Abstract
In a hydraulic system, a displacement pump inevitably produces flow pulsation which becomes a main source of pressure pulsation. This source pulsation travels throughout the working oil in the passageways inside hydraulic components as an incident wave, and then is reflected by both of these components and the termination of a circuit. The standing waves of pressure pulsation arise from the interference of the incident and reflected waves. It has been well known that the amplitude of pressure pulsation becomes extremely high when the frequency of the source flow pulsation coincides with the resonance frequency of the standing waves. Therefore pump rotational speed or length of a connecting pipe should be designed so as to avoid the resonant modes of the standing waves. The final aim of this paper is to establish design tips for these parameters and clarify the standing wave characteristics in a pipe-line. In particular, the influence of the termination characteristics of the circuit on the resonant mode of the standing waves is investigated both numerically and experimentally.
