Risk-based Comparative Study of Fluid Power Pitch Concepts

Research output: Contribution to book/anthology/report/conference proceedingArticle in proceedingResearchpeer-review

2 Citations (Scopus)

Abstract

Proper functioning of the pitch system is essential to both normal operation and safety critical shut down of modern multi megawatt wind turbines. Several studies on field failure rates for such turbines show that pitch systems are a major contributor to failures which entails an increased risk. Thus, more reliable and safe concepts are needed. A review of patents and patent applications covering fluid power pitch concepts, reveals that many propose closed-type hydraulic systems. This paper proposes a closed-type concept with a bootstrap reservoir. In contrary to a conventional system where a common supply delivers to cylinder drives mounted at each blade, the concept using bootstraps are fully contained in the rotating hub and act as standalone actuators. Clear advantages of such systems are a reduction of high pressure leakage paths, but in turn more components are used for each supply circuit. To allow for comparison, this paper deals with a risk-based analysis of these two types of pitch concepts. The risk-based analysis is conducted according to a qualitative failure analysis method which is verified against recent field failure data for hydraulic pitch systems. The method combines Fault Tree Analysis and Failure Mode and Effect Criticality Analysis in a systematic framework that lowers the bias issues normally encountered for qualitative studies. Under the assumption of similar components, the results indicate an equal risk of the two concepts. A decreased reliability is seen for the bootstrap concept due to additional components in the supply circuit compared to the conventional system. It is noted that careful selection of high reliable pumps and relief valves may significantly reduce risk and increase reliability of the bootstrap concept.
Original languageEnglish
Title of host publicationProceedings of ASME/BATH 2017 Symposium on Fluid Power & Motion Control
Number of pages9
PublisherAmerican Society of Mechanical Engineers
Publication dateOct 2017
ISBN (Electronic)978-0-7918-5833-2
DOIs
Publication statusPublished - Oct 2017
EventASME/BATH 2017 Symposium on Fluid Power & Motion Control - Lido Beach Resport, Sarasota, United States
Duration: 16 Oct 201719 Oct 2017
http://www.asmeconferences.org/FPMC2017/

Conference

ConferenceASME/BATH 2017 Symposium on Fluid Power & Motion Control
LocationLido Beach Resport
CountryUnited States
CitySarasota
Period16/10/201719/10/2017
Internet address

Fingerprint

Fluids
Hydraulics
Pressure relief valves
Fault tree analysis
Networks (circuits)
Wind turbines
Failure modes
Failure analysis
Turbines
Actuators
Pumps

Cite this

Liniger, J., Pedersen, H. C., & N. Soltani, M. (2017). Risk-based Comparative Study of Fluid Power Pitch Concepts. In Proceedings of ASME/BATH 2017 Symposium on Fluid Power & Motion Control American Society of Mechanical Engineers. https://doi.org/10.1115/FPMC2017-4222
Liniger, Jesper ; Pedersen, Henrik Clemmensen ; N. Soltani, Mohsen. / Risk-based Comparative Study of Fluid Power Pitch Concepts. Proceedings of ASME/BATH 2017 Symposium on Fluid Power & Motion Control. American Society of Mechanical Engineers, 2017.
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Liniger, J, Pedersen, HC & N. Soltani, M 2017, Risk-based Comparative Study of Fluid Power Pitch Concepts. in Proceedings of ASME/BATH 2017 Symposium on Fluid Power & Motion Control. American Society of Mechanical Engineers, Sarasota, United States, 16/10/2017. https://doi.org/10.1115/FPMC2017-4222

Risk-based Comparative Study of Fluid Power Pitch Concepts. / Liniger, Jesper; Pedersen, Henrik Clemmensen; N. Soltani, Mohsen.

Proceedings of ASME/BATH 2017 Symposium on Fluid Power & Motion Control. American Society of Mechanical Engineers, 2017.

Research output: Contribution to book/anthology/report/conference proceedingArticle in proceedingResearchpeer-review

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Liniger J, Pedersen HC, N. Soltