Evaluation of eddy current damper for vibration control of a frame structure
Evaluation of eddy current damper for vibration control of a frame structure
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DOI：
10.1088/2399-6528/ab1deb
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发表时间：
2019-05
影响因子：
1.2
通讯作者：
W. Ao;P. Reynolds
中科院分区：
文献类型：
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作者：
W. Ao;P. Reynolds
在这项研究中，涡流阻尼器（ECD）的原型模型。ECD由三个主要部件组成：钕铁硼（NdFeB）永磁体、铜板（导电材料）和铝框架。磁体具有矩形设计，并且可以在交替或单向取向上以及在两个正交方向上与磁极突出部组装。这种类型的ECD的主要优点是其非接触特性;因此完全没有机械摩擦。本研究探讨此原型阻尼器应用于多层框架结构之减振效果。为了有效地估计的ECD的阻尼性能，简单的分析计算，包括无限和有限的边界，本文提出和说明。这些可以与更复杂的有限元分析（FEA）的结果进行比较。导电材料可以被限定为在两个正交方向上移动。因此，基于四个磁体配置和两个方向的运动的导电材料，共八个模型被创建用于分析和验证所提出的设计公式。结果发现，基于图像的方法的分析提供了一个令人满意的估计的阻尼力，类似于估计使用有限元模型。本研究还包括一个原型ECD应用于抑制振动的六层铝框架结构的实验测试。该测试表明，原型ECD能够提供与理想的常规线性粘滞阻尼器的性能相当的显著水平的阻尼。
In this study, an eddy current damper (ECD) prototype model is presented. The ECD consists of three principal components: Neodymium Iron Boron (NdFeB) permanent magnets, a copper plate (conductive material) and an aluminium frame. The magnets have a rectangular design, and can be assembled with magnetic pole projection in either alternative or unidirectional orientations and in two orthogonal directions. The key merit of this type of ECD is its non-contact characteristic; thus there is a complete absence of mechanical friction. This study examines the use of this prototype damper when applied to suppress structural vibration in multi-storey frame structure. To effectively estimate the damping performance of the ECD, simple analytical calculations involving both infinite and finite boundaries are proposed and illustrated in this paper. These can be compared against the results of more sophisticated finite element analysis (FEA). The conductive material can be defined to move in two orthogonal directions. Therefore, based on the four magnet configurations and two directions of motion of conductive material, a total of eight models were created for analysis and validated by the proposed designed formule. It was found that analysis based on the method of images provides a satisfactory estimation of the damping force, similar to that estimated using the FE model. This study also includes experimental testing of a prototype ECD applied to suppress vibration within a six-storey aluminium frame structure. This testing shows that the prototype ECD is able to provide a significant level of damping with performance comparable to that of an ideal conventional linear viscous damper.