Dynamic characteristics analysis of vibrating cylinder pressure transducers (VCPT)

The dynamic character of the vibrating cylinder pressure transducers (VCPT), which have frequency output ability, is studied in this paper. The oscillator's parametric excitement characteristic has been analyzed first. An approximate solution for the parametric excitement function is established through the theoretical analysis on the oscillator's parametric excitement characteristic and is validated by the numerical simulation. It was proved that the dynamic pressure demodulation is correlated with the average pressure, and the parametric excitement phenomenon will not lead to the variance of the phase difference between the input pressure and the frequency output. Then, the following theoretical and computational fluid dynamics (CFD) simulation analysis on the cavity effect and the Pipe-Damping Effect shows that the two effects generate a first order low pass filter like RC lowpass filter which makes the VCPT critical frequency as low as about 4-6 Hz, which is also verified by experiments data. So the main source that influences the dynamic characteristic drastically has been found out. And the corresponding design process flow for structural parameters optimization is proposed in the end to fulfill the specific dynamic index demands of VCPT, which is helpful to expand the VCPT application field. Crown