| Budget Amount *help |
¥5,460,000 (Direct Cost: ¥4,200,000、Indirect Cost: ¥1,260,000)
Fiscal Year 2014: ¥2,340,000 (Direct Cost: ¥1,800,000、Indirect Cost: ¥540,000)
Fiscal Year 2013: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Fiscal Year 2012: ¥1,690,000 (Direct Cost: ¥1,300,000、Indirect Cost: ¥390,000)
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| Outline of Final Research Achievements |
This study deals with a flutter analysis of a rectangular flexible sheet subjected to axial fluid flow. The unsteady fluid force acting on the sheet surface is calculated by using Doublet-point method, which is based on the unsteady lifting surface theory. The equation of motion of the sheet coupled with the fluid flow is derived by employing finite element method. Flutter velocity and frequency are measured in experiment. Flutter characteristic is clarified by comparing the analysis with the experimental results. The local work by fluid force on the sheet surface, and instability mechanism are clarified. Moreover, an active feedback control to suppress the sheet flutter is proposed. The sheet flutter is actively controlled and suppressed the movable plates change the fluid flow around the sheet. It is theoretically and experimentally indicated that the flow induced sheet flutter is suppressed by the proposed active control.
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