Abstract The past decade has witnessed a renewed interest in studying the fundamentals of galloping due to the emergence of new engineering applications were this aeroelastic instability is intentionally activated and utilized. One interesting problem deals with the development of analytical models to predict the dependence of the galloping instability on the parameters of the flow and the geometry of the galloping body. In this regard, most of the mathematical models used to predict the onset of galloping rely on experimental identification techniques to characterize the aeroelastic forces at play. One common approach adopts the quasi-steady flow theory and identifies the aerodynamic forces by using static wind-tunnel measurements in which the bluff body is rotated relative to the flow direction and the forces are measured at different angles of attack. This approach necessitates collecting a large number of data points at different angles of attack to characterize the aeroelastic forces acting on a single bluff body. To alleviate this problem, this paper proposes a new approach, which utilizes measurements of the time history of the bluff body oscillations combined with a balance of the interacting energy fields to estimate the normal force coefficient in galloping oscillators. A key advantage of the proposed method lies in its ability to rapidly and accurately predict the normal force curves using a single set of time history data and without the need to use complex and sometimes not very sensitive force measurements. The method is verified experimentally and used to effectively predict the normal force curves for a set of bluff geometries.

中文翻译：

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横向飞驰法向力曲线的有效表征

摘要 在过去的十年里，由于新的工程应用的出现，人们对研究驰骋的基本原理重新产生了兴趣，因为有意激活和利用了这种气动弹性不稳定性。一个有趣的问题涉及分析模型的发展，以预测飞驰不稳定性对流动参数和飞驰体几何形状的依赖性。在这方面，大多数用于预测疾驰开始的数学模型都依赖于实验识别技术来表征起作用的气动弹性力。一种常见的方法采用准稳态流动理论，并通过使用静态风洞测量来识别空气动力，其中钝体相对于流动方向旋转，并在不同的攻角下测量力。这种方法需要在不同的攻角下收集大量数据点，以表征作用在单个钝体上的气动弹性力。为了缓解这个问题，本文提出了一种新方法，该方法利用对钝体振荡的时间历程的测量结合相互作用的能量场的平衡来估计飞驰振荡器中的法向力系数。所提出方法的一个关键优势在于它能够使用一组时间历史数据快速准确地预测法向力曲线，而无需使用复杂且有时不是非常敏感的力测量。该方法经过实验验证并用于有效预测一组钝体几何形状的法向力曲线。