NES对二维机翼气弹不稳定性的抑制作用

doi:10.7527/S1000-6893.2016.0013

Abstract

Abstract:

The flow-induced vibration of two-dimensional wing coupled with two nonlinear energy sinks (NESs) under freestream flow is studied by numerical methods, and the relationship between the vibration suppression and targeted energy transfer (TET) of the system is analyzed. The model of the coupling system, which takes into account both heave and pitch motions, is developed, and the NESs are located at the leading edge and the trailing edge (NES1 and NES2) separately. The mechanisms of vibration suppression by NESs are also investigated from the viewpoint of energy transfer, etc., and the resonance captures in the nonlinear coupling system are studied using spectrum analysis. The ensuing TET through the modes of wing (Heave and Pitch) and the NESs are discussed, and the relationship between TET and different limit cycle oscillations of wing are investigated as well. The results show that the NESs can broaden the frequency domain in which the TET and resonance captures between modes can be more available in the coupling system. Therefore, the TET is more efficient between the wing and NESs, thus leading to the increase of the critical velocity of freestream under which the vibration of wing can be suppressed by NESs effectively.

Key words: nonlinear energy sink, vibration suppression, targeted energy transfer, nonlinear vibration, resonance capture

CLC Number:

V211.47

ZHANG Wenfan, ZHANG Jiazhong, CAO Shengli. Suppression of aeroelastic instability of 2-D wing by nonlinear energy sinks[J]. ACTA AERONAUTICAET ASTRONAUTICA SINICA, 2016, 37(11): 3249-3262.

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Suppression of aeroelastic instability of 2-D wing by nonlinear energy sinks

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