AN APPROACH TO EXTENDING THE POTENTIAL OF THE REMOTE MEASUREMENT METHOD FOR UNSTEADY-FLOW RATE USING HYDRAULIC PIPELINE DYNAMICS - (INTERPOLATION METHOD AND EXTRAPOLATION METHOD)

In this paper we describe an approach for estimating unsteady flow rat e through oil hydraulic pipelines and components in real time. Recentl y we have proposed following the three unsteady flow rate measurement approaches, RIFM, QIFM and TPFM, in which hydraulic pipeline dynamics are utilized. In this paper, we firstly propose new approaches, i. e., an interpolation method and an extrapolation method in combination wi th RIFM and TPFM. In the interpolation method, unsteady flow rate at a n arbitrary internal location between two points along the pipeline fo r measuring the two-point pressure can be estimated. In the extrapolat ion method, unsteady flow rate can be estimated at an arbitrary point along the pipeline located in the outer region of the two points for m easuring the two-point pressure. In this paper, the accuracy and the d ynamic response of the interpolation method and the extrapolation meth od are experimentally investigated in detail.