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Hiroaki Kajikawa,Kazunori Ide,Tokihiko Kobat 제어로봇시스템학회 2009 제어로봇시스템학회 국제학술대회 논문집 Vol.2009 No.8
A new pressure balance with a controlled-clearance (CC) piston-cylinder has been developed with the aim of reducing the uncertainty of the pressure especially at high pressure. The effective area of the CC piston-cylinder was estimated based on the Heydemann-Welch model. Two parameters in this model, the jacket pressure coefficient and the zero clearance jacket pressure, were determined from characterization experiments. Then, the pressure dependence of the effective area and its uncertainty were calculated. In this paper, the uncertainty of the effective area for a 100 MPa piston-cylinder is evaluated in detail. The resultant uncertainty of the pressure dependence of the effective area was found to be less than 0.7 × 10<SUP>?7</SUP> MPa<SUP>?1</SUP> at pressures higher than 20 MPa.