用于大型结构振动处理的粘弹性调谐质量阻尼器

W. S. Al-Rumaih, A. Kashani
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引用次数: 0

摘要

粘弹性调谐质量阻尼器(TMDs)采用市售的小厚度粘弹性调谐质量阻尼器(VE)材料,已广泛用于为轻型结构增加目标阻尼。在这些调谐装置中实现刚度和阻尼的最常见方法是将VE材料以无约束或约束层的方式应用于弹性材料(主要是金属,例如钢),并使用此类组件,可将其视为阻尼叶弹簧,用于调谐质量阻尼器的悬挂元件。在这项工作中,通过数值和实验研究了粘弹性阻尼叶弹簧悬架调谐质量阻尼器对大型、大型土木工程结构(更具体地说是楼板系统)的适用性。这种调谐质量阻尼器配置的有效性是令人失望的。与上述研究平行,设计了一种替代VE悬架,将多个25 mm(1英寸)厚的VE环与相同数量的金属约束环层相互堆叠。通过改变这些环的数量,可以实现不同的刚度,从而获得不同的调谐频率。两项研究中使用的VE聚合物的材料性质都是根据proony系列参数定义的。将proony系列参数视为优化变量,通过最小化proony系列参数预测的动态材料性能与制造商提供的频率相关动态材料性能之间的均方误差来恢复它们。利用VE材料的材料特性,建立了100 lb TMD的动态有限元模型,并对其调谐阻尼效果进行了数值验证。此外,还建立了100 lb TMD,并用于a)验证数值模型和b)实验验证TMD的性能。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
A Viscoelastic Tuned Mass Damper for Vibration Treatment of Large Structures
Viscoelastic (VE) tuned mass dampers (TMDs) using commercially available, small thickness, VE material have been used extensively in adding targeted damping to light structures. The most common approach for realizing stiffness and damping in these tuned devices has been applying VE material to strips of elastic material (mainly metal, e.g. steel) in an unconstrained or constrained layer fashion and using such assemblies, which can be viewed as a damped leaf-springs, for the suspension element of the tuned mass damper. In this work, the suitability of tuned mass dampers with visco-elastically damped leaf-spring suspension for treating large, massive civil engineering structures, more specifically floor systems, was studied numerically and experimentally. The effectiveness of this tuned mass damper configuration turned out to be disappointing. In parallel to the above-mentioned study, an alternative VE suspension was devised by stacking a number of 25 mm (1 inch) thick VE rings interlaced with the same number of metal constraining ring layers. By changing the number of these rings, different stiffness’s are realized and thus different tuning frequencies are achieved. The material properties of the VE polymer used in both studies are defined in terms of Prony series parameters. Viewing the Prony series parameters as optimization variables, they are recovered by minimizing the mean squared error between the dynamic material properties predicted by the Prony series parameters and the frequency-dependent dynamic material properties provided by the manufacturer. Using the material properties of the VE material, the dynamic finite element model of a 100 lb TMD was constructed and its tuned damping effectiveness demonstrated, numerically. The 100 lb TMD was also built and used to a) verify the numerical model and b) experimentally demonstrate the performance of the TMD.
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