A Measurement Method to Determine the Working Length of the Arm in Torque Standard Machine
Main Article Content
Abstract
Torque is one of the derived quantities in the International Measurement Units System (SI), which is used more and more with industrial developing. The measurement accuracy of torque quantity depends on three main factors: accuracy of the working length of the arm, the uncertainty of the acting force, the friction torque of the bearing, etc. In the world, some countries have their primary torque standard machines to calibrate and compare torque standards and measuring equipment. This article introduces the measurement method for accurate determining the working length of the arm in a torque standard machine, and to contribute to improving the accuracy of the torque standard machines.
Keywords
arm length, torque standard, uncertainty of torque standard
Article Details
References
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[2]. New Way Precision Instruction "Air bearing - Application and Design", 2003.
[3]. Diedert Peschel, Dietmar Mauersberger, Physikalisch-Technische Bundesanstalt, Braunschweig, Germany “Determination of the friction of aerostatic radial bearings for the lever-mass system of torque standard machines” XIII IMEKO WORLD CONGRESS, Torino, Italy, September 5 - 9, 1994.
[4]. Drik Roske, “Some problems concerning the level arm length in torque metrology”, PII:S0263-2241(97)00006-7, Measurement Vol.20, No. 1, pp. 23-32, 1997, Elsevier.
[5]. Stigler, Stephen M., The History of Statistics: The Measurement of Uncertainty Before 1900. Cambridge, MA: Belknap Press of Harvard University Press. ISBN 0-674-40340-1, 1986.
[6]. OIML R111-1:2004 “Weights of classes E1, E2, F1, F2, M1, M1-2, M2, M2-3 and M3. Part 1: Metrological and technical requirements”.
[7]. OMRON, User’s manual, smart sensors, Laser type ZX-L-N series.