## On the Dynamics of Short Pressure Probes: Some Design Factors Affecting Frequency ResponseNational Aeronautics and Space Administration, 1971 - Frequency response (Electrical engineering) - 25 pages |

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0.150-centimeter inside diameter A2 probes airstream AMPRES Analytical curve Annulus area to tube ASYMPTOTIC EXPANSION atmospheric pressure average pressure measuring average pressure tube average total pressure Bergh and Tijdeman BESSEL FUNCTION cyclic deviations decibels DECK COMPLEX FUNCTION diam dynamic viscosity experimental FREQ hertz increase in resonant kilohertz l.DO Lewis Research Center Measured frequency response Measured resonant frequency measured response measuring systems mounted at right particle impact protection percent phase angle predict pressure tube diameter probe design probe diameter probe geometry probe response probe tested probe tube probe which includes QSUM quarter wavelength equation quency ratio and phase reduction in resonant reference resonant fre response of probes RETURN END IBFTC room temperature ROUTINE CALCULATES shown in figure specific heat ratio standing waves straight probe Tijdeman equations total pressure probes transducer Cavity volume transducer end transient response transient total pressure tube length tube volume turbojet variations in amplitude XPSUM(K