Oscillation Phenomena in a Conduit with a Pilot-Valve and a Pulsating Flow Source

Abstract

Oscillation phenomena of an oil column in a conduit are analyzed. Both ends of the conduit are connected to a pulsating flow source (gear pump) and an elastically supported pilot valve. Results obtained are summarized as follows: (1) A self-excited oscillation is possible to occur even if the pump pulsation is ignored. (2) When the condition of self-excitation is fulfiled, an out standing oscillation arises in the system under the influence of the pump pulsation. (3) Both of harmonic and combination oscillations can occur depending on the operating condition of the system. (4) Analytical results based on a mathematical model of the system agree fairly well with experiments.