The Measurement of Dynamic Pressure in Tank During the Compression Process

The measurement of dynamic pressure is quiet different from that of static pressure. It depends on the frequency resonance characters which are first discussed in this paper. It is obvious that the output of the measured dynamic pressure is no long proportional linearly to the input with the static sensitivity. The amplitude and the phase of the output both vary with the frequency of the pressure and the natural frequency of transducer. The analysis gives some guidance to us how to select proper sensor for practical need and how to improve the performance of the sensor under the given amplitude error. Besides, when the transducer is not flush with the tank wall but connected to the storage tank by a long narrow lead-in tube, a correcting model is presented which shows that the transducer measured pressure differs from the pressure in the tank. The transducer acts as a spring and the liquid in the tube as a mass. Further, this work is compared to the experiential computing equation and the difference is illustrated.