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A new tubing system for the measurement of fluctuating pressures
Abstract A new technique for the design of pressure tubing systems with lengths up to about 2 m is suggested. The method utilizes a controlled leakage at the transducer end of the tube to avoid resonance in the system. Single tubes as well as systems including manifolds are considered. For the theoretical verification of the procedure, the electric analogy is applied instead of the direct solution of the fluid dynamic equations of motion used in the conventional design of distortion-free pressure transmission tubes. The electric analogy presented is simpler and gives an easier appreciation of the main parameters affecting the pressure transmission. The frequency range, as well as the feasible length of the tube, have been considerably improved compared to the characteristics for the usual closed tubing systems. For example, for a tube length of 1 m the transfer function is constant within 1–2% for frequencies less than about 200 Hz and 10% for frequencies less than 350 Hz. In the author's opinion the method is superior to the procedures commonly used at wind tunnel laboratories, when mean as well as fluctuating pressures are of importance. However, it should be emphasized that a calibration of the system is necessary, even for mean pressures alone. In this respect the method is more laborious than commonly known procedures.
A new tubing system for the measurement of fluctuating pressures
Abstract A new technique for the design of pressure tubing systems with lengths up to about 2 m is suggested. The method utilizes a controlled leakage at the transducer end of the tube to avoid resonance in the system. Single tubes as well as systems including manifolds are considered. For the theoretical verification of the procedure, the electric analogy is applied instead of the direct solution of the fluid dynamic equations of motion used in the conventional design of distortion-free pressure transmission tubes. The electric analogy presented is simpler and gives an easier appreciation of the main parameters affecting the pressure transmission. The frequency range, as well as the feasible length of the tube, have been considerably improved compared to the characteristics for the usual closed tubing systems. For example, for a tube length of 1 m the transfer function is constant within 1–2% for frequencies less than about 200 Hz and 10% for frequencies less than 350 Hz. In the author's opinion the method is superior to the procedures commonly used at wind tunnel laboratories, when mean as well as fluctuating pressures are of importance. However, it should be emphasized that a calibration of the system is necessary, even for mean pressures alone. In this respect the method is more laborious than commonly known procedures.
A new tubing system for the measurement of fluctuating pressures
Gerstoft, P. (Autor:in) / Hansen, S.O. (Autor:in)
Journal of Wind Engineering and Industrial Aerodynamics ; 25 ; 335-354
03.10.1986
20 pages
Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch
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