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- W2078358054 abstract "This paper considers the effective impedance that pertains as low frequency sound in a plain pipe radiates into a general perforated pipe of equal diameter. A previous theory that considered only the reactance is extended to also include resistance. Experimental measurements are made of the response of a Helmholtz resonator to an external sound field, where the neck of the Helmholtz resonator has both plain and perforated pipe sections. A complete theoretical model of this resonator allows for comparison between measured and predicted results of transfer functions from the external to internal sound fields of the resonator. The Nyquist plot of the admittance transfer function is extremely sensitive to the small resistance values, whereas the pressure transfer function gives more accurate results for resonant frequency and hence reactance than the usual method. In particular the results for resistance are so sensitive that it becomes possible to infer which of the current models for aperture resistance within the perforate is the most appropriate." @default.
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- W2078358054 date "2010-07-01" @default.
- W2078358054 modified "2023-10-16" @default.
- W2078358054 title "Acoustic impedance at the interface between a plain and a perforated pipe" @default.
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- W2078358054 doi "https://doi.org/10.1016/j.jsv.2010.01.037" @default.
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