弹性空腔流致噪声/结构振动特性试验

doi:10.7527/S1000-6893.2017.120873

Abstract

Abstract:

Coupling between aeroacoustic noise loads and structural vibration in cavity flow-induced oscillation may bring about severe damage to aircraft, especially when structural resonance occurs. To study the coupling mechanism, elastic cavity tests are performed in a high-speed wind tunnel with 0.6 m×0.6 m cross-section. The natural frequency of the elastic cavity structure can be adjusted by changing the thickness of its floor. Noise and vibration transducers are employed in the tests to obtain acoustic noise loads and structural vibrations. The Mach number ranges from 0.6 to 1.2. It is shown that under the current conditions, structural vibration has little effect on cavity noise, while cavity noise has an important influence on structural vibration. At the main frequency position of cavity noise, power spectral density of structural vibration peaks and correlation of noise/vibration are the strongest. In addition, structural vibration is also closely related to the natural frequency of the cavity, and vibration is dominated by the low-order mode.

Key words: elastic cavity, flow-induced noise, aeroacoustics, structural vibration, wind tunnel test

CLC Number:

V211.7

WANG Xiansheng, YANG Dangguo, LIU Jun, SHI Ao, ZHOU Fangqi, LYU Binbin. Test on interactions between aeroacoustic noise and structural vibration in elastic cavity flow[J]. ACTA AERONAUTICAET ASTRONAUTICA SINICA, 2017, 38(7): 120873-120873.

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Test on interactions between aeroacoustic noise and structural vibration in elastic cavity flow

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