Results 291 to 300 of about 1,265,505 (345)
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A Wide Range Adjustable Acoustic Impedance
The Journal of the Acoustical Society of America, 1944A method for obtaining a wide range of calculable impedance values has been developed. Three telescoping tubes are used, one being acoustically “infinite” in length. This “infinite” tube is used as a convenient, calculable impedance terminating the device.
Willard F. Meeker, Frank H. Slaymaker
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Asymmetric Absorption in Acoustic Metamirror Based on Surface Impedance Engineering
Physical Review Applied, 2019Angle-dependent asymmetric acoustic absorption attracts growing interest, due to its great importance in various applications where directional responses are required, such as acoustic antennas, sensing, and angle-encoded steganography (concealed ...
Ailing Song +6 more
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Marine Structures, 2019
The three-dimensional sono-elasticity method recently developed by Zou et al. [1,2] is employed to model the coupled acoustic radiation of the submarine induced by the propeller-shaft system.
Li-bo Qi +3 more
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The three-dimensional sono-elasticity method recently developed by Zou et al. [1,2] is employed to model the coupled acoustic radiation of the submarine induced by the propeller-shaft system.
Li-bo Qi +3 more
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Active acoustical impedance using distributed electrodynamical transducers
The Journal of the Acoustical Society of America, 2006New miniaturization and integration capabilities available from emerging microelectromechanical system (MEMS) technology will allow silicon-based artificial skins involving thousands of elementary actuators to be developed in the near future. SMART structures combining large arrays of elementary motion pixels coated with macroscopic components are thus
M, Collet, P, David, M, Berthillier
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Tonndorf and acoustic impedance
The Journal of the Acoustical Society of America, 1990Juergen was full of ideas that reflected his excellent understanding of the limits of technology and science. At first many of his ideas seemed impractical, but in my experience, he was usually right on target and got the results or data he was after. I learned many practice things from him in the lab; almost every encounter brought a new point of view
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Acoustical Impedance of Enclosures
The Journal of the Acoustical Society of America, 1947Formulas are derived for the acoustical impedance of three types of enclosures, a sphere, a cylinder, and a narrow rectangular box. The solutions are valid throughout the entire range from adiabatic to isothermal conditions.
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Measurement of Acoustic Impedance
The Journal of the Acoustical Society of America, 1948In this paper a method is described of measuring the acoustic impedance of a sample of material forming one boundary of a shallow cylindrical cavity, by determining the sound pressure produced when a known volume current is injected into the cavity from a high impedance source. The volume current is effectively determined by observing the pressure when
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Acoustic Impedance of Sample from Motional Impedance Diagrams
The Journal of the Acoustical Society of America, 1948If the electrical impedance of an electromagnetic speaker is plotted as a vector when the acoustic loading consists of an air column of variable length terminated by a rigid plug, a circle diagram results. If the air column is terminated instead by an acoustic sample, a second circle diagram results.
R. D. Fay, J. E. White
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A Method of Measuring Acoustic Impedance
The Journal of the Acoustical Society of America, 1932An apparatus s described whereby acoustic impedances may be measured in terms of a known acoustic impedance and the complex ratios of two electrical potentiometer readings to a third. As a known impedance, there is chosen the reactance of a closed tube of uniform bore which is an eighth wave-length long.
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Acoustic Neuromas and the Acoustic Impedance of the Ear
Journal of Speech and Hearing Disorders, 1973The acoustic impedance at the tympanic membrane was measured at frequencies in the range 100–1000 Hz and found to be abnormal on the affected side in four patients with acoustic neuroma. In all four the resistance was abnormally high at low frequencies on the affected side, and in three the reactance of the affected ear was raised relative to that of ...
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