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静气动弹性研究中关于结构的分析通常采用柔度法和模态法。相比技术成熟、计算量大的柔度法,模态法具有阶次低、求解快和便于试验验证的优点。但其作为近似的分析方法,在工程应用中需要一定的经验,尚缺乏模态选取的准则,该研究的目的是为模态法的工程应用提供模态选取的定量评价标准。针对某典型飞行器进行升降舵效率、副翼效率及气动导数弹性修正等分析,提出模态影响系数的概念来评估模态的选取对这些气动弹性分析的影响。结果表明,模态影响系数指标合理,能够反映模态选取对静气动弹性特性的影响,可以作为模态法中模态选取的定量评价指标。
In static aeroelastic studies, the structural analysis usually adopts the method of flexibility and modal. Compared with the mature technology and the large amount of calculation, the modal method has the advantages of low order, quick solution and convenient experimental verification. However, as an approximate analysis method, it requires some experience in engineering application. However, the criterion of modal selection is still lacking. The purpose of this study is to provide quantitative evaluation criteria for modal selection for engineering application of modal methods. Aiming at the analysis of some typical aircraft such as elevator efficiency, aileron efficiency and elastic correction of aeroelastic derivatives, the concept of modal influence coefficient is proposed to evaluate the effect of modal selection on these aeroelastic analysis. The results show that the index of modal influence coefficient is reasonable and can reflect the influence of modal selection on the static aerodynamic characteristics, which can be used as the quantitative evaluation index of modal selection in modal method.