Novel torque sensor design and enhanced envelope method of acoustic emission signals in condition monitoring of the nacelle in wind turbines

Victor Kalinin, Alexander Stopps, Juan Ferrando Chacon, Estefania Artigao, Vassilios Kappatos, Cem Selcuk, Tat Hean Gan, Denja Lekou, Alvaro Garcia Ruiz

Publikation: Kapitel i bog/rapport/konference-proceedingKonferencebidrag i proceedingsForskningpeer review

Abstrakt

The gearbox of a wind turbine experiences complex loading patterns due to the high variability of the wind and other transient events, resulting in high wear and tear leading to costly failure. In the past, condition monitoring (CM) has relied upon vibration, oil analysis and temperature monitoring. These techniques have been extensively used with some success; however they can only monitor faults at a very late stage. This paper presents a detailed design and study of Surface Acoustic Wave (SAW) Torque sensors and the use of the Acoustic emission (AE) technique to monitor faults in the wind turbine drivetrain. A novel design to overcome inherent problems of SAW torque sensor use with large wind turbines is presented. Slow rotational speeds, make CM difficult due to the reduced energy loss rates, whereby the signal to noise (S/R) ratio is low. This makes defect detection using AE difficult or even impossible. However, we show here that with the use of the 'Envelope' technique, the use of AE is viable. AE technique was used to monitor the main bearing and gearbox bearings. Several features were extracted from the time domain AE signal and envelope analysis was applied to the AE signal to find periodical patterns produced by faults such as bearing defects or misalignment. In this work, AE and Torque techniques were evaluated in the laboratory and with reallife testing on the NEG MICON 750 wind turbine located at CRES (Greece).

OriginalsprogEngelsk
TitelProceeding of the 11th International Conference on Condition Monitoring and Machinery Failure Prevention Technologies, CM 2014 / MFPT 2014
ForlagBritish Institute of Non-Destructive Testing
Publikationsdato2014
StatusUdgivet - 2014
Udgivet eksterntJa
Begivenhed11th International Conference on Condition Monitoring and Machinery Failure Prevention Technologies, CM 2014 / MFPT 2014 - Manchester, Storbritannien
Varighed: 10. jun. 201412. jun. 2014

Konference

Konference11th International Conference on Condition Monitoring and Machinery Failure Prevention Technologies, CM 2014 / MFPT 2014
LandStorbritannien
ByManchester
Periode10/06/201412/06/2014
SponsorAshtead Technology, AVT Reliability, Reliability Maintenance Solutions Ltd (RMS), SpectraQuest, Inc. (SQI)

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