Renovation of Nmij's 5 MN Hydraulic Amplification Type Force Standard Machine
Abstract
The 5 MN hydraulic amplification type force standard machine was renovated by replacing its hydraulic pressure control system, measuring ram and cylinder. For re-evaluation of uncertainty of force amplification factor, diameters of the main and mearsuring rams and cylinders were re-measured. A programmable logic controller with a personal computer is used to control the weight motion and the valve actuation, to monitor various kinds of sensors output, and to record readings of a force transducer under calibration. Fluctuation of calibration force was suppressed by using a quartz-resonance type pressure gauge, and measurement repeatability was improved to some extent. However, there remains room for improvement to further stabilize the calibration force by modifying the measuring ram.
- Publication:
-
International Journal of Modern Physics Conference Series
- Pub Date:
- 2013
- DOI:
- 10.1142/S2010194513600112
- Bibcode:
- 2013IJMPS..2460011H
- Keywords:
-
- Hydraulic amplification type force standard machine;
- automation;
- oil pressure;
- proportional-integral-derivative control;
- servo valve