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View Paper |
Session Topic: 1C, Pressure Session |
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Paper Title: A New Design of the Piston-Cylinder Assembly for Advanced Metrological Characteristics |
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Date & Time: MONDAY, August 5, 2002 |
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10:45am - 12:15pm
PARALLEL SESSIONS - SESSION 1 |
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Speaker: S. Y. Woo
KRISS |
Email: sywoo@kriss.re.kr |
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Oil piston gauges are well-known standard instruments for measuring high pressure with high accuracy. Most of them adopt simple cylinder designs for piston-cylinder assemblies in order to utilize its ease of characterization. In general, the dependence of effective area upon applied pressure, for an assembly of simple cylinder design, is characterized as a linear function of pressure, i.e., Ap = Ao (1 + Lp) where L is termed the pressure distortion coefficient being considered as a constant. For simple design, normally O-ring seal is used at the bottom face of the cylinder body for the purpose of providing measuring pressure seal. Due to the upward force acting upon the bottom surface of the cylinder, the distortion coefficient is not constant but varies with pressure. By doing proper cylinder design change, this effect can be reduced significantly. This paper gives some ideas to get rid of these non-linear characteristics and shows some results obtained from FEA analysis based on the numerical iterative method. |
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