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ACTA AERONAUTICAET ASTRONAUTICA SINICA ›› 2017, Vol. 38 ›› Issue (7): 120873-120873.doi: 10.7527/S1000-6893.2017.120873

• Fluid Mechanics and Flight Mechanics • Previous Articles     Next Articles

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

WANG Xiansheng1,2, YANG Dangguo1,2, LIU Jun1,2, SHI Ao2, ZHOU Fangqi2, LYU Binbin2   

  1. 1. State Key Laboratory of Aerodynamics, China Aerodynamics Research and Development Center, Mianyang 621000, China;
    2. High Speed Aerodynamics Institute, China Aerodynamics Research and Development Center, Mianyang 621000, China
  • Received:2016-10-20 Revised:2016-11-04 Online:2017-07-15 Published:2017-02-13
  • Supported by:

    National Natural Science Foundation of China (11602287,11402286)

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: