Abstract
Step and impulse response tests have been performed for cavity-mounted pressure transducers subjected to pneumatic signals of 0.1 msec or shorter risetimes and 0.25 to 2kPa amplitudes.
The system is modeled as a second order nondimensional differential equation with the static resistance obtained experimentally and the dynamic one proportional to square root of the natural frequency. Theoretical response curves have a good agreement with experimental ones.
The overshoots of responses are lower and later for larger input pressures, and for larger volume ratios of cavity to hole. The oscillatory frequency after the overshoot is, unless the cavity is extremely flat, nearly equal to the natural frequency based on the orifice inertance with the double end-correction and the adiabatic capacitance of cavity. The response within an early few oscillations may be reasonably predicted by only a simple static resistance of constant discharge coefficient.
