| Summary: | 碩士 === 國立雲林科技大學 === 機械工程技術研究所 === 88 === In this paper, a pneumatic proportional pressure control valve (PPPCV) is developed and constructed. This PPPCV is intended to be installed in a low-pressure diecasting machine and serves primarily as the pressure control element. An efficient dynamic model for this PPCV is also proposed. To calculate the nonlinear mass flow-rate of air through the valve orifice, we propose that the two important parameters of the valve orifice, the conductive value C and the critical pressure ratio b, are a linear function with exponential decay and a constant respectively. In addition, a Computational Fluid Dynamics (CFD) analytical software is used to find the functions of the parameters. Experimental results prove that the presented analytical model can well simulate the dynamic behavior of the developed PPPCV.
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