NDLI: Vibration Suppression of a 90m-tall Steel Stack by Using a High-damping Tuned Mass Damper

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Vibration Suppression of a 90m-tall Steel Stack by Using a High-damping Tuned Mass Damper

Content Provider	Semantic Scholar
Author	Areemit, Natthapong Warnitchai, Pennung
Copyright Year	2001
Abstract	This paper presents an application of a pendulum tuned mass damper to suppress wind-induced oscillation of a 90-m-tall steel stack in Rayong, Thailand. During the design phase, an analysis of wind-induced response of the stack was carried out, and it was found that unacceptably large sway motions of the stack could be developed even at low wind speeds due to vortex resonance. It was also found that the sway motions could be effectively suppressed by introducing sufficiently high additional damping to the stack. A pendulum Tuned Mass Damper (TMD) was then chosen as a vibration control device to be installed at the top of the stack. It consists of a 3600-kg steel ring, three suspended wire ropes, and three viscous dampers. The damping ratio of TMD was intentionally set to a value much higher than the optimal one; this was to keep the relative motion between TMD and the stack within an acceptable limit and to make the performance of TMD less sensitive to the error in frequency tuning. Performance tests of the pendulum TMD were conducted before and after the installation to the stack. The tests before the installation indicated that the natural frequency of TMD varied significantly with the vibration level. This was caused by the change in effective pendulum arm length, and the mechanism was carefully investigated in details. The tests also revealed a viscoelastic effect of the dampers; the dampers not only added damping to the pendulum system but also shortened the natural period of the system. Despite the variation of natural frequency and the viscoelastic effect, the tests after the installation showed clearly that sufficiently high damping was added into the stack system.
File Format	PDF HTM / HTML
Alternate Webpage(s)	http://www.gerb.com/en/bibliothek/downloads/dokumente/MeasuringReportStackThailand.pdf
Language	English
Access Restriction	Open
Content Type	Text
Resource Type	Article

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