Evaluation of a multi-point method for determining acoustic impedance
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Evaluation of a multi-point method for determining acoustic impedance

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Published by National Aeronautics and Space Administration, Langley Research Center in Hampton, Va .
Written in English

Subjects:

  • Acoustic impedance.

Book details:

Edition Notes

StatementMichael G. Jones and Tony L. Parrott.
SeriesNASA technical memorandum -- 100637.
ContributionsParrott, Tony L., Langley Research Center.
The Physical Object
FormatMicroform
Pagination1 v.
ID Numbers
Open LibraryOL18028473M

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The Multi-Point Method (MPM) presented in this report combines the strengths of the Standing Wave Method (SWM) and the Two-Microphone Method (TMM) while avoid- ACOUSTIC IMPEDANCE. A multipoint method for determining acoustic impedance was evaluated in comparison with the traditional standing wave and two-microphone methods using 30 test samples covering the reflection factor magnitude range Abstract An investigation was conducted to explore potential improvements provided by a Multi-Point Method (MPM) over the Standing Wave Method (SWM) and Two-Microphone Method (TMM) for determining acoustic impedance. A wave propagation model was developed to model the standing wave pattern in an impedance : Tony L. Parrott and Michael G. Jones. A multipoint method for determining acoustic impedance was evaluated in comparison with the traditional standing wave and two-microphone methods using 30 test samples covering the reflection factor magnitude range Author: Michael G. Jones and Tony L. Parrott.

“Standard test method for impedance and absorption of acoustical materials by the impedance tube method,” ASTM C a. Google Scholar; 9. M. G. Jones and T. L. Parrott, “Evaluation of a multi-point method for determining acoustic impedance,” Mech. Syst. Signal Process. J. 3, 15–35 (). Google Scholar; F. by: J. Pope, “Rapid measurement of acoustic impedance using a single microphone in a standing wave tube,” Proc. Paper M (). Google Scholar; M. G. Jones and T. L. Parrott, “Evaluation of a multi-point method for determining acoustic impedance,” Mech. Syst. Signal Proc. 3, 15–35 (). Google Scholar; by: Results from impedance eduction methods developed by NASA Langley Research Center are used throughout the acoustic liner community. Occasional anomalies persist with these methods at frequencies where the liner produces minimal attenuation. An approach to educe impedance spectra with increased confidence is demonstrated, by combining results from successive tests with different Cited by: 6. Results from impedance eduction methods developed by NASA Langley Research Center are used throughout the acoustic liner community. Occasional anomalies persist with these methods at Cited by: 6.

Experimental validation of a two-dimensional shear-flow model for determining acoustic impedance [microf Pressure probe and hot-film probe responses to acoustic excitation in mean flow [microform] / Tony L. Pa Evaluation of a multi-point method for determining acoustic impedance [microform] / Michael G. Jones and. Get this from a library! Evaluation of a multi-point method for determining acoustic impedance. [Michael G Jones; Tony L Parrott; Langley Research Center.]. subsurface may not be prohibitive. Reflection seismic methods provide fine structural detail and refraction methods provide precise estimates of depth to lithologies of differing acoustic impedance. The refraction method has been used in mineral investigations to map low-velocity alluvial deposits such as those that may contain gold, tin, or sand. quirements of the acoustic impedance matrix for calculation of the sound power using the boundary element method can be greatly reduced. In order to compute the acoustic radiation modes, the impedance matrix needs to be symmetric. However, when using the boundary element method, it is often found that the impedance matrix is not symmetric. ThisCited by: 1.