Results 251 to 260 of about 32,369 (300)
Acoustic impedances of ear canals measured by impedance tube
, 2007 During hearing sensitivity tests, the sound field is commonly generated by an earphone placed on a subject ear. One of the factors that can affect the sound transmission in the ear is the acoustic impedance of the ear canal. Its importance is related to the contribution of other elements involved in the transmission such as the earphone impedance.
Ciric, Dejan, Hammershøi, Dorte
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Acoustic impedance measurements of pulse tube refrigerators
Journal of Applied Physics, 2010 textComplex acoustic impedance is determined in a prototype refrigerator that can mimic orifice-type, inertance-type, and double inlet-type pulse tube refrigerators from simultaneous measurements of pressure and velocity oscillations at the cold end. The
Tetsushi Biwa +2 more
exaly +3 more sources
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The three-microphone impedance tube
The Journal of the Acoustical Society of America, 1988The two-microphone impedance tube technique introduced by Seybert and Ross, and Chung and Blaser, is now widely used and has recently been standardized by the ASTM. This standard does not account for the effects of wall attenuation on measurement accuracy.
J. S. Bolton, M. Kompella
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The Journal of the Acoustical Society of America, 1963
A lightweight impedance tube has been developed primarily as an instrument for practical research. It can be used also for precision measurements of acoustical-impedance and sound-absorption coefficients in both laboratory and field installations, over the frequency range 400 to 900 cps.
Raymond D. Berendt, Henry A. Schmidt
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A lightweight impedance tube has been developed primarily as an instrument for practical research. It can be used also for precision measurements of acoustical-impedance and sound-absorption coefficients in both laboratory and field installations, over the frequency range 400 to 900 cps.
Raymond D. Berendt, Henry A. Schmidt
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Development of an Indigenous Impedance Tube
Applied Mechanics and Materials, 2015Fabrication of an impedance tube for measuring sound absorption coefficient is presented in this paper. Transfer-function method is chosen for the sound absorption analysis. The impedance tube is designed and fabricated in accordance with ISO 10534-2. The tube is made from brass with diameter of 114.3 mm and length of 1.42 m.
Wei Hong Tan +4 more
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Acoustic Impedance of Rectangular Tubes
The Journal of the Acoustical Society of America, 1953An expression for the acoustic impedance of a section of infinite parallel planes is derived. Measured values of the impedance of long narrow rectangular tubes show good agreement with this theory when an appropriate end correction is used. The theory compares favorably with impedance measurements on short rectangular tubes or slits even when the ...
John K. Wood, George B. Thurston
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Impedance Measurements of Inertance Tubes for Pulse Tube Cryocoolers
Advanced Materials Research, 2013The impedance of the inertance tubes which include the mass flows, pressure amplitudes and phase shifts between them at the inlet of the inertance tubes were measured by correcting the mass flows at the surface of the compressor piston. The experimental results are compared with the theoretical values based on simplified turbulent-flow thermoacoustic ...
S.S. Li, Y.N. Wu
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Impedance Measurements of Inertance Tubes
AIP Conference Proceedings, 2006The flow impedance of an inertance tube of 5.74 mm inside diameter and 2.36 m long coupled to various reservoir volumes was measured and compared with that predicted by a model based on a transmission line analogy. Though data at other average pressures and temperatures were obtained, this paper focuses on data taken with an average pressure of 2.5 MPa
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Impeded natural convection in a rotating, radial tube
International Journal of Heat and Mass Transfer, 1993This paper is concerned with single-phase natural convection in a short, square-section, radial tube rotating under steady, laminar conditions. The differential equations governing continuity, momentum and energy in a rectangular cavity rotating about a vertical axis at various speeds are solved numerically using a finite-difference algorithm.
Lock, G. S. H., Zhao, Litong
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A high-impedance, cold-cathode triger tube
IRE Transactions on Electron Devices, 1956The tube to be described is a cold-cathode, gas-filled tetrode which triggers on extremely low signals. It was developed by the Raytheon Manufacturing Company in cooperation with the Diamond Ordnance Fuze Laboratories. Under pre-firing conditions, the tube passes a very small Townsend current of about 10-9amp. On application of a firing signal, current
M.J. Reddan, P. Stutsman, N. Spencer
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