柔軟ウェブ基礎形態のフラッタ限界とその挙動に関する研究 : 第 1 報フラッタ限界の予測と風洞試験結果(流体工学, 流体機械)

概要

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Fluttering conditions are analyzed for webs with a simplified basic configuration with both leading and trailing edges fixed in a uniform flow by the method proposed in a previous study by one of the authors. The predicted flutter limits are expressed in terms of a ratio of fluid force to tension (σ^*) and a ratio of tension to bending stiffness (τ^*). Three regions for τ^* are seen to form characteristic zones of behavior. For τ^* greater than 1×(10)^3 and less than 1×(10)^6,σ^* and reduced frequency are of nearly constant values, respectively. For τ^* less than 1×(10)^3,effect of bending stiffness appears and divergence-like instabilities having lower frequencies occur before the flutter. For τ^* greater than 1×(10)^6,σ^* tends to become drastically lower and the reduced frequency becomes higher, with oscillation modes changing into higher order ones. Experimental flutter limits obtained in the wind tunnel, though scattered much, are seen on the average to conform to the expected ones in the limited range of τ^* of 1×(10)^3-4×(10)^4.
社団法人日本機械学会の論文
2001-11-25