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A Study on Adjustable Tuned Mass Damper to Reduce Floor Vibration due to Machinery
|關鍵字:||Tuned mass damper;調諧質量阻尼器;Floor vibration;Full-Scale experiment;樓板振動;實尺寸試驗||出版社:||土木工程學系所||引用:||1.Soong TT, Dargush GF. Passive Energy Dissipation Systems in Structural Engineering. Wiley : New York, 1997. 2.Inman, DJ. Engineering vibration. Prentice Hall: Englewood Cliffs, NJ, 1994; 250-257. 3.Lin CC, Hu CM, Wang JF, Hu RY. Vibration control effectiveness of passive tuned mass dampers. Journal of the Chinese Institute of Engineers 1994; 17: 367-376. 4.Lin CC, Wang JF, Ueng JM. Vibration control identification of seismically-excited MDOF structure-PTMD systems. Journal of Sound and Vibration 2001; 240: 87-115. 5.Fhram H. 1911. Device for Damping Vibration of Bodies, U.S. Patent No. 989-958. 6.Wirsching PH, Campbell G.C. Minimal structural response under random excitation using the vibration absorber. Earthquake Engineering and Structural Dynamics 1974; 2:303-312. 7.McNamara RJ. Tuned mass dampers for buildings. 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Double least squares approach for use in structural modal identification. Journal of Spacecraft and Rockers 1986, AIAA, 24(3): 499-503. 31.Wowk V. Machinery vibration: Measurement and Analysis. McGraw-Hill: New York, 1991; 202-204. 32.Colin G. Gordon, Generic Criteria for Vibration-Sensitive Equipment, SPIE Proceedings 1991, Volume 1619. 33.C.Q. Howard, C.H. Hansen. Vibration analysis of waffle ﬂoors. Computers and Structures 2003; 81: 15-26.||摘要:||
This study deals with the optimum design of a tuned mass damper (TMD) for mitigating machine-induced vertical vibration of structures. Theoretically, a TMD without damped tuning of the machine operating frequency provides the optimum control performance. Considering the fact that zero damping is impossible, and since there are many uncertainties in structural modal parameters and machinery excitation frequencies, this study proposes a new field-based design procedure and an adjustable vertically moving TMD (VTMD) to obtain the optimum vibration reduction.
The proposed VTMD is made up of variable mass blocks and changeable commercial springs. A prototype of the VTMD was tested on a simply supported beam (3 m length) to investigate its characteristics in the Large-scale Structure Laboratory of National Chung Hsing University. Both of the Full-Scale building experimental results (one was the Full-scale RC school building floor, and the other was the Full-scale pre-cast RC waffle slab building) confirmed the effectiveness of the VTMD. The result of the floor test indicated a reduction in acceleration of more than 40 %. The result of the waffle slab test showed that a reduction in acceleration of 17-23 % can be achieved even though the mass ratio of VTMD to structure is very small.
The last part of this study, the numerical results from floors equipped with a VTMD in a high-tech fabrication factory in Central Taiwan Science Park, shows that the proposed VTMD can be used as an effective control device to reduce floor vibrations in high-tech fabrication factories.
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