Abstract
The characteristics of transient pipe flow influence the dynamic behavior of an oil hydraulic system. It is thus important to consider the transient flow in an oil hydraulic pipeline to determine the performance of the hydraulic system. In this paper, it is clarified that the calculation process for a transient pipeline system which, to date, has been performed using a computer program, is displayed wholly by one discrete-time block diagram. This block diagram consists only of time delay elements, proportion elements, and addition elements. A highly precise simulation result can be immediately obtained by drawing a block diagram on the display of a personal computer, using GUI (graphical user interface) simulation software. The pressure, flow velocity, and pressure loss are easily obtained at all points along a pipeline. Visual understanding of the calculation process is also facilitated.
Since the calculation process is displayed in the form of a block diagram using z transformation, the frequency response of the pipeline system, for which the characteristic method is used, is obtained by calculating the gain and phase of the discrete-time block diagram.
