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Output-based flutter bifurcation forecasting in nonlinear fluid-structural systems with multiple varying parameters
Journal of Fluids and Structures ( IF 3.6 ) Pub Date : 2021-01-21 , DOI: 10.1016/j.jfluidstructs.2020.103201
Cristina Riso , Carlos E.S. Cesnik , Bogdan I. Epureanu

High-performance flutter and post-flutter predictions are critical in the design of a vast range of nonlinear fluid-structural systems. However, these predictions are often unfeasible due to their high computational cost. Moreover, traditional methods for flutter and post-flutter predictions are model intrusive and limited to one varying parameter at a time. To address these shortcomings, this paper introduces a novel output-based method for forecasting flutter bifurcations and post-flutter dynamics in nonlinear fluid-structural systems with multiple varying parameters. The proposed method uses only output data from a handful of transient responses in the pre-flutter regime to predict the flutter boundary and a range of the bifurcation diagram. The method is demonstrated in analytical systems where the predicted bifurcation diagrams match the exact solutions. Next, the method is applied to a geometrically nonlinear wing considering variations in the flow speed and torsion stiffness. The predicted bifurcation diagrams closely agree with time-marching solutions despite the proposed method requires only a handful of transient calculations. These results show that the proposed method enables computationally efficient and accurate output-based flutter bifurcation forecasting in nonlinear fluid-structural systems with multiple varying parameters.



中文翻译:

非线性流体结构系统中基于输出的颤振分叉预测

高性能颤振和颤振后预测对于设计各种非线性流体结构系统至关重要。然而,由于它们的高计算成本,这些预测通常是不可行的。此外,用于颤振和颤振后预测的传统方法是模型侵入式的,并且一次只能限制一个变化的参数。为了解决这些缺点,本文介绍了一种基于输出的新颖方法,用于预测具有多个可变参数的非线性流体结构系统中的颤振分叉和颤振后动力学。所提出的方法仅使用来自预颤动状态中少数瞬态响应的输出数据来预测颤动边界和分叉图的范围。该方法在预测分叉图与精确解匹配的分析系统中得到了证明。接下来,将该方法应用于考虑流动速度和扭转刚度变化的几何非线性机翼。尽管所提出的方法只需要少量的瞬态计算,但是预测的分叉图与时间步长解非常吻合。这些结果表明,所提出的方法能够在具有多个变化参数的非线性流体结构系统中实现计算有效且准确的基于输出的颤动分叉预测。尽管所提出的方法只需要少量的瞬态计算,但是预测的分叉图与时间步长解非常吻合。这些结果表明,所提出的方法能够在具有多个变化参数的非线性流体结构系统中实现计算有效且准确的基于输出的颤动分叉预测。尽管所提出的方法只需要少量的瞬态计算,但是预测的分叉图与时间步长解非常吻合。这些结果表明,所提出的方法能够在具有多个变化参数的非线性流体结构系统中实现计算有效且准确的基于输出的颤动分叉预测。

更新日期:2021-01-22
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