Results 271 to 280 of about 232,461 (350)
Modal Decomposition Method for Acoustic Impedance Testing in Rectangular Ducts
44th AIAA Aerospace Sciences Meeting and Exhibit, 2006 Accurate duct acoustic propagation models are required to characterize and reduce aircraft engine noise. These models ultimately rely on measurements of acoustic impedance for candidate materials used in engine nacelle liners. This paper seeks to increase the frequency range of normal incidence acoustic impedance testing in square ducts by extending ...
Todd Schultz +2 more
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Test Method for Impedance and Absorption of Acoustical Materials by Impedance Tube Method
, 2008 E33 Committee
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Modal decomposition method for high-frequency acoustic impedance testing
The Journal of the Acoustical Society of America, 2005 Accurate duct acoustic propagation models are required to characterize and reduce aircraft engine noise. These models ultimately rely on measurements of acoustic impedance for candidate materials used in engine nacelle liners. This paper seeks to increase the frequency range of acoustic impedance testing by extending the standard two-microphone method (
Todd Schultz +2 more
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The bulk acoustic properties of a porous medium, derived from a single impedance test
The Journal of the Acoustical Society of America, 1999 In the majority of engineering applications, porous sound absorbing media may be treated as equivalent fluids, with vibration of the solid skeleton being neglected. Most measurement techniques for the bulk acoustic properties of such media (e.g., complex characteristic impedance and propagation constant) involve tests on large samples of material ...
A. Cummings
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On the Value of Acoustic Impedance Tests in the Clinic
International Journal of Audiology, 1971V. M. Priede, R. R. A. Coles
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12th AIAA/CEAS Aeroacoustics Conference (27th AIAA Aeroacoustics Conference), 2006 Accurate duct acoustic propagation models are required to predict and mitigate radiated aircraft engine noise. These models ultimately rely on acoustic impedance measurements to characterize candidate engine nacelle liner materials. This paper compares two different methods for normal incidence acoustic impedance testing: the two-microphone method (TMM)
Todd Schultz +2 more
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Test Method for Impedance and Absorption of Acoustical Materials by Impedance Tube Method
, 2022 E33 Committee
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[Clinical applications of acoustic impedance tests].
Annali di laringologia, otologia, rinologia, faringologia, 1975 This manuscript briefly outlines the most important areas of clinical impedance audiometry. The author has emphasized the use of impedance audiometry in differentiating different types of middle ear pathology and utilizing the stapedial reflex in the determination of malingering as well as an overall test of the auditory function of the auditory ...
Vittorio Colletti
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Seismic Acoustic Impedance Inversion Using Reweighted L1-Norm Sparse Constraint
IEEE Geoscience and Remote Sensing Letters, 2022Sparse impedance inversion is widely applied for hydrocarbon prediction. Due to the low sparseness of traditional sparse constraints, pseudolayer and low-resolution problems still exist.
Liangsheng He +3 more
semanticscholar +1 more source