Results 261 to 270 of about 109,007 (299)

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
openaire   +1 more source

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
openaire   +2 more sources

Rapid impedance tube determination of fabric transparency

The Journal of the Acoustical Society of America, 2017
Acousticians are continually being asked to verify fabric transparency for applications with absorptive and diffusive surfaces, as well as in sound reinforcement. Standard reverberation chamber methods can be used, but require large fabric and fiberglass samples.
Peter D'Antonio, Trevor J. Cox
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ACCURATE LOW FREQUENCY IMPEDANCE TUBE MEASUREMENTS

See it Hear!, 2023
R OLDFIELD, F BECHWATI
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Multi microphone extension of impedance tube systems

Das Impedanzmessrohr ist ein weit verbreitetes Messsystem für die Bestimmung akustischer Materialeigenschaften. Dieses erfordert jedoch hoch genaue akustische Messhardware. In der vorliegenden Arbeit soll diese Art von Messungen durch die Verwendung günstiger Komponenten zugänglicher gemacht werden.
Huber, Felix Robert, Kraxberger, Florian, Toth, Florian   +2 more
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Factors impeding enteral tube feedings

Critical Care Medicine, 1999
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