摘要
颗粒阻尼技术是一种被动减振降噪技术,已成功应用于多个领域。根据填充颗粒的空心圆柱体建立仿真模型,通过搭建的试验台,进行试验数据采集和分析,验证仿真模型的有效性。采用离散单元法(Discrete element method,DEM),在仿真模型基础上研究颗粒材料类型、粒径、数目、初始位移量等参数变化对结构振动特性的影响规律;同时还研究该阻尼结构的隔振效果。研究表明:随着颗粒阻尼器中颗粒数目增加,结构减振效果先增强后减弱;其他条件相同时,减小粒径可有效提高减振水平;所选材料中,钢颗粒减振效果较好;初始位移量越大,减振效果越好;当激励频率大于√2 f0(f0为结构固有频率)时,该颗粒阻尼器具有良好隔振效果。该模型算法可为机械构件减振性能设计提供重要参考。
Particle damping technology is a passive vibration and noise reduction technology,which has been successfully applied in many fields.In this study,a simulation model of a hollow cylinder filled with particles was established,and the experimental data was collected and analyzed through the test bench,which verified the effectiveness of the simulation model.Discrete element method(DEM)was used to study the influence of the material type,size,number,and initial displacement of particles on the vibration characteristics of the structure on the basis of the simulation model.At the same time,the vibration isolation effect of the damping structure was also studied.The results show that as the number of particles in the particle damper increases,the structural vibration damping effect is initially enhanced and then weakened.When the other conditions are the same,reducing the particle size can effectively improve the vibration damping level.Among the selected materials,steel particles have the best vibration damping effect.The larger the initial displacement,the better the damping effect.When the excitation frequency is greater than √2 f0(f0 is the natural frequency of the structure),the particle damper has a very good vibration isolation effect.The model algorithm provides an important reference for the design of vibration damping performance of mechanical components.
作者
刘艳
梁要
陈亚楠
李秋彤
涂田刚
LIU Yan;LIANG Yao;CHEN Yanan;LI Qiutong;TU Tiangang(Shanghai Research Institute of Materials,Shanghai 200437,China;Shanghai Engineering Research Center of Earthquake Energy Dissipation,Shanghai 200437,China;School of Environmental and Material Engineering,Shanghai Second Polytechnic University,Shanghai 201209,China)
出处
《噪声与振动控制》
CSCD
北大核心
2021年第4期13-18,共6页
Noise and Vibration Control
基金
国家自然科学基金青年基金资助项目(51708422)
上海市青年科技启明星计划资助项目(19QB1401100)。
关键词
振动与波
振动控制
颗粒阻尼
离散单元法
等效阻尼比
隔振
vibration and wave
vibration control
particle damping
discrete element method(DEM)
equivalent damping ratio
vibration isolation
