damper.The reason is that the motion amplitude of particles is large in the low frequency band,and the obstacle network will hinder the movement of particles,leading to the reduction of energy dissipation.However,the agglomeration effect of particles broken by the obstacle network in the middle frequency band enables more particles to participate in the energy dissipation process,which effectively improves the damping performance of the particle damper.

关 键 词：颗粒阻尼 障碍网络 悬臂梁 损耗因子 能量耗散 

分 类 号：TB535[理学—物理]