Abstract 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.

中文翻译：

---

附着在振动结构上的粒子阻尼器阻尼行为的数值和实验研究

摘要 颗粒阻尼是一种被动阻尼技术，其中颗粒材料要么填充在与振动结构相连的盒子中，要么填充在嵌入在振动结构中的孔中。由于结构振动，动量传递给彼此相互作用的颗粒材料。结果，能量通过粒子之间的碰撞和摩擦现象耗散。在本文中，离散元模型与简化的有限元模型相结合。它可以在很宽的频率范围内进行分析。通过实验验证了准确性。试验台由一个由激振器激发的具有自由边界条件的光束组成，其速度分布由激光扫描测振仪测量。颗粒阻尼器填充有不同的钢球。离散元素代码使用连续接触模型。使用有效的接触算法，同时与结构的有限元模型耦合可以预测整个系统的运动。该系统在多个本征模式的宽频率范围内进行分析。进行了实验和模拟的第一次比较，表明频率响应和模态参数具有良好的一致性。阻尼高度依赖于粒子盒的位置及其填充率。进行了实验和模拟的第一次比较，表明频率响应和模态参数具有良好的一致性。阻尼高度依赖于粒子盒的位置及其填充率。进行了实验和模拟的第一次比较，表明频率响应和模态参数具有良好的一致性。阻尼高度依赖于粒子盒的位置及其填充率。