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김도태,윤인균 한국공작기계학회 2001 한국생산제조학회지 Vol.10 No.1
This study deals with a flow and pressure ripple characteristics for a hydrostatic transmission (HST) consisting of a variable axial piston pump connected in an open loop to a fixed displacement axial piston motor. These flow ripples produced by pump and motor in HST interacts with the source impedances of the pump or motor and dynamic characteristics of the connected pipeline, and results in a pressure ripples. Pressure ripples in HST is major source of vibration, which can lead to fatigue failure of components and cause noise. In this paper, the flow ripples generated by a swash plate type axial piston pump or motor in HST are measured by making use of hydraulic pipeline dynamics and the measured pressure data at two points along the pipeline. By using the self-checking functions, the validity of the method is investigated by comparison with the measured and estimated pressure ripples at the halfway section of the pipeline, and good agreement is achieved.