首页 >

模态选取对基于模态法的气动弹性分析影响的研究

杜子亮1,万志强2,杨超1   

  1. 1. 北京航空航天大学
    2. 北京航空航天大学航空科学与工程学院
  • 收稿日期:2014-07-18 修回日期:2014-09-25 发布日期:2014-09-29
  • 通讯作者: 杨超
  • 基金资助:
    近空间高超声速飞行器多源信息融合高精度容错自主导航技术

The Effect of Modal Selection on Modal Approach of Aeroelastic Analysis

1, 1,Yang Chao   

  • Received:2014-07-18 Revised:2014-09-25 Published:2014-09-29
  • Contact: Yang Chao

摘要: 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,研究旨在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、副翼效率等弹性修正分析,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,并对结果加以解释。结果表明,模态影响系数指标合理,能够反映模态选取对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。

关键词: 气动弹性, 模态法, 模态影响系数, 弹性修正, 操纵面, 控制效率

Abstract: The flexibility method and modal approach are usually used in structural analysis in the aeroelastic research. Compared to the flexibility method which is mature but brings higher computational cost for the solution,the modal approach has the advantage of significant reduction in the dimension of the problem,high efficiency and convenient for verification. However, there are no principles for the selection of modes and one must have enough engineering experience to fully utilize the modal approach in practice. To provide modal approach with its own quantitative criteria in practice, this paper first proposes the idea of modal influence coefficient to evaluate the effect of modal selection on modal approach of aeroelastic analysis. In order to validate the rationality and validity of the modal influence coefficient, the paper carrys out control efficiency and aeroelastic correction analysis for a typical aircraft. The results show that the modal influence coefficient can accurately evaluate the effect of modal selection on aeroelastic analysis, thus providing some helpful reference in practice.

Key words: aeroelasticity, modal approach, modal influence coefficient, aeroelastic correction, control surfaces, control efficiency