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首页> 外文会议>Scantek, Inc.;National conference on noise control engineering;Institute of Noise Control Engineering of the USA >Modeling of adaptively tunable flow driven resonators for axial fan blade tone noise attenuation
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Modeling of adaptively tunable flow driven resonators for axial fan blade tone noise attenuation

机译：自适应可调流驱动谐振器的模型，用于轴流风扇叶片音噪声的衰减

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摘要

The goal of this study is to integrate tunable, flow-excited, quarter-wavelength resonators into the shroud of ducted subsonic axial fans to explore their effectiveness in attenuating axial fan blade tones. Resonators oriented such that they are driven by blade-tip flow from a rotor can be positioned to generate an anti-phase secondary sound field to reduce radiated propagations of blade tone noise by more than 25 dB to within 5 dB of the broadband noise level with negligible effects on efficiency of the fan. Using knowledge of an existing fan’s noise radiation characteristics and acoustic shroud pressure, it is possible to analytically model a configuration of resonators capable of obtaining maximal reductions of blade tone noise. A flow driven resonator’s response parameters are acquired experimentally under flow free conditions and driving pressure measurements are taken directly through the fan’s shroud using a series of probe microphones. Prediction of an individual resonator’s flow driven response is accomplished using transmission line theory to propagate the driving end pressure to the flow driven response. Each resonator’s response can be modeled as a monopole introduced into the overall sound field at each resonator’s respective mouth opening. Individual sources can be superimposed to model the entirety of secondary sound field. Source parameters can then be tailored analytically to appropriately cancel the primary field of radiated blade tone noise of specific radiated modes.
机译：这项研究的目的是将可调谐的，可激发流量的四分之一波长谐振器集成到导管式亚音速轴流风扇罩中，以探索其在减弱轴流风扇叶片音调方面的有效性。可以定位共振器，使其由来自转子的叶尖流动驱动，以产生反相的次级声场，从而将叶片音调噪声的辐射传播降低25 dB以上，至宽带噪声水平的5 dB以内。对风扇效率的影响可以忽略不计。利用现有风扇的噪声辐射特性和隔音罩压力的知识，可以对能够获得最大程度降低叶片音调噪声的谐振器的配置进行分析建模。在无流动条件下，通过实验获得了流动驱动谐振器的响应参数，并使用一系列探管麦克风直接通过风扇的导流罩来测量驱动压力。使用传输线理论将驱动端压力传播到流量驱动的响应，可以预测单个谐振器的流量驱动的响应。每个谐振器的响应都可以建模为在每个谐振器各自的开口处引入整个声场的单极子。可以叠加各个声源来模拟整个次级声场。然后可以分析性地调整源参数，以适当消除特定辐射模式的辐射叶片音调噪声的主场。

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