Results 241 to 250 of about 188,504 (277)

Comparative Study of Impedance Eduction Methods, Part 2: NASA Tests and Methodology

, 2013
A number of methods have been developed at NASA Langley Center for eduction of the acoustic impedance of sound-absorbing liners mounted in the wall of a flow duct.
Michael G. Jones, W. R. Watson, B. M. Howerton, S. Busse-Gerstengarbe   +3 more
semanticscholar   +2 more sources

Structure-constrained relative acoustic impedance using stratigraphic coordinates

, 2015
Acoustic impedance inversion involves conversion of seismic traces to a reflection coefficient time series and then into acoustic impedance. The usual assumption for the transformation of poststack seismic data into impedance is that seismic traces can ...
Parvaneh Karimi
semanticscholar   +1 more source

OS0717 Ultrasonic Testing Using Powder Coupling with Adjustable Acoustic Impedance

The Proceedings of the Materials and Mechanics Conference, 2012
Kazuya Mori, Kenji Hashimoto, Kazuhisa Era   +2 more
openaire   +3 more sources

Empirical model of the acoustic impedance of a circular orifice in grazing mean flow.

Journal of the Acoustical Society of America, 2003
Although there are many analytical and empirical models for orifice impedance, the predicted acoustical performance when adopting any one of them sometimes shows a large discrepancy with the measured result in some cases.
Seong-Hyun Lee, J. Ih
semanticscholar   +1 more source

Test Method for Impedance and Absorption of Acoustical Materials Using a Tube, Two Microphones and a Digital Frequency Analysis System

, 2010
openaire   +2 more sources

Optimized Design of High-Temperature Resistant Air-Coupled Ultrasonic Transducer (ACUT) Based on Single Acoustic Matching Layer

IEEE Sensors Journal
A high-temperature resistant air-coupled ultrasonic transducer (ACUT) was optimally designed with a single acoustic matching layer structure. The matching layer was prepared with an organosilicon substrate instead of traditional epoxy resin mixed with ...
Liang Zhang, Xinhu Xu, Xiaojie Wang, Lei Li, Hulin Guo, Lingcai Kong, Wanglong Shi, Jinliang Zang   +7 more
semanticscholar   +1 more source

Acoustic impedance and tympanometry with the retarded: a normative study.

Audiology, 1972
Acoustic impedance and tympanometry data were obtained from 100 institutionalized mentally retarded children representing a broad range of ages, etiological classifications, and measured intelligence levels.
R. T. Fulton, L. E. Lamb
semanticscholar   +1 more source

Measurement of the acoustic impedance of an orifice under a turbulent boundary layer

, 1976
The acoustic impedance of an orifice under a turbulent boundary layer was measured. A single orifice, 0.508 cm in diameter and 0.32 cm thick, was tested in a wind tunnel where the velocity was varied from 16 to 30 m/sec.
A. Goldman, R. Panton
semanticscholar   +1 more source

Measurements of the acoustic input impedance of cat ears: 10 Hz to 20 kHz.

Journal of the Acoustical Society of America, 1994
The acoustic input impedence of the ear is a useful measure of the behavior of the middle ear and of its effect on the acoustics of the external ear.
Thomas J. Lynch, W. T. Peake, J. Rosowski   +2 more
semanticscholar   +1 more source

A Simple Tank Test for Inversion of Equivalent Acoustic Impedance of an Underwater Flat Plate

Transactions of the Korean Society for Noise and Vibration Engineering
Joo-Yeob Lee, Hyeok-Jin Choi, Kookhyun Kim, Sung-Ju Park, Dae-Seung Cho   +4 more
openaire   +2 more sources