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- W1978396499 abstract "The question addressed in this work is the determination of the practical capability of model-based methods to reconstruct a given acoustic source distribution from either pressure-based or velocity-based measurements at field points inside a cylindrical duct. An analytical model has first been implemented for the sound field due to elementary sources in a hard-walled duct of finite length. An interpretation is proposed of in-duct multi-modal propagation in terms of wavenumber-filtering. Due to the modal characteristic impedance terms, spatial low-pass filtering is associated to pressure-based field whereas this filter factor does not appear when considering velocity-based field. The inversion of the pressure-based frequency response functions involves a reciprocal factor which amplifies the high spatial frequency and increases the numerical instability of the inversion. It is found that, under non-ideal conditions, i.e. at low frequency and beyond the near-field zone, velocity-based field measurements are more favourable than pressure-based field measurements for acoustic source reconstruction in terms of both accuracy and spatial resolution." @default.
- W1978396499 created "2016-06-24" @default.
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- W1978396499 date "2007-05-21" @default.
- W1978396499 modified "2023-09-27" @default.
- W1978396499 title "In-Duct Acoustic Source Reconstruction from Pressure and Velocity-Based Measurements" @default.
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- W1978396499 doi "https://doi.org/10.2514/6.2007-3442" @default.
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