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

机译:使用任意多项式混沌建模动态失速引起的涡轮叶片流固耦合的物理不确定性

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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.
机译:利用任意多项式混沌分析了失速引起的颤振振荡的非线性动力学问题,其物理不确定性。带有扭振的单自由度失速颤振模型被认为在动态失速状态和非线性结构刚度下要承受非线性气动载荷。对确定性气动弹性响应的分析表明,该问题对结构固有频率和结构非线性的变化敏感。研究了这些参数中不确定性的影响。采用任意多项式混沌,其中基于不确定输入的统计矩构造适当的展开多项式。将任意多项式混沌结果与蒙特卡洛模拟进行比较。

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