Characterization of the IMGC-DH100L pressure balance using finite element analysis

G. Buonanno , J. Man, G. Molinar Min Beciet

Abstract

The National Measurement Institute of Australia (NMIA) and the Istituto Nazionale di Ricerca Metrologia of Italy together with the University of Cassino (INRIM/UNICAS) have participated in a research project to characterise a INRIM 100 MPa free deformation piston and cylinder assembly using two different numerical procedures based on a finite element method (FEM). The pressure distortion coefficient, ? and the piston fall rates, v were calculated from the clearance profile between the piston and cylinder obtained from dimensional measurement data. Comparison of the numerical results obtained by the two groups showed a relative difference of 2 × 10^-4 in &lambda; and 2.5 × 10^-2 in <i>v</i>. The numerical results were also compared to the experimental results with a relative difference of 1.9 % in &lambda; and 16 % at 100 MPa in <i>v</i>. This paper presents the numerical model used for the calculations of the pressure distortion coefficient and the piston fall rates with a sensitivity analysis of the model for the estimation of the uncertainty values of these two parameters.

Keywords

Finite element method (FEM), pressure balance, pressure distortion coefficient

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IMEKO-TC16-2007-076u.pdf

DOI

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IMEKO TC

TC16 - Pressure and Vacuum Measurement

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