Hydroacoustic Source Characterisation of Centrifugal Pumps

Experimental validation of an ultrasonic flowmeter for unsteady flows

“…o The use of pressure transducers flush mounted on the wall of pipes has been also used for the same kind of study [23], with a measurement frequency of around 8 kHz. • The analysis of instabilities associated, for example, with: o interactions between machines and systems in partial flow rates conditions such as the POGO oscillations caused by combustion instabilities in liquid propellant rocket engines [24,25] or o forced excitations with external devices [26][27][28] in order to access to an experimental characterization of natural frequencies of hydraulic systems: a minimum of two pressure transducers flush mounted on the wall in pipes is mainly used to access to the flow rate fluctuations, using adequate hydro-acoustic models [26].…”

Amelioration de technique d'intensimetrie hydroacoustique

“…Cependant dans certains cas (en particulier pour les machines) il faut recourir a une identification, par méthode inverse, de la matrice de transfert (Stirneman et Bolleter [1,2]), voire des « termes de source » de fluctuations si ce composant n'est pas simplement passif (Carta et al [3]). La prise en compte du couplage fluide-structure améliore singulièrement la qualité du vecteur d'état estimé.…”