Reducing Tonal Noise of Contra-Rotating Unmanned Aerial System Rotors via Blade Rake Angle Adjustment

IF 1.8 4区物理与天体物理

Acoustics Australia Pub Date : 2025-05-31 DOI:10.1007/s40857-025-00352-4

Riul Jung, Carlos Ramos-Romero, Michael J. Kingan, Deepak Akiwate, Antonio J. Torija

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引用次数: 0

Abstract

This paper investigates the effect of blade rake angle on the tonal noise produced by contra-rotating rotor systems suitable for use on small multi-rotor unmanned aerial systems (UAS). This investigation utilises semi-analytical, numerical, and experimental methods to investigate the physics of the noise generation mechanisms, generated noise levels and the psychoacoustic characteristics of this noise. Computational fluid dynamics (CFD) simulations and semi-analytical models are employed to predict the periodic unsteady loading on the rotor blades, and the loading data are used to predict the radiated noise for rotor systems with different blade rake angles. Experimental measurements of the noise produced by a rotor system with no blade rake angle were used as a baseline case, and predictions were used to synthesise and auralise the sound produced by rotor systems with different rake angles for psychoacoustic analysis. The results show that increasing the blade rake angle generally reduces the amplitude of prominent interaction tones due to the reduction in the unsteady loading along the blade span caused by bound potential field interactions as the blade rake angle increases. This causes a reduction in the perceived tonal noise level.

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通过调整叶片前倾角降低对转无人机系统旋翼的噪声

本文研究了适用于小型多旋翼无人机系统（UAS）的对转旋翼系统，叶片前倾角对其噪声的影响。本研究利用半解析、数值和实验方法来研究噪声产生机制的物理学、产生的噪声水平和这种噪声的心理声学特征。采用计算流体力学（CFD）模拟和半解析模型预测了转子叶片的周期性非定常载荷，并利用载荷数据预测了不同叶片前倾角转子系统的辐射噪声。实验测量了无叶片前倾角转子系统产生的噪声，并以预测结果为基础，对不同前倾角转子系统产生的噪声进行了合成和听觉化，用于心理声学分析。结果表明：随着前倾角的增大，束缚势场相互作用引起的沿叶跨的非定常载荷减小，增大叶片前倾角总体上减小了突出相互作用音调的幅值；这会导致感知到的音调噪声水平的降低。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Acoustics Australia ACOUSTICS-

自引率

5.90%

发文量

期刊介绍： Acoustics Australia, the journal of the Australian Acoustical Society, has been publishing high quality research and technical papers in all areas of acoustics since commencement in 1972. The target audience for the journal includes both researchers and practitioners. It aims to publish papers and technical notes that are relevant to current acoustics and of interest to members of the Society. These include but are not limited to: Architectural and Building Acoustics, Environmental Noise, Underwater Acoustics, Engineering Noise and Vibration Control, Occupational Noise Management, Hearing, Musical Acoustics.