MN·m torque calibration for nacelle test benches using transfer standards

Schlegel, Christian; Kahmann, Holger; Kumme, Rolf

doi:10.21014/acta_imeko.v5i4.414

Cited by 14 publications

(9 citation statements)

References 1 publication

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“…The main outcome is the test of a torque calibration of an NTB. A 5 MN•m TTS with multi-component capabilities was calibrated up to 1.1 MN•m [19], and an extrapolation to 5 MN•m was applied [20]. This TTS was then installed in the 4 MW NTB at the CWD Aachen, Germany.…”

Section: Discussionmentioning

confidence: 99%

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

Foyer¹,

Kock²,

Weidinger³

2019

ACTA IMEKO

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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.

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Section: Discussionmentioning

confidence: 99%

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

Foyer¹,

Kock²,

Weidinger³

2019

ACTA IMEKO

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“…Thus, the method of estimating the standard uncertainty of type B based on the additive and multiplicative components of the error is reduced to calculation of the dispersion according to formulas (13) or (17).…”

Section: Evaluation Of Uncertainty On the Basis Of Additive And Multimentioning

confidence: 99%

“…As has been demonstrated in the relevant literature [4][5][6][7][8][9][10][11][12][13][14], the basic characteristics of MM include sensitivity, additive errors, multiplicative errors, measurement ranges, and primary and secondary errors (uncertainties) in the MM which in international scientific metrology practice is sometimes known as the Measurand Model. These characteristics are sufficient to establish standards for the accuracy of the MM [11,12].…”

Section: Introductionmentioning

confidence: 99%

Metrological characteristics of the torque measurement of electric motors

Vasilevskyi¹

2017

Int. J. Metrol. Qual. Eng.

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Abstract. This paper proposes a method of determination of the basic metrological characteristics of measurement means (MM) in order to measure the torque of electric motors (EM), such as sensitivity, nominal conversion functions, and additive and multiplicative errors. The nature of change of metrological characteristics was researched using the Measurand Model derived, in the conversion measuring range studied in this paper. Summarised values for additive and multiplicative errors were established for the MM of torque, under the conditions of deviation in terms of the impact value from its nominal value. In addition, the methodology was analysed to enable recalculation of additive and multiplicative errors related to the standard uncertainty of type B. This was undertaken to establish the quality of measurement according to international standards. The research was founded on Measurand Model obtained for multiplicative and additive components in the errors inherent in torque MM.

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“…For newer wind turbines with high rated power, the rated torque can be close to 10 MN

\cdot

m, while the extreme torque is even higher. A calibration traceable to a national or international standard at this level is not possible at present, since the largest such calibration capacity available anywhere in the world is only 1.1 MN

\cdot

m, which is owned by the German national metrology institute PTB in Braunschweig. The governing calibration standard is the German DIN 51309 standard .…”

Section: Introductionmentioning

confidence: 99%

Proposals for a practical calibration method for mechanical torque measurement on the wind turbine drive train under test on a test bench

et al. 2020

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The mechanical torque input into the wind turbine drive train is a very useful measurement for tests performed on a test bench. To ensure the accuracy and the reliability, an accurate calibration of the torque measurement must be carried out and repeated within a certain period of time. However, owing to the high torque level and large structure size, such a calibration is both expensive and time consuming. To overcome this challenge, a new calibration method is proposed here. The method is based on the electrical power measurement, where a high level of accuracy is much easier to achieve. With the help of a special test process, a relationship between the torque‐measuring signal and the electrical power can be established. The process comprises two tests with the drive train running in different operating modes. The calibration is possible by carrying out the same test process on several different torque levels. Detailed uncertainty analysis of the method is presented, whereby the uncertainty can be calculated by means of matrix operation and also numerically. As a demonstration, the implementation of the method on a test bench drive train that contains two 5‐MW motors in tandem with the motors operating in a back‐to‐back configuration is also presented. Finally, some variations on the method and possible ways of achieving better accuracy are discussed.

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MN·m torque calibration for nacelle test benches using transfer standards

Cited by 14 publications

References 1 publication

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

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

Metrological characteristics of the torque measurement of electric motors

Proposals for a practical calibration method for mechanical torque measurement on the wind turbine drive train under test on a test bench

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