Measurement uncertainty of torque measurements with rotating torque transducers in power test stands

Wegener, Georg; Andrae, J.

doi:10.1016/j.measurement.2006.08.001

Cited by 19 publications

(6 citation statements)

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“…Table 1 provides a comparison of K t values obtained from the calibration test and equation (5). The difference between the two methods is ~3.2%, which is not surprising because of the uncertainties in shaft geometry and material properties assumed in the formula.…”

Section: Probe Configurationmentioning

confidence: 98%

High precision torque measurement on a rotating load coupling for power generation operations

Sue¹,

Wilson²,

Farr³

et al. 2012

2012 IEEE International Instrumentation and Measurement Technology Conference Proceedings

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The unique torque measurement method presented in this paper provides a useful means to assess the power output of a gas turbine and/or a steam turbine in power generation operations. It measures the torque with a high degree of accuracy on a rotating load coupling shaft connecting a driving turbine to a power generator during power plant operations. The measured torque can be used to verify various performance modeling tools based on a heat balance approach. Performance validation aids in reducing conservative benefit margins put onto upgrade packages due to less uncertainty in the simple cycle and combined cycle models. This technique is especially valuable in a combined cycle operation in which the power outputs of a gas turbine and a steam turbine coupled to the same shaft need to be determined separately. Unlike the conventional strain gage technique, this optical method offers a non-contact approach that does not require any embedded sensors or lead wires on the rotating shaft; it rather requires a few discrete targets installed on the shaft, a rigid frame to hold the optical probes steady for signal capturing, and a rotor reference or once per revolution sensor. Torque measurement is achieved by measuring the time arrival of the targets on the rotating shaft and then converting timing data into the angle of twist, which can then be converted to torque using predetermined torsional stiffness obtained from a torque calibration test on the same shaft. This method has been demonstrated in a full-scale gas turbine test, from which the results indicate a good correlation between torque measurement and performance modeling. Additionally, comparative tests involving two independent measurements on the same rig have been carried out in the laboratory and the results provide further evidence that confirms the accuracy and stability of this method.

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Section: Probe Configurationmentioning

confidence: 98%

High precision torque measurement on a rotating load coupling for power generation operations

Sue¹,

Wilson²,

Farr³

et al. 2012

2012 IEEE International Instrumentation and Measurement Technology Conference Proceedings

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show abstract

“…For the highest requirements, they are located in the drive train as rotation transducers. The qualitative analysis of the measurement uncertainty influences on such rotating transducers undertaken by Wegener and Andrea [4] as well as experimental approaches [5] show that the transfer of the findings on non-rotating torque transducers to rotating transducers is a key element in the traceability of systems for the measurement of rotatory power.…”

Section: Retrospectionmentioning

confidence: 99%

A Standard for Rotatory Power Measurement

Brüge

Pfeiffer

2019

ACTA IMEKO

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<p class="Abstract">In Germany, the realisation and dissemination of the unit of rotatory power is a legal task of the national metrology institute aimed at ensuring the safe operation of ergometers for patients. At the Physikalisch-Technische Bundesanstalt, this task is carried out by means of a standard that can be operated both as a regulated brake and as a regulated drive, so that the effective torque and the revolution speed can be measured traceably. In this article, technical details and uncertainty calculations about this standard are given.</p>

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“…and n = t meas ⋅f sample (9) where p is the number of measurement points, tmeas is the duration of each measurement, and fsample is the sampling frequency of the measurement.…”

Section: Static Zero Signalmentioning

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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Measurement uncertainty of torque measurements with rotating torque transducers in power test stands

Cited by 19 publications

References 0 publications

High precision torque measurement on a rotating load coupling for power generation operations

High precision torque measurement on a rotating load coupling for power generation operations

A Standard for Rotatory Power Measurement

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

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