524 ジャイロ制振装置による橋桁の連成フラッタの制御 : 装置の非線形特性を考慮した設計手法

概要

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This paper deals with the effect of a gyroscopic damper (GD) on bridge deck flutter considering nonlinear characteristics of the gyroscopic moment of the GD. The GD has been reported to have a major effect in suppressing bridge deck flutter through a linear analysis in which the GD motion is assumed to be sufficiently small. However, since the GD produces a large oscillation against the slight amplitude of deck torsional motion, the control effect of GD actually decreases on deck torsional motion as the GD amplitude increases. In this paper, applying the method of equivalent linearization, we proposed the index parameters that indicate the effect of the GD with large oscillation. The validity of these parameters was confirmed by the nonlinear time response analysis of a 2-d bridge deck model with the GD which self-excited aerodynamic forces and gusty wind forces act on.
2002-09-13