基于功能原理的颤振模态参与度分析方法

doi:10.7527/S1000-6893.2020.24920

Abstract

Abstract: 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.

Key words: flutter, aeroelasticity, principle of work and power, mode indicator, frequency drift

CLC Number:

V211.47

WANG Xinjiang, LIU Ziqiang, GUO Li, FU Zhichao, LYU Jinan. Analysis method for flutter mode indicator based on principle of work and power[J]. ACTA AERONAUTICAET ASTRONAUTICA SINICA, 2022, 43(1): 224920.

References

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

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