Results 261 to 270 of about 109,970 (304)

Transverse Impedance of Two-Layer Tube

Proceedings of the 2005 Particle Accelerator Conference, 2006
The exact analytical expressions for the multipole longitudinal and transverse impedances of two-layer tube with finite wall thickness are obtained. The numerical examples for the impedances of the vacuum chamber with laminated walls are given.
M. Ivanyan, A.V. Tsakanian
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Automation of impedance tube measurements

The Journal of the Acoustical Society of America, 1975
An apparatus is described that enables the automatic determination of impedance tube data, namely, the positions of the first two minima and the standing-wave ratios along the tube. Subject Classification: 85.20.
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A two-microphone thermoacoustic impedance tube

The Journal of the Acoustical Society of America, 2000
An experimental arrangement has been developed to explore the thermoacoustic properties of stack materials. The apparatus may be viewed either as a thermoacoustic engine with two microphones mounted in the tube wall, or as a two-microphone impedance tube that accommodates thermoacoustic elements.
Timothy Simmons, Richard Raspet, Robert Hiller   +2 more
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Impedance tube technology for flow acoustics

Journal of Sound and Vibration, 1981
Acoustic impedance of a termination, or of a passive subsystem, needs to be measured not only for acoustic lining materials but also in the exhaust systems of flow machinery, where mean flow introduces peculiar problems. Out of the various methods of measurement of acoustic impedance, the discrete frequency, steady state, impedance tube method [1] is ...
Panicker, VB, Munjal, ML
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Impeded natural convection in a rotating, radial tube

International Journal of Heat and Mass Transfer, 1993
This 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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Data acquisition software for impedance tube measurements

2022
Transmission impedance tube measurements are necessary to measure the asymmetric acoustic property known as Willis coupling. However, software is required to measure and store data from an impedance tube for acoustic material characterization. This report details the overall structure of custom-developed software built from low-level functions ...
Cody Best, Carl Hart, Michael Muhlestein
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Time-domain simulation of acoustic impedance tubes

Journal of the Brazilian Society of Mechanical Sciences and Engineering, 2016
The two-microphone impedance tube method is widely used to measure the absorption and reflection characteristics of acoustic materials under normal incidence. The design of an impedance tube requires a proper choice of the tube dimensions, microphone positions, type of the excitation signal, and loudspeaker response.
Alexander Mattioli Pasqual, Luana Torquete Lara   +1 more
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Small-Signal Impedance of Short Tubes

The Journal of the Acoustical Society of America, 1953
Relations expressing the acoustic inertance and resistance of short open tubes in terms of kva are reviewed. The tube radius is a; kv is the complex wave number for viscosity waves. Analogous relations giving the acoustical impedance of a cylindrical cavity in terms of kTa, where kT is the thermal wave number, are considered. Viscous and thermal losses
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Lattice Boltzmann simulations of impedance tube flows

Computers & Fluids, 2009
zbMATH Open Web Interface contents unavailable due to conflicting licenses.
Toutant, Adrien, Sagaut, P.
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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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