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Bài viết giới thiệu phương pháp do đùng để xác định chính xác chiều dài làm việc của cánh tay đòn của máy chuẩn mô men dùng ổ khí quay, góp phần đánh giá nâng cao độ chính xác của các máy chuẩn mô men. | 054-057 1 2 3 1 2 3 -01- -02-2017 chính xác T . 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 the 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 adjust lower 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 054-057 2 1 054-057 2 1 ct1 1 1 1 1 2 3 ct2 2 0 2 1 1 3 1 0 1 0 0 ct1 2 1 1 3 ct2 2 2 1 2 1 ct1 1 1 1 1 2 ct2 2 ct1 1 1 1 1 2 ct2 2 2. 2 o 1 0 3 0 1 2 0 3 1. 2 1 2 1 ct1 1 1 1 1 2 3 ct2 2 054-057 -6 L1 -5 -5 1 1 L1 -6 1 . Koji OHGUSHI Takashi OTA Kazunaga UEDA and Design and Development of 20 kN.m Deadweight Torque Standard Machine National Institute of Advanced Industrial Science and Technology. 2 . New Way Precision Instruction quot Air bearing - Application and Design quot 2003. 3 . Diedert Peschel Dietmar Mauersberger Physikalisch-Technische Bundesanstalt friction of aerostatic radial bearings for the lever- mass system of torque standard IMEKO WORLD CONGRESS Torino Italy September 5 - 9 1994. -6 4 . -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 quot Weights of classes E1 E2 F1 F2 M1 M1-2 M2 M2-3 and M3. Part 1 Metrological and technical requirements quot . 7 . ZX-L-N series. 1 6 6 uL1
