Evaluation of Measurement Uncertainty for Torque Standard Machine Using Air Rotary Bearing

2017 ◽  
Vol 870 ◽  
pp. 215-222
Author(s):  
Vu Van Duy ◽  
Vu Toan Thang ◽  
Pham Van Hung
Keyword(s):  
Measurement Uncertainty ◽  
Science And Technology ◽  
Friction Torque ◽  
Torque Measurement ◽  
Industrial Areas ◽  
Calibration Process ◽  
Vibration Load ◽  
Great Demand ◽  
Measurement Devices ◽  
Axial Tilt

Calibration for torque measurement devices has become a great demand in many industrial areas. The most important in a calibration process is decreasing its uncertainty. This paper presents in building formula to evaluate the measurement uncertainty for torque standard machine using air rotary bearing which is experimented at the Hanoi University of Science and Technology. The uncertainty of the device is composed of the uncertainty of the component elements such as arm length, load, friction torque, axial tilt, vibration load...etc. Based on them the formula is built to estimate the measurement uncertainty of torque standard machine, find out factors that affect most to the measurement uncertainty value, therefore it can benefit the further researches to improve the accuracy of the torque standard machine.

Friction Torque Measurement in Partial Hybrid S-C Angular Contact Ball Bearings

2014 ◽  
Vol 658 ◽  
pp. 339-344
Author(s):  
Viorel Paleu ◽  
Ioan Damian ◽  
Cristel Stirbu
Keyword(s):  
Silicon Nitride ◽  
High Speed ◽  
Equilibrium Temperature ◽  
Friction Torque ◽  
Ball Bearings ◽  
Self Healing ◽  
Testing Device ◽  
Torque Measurement ◽  
Steel Balls ◽  
Partial Hybrid

To monitor the friction torque evolution in tandems of angular contact ball bearings, a new testing device is developed. New partial hybrid bearings from 7206C series are obtained by combining 8 steel balls with 4 silicon nitride balls of the same diameter equally spaced in the cage, these bearings being denoted hereafter as 8S-4C type. For comparison, tests are carried-out also on conventional all-steel bearings and hybrid bearings with all the steel balls replaced by silicon nitride balls. The equilibrium temperature of the all-steel, hybrid and 8S-4C ball bearings is determined by tests. At high speed and light axial load, the 8S-4C ball bearings withstand to an oil shut-off test of one minute, while the similar all-steel bearings seized. The 8S-4C partial hybrid ball bearings can be an advantageous solution comparative to more expensive all hybrid bearings, avoiding the scuffing due to the self-healing effect induced by the higher hardness of the silicon nitride balls.

scholarly journals Influences on torque measurement in nacelle test benches and their effect on the measurement uncertainty and consequences of a torque calibration

ACTA IMEKO ◽  
2019 ◽  
Vol 8 (3) ◽  
pp. 59 ◽  
Author(s):  
Gisa Foyer ◽  
Stefan Kock ◽  
Paula Weidinger
Keyword(s):  
Measurement Uncertainty ◽  
Calibration Procedure ◽  
Measurement Methods ◽  
Torque Measurement ◽  
Direct Measurements ◽  
Drive Trains ◽  
The Moment ◽  
Efficiency Determination ◽  
Turbine Drive

Torque measurement in the MN·m range is important in nacelle test benches, as it constitutes the primary value for the efficiency determination of wind turbine drive trains. However, no traceable measurement is possible above 1.1 MN·m. At the moment, alternatives to direct torque measurement in the MN·m range are, therefore, used. Several of these torque measurement methods are presented and discussed in this paper with respect to traceability and measurement uncertainty. It was found that these methods cannot fully substitute direct measurements. Therefore, detailed recommendations for a torque calibration procedure based on the specific conditions in nacelle test benches (such as rotation and additional mechanical loads) are given so as to enable the traceability of torque measurement using a torque transfer standard.

scholarly journals Calibration of torque measurement under constant rotation in a wind turbine test bench

2019 ◽  
Vol 8 (1) ◽  
pp. 149-159 ◽  
Author(s):  
Paula Weidinger ◽  
Gisa Foyer ◽  
Stefan Kock ◽  
Jonas Gnauert ◽  
Rolf Kumme
Keyword(s):  
Measurement Uncertainty ◽  
Wind Turbine ◽  
Wind Turbines ◽  
Test Bench ◽  
Calibration Procedure ◽  
National Standards ◽  
Torque Measurement ◽  
Transfer Standard ◽  
Calibration Result ◽  
Better Than

Abstract. To determine the efficiency of multi-MW wind turbines, the torque measurement in wind turbine test benches has to be performed with an accuracy better than 0.2 %. To this end, the torque measurement has to be traced to national standards in the MN m range. This can be done by using a novel torque transfer standard in combination with a newly developed torque calibration procedure under constant rotation, which are both presented and discussed in this paper. The calibration procedure was performed on a 4 MW wind turbine test bench and the evaluation of the calibration result, including a measurement uncertainty, is explained in detail.

