自动消除风扇噪音

IF 1.2 4区工程技术 Q3 ACOUSTICS

International Journal of Aeroacoustics Pub Date : 2022-06-10 DOI:10.1177/1475472X221107543

C. Fuller

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引用次数: 1

摘要

风扇噪声的降低是无人机和无人机成功部署的一个重要问题。本文提出了一种利用螺旋桨叶片在支撑轴周围的微振动来降低风扇和螺旋桨噪声的新方法。对一种五叶扇布置进行了实验测试。微风扇叶片振动是由电磁致动器驱动的螺距连杆致动器装置引起的。当与数字前馈主动噪声控制器结合使用时，发现微叶片振动可以提供风扇辐射声音的全局衰减，其量级为前几个风扇音调的5到10dB。与风扇电机功率要求相比，消除微振动所需的振动水平和相关电力要求非常小。结果表明，这种被称为“风扇噪声自主动消除”的创新方法在降低风扇和螺旋桨噪声方面具有良好的潜力。

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Self active cancellation of fan noise

Reduction of fan noise is an important problem in the successful deployment of drones and UAV's. This paper considers a new approach to reducing fan and propeller noise based upon micro vibrations of the propeller blades around their axis of support. Experimental testing was carried out on a five bladed fan arrangement. The micro fan blade vibrations are induced with a pitch link actuator arrangement driven by an electromagnetic actuator. When used in conjunction with a digital feedforward active noise controller, the micro blade vibrations were found to provide global attenuations of fan radiated sound the order of 5 to 10dB of the first few fan tones. The level of required vibrations and the associated electrical power required for the cancelling micro vibrations was shown to be very small compared to the fan motor power requirements. The results demonstrate that the innovative approach, termed “self active cancellation of fan noise”, has good potential for global reduction of fan and propeller noise.

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来源期刊

International Journal of Aeroacoustics ACOUSTICS-ENGINEERING, AEROSPACE

CiteScore

2.10

自引率

10.00%

发文量

审稿时长

>12 weeks

期刊介绍： International Journal of Aeroacoustics is a peer-reviewed journal publishing developments in all areas of fundamental and applied aeroacoustics. Fundamental topics include advances in understanding aeroacoustics phenomena; applied topics include all aspects of civil and military aircraft, automobile and high speed train aeroacoustics, and the impact of acoustics on structures. As well as original contributions, state of the art reviews and surveys will be published. Subtopics include, among others, jet mixing noise; screech tones; broadband shock associated noise and methods for suppression; the near-ground acoustic environment of Short Take-Off and Vertical Landing (STOVL) aircraft; weapons bay aeroacoustics, cavity acoustics, closed-loop feedback control of aeroacoustic phenomena; computational aeroacoustics including high fidelity numerical simulations, and analytical acoustics.