CHARACTERIZATION OF A PROTOTYPE PISTON-CYLINDER UNIT DESIGNED AND MANUFACTURED WORKING IN THE PRESSURE RANGE 0.5-35 MPA HYDRAULIC MODE

Levent Yagmur, E. Fatih Bagli

Abstract

The prototype piston-cylinder unit covering a pressure range of 0.5-35 MPa in the hydraulic mode and its assembly was designed and manufactured. The elastic distortion coefficient, lambda (?) of the piston- cylinder unit of a prototype pressure balance, used in primary standard gauges, was experimentally and analytically determined using cross-floating method and a Finite Element Analysis (FEA) software respectively. Since it is a well-known phenomenon that the elastic distortions in the piston and cylinder materials contribute as a source of high uncertainty among the total uncertainty budget, this study mainly focuses on the precise determination of lambda and also is given a short summary for the design and the manufacturing processes of the device. Having been characterized and where the FEA model of the piston-cylinder assembly was a rather simple one in early studies (as a master’s thesis given in reference [2]), this model was developed as described in the text and a better determination of the elastic distortion coefficient has been achieved using an analytical method taking into account the elastic distortions in both piston and cylinder in an iterative way.

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IMEKO TC

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

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