scholarly journals Three-microphone probe bias errors for acoustic intensity and specific acoustic impedance

2018 ◽  
Vol 143 (2) ◽  
pp. EL81-EL86 ◽  
Author(s):  
Joseph S. Lawrence ◽  
Eric B. Whiting ◽  
Kent L. Gee ◽  
Reese D. Rasband ◽  
Tracianne B. Neilsen ◽  
...  
Keyword(s):  
Acoustic Impedance ◽  
Acoustic Intensity

Bias error analysis for phase and amplitude gradient estimation of acoustic intensity and specific acoustic impedance

2017 ◽  
Vol 142 (4) ◽  
pp. 2208-2218 ◽  
Author(s):  
Eric B. Whiting ◽  
Joseph S. Lawrence ◽  
Kent L. Gee ◽  
Tracianne B. Neilsen ◽  
Scott D. Sommerfeldt
Keyword(s):  
Error Analysis ◽  
Acoustic Impedance ◽  
Bias Error ◽  
Gradient Estimation ◽  
Acoustic Intensity

Acoustic Intensity and Specific Acoustic Impedance

2021 ◽  
pp. 81-116
Author(s):  
Hejie Lin ◽  
Turgay Bengisu ◽  
Zissimos P. Mourelatos
Keyword(s):  
Acoustic Impedance ◽  
Acoustic Intensity

scholarly journals Non-Negative Intensity for Structures with Inhomogeneous Damping

2019 ◽  
Vol 27 (01) ◽  
pp. 1850050 ◽  
Author(s):  
Daipei Liu ◽  
Steffen Marburg ◽  
Christian Geweth ◽  
Nicole Kessissoglou
Keyword(s):  
Cylindrical Shell ◽  
Acoustic Impedance ◽  
Acoustic Pressure ◽  
Sound Radiation ◽  
Far Field ◽  
Impedance Matrix ◽  
Acoustic Intensity ◽  
Rayleigh Damping ◽  
Surface Areas ◽  
Structural Surface

In this work, numerical methods to identify the surface areas of a vibrating structure that radiate sound are implemented for cases of structures with inhomogeneous distributions of viscous Rayleigh damping. The intensity-based techniques correspond to acoustic intensity evaluated in terms of the acoustic pressure and particle velocity, non-negative intensity evaluated in terms of the acoustic impedance matrix obtained at the structural surface, and back-calculated non-negative intensity evaluated in terms of the acoustic impedance matrix obtained at a far-field receiver surface. Different configurations of inhomogeneous damping are applied to two elastic structures corresponding to a plate and a cylindrical shell. To examine the influence of inhomogeneous damping on sound radiation, the acoustic intensity on the structural surface, the acoustic intensity on several different far-field receiver surfaces, non-negative intensity and back-calculated non-negative intensity are numerically compared for different inhomogeneous damping cases.

Acoustic-Reflex Dynamics for Pulsed Signals

1978 ◽  
Vol 21 (2) ◽  
pp. 295-308
Author(s):  
Terry L. Wiley ◽  
Raymond S. Karlovich
Keyword(s):  
Duty Cycle ◽  
Acoustic Impedance ◽  
Normal Hearing ◽  
Broadband Noise ◽  
Threshold Shift ◽  
Temporary Threshold Shift ◽  
Acoustic Reflex ◽  
Stapedius Muscle ◽  
Duty Cycles

Contralateral acoustic-reflex measurements were taken for 10 normal-hearing subjects using a pulsed broadband noise as the reflex-activating signal. Acoustic impedance was measured at selected times during the on (response maximum) and off (response minimum) portions of the pulsed activator over a 2-min interval as a function of activator period and duty cycle. Major findings were that response maxima increased as a function of time for longer duty cycles and that response minima increased as a function of time for all duty cycles. It is hypothesized that these findings are attributable to the recovery characteristics of the stapedius muscle. An explanation of portions of the results from previous temporary threshold shift experiments on the basis of acoustic-reflex dynamics is proposed.

GAS HYDRATE SATURATION ESTIMATED FROM ACOUSTIC IMPEDANCE IN THE ANDAMAN SEA, INDIA

2014 ◽  
Vol 33 (2) ◽  
pp. 163-168
Author(s):  
Xiujuan WANG ◽  
Jiliang WANG ◽  
Wei LI ◽  
Nittala Satyavani ◽  
Kalachand Sain
Keyword(s):  
Gas Hydrate ◽  
Acoustic Impedance ◽  
Andaman Sea ◽  
Hydrate Saturation
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