桨叶弹性变形对旋翼噪声辐射特性的影响机理-2026增刊2

doi:10.7527/S1000-6893.2026.33924

Abstract

Abstract: Abstract:The rotor is the main noise source of helicopters, and its aeroelastic coupling characteristics critically affect the helicopter noise radiation. A high-efficiency and high-precision tightly coupled aeroelastic analysis model is developed based on the Geometrically Exact Beam Theory (GEBT) and the Viscous Vortex Particle Method (VVPM), and the Ffowcs Williams–Hawkings (FW-H) equation is introduced to establish the noise prediction model for investigating the influence mechanism of rotor aeroelastic coupling characteristics. The effectiveness of the proposed method is verified by comparing with the experimental data. The influence mechanism of rotor aeroelastic characteristics on noise amplitude and radiation characteristics is revealed by comparing the A-weighted sound pressure levels (SPL(dB(A))) on the observation plane below rigid and elastic rotors. Furthermore, combined with the frequency spectrum characteristics, the influence of aeroelastic coupling effects on the noise of the human ear-sensitive frequency band (1–5 kHz) is emphatically analyzed, revealing the impact of elastic deformation on the subjectively perceived rotor noise, which provides theoretical support for the engineering application of helicopter noise reduction.

Key words: Keywords: Rotor, Viscous vortex particle method, Geometrically exact beam theory, FW-H equation, Aeroelastic coupling, Noise frequency spectrum

CLC Number:

V215.34

Wang Xin Li-Xiong ZHENG Xiayang Zhang. Influence mechanism of blade elastic deformation on rotor noise radiation characteristics[J]. Acta Aeronautica et Astronautica Sinica, doi: 10.7527/S1000-6893.2026.33924.

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Influence mechanism of blade elastic deformation on rotor noise radiation characteristics

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