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- W2051673310 abstract "Any steady state acoustic field can be completely specified by spatially mapping the pressure amplitude and phase as a function of position and frequency. However, in many measurement situations, the observed pressure is not due entirely to the steady state field; but also contains random transients (either acoustic or nonacoustic). Using modern real time analysis equipment, it is possible to measure spatial variations in steady state acoustics-pressure amplitude and phase by taking the cross spectrum between two signals from probes in the same field or by taking the difference in complex. Fourier transforms of enhanced probe signals. The conceptual differences between these two approaches are examined, and each is used to analyzed pressure data from the inlets of two different turbo-machines. A complete mapping of this steady state field could be used to determine its modal content. A problem with long term non-stationary is found with both methods. Conditions for equivalence of the two methods are discussed." @default.
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- W2051673310 date "1976-04-01" @default.
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- W2051673310 title "Comparison of cross‐spectral and signal enhancement methods for mapping steady state acoustic fields in turbomachinery ducts" @default.
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- W2051673310 doi "https://doi.org/10.1121/1.2003001" @default.
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