Dynamic performance improvement on resonant vibration cylinder pressure transducer

This paper researches on the dynamic performance of a kind of commercial resonant vibration cylinder pressure transducers. The problem of its poor dynamic performance is dealt with by two different approaches. Firstly, in our previous work, it has been justified theoretically by analyzing the structure of this kind of transducers that the effect of impulse tube has influence on its dynamic performance. This paper provides a modified method and verifies it by experiments. Moreover, the dynamic mathematical model (discrete transfer function) of a resonant vibration cylinder pressure transducer is established using the method of system identification based on the experimental data of step-excitation calibrations. In order to improve the dynamic performance of existing structural transducer, a dynamic compensating digital filter is designed by re-disposing zero-pole points. Results show that the cutoff frequency of compensated resonant vibration cylinder pressure transducer is extended separately from 3.8 Hz to 22.4 Hz by structure improvement method and to 14.2 Hz by dynamic compensation method, the dynamic performance is significantly improved.