Read e-book online Aeroacoustic Measurements PDF

By Thomas J. Mueller, Christopher S. Allen, William K. Blake, Robert P. Dougherty, Denis Lynch, Paul T. Soderman, James R. Underbrink

ISBN-10: 3642075142

ISBN-13: 9783642075148

ISBN-10: 3662050587

ISBN-13: 9783662050583

The target of aeroacoustic measurements is to supply a foundation for assessing mechanisms of noise iteration, and to increase tools of decreasing noise to extra applicable degrees. although, the measurements themselves are complicated, and require a deep figuring out of the experimental facility applied (such as a wind tunnel), dimension instrumentation, and knowledge research suggestions.
In this quantity contemporary advances within the dimension and figuring out of aerodynamically generated sound are offered by way of leaders within the improvement of latest recommendations during this box. either simple and utilized difficulties are coated in detail.

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Reflections in a Semi-Anechoic Environment 29 o~~----,----,---,-,-,-,-,,,------~~ ~ -10 ++ . . . . . . . . . . . . ;!. .. ~ -20 wind tlUUlC data + . . . . . . . . . . . . +:.......................... -\ +. \: . 95 -30+-------~----~-+--+-+-~~~~----~~ 1 10 5 microphone distance fj·01D source, m 20 Fig. 18. Sound decay interference envelopes computed for a 1 kHz tone emitted in a 12-m high test section. Multiple envelopes are shown for various values of surface sound absorption coefficients between 0 (hard wall) and 1 (perfectly absorbent).

To do that, it is necessary to use special techniques to isolate individual noise sources and extrapolate the sound from each source to the far field. In the far field, the results can be integrated. This was done previously by using dual lines of microphones and tracing spectral peak levels from one line to the other and deducing the propagation path (Soderman et al. 1991). Today, directional receivers such as phased microphone arrays, reflective dishes, and sound intensity probes are employed to better isolate specific source regions (Soderman 1999).

M . . H ........ N . . N ••••••••••••••••••••••••••••• -"'--. ------- -----HFF --HFR ...................................... --+-HpR 0 r:Q "0 ::rf -5 -10 -15 0 20 40 60 80 100 frequency, kHz (oM = 187 Hz) Fig. 28. Typical B&K 4135 pressure response curve (lower), which when combined with a free-field effect curve (top) result in a free-field response curve (middle). Sound waves are normally incident to the diaphragm. 35 mm (Allen et al. 1995) Microphone Corrections at High Frequency 47 field response curve (middle).

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Aeroacoustic Measurements by Thomas J. Mueller, Christopher S. Allen, William K. Blake, Robert P. Dougherty, Denis Lynch, Paul T. Soderman, James R. Underbrink


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