Modeling physical uncertainties in dynamic stall induced fluid–structure interaction of turbine blades using arbitrary polynomial chaos

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• 作者：Jeroen A.S. Witteveen ; Sunetra Sarkar ; Hester Bijl
• 关键词：Dynamic stall ; Stall flutter ; Structural nonlinearity ; Uncertainty quantification ; Polynomial chaos expansion ; Arbitrary uncertainties
• 刊名：Computers and Structures
• 出版年：2007
• 出版时间：June-July 2007
• 年：2007
• 卷：85
• 期：11-14
• 页码：866-878
• 全文大小：1049 K

文摘

A nonlinear dynamic problem of stall induced flutter oscillation subject to physical uncertainties is analyzed using arbitrary polynomial chaos. A single-degree-of-freedom stall flutter model with torsional oscillation is considered subject to nonlinear aerodynamic loads in the dynamic stall regime and nonlinear structural stiffness. The analysis of the deterministic aeroelastic response demonstrated that the problem is sensitive to variations in structural natural frequency and structural nonlinearity. The effect of uncertainties in these parameters is studied. Arbitrary polynomial chaos is employed in which appropriate expansion polynomials are constructed based on the statistical moments of the uncertain input. The arbitrary polynomial chaos results are compared with Monte Carlo simulations.