A method for predicting aircraft noise and vibration environment based on acoustic and vibration transmission

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Journal of Vibration and Shock ›› 2024, Vol. 43 ›› Issue (1) : 290-296.

LI Bingwei1, ZHU Hongmin1, LIU Shixiu2, CHEN Gang3

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Abstract

High-speed aircraft undergoes noise and vibration environment during the flight mission, and the environment is severe, complex, and difficult to predict. Therefore, a noise and vibration environment prediction method based on sound and vibration transmission is proposed. Firstly, the extravehicular fluctuating pressure field of aircraft under typical flying conditions is obtained by means of numerical simulation, fluctuating pressure wind tunnel test or engineering analysis. Secondly, through noise test or sound-vibration coupling simulation analysis, the sound-vibration transmission characteristics of aircraft are obtained. Finally, according to the obtained extravehicular pulsating pressure and sound and vibration energy transfer characteristics, combined with the specific flight parameters, the aircraft noise and vibration environment under the actual flight conditions is predicted. The method proposed in this paper is used to study the vibration environment prediction of an aircraft. It is verified by ground and flight tests that the prediction accuracy of vibration environment can reach 1.6dB. The prediction method of flight sound and vibration environment based on sound and vibration transmission proposed in this paper can be widely used in the fine environment design of missiles, rockets and other aircraft. It has important engineering significance for improving the overall performance, environmental adaptability and flight reliability of aircraft.

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LI Bingwei1, ZHU Hongmin1, LIU Shixiu2, CHEN Gang3. A method for predicting aircraft noise and vibration environment based on acoustic and vibration transmission[J]. Journal of Vibration and Shock, 2024, 43(1): 290-296

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