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首页> 美国政府科技报告 >The NLR/National Gas Turbine Establishment (Ngte) Joint Program on the Measurement of Attenuation and Impedance in Acoustic Flow Duct Facilities
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The NLR/National Gas Turbine Establishment (Ngte) Joint Program on the Measurement of Attenuation and Impedance in Acoustic Flow Duct Facilities

机译：NLR /国家燃气轮机公司（Ngte）关于声流管道设施中衰减和阻抗测量的联合计划

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Acoustic measurement methods based on (A) inferring impedance information from insertion loss data and (B) direct measurement of impedance by the two microphone method, using pure tone excitation, are compared Method A finds impedance values that best predict the measured insertion loss spectra, using multimodal theory of sound propagation in the duct by trial and error. In (B) insertion loss is computed from measured impedance. Tests on liner panels show that the derivation of inferred impedance from attenuation measurements is coarse, through capable of generating design rules. Direct impedance measurements must include the effects of high intensity broadband sound, flow, boundary layers, and nonuniformities over the area of duct linings.

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