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Page 6 of 888 Results 51 - 60 of 8878

J. Matosse, S. Dlamini, M. Sibisi, R. S. Oliveira, S. P. de Oliveira, J. T. Filho
TORQUE BILATERAL COMPARISON BETWEEN NMISA AND INMETRO

This paper presents the results of a bilateral comparison in torque measurements between NMISA in South Africa and INMETRO in Brazil. For this comparison, NMISA used a 20 kN·m torque comparator machine with a proposed uncertainty of 0.03 % (k = 2) across the entire measuring range. INMETRO used a 3 kN·m lever deadweight standard machine with uncertainty of 0.01 %. The comparison was conducted for both clockwise and counter-clockwise directions. Comparison analysis considered measurement data in the range of 200 N·m to 1 000 N·m. The maximum relative deviation observed for the bilateral is 2 × 10-4 in both directions.

Sun Qinmi, Li Haibin, Li Xuefei
DERIVATION AND DETERMINATION ANALYSIS OF THE MASS OF STEEL ANVIL USED FOR VERIFYING REBOUND TEST HAMMER

This paper describes the derivation process of steel anvil mass. According to the law of conservation of energy, through the analysis and calculation of impact dynamics in the impact verification process of rebound test hammer, the source of technical indicators of steel anvil for rebound test hammer is pointed out. According to the derivation, the mass of steel anvil is calculated to be 16.1 kg, which is consistent with the mass of steel anvil actually used. The scientific traceability is verified theoretically and practically. It is convenient for the measurement of the relevant indexes of the rebound instrument and the manufacture and use of the standard steel anvil.

Wenjun He, Kun Ma, Kai Zhang, Shucheng Wang, Ping Liu
INVESTIGATING TYPE EVALUATION OF WEIGHING INDICATORS BASED ON DIGITAL LOAD CELL SIMULATOR

The paper describes the difference in the standards of measurement for weighing indicator. A digital load cell simulator with high resolution for type evaluation of weighing indicators was developed and its traceable calibration was also presented by DC voltage ratio method using a 7.5 digit multimeter with dual channel. The type evaluation method of weighing indicator was investigated and the performance test effect on the indication error was also discussed.

N. Rogge, O. Dannberg, M. Kühnel, T. Fröhlich
A NOVEL EMFC TILTMETER WITH EXTENDED MEASUREMENT RANGE

This work presents a new tiltmeter that utilises the principle of electromagnetic force compensation (EMFC) in order to increase its measurement range and measurement dynamics compared to an uncompensated pendulum tiltmeter. The development included investigations on the design of the pendulum mechanics, the position sensor and the actuators. With the chosen parameters a resolution of 1 µrad in a measurement range of 20 mrad can be achieved currently on a short-term timescale.

Xu Yinjie, Tang Yun, Huang Weijun, Zhao Xinghua
THE DEVELOPMENT OF DEADWEIGHT FORCE STANDARD MACHINE OF 500 kN WITH WEIGHT EXCHANGE CONTROL SYSTEM

Based on the “force standard machine weights exchange method and weights exchange device” patent technology, a deadweight force standard machine (DWM) of 500 kN was developed. Benefited by the weights exchange control system with eight weights and load frame,this machine can load/unload any load level equally with the minimum increment of 10 kN, in 10 kN to 500 kN range,and the load history curve is basically the same. Eliminating the counter-force phenomenon in traditional DWM, it meets the technical requirements of OIML R 60 international recommendations for loading equipment.

R. S. Oliveira, P. Weidinger, Z. Song, L. Vavrečka, J. Fidelus, T. Kananen, S. Kilponen
TRANSDUCER RESPONSE UNDER NON-STANDARDISED TORQUE LOAD PROFILES

In nacelle system test benches, different wind profiles are simulated by applying different torque loads and rotational speeds amongst other things. Unlike load sequences during calibration measurements, these profiles are neither constant nor increasing and decreasing through controlled steps. This article proposes a sequence of partial range and shuffled torque load tests that combine torque rates and filter settings to evaluate parameters affecting the measurement results, such as output sensitivity, linearity, and hysteresis.

V. Cherkasova, T. Fröhlich
CAPACITIVE CALIBRATION CAPABILITIES IN AN EMFC BALANCE

The article describes the possibilities of calibrating the force constant in an electromagnetic force compensation (EMFC) load cell using the electrostatic force compensation principle. The static and dynamic principles of calibration of the Kibble balance for the electrostatic force constant, as well as calibration by means of compensation of the electrostatic force by the electromagnetic force, are considered. The combination of the two compensation principles in the load cell allows the measurement of forces in the range of 20 pN to 2.2 mN and ensures traceability to national standards. The relative uncertainty in the measurement of forces of about 100 nN is estimated to be about 0.001.

Shen Dongbin, Ma Kun, Liu Ping, Wang Lianfang,Zhang Shuai, Ma Binghui
RESEARCH ON TEST METHOD OF ABNORMAL PASS BEHAVIOUR OFAUTOMATIC INSTRUMENTS FOR WEIGHING ROAD VEHICLES IN MOTION

This paper introduces common abnormal pass behaviour of automatic instruments for weighing road vehicles in motion (WIM) and gives the corresponding test method. Common abnormal behaviour of WIM includes “S-line” driving, “static and dynamic” driving, “line pressing” driving, and “cross road” driving.

S. Hassan, D. Howorek, D. Peschel
GUIDE TO THE CALIBRATION OF HYDRAULIC TORQUE WRENCHES

This paper describes the new proposal of the calibration of hydraulic torque wrenches. The calibration includes the different metrological effects of the hydraulic torque wrenches like repeatability, reproducibility, and the piston position. A sensitivity analysis is introduced to the different uncertainty contributions of the of hydraulic torque wrenches like the piston position, mounting position and the mechanical adaptation. The measurements show that the piston position has the significant influence on the measurement uncertainty of the calibration result. The uncertainty evaluation of the calibration facility is introduced including the effect of the lateral forces that comes from the application of relatively high torque values with short lever arm lengths. The estimation of the measurement results and the corresponding uncertainty are performed like the calibration standard ISO DIN 51309 without the estimation of the hysteresis. The calibration method and the corresponding validation are accepted from the German DAkkS accreditation body.

R. C. Mayworm, E. Webster, S. Davidson, A. V. Alvarenga, R. P. B. Costa-Felix
DEVELOPING A KIBBLE BALANCE FOR MEASURING ULTRASONIC RADIATION FORCE AT 1 MEGAHERTZ

Various approaches to bench-top Kibble balances are available worldwide. However, the literature has not disclosed a Kibble balance to measure ultrasonic radiation force (URF). Due to the nature of Kibble balances, assessing URF could be useful and even more valuable. This paper describes the development of a bench-top Kibble balance to measure URF. The system was compared to the Brazilian National Metrology Institute's primary standard for ultrasonic power measurement. Regarding the regular microbalance used for that purpose, the Kibble balance approach led to a smaller uncertainty in the 10 W to 20 W range.

Page 6 of 888 Results 51 - 60 of 8878