Investigation on Coupling Physical Mechanism between Acoustic and Structural Vibration of Elastic Cavities at Supersonic Speed

7th Annual International Conference on Materials Science and Engineering

Yang, Ye^1^2 ; Yang, Dangguo^1^2 ; Wang, Xiangshen^1^2 ; Zhou, Fangqi^1^2

High Speed Aerodynamics Research Institute, China Aerodynamics Research and Development Center, Mianyang

621000, China^1

State Key Laboratory of Aerodynamics, Mianyang

621000, China^2

关键词: Cavity structure;    Coupling characteristic;    Elastic cavities;    Peak frequencies;    Physical mechanism;    Structural response;    Structural vibrations;    Vibration characteristics;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/562/1/012042/pdf
DOI  :  10.1088/1757-899X/562/1/012042

来源: IOP

【 摘 要 】

The coupling of cavity noise and the structural vibration caused by the flow around the cavity at high speed will adversely affect the structure of the aircraft and threaten flight safety. Through the synchronous test method of noise and structural response, the test of acoustic/vibration coupling characteristics of the elastic cavity at supersonic condition in a wind tunnel was carried out, and the elastic cavity noise, structural vibration response characteristics and the coupling law were studied. The results show that the intracavity noise load mainly affects the low-order modal response of the cavity structure. Compared with the rigid cavity, the maximum position of the intracavity noise affected by the radiated sound wave is near the elastic boundary with strong vibration characteristics, and the noise peak frequency component is particularly affected.