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STUDY ON VIBRATION CONTROL FOR A DISCRETE MODEL OF AN OFFSHORE OIL PLATFORM

Ning Mei

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Abstract

This study investigates a discrete model of an offshore oil platform with tuned mass dampers (TMD) by using time-history analysis. The performance of a signal TMD and TMDs for different modes is studied. In design conditions (with mass ratio of 2%, significant wave frequency of 12, significant wave height of 10 m), the optimized TMD parameters to minimize the response to displacement of deck motion were obtained. The results show that the optimized TMD parameters results in reductions in response to all modal displacements. Of all methods to set TMDs, the effect of a signal TMD on the first modal mass is the best, and the less damping of TMD, the better effects of vibration control.

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What this paper is about

This study investigates a discrete model of an offshore oil platform with tuned mass dampers (TMD) by using time-history analysis. The performance of a signal TMD and TMDs for different modes is studied. In design conditions (with mass ratio of 2%, significant wave frequency of 12, significant wave height of 10 m), the optimized TMD parameters to minimize the response to displacement of deck motion were obtained. The results show that the optimized TMD parameters results in reductions in response to all modal displacements. Of all methods to set TMDs, the effect of a signal TMD on the first modal mass is the best, and the less damping of TMD, the better effects of vibration control.

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Available abstract

This study investigates a discrete model of an offshore oil platform with tuned mass dampers (TMD) by using time-history analysis. The performance of a signal TMD and TMDs for different modes is studied. In design conditions (with mass ratio of 2%, significant wave frequency of 12, significant wave height of 10 m), the optimized TMD parameters to minimize the response to displacement of deck motion were obtained. The results show that the optimized TMD parameters results in reductions in response to all modal displacements. Of all methods to set TMDs, the effect of a signal TMD on the first modal mass is the best, and the less damping of TMD, the better effects of vibration control.

Key concepts: Tuned mass damper, Deck, Vibration, Modal, Displacement (psychology), Structural engineering, Damping ratio, Modal analysis

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