EVALUATION OF PRESSURE DISTORTION COEFFICIENT FOR 200 MPa PISTON CYLINDER ASSEMBLY

A.E.Eltawil, S.S.Kishk, A.M.Fawzy, M.A.Kenawy, M.I.Elanwar

Abstract

Recently a special attention has been given to the design and metrological characteristics of pressure balance, in particular to the evaluation of pressure distortion coefficient of piston cylinder assembly effective area. In high pressure range namely above 50 MPa, a change of the effective area of piston cylinder units due to elastic distortions becomes one of the main sources of uncertainty of the measured pressure. The elastic distortion coefficient for piston cylinder unit of range 200 MPa used at National Institute of Standards (NIS) was measured through cross-floating experiment and calculated using the finite element analysis method (FEA). The results obtained by these means (numerical and experimental) were compared for the NIS piston cylinder assembly up to 200 MPa.

Keywords

Pressure, Pressure balance, Distortion coefficient, Finite element analysis (FEA) , Cross-floating

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IMEKO TC

TC3 - Measurement of Force, Mass, Torque, and Gravity

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