Precision flow control of spool valve using CFD simulation database in low-flowrate range

초록

This study provides basic research on the precise flow control of a hydraulic system using the pressure input and a database. In particular, the flow characteristics in the low-flowrate range, in which the spool of the valve begins to open, are analyzed. A precise flow control based on the numerical database and measured pressure signals is implemented, and its accuracy is identified. The flow characteristics at the opening displacements of a notch installed at the end of the spool valve are expressed uisng a surface model via a CFD analysis and the experimental data. In addition, a numerical analysis of this study is performed using FLUENT 18.1. The displacement of the spool is precisely controlled by a nozzle flapper-type servo valve with a feedback controller based on the Arduino Uno software. Here, the hydraulic valve flowrate control, which uses the CFD database and valve pressure signals, can be performed within a specified accuracy. © 2019 The Korean Society of Mechanical Engineers.

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