Numerical and experimental investigations in the damping behavior of particle dampers attached to a vibrating structure
Numerical and experimental investigations in the damping behavior of particle dampers attached to a vibrating structure
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DOI：
10.1016/j.compstruc.2020.106281
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发表时间：
2020-10
影响因子：
4.7
通讯作者：
N. Meyer;R. Seifried
中科院分区：
文献类型：
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作者：
N. Meyer;R. Seifried
颗粒阻尼是一种被动阻尼技术，其中颗粒材料填充在附接到振动结构的盒子中或填充在嵌入振动结构中的孔中。由于结构振动，动量被传递到彼此相互作用的颗粒材料。本文将离散元模型与简化有限元模型相结合，建立了一个简化的有限元模型。它可以在很宽的频率范围内进行分析。实验验证了该方法的准确性。该试验台由振动台激励的自由-自由边界条件的梁组成，用激光扫描测振仪测量其速度分布。颗粒阻尼器填充有不同的钢球。离散单元代码使用连续接触模型。采用有效的接触算法，同时与结构的有限元模型耦合，可以预测整个系统的运动。系统在宽频率范围内进行了多个本征模态的分析。实验和仿真的第一次比较显示出良好的协议的频率响应和模态参数。获得了对颗粒箱的位置及其填充率的阻尼的高度依赖性。
Particle damping is a passive damping technique at which granular material is either filled in a box attached to a vibrating structure or it is filled in holes embedded in the vibrating structure. Due to the structural vibrations, momentum is transferred to the granular material which interacts with each other. As a result, energy is dissipated by impacts and frictional phenomena between the particles.In this paper, a discrete element model is combined with a reduced finite element model. It can be analyzed for a wide frequency range. The accuracy is validated by experiments. The testbed consists of a beam with a free-free boundary condition excited by a shaker and its velocity profile is measured with a laser scanning vibrometer. The particle damper is filled with different steel balls. The discrete element code uses continuous contact models. An efficient contact algorithm is used while a coupling with a finite element model of the structure enables the prediction of the overall system movement.The system is analyzed over a wide frequency range for multiple eigenmodes. The first comparisons of experiments and simulations are performed showing a good agreement of the frequency response and modal parameters. A high dependency of the damping on the position of the particle box and its filling ratio is obtained.