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Small-Signal Impedance of Short Tubes
The Journal of the Acoustical Society of America, 1953Relations 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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Traveling-Wave Tube Helix Impedance
Proceedings of the IRE, 1953The impedance parameter of a circular helix, from which the gain of a helix-type traveling wave amplifier is computed, is investigated for a "Tape-Helix" model. Results obtained in this paper indicate that the impedance has a smaller value than for the "Sheath-Helix" model, and is considerably reduced at larger values of ka, the ratio of the helix ...
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Frequency range of the acoustic impedance tube [PDF]
Many engineering applications call for the acoustic properties of materials to be known for the frequency range of 125 to 4000 Hz. According to current Australian and international standards, the present impedance tube apparatus in the Department of Mechanical Engineering laboratory at the University of Queensland is only able to produce results that ...
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Characterization of Condenser Tubes Coatings by Electrochemical Impedance
Corrosion Reviews, 1990Colombo A., Rocchini G., SPINELLI, Paolo
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A Vacuum Tube Impedance Bridge
Journal of the Optical Society of America, 1929openaire +1 more source
Static flow resistivity measurements based on the ISO 10534.2 standard impedance tube
Building and Environment, 2015Xiaojun Qiu, Jiancheng Tao
exaly