scholarly journals Measurement of thermometer using automated system

2018 ◽  
Vol 7 (2.8) ◽  
pp. 307
Author(s):  
S Pradeep Kumar ◽  
N Shanmugasundaram ◽  
E N. Ganesh
Keyword(s):  
Measurement Uncertainty ◽  
Temperature Stability ◽  
Automated System ◽  
Short Term ◽  
Calibration Process ◽  
Laboratory Assistant ◽  
Subsequent Calculation ◽  
Multiple Measurements ◽  
Thermometer Calibration ◽  
Calibration Parameters

Calibration of thermometers is time- consuming process that requires short-term temperature stability during multiple measurements at given temperature points. In most laboratories, thermometer calibration process is not automated, requiring the presence of the laboratory assistant during the calibration and for the subsequent calculation of the measurement uncertainty. In this paper, an automated system for calibration of thermometers is presented. The system enables the entire calibration process to be computer driven, after setting calibration parameters. The details are presented on an example of a furnace for temperatures up to 1 000 ° C. The review of the metrology software is given

Friction Torque Measurement and Analysis of Influence Factors on Engine Valvetrain

2014 ◽  
Author(s):  
Evandro de Almeida Leme ◽  
Alfons R. Wagner ◽  
Anderson Gutierres ◽  
Gilson Santos ◽  
Henrico Gouvea da Silva
Keyword(s):  
Influence Factors ◽  
Friction Torque ◽  
Torque Measurement ◽  
Measurement And Analysis

Variation Analysis of Starting Friction Torque of Blade Bearing for Wind Turbine

2011 ◽  
Vol 230-232 ◽  
pp. 685-689
Author(s):  
Xin Tao Xia ◽  
Jing Liu ◽  
Long Chen
Keyword(s):  
Nonlinear Evolution ◽  
Friction Torque ◽  
Variation Coefficient ◽  
Torque Measurement ◽  
Variation Analysis ◽  
Simulation Experiments ◽  
Sample Mean ◽  
Evolution Characteristics ◽  
Overturning Moment ◽  
New Discovery

By simulation experiments, the relation between the starting friction torque of a blade bearing and the overturning moment is explored in order to disclose the nonlinear evolution characteristics of the sample mean and variation coefficient of the starting friction torque. Via the variation analysis of the test data, the result indicates that with the rise of the overturning moment, the sample mean is nonlinearly increased and the sample variation coefficient is nonlinearly decreased in view of the overall situation, at which there is a sensitive spot where the sample variation coefficient makes larger abnormally. This is a new discovery. Perhaps it can lay the foundation for analyzing the starting friction torque measurement system and for designing the blade bearing system.

scholarly journals Validation of a 1:8 Scale Measurement Stand for Testing Airborne Sound Insulation

Sensors ◽  
2021 ◽  
Vol 21 (19) ◽  
pp. 6663
Author(s):  
Agata Szeląg ◽  
Katarzyna Baruch-Mazur ◽  
Krzysztof Brawata ◽  
Bartosz Przysucha ◽  
Dominik Mleczko
Keyword(s):  
Measurement Uncertainty ◽  
Science And Technology ◽  
Full Scale ◽  
Sound Insulation ◽  
Small Scale ◽  
Full Size ◽  
Testing Methodology ◽  
Airborne Sound ◽  
Uncertainty Of Measurements

This paper contains a detailed description of the design and validation of a measurement stand for testing the airborne sound insulation of specimens made at a small scale. The stand is comprised of two coupled reverberation rooms in which the geometry represents the full-size reverberation rooms used at the AGH University of Science and Technology at a 1:8 scale. The paper proves that both the scaled measurement stand and the testing methodology conform to the ISO 10140 standards, and that the obtained measurement uncertainty does not exceed the maximum values specified in ISO 12999-1. Moreover, the calculated uncertainty of measurements obtained for the 1:8 scale stand is comparable with the typical uncertainty given in ISO 12999-1 and the uncertainty obtained on the full-scale measurement stand. In connection with the above, the authors have proved that by using the scaled-down measurement stands, one can obtain reliable and repeatable results of measurements of airborne sound insulation.

scholarly journals Concept and setup of a multi-component facility for force and torque in the range of 1 MN and 2 kN·m

ACTA IMEKO ◽  
2014 ◽  
Vol 3 (2) ◽  
pp. 39
Author(s):  
Sebastian Baumgarten ◽  
Dirk Röske ◽  
Holger Kahmann ◽  
Dietmar Mauersberger ◽  
Rolf Kumme
Keyword(s):  
Friction Coefficient ◽  
Measurement Uncertainty ◽  
Friction Torque ◽  
Measuring Range ◽  
Tightening Torque ◽  
Prestressing Force ◽  
Measuring Facility ◽  
Better Than

This article describes the design of a measuring facility which can be used to investigate and calibrate so-called "friction coefficient sensors". These measuring facilities are used to measure the prestressing force and the tightening torque, resp. the friction torque of screws. These measurements are aimed at optimizing screw joints. The measuring facility described here is part of a force standard machine (fsm). In addition to the force which this system can realize with a very small measurement uncertainty of 0.002 % (<em>k</em> = 2) (in the measuring range from 20 kN to 1 MN), it can also generate an extremely precise torque (objective: better than 0.005 % at <em>k</em> = 2) in the range from 20 N·m to 2 kN·m.

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