Noise, Vibration and Pulsation Problems in Oil Hydraulic Components and Systems

Abstract

Primary concerns in the engineering problem of the oil hydraulics are a synergy of the pressurised media, hydraulic components and systems. In the oil hydraulics, the pressure is roughly divided as (1) Low pressure (lower than 70–100 bar), (2) Medium pressure (over 70–100 to 250 bar), (3) High pressure (over 250–350 bar) and (4) Higher pressure system (350–450 bar). There are several kinds of problems in the hydraulics; however, we will mainly discuss and deal with the pressure and flow pulsation problems in hydraulics and also the vibration and noise problems in the hydraulic components and systems, and particularly the problems above are apt to appear at high pressure conditions. In consequence, we need the five-fathom deep qualification to the oil hydraulics and concerns in solving the engineering problem. Needless to say, because of the high pressure and high power density in the hydraulics, the design should be deliberated in balancing the high force acting on the parts inside the devices. Therefore, it is first necessary to understand the outline of oil hydraulics.