Analysis method for flutter mode indicator based on principle of work and power

被引：0
|
作者：
Wang X. [1 ]
Liu Z. [1 ]
Guo L. [1 ]
Fu Z. [1 ]
Lyu J. [2 ]
机构：
[1] China Academy of Aerospace Aerodynamics, Beijing
[2] China Academy of Launch Vehicle Technology, Beijing
来源：
Hangkong Xuebao/Acta Aeronautica et Astronautica Sinica | 2022年 / 43卷 / 01期
关键词：
Aeroelasticity; Flutter; Frequency drift; Mode indicator; Principle of work and power;
D O I：
10.7527/S1000-6893.2020.24920
中图分类号：
学科分类号：
摘要：
Flutter boundaries and flutter coupling mechanisms are of high significance for aircraft design and flutter tests. The flutter boundary is determined by the distinguishing characteristic of the generalized coordinate of modes, which often depends on the experience of designers and therefore it is difficult to guarantee the quantitative uniformity of discriminant standards. This paper proposes a new method for the flutter mode indicator analysis based on the principle of work and power. The analysis is realized through energy accumulation of generalized force work on modal coordinates. Rational function approximation and the CFD/CSD method are used respectively in the AGARD445.6 flutter mode indicator analysis to verify the proposed method. Then, the 'frequency drifting' phenomenon of twin-fuselage aircraft is explained logically by the proposed method, highlighting the advantage of the proposed method. The results show that the proposed method well reflects the flutter coupling mechanism, exhibiting characteristics of reliable flutter modes indexes, clear physical meaning and strong results normalization. © 2022, Beihang University Aerospace Knowledge Press. All right reserved.
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