Application of Viscoelastic Tuned Mass Damper (VE-TMD) to control the Floor High-Frequency Micro-Vibration of High-Tech Factory
Date Issued
2011
Date
2011
Author(s)
Sung, Kuo-Yu
Abstract
This study investigates the mechanisms of viscoelastic tuned mass damper (VE-TMD) in reducing the floor vibrations in high-tech buildings of the first vertical mode. The so-called VE-TMD is a device composed of a viscoelastic damper and a mass block, in which the stiffness and viscous features of the device are offered by viscoelastic materials. In this study, the TMD is designed according to Hartog’s method, to verify the feasibility of reducing the vertical vibrations of floors through both numerical and experimental approaches.
The content of this study is divided into two major parts. The first part is the numerical simulation part. With the commercial software SAP2000, the numerical models for the floors of high-tech buildings are set up with shell elements, solid element and beam elements. Applying harmonic loadings of different frequencies at the center of the floors and then comparing the dynamic responses (displacements, velocities, and accelerations) of the floors with and without TMD, the effects of TMD in reducing vibrations can be evaluated. The second part is the experimental verification part. A simple algorithm for testing the material properties of present viscoelastic dampers is presented in this study. The algorithm includes two tests: the static test and dynamic test. The purpose of the static test is to select a qualified viscoelastic damper that satisfies the design requirements out of several samples. The selected damper is then subjected to a dynamic test for the purpose of obtaining the properties of the rubber material in the damper, including the stiffness, natural frequency, and damping ratio.
Although the material properties of the damper samples do not fully satisfy the design requirements for the building floors herein due to the limited number of samples available, the objective of this study in presenting an algorithm for testing the dynamic characteristics of the VE-TMD is achieved, hence offering a guideline for further improvements and selections in viscoelastic dampers.
Subjects
VE damper
TMD
VE-TMD
high-tech factory
vertical vibration
Type
thesis
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