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A novel tuned visco-elastic damper for floor vibration abatement.

机译：一种用于地面减振的新型调谐粘弹性阻尼器。

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摘要

The main goal is to study the viability of tuned dampers with VE polymers as their damping or combined damping and resilient element(s) for dampening large civil engineering structures with emphasis on floors. Two design configurations are pursued in this study using both numerical (FEA) and experimental techniques. The first configuration relies on the VE polymer mainly as the damper and uses a leaf spring as the elastic element (design A, also dubbed sandwich beam design) and the other relies on VE polymer as both spring and damper (design B).;In exploring design A, based on sandwiching VE material between two layers of steel beams commonly used in realizing small tuned VE dampers, a large number of iterations varying the thickness and width of VE material were analyzed using FEA. All the analyses indicating insufficient damping commensurate with high stiffness requirement of large TMDs; the numerical predications were verified experientially. Considering the fact that VE material is mainly responsible for providing damping in this design, not stiffness, a relatively small volume of this material was needed to realize a realistic TMD, resulting in inadequate damping.;Design B, a novel design using VE rubber rings as the resilient and damping element constrained by thin aluminum rings between layers, turned out to be a quite promising TMD for dampening civil engineering structures. The aluminum layers are to enhance the shear deformation mechanism in the VE ring; in addition, with proper thickness they would help removing the heat from the VE material preventing an undesirable rise in their temperature. The effectiveness of this design in terms of their load carrying capacity and damping is numerically analyzed using the ABAQUS finite element software package. The analytical results are validated experimentally in the laboratory; the frequency response function plots show a good agreement between the numerical and experimental results with various number of the rubber ring layers. Damping ratios in excess of 30% are achieved using six VE rubber ring layers.
机译：主要目标是研究以VE聚合物为阻尼材料或组合阻尼和弹性元件的VE调谐阻尼器的可行性，以阻尼大型土木工程结构（重点是地板）。本研究使用数值（FEA）和实验技术进行两种设计配置。第一种配置主要依靠VE聚合物作为阻尼器，并使用片簧作为弹性元件（设计A，也称为夹心梁设计），另一种配置同时依赖VE聚合物作为弹簧和阻尼器（设计B）。在探索设计A中，基于将VE材料夹在通常用于实现小型VE阻尼器的两层钢梁之间的方法，使用FEA分析了改变VE材料的厚度和宽度的大量迭代。所有分析表明，阻尼不足与大型TMD的高刚度要求相对应。数值预测得到了验证。考虑到在这种设计中VE材料主要是提供阻尼而不是刚性的事实，因此需要相对少量的这种材料来实现逼真的TMD，从而导致阻尼不足。;设计B，一种使用VE橡胶环的新颖设计由于弹性和阻尼元件受到层间薄铝环的约束，因此对于阻尼土木工程结构而言，它是一种很有前途的TMD。铝层将增强VE环中的剪切变形机制；另外，具有适当的厚度，它们将有助于从VE材料中除去热量，从而防止其温度出现不希望的升高。使用ABAQUS有限元软件包对这种设计在承载能力和阻尼方面的有效性进行了数值分析。分析结果在实验室进行了实验验证；频率响应函数图显示了不同数量的橡胶环层的数值和实验结果之间的良好一致性。使用六个VE橡胶环层可实现超过30％的阻尼率。

著录项

  • 作者

    Al -Rumaih, Wail Saad.;

  • 作者单位

    University of Dayton.;

  • 授予单位 University of Dayton.;
  • 学科 Engineering Mechanical.
  • 学位 Ph.D.
  • 年度 2009
  • 页码 155 p.
  • 总页数 155
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 机械、仪表工业;
  • 关键词

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