战斗机进气道结构声疲劳设计方法

doi:10.7527/S1000-6893.2023.29603

Abstract

Abstract:

The thin-walled structure of an advanced fighter inlet experiences severe vibration and noise loads due to the internal flow field separation in the S-shaped inlet， resulting in limited fatigue life of the inlet skin and supporting structure and thus increased maintenance cost. Therefore， the S-shaped inlet design against acoustic fatigue is a key challenge in the structural design of next-generation fighters. This study establishes a design method to combat inlet acoustic fatigue based on an analysis of the aerodynamic noise prediction method， the acoustic-vibration coupling analysis method， the fast finite element inlet modeling method， and acoustic fatigue life prediction. The proposed method is verified by experiments， with results demonstrating good agreement with the analysis results， and provides an effective technical means for the dynamics strength design of fighter inlet structures.

Key words: S-shaped inlet, acoustic fatigue, aerodynamic noise prediction, acoustic-vibration coupling, life prediction

CLC Number:

Binjie MOU, Jinsong JIANG, Kun YANG, Huanbing FU, Dehong MENG, Wei JIN. Acoustic fatigue design method for fighter inlet structure[J]. Acta Aeronautica et Astronautica Sinica, 2024, 45(14): 229603-229603.

Figures/Tables 22

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Ma	测点总声压级/dB
Ma	CFD	风洞试验	误差
0.85	152.3	150.4	1.9
1.15	154.3	151.8	2.5
1.5	153.1	151.0	2.1

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Acoustic fatigue design method for fighter inlet structure

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