柔性机翼遭遇阵风时非线性气动弹性响应的快速非稳态方法

IF 3.4 2区 工程技术 Q1 ENGINEERING, MECHANICAL
Oriol Chandre-Vila , Jean-Philippe Boin , Yann Nivet , Sylvie Marquier , Joseph Morlier , Nicolas Gourdain
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引用次数: 0

摘要

考虑到当前航空业为减少排放而进行的变革,有必要对计算方法进行现代化改造,以应对未来的情况,即现在单独计算的学科(即机动和阵风)应同时计算,包括柔性效应和使用时域方法。在这项工作中,对静态气动弹性公式进行了调整,以计算阵风载荷。这种静态方法使用空气动力矩阵计算结构变形的有效攻角(用于恢复局部压力系数)。为了使用与静态方法相同的计算方法,我们采用了包括非稳态影响在内的变形定义方法。在矩形机翼上测试了三种阵风情况(两种非稳态情况和一种准稳态情况),并将所提出的方法与航空弹性高保真解决方案和未修正版双晶格法(Nastran 解决方案 146)进行了比较。由于使用了查找表,拟议的解决方案能够准确估算出峰值升力系数值(最大误差为 6.7%),其速度至少是 Doublet Lattice 方法的 2.5 倍。尽管如此,由于使用了只有两个自由度的有限模型,建议的方法无法捕捉高度不稳定的阵风激励或气动不稳定性带来的复杂动态。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Fast unsteady method for non-linear aeroelastic responses of flexible aircraft wings encountering wind gusts

Given the current context of changes in aeronautics to reduce emissions, it is also necessary to modernise the computation methods to anticipate future cases where disciplines which are now calculated separately (i.e. manoeuvers and gusts) should be computed at the same time including flexible effects and using a time-domain approach. In this work, a static aeroelasticity formulation is adapted to compute wind gust loads. This static method uses aerodynamic matrices to calculate an effective angle of attack (used to recover the local pressure coefficients) from a structural deformation. The approach has been to define this deformation including unsteady effects influence in order to use the same formulation as the static case. Three gust cases (two unsteady and one quasi-steady) have been tested in a rectangular wing, and the proposed method has been compared to the aeroelastic high-fidelity solution and to an uncorrected version of the Doublet Lattice Method (Nastran Solution 146). The proposed solution benefits from the use of the lookup tables to accurately estimate the peak lift coefficient value (maximum error of 6.7%) at least 2.5 times faster than the Doublet Lattice Method. Nevertheless, using a limited model with only two degrees of freedom prevents the proposed method from capturing complex dynamics coming from highly unsteady gust excitation or from aerodynamic instabilities.

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来源期刊
Journal of Fluids and Structures
Journal of Fluids and Structures 工程技术-工程:机械
CiteScore
6.90
自引率
8.30%
发文量
173
审稿时长
65 days
期刊介绍: The Journal of Fluids and Structures serves as a focal point and a forum for the exchange of ideas, for the many kinds of specialists and practitioners concerned with fluid–structure interactions and the dynamics of systems related thereto, in any field. One of its aims is to foster the cross–fertilization of ideas, methods and techniques in the various disciplines involved. The journal publishes papers that present original and significant contributions on all aspects of the mechanical interactions between fluids and solids, regardless of scale.
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