On the uncertainty of aerodynamic derivatives obtained using forced vibration tests in active grid generated turbulent flow

IF 4.2 2区工程技术 Q1 ENGINEERING, CIVIL

Journal of Wind Engineering and Industrial Aerodynamics Pub Date : 2025-02-01 DOI:10.1016/j.jweia.2025.106005

Oddbjørn Kildal, Øyvind Wiig Petersen, Ole Øiseth

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Abstract

The present study investigates the effect of turbulence on aerodynamic derivatives (ADs) and the uncertainty of AD estimates due to buffeting forces. Wind tunnel experiments were conducted, using forced vibration testing to analyze changes in estimated ADs with increasing turbulence intensity. The experimental results revealed a significant scatter in the AD estimates, indicating the stochastic influence of buffeting forces on the estimation of ADs. Monte Carlo (MC) simulations were performed to further investigate this phenomenon. The MC simulations demonstrated that larger buffeting forces lead to larger uncertainty in estimated ADs, and highlighted the challenge of accurate estimation in the presence of turbulent flow. Despite challenges with the system identification, the study indicated that changes in aerodynamic damping due to turbulence are likely. In addition, closed-form analytical expressions for uncertainty estimation in ADs due to noise yielded uncertainty estimates that corresponded well with the experiments and the MC simulations. It was shown that the uncertainty of estimated ADs in turbulent flow can be decreased by increasing measurement duration and increasing the forced motion amplitude.

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主动网格湍流中强迫振动试验气动导数的不确定性研究

本文研究了湍流对气动导数（ADs）的影响以及颤振力对AD估计的不确定性。进行风洞试验，采用强迫振动试验，分析估计ADs随湍流强度增加的变化。实验结果显示，AD估计存在显著的散点，表明抖振力对AD估计的随机影响。为了进一步研究这一现象，我们进行了蒙特卡罗（MC）模拟。MC模拟表明，较大的抖振力导致估计ADs的不确定性较大，并突出了在湍流存在下准确估计ADs的挑战。尽管在系统识别方面存在挑战，但研究表明，由于湍流的影响，气动阻尼可能会发生变化。此外，对ADs中受噪声影响的不确定性估计的封闭式解析表达式得到的不确定性估计与实验和MC模拟很好地对应。结果表明，增加测量时间和增大强迫运动幅值可以降低湍流中ADs的不确定度。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Journal of Wind Engineering and Industrial Aerodynamics 工程技术-工程：土木

CiteScore

8.90

自引率

22.90%

发文量

306

审稿时长

4.4 months

期刊介绍： The objective of the journal is to provide a means for the publication and interchange of information, on an international basis, on all those aspects of wind engineering that are included in the activities of the International Association for Wind Engineering http://www.iawe.org/. These are: social and economic impact of wind effects; wind characteristics and structure, local wind environments, wind loads and structural response, diffusion, pollutant dispersion and matter transport, wind effects on building heat loss and ventilation, wind effects on transport systems, aerodynamic aspects of wind energy generation, and codification of wind effects. Papers on these subjects describing full-scale measurements, wind-tunnel simulation studies, computational or theoretical methods are published, as well as papers dealing with the development of techniques and apparatus for wind engineering experiments.