Damping prediction of particle dampers for structures under forced vibration using effective fields
Damping prediction of particle dampers for structures under forced vibration using effective fields
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DOI：
10.1007/s10035-021-01128-z
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发表时间：
2021-08-01
期刊：
影响因子：
2.4
通讯作者：
Seifried, Robert
中科院分区：
文献类型：
--
作者：
Meyer, Niklas;Seifried, Robert
粒子阻尼是一种有前途的阻尼技术，适用于各种技术应用。然而，它们的非线性行为和众多的影响参数阻碍了目前其广泛的实际应用。到目前为止，大多数研究人员要么关注确定阻尼器内部的能量耗散，要么关注与结构耦合时的整体阻尼行为。事实上，目前这两种方法之间几乎没有发生知识交换。在这里，通过将粒子阻尼器的能量耗散场和有效粒子质量场与振动结构的简化模型耦合，建立了一座桥梁，将受迫振动下的系统的两种技术结合起来。因此，可以非常快速地估计结构的整体阻尼。这两种技术的结合对于整体高效的尺寸标注过程至关重要，并且还提供了对动态过程的更深入的理解。通过一个简单的应用示例证明了所提出的耦合方法的准确性。因此，首先使用振动台设置在大激励范围内分析粒子阻尼器的能量耗散和有效质量。颗粒阻尼器表现出不同效率的多个区域。使用有限元法和模态简化技术对底层结构进行建模。通过耦合这两个部分，表明使用粒子阻尼器可以对结构的多个本征模态进行高度阻尼。使用所开发的耦合程序进行的阻尼预测通过带有粒子阻尼器的整体结构的实验进行了验证。
Particle damping is a promising damping technique for a variety of technical applications. However, their non-linear behavior and multitude of influence parameters, hinder currently its wide practical use. So far, most researchers focus either on determining the energy dissipation inside the damper or on the overall damping behavior when coupled to a structure. Indeed, currently almost no knowledge exchange between both approaches occurs. Here, a bridge is build to combine both techniques for systems under forced vibrations by coupling the energy dissipation field and effective particle mass field of a particle damper with a reduced model of a vibrating structure. Thus, the overall damping of the structure is estimated very quickly. This combination of both techniques is essential for an overall efficient dimensioning process and also provides a deeper understanding of the dynamical processes. The accuracy of the proposed coupling method is demonstrated via a simple application example. Hereby, the energy dissipation and effective mass of the particle damper are analyzed for a large excitation range first using a shaker setup. The particle damper exhibits multiple areas of different efficiency. The underlying structure is modeled using FEM and modal reduction techniques. By coupling both parts it is shown that multiple eigenmodes of the structure are highly damped using the particle damper. The damping prediction using the developed coupling procedure is validated via experiments of the overall structure with particle damper.