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As already done for a 120 MPa full scale hydraulic pressure balance [1, 2 and 3], a new piston cylinder assembly for 36 MPa full scale has been developed within a cooperation between Istituto Nazionale di Ricerca Metrologica (INRIM) and Scandura & FEM company. For a better characterisation of this assembly a FEM analysis has been also done in cooperation with the University of Cassino. All the experimental and numerical results are here presented. The most important aspect of this work is the new design of the cylinder’s shape, compared to the 120 MPa unit, and its impact on the metrological characteristic of the new piston-cylinder assembly. From the FEM analysis results, it is possible to put in relationship the piston cylinder gap with the influence of the assembly’s verticality on the estimated pressure uncertainty values. References [1] Caravaggio M., Molinar Min Beciet G. and De Maria P., 2006, Pressure balances for industrial applications up to 120 MPa, Third APMP Pressure and Vacuum Workshop: AdMet-2006, NPL-India, New Delhi, India, 11-13 December 2006 (Proceedings available on CD, paper n. 44, page 456-459) [2]Caravaggio M., Molinar Min Beciet G., De Maria P., Buonanno G. and Giovinco G., Industrial pressure balance up to 120 MPa in liquid:FEM analysis and comparison with experimental data, Proceedings of the 7th Metrology Society of Australia Conference, Adelaide, 25-27 July 2007, pages 64-69[3] Caravaggio M., Molinar Min Beciet G., De Maria P., Buonanno G. and Giovinco G., FEM analysis for an industrial pressure balance from 3 MPa to 120 MPa in liquid medium, Conference Proceedings on CD of the International Conference IMEKO TC16, Merida, Mexico, 26-30 November 2007, (paper ID_075) |
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