Acoustic characterization of hydraulic systems: application to POGO Phenomenon
Résumé
This paper presents an experimental methodology for the evaluation of dynamic transfer matrices using three pressure sensors. The experimental study was carried out at the CREMHyG's acoustic test rig. The speed of sound in the pipe, as well as discharge fluctuations were evaluated from the pressure fluctuations measured during tests carried out under excitation of a modulator (piston). The method applied to reconstitute flow rate fluctuations from pressure sensors were validated by comparisons with piston displacement measurements. The transfer matrices for straight pipes and POGO corrective devices were identified based on electrical analogy. The identification method was validated by comparing the transfer matrix components to theoretical values. The results can be applied in the future, in the case of space rocket.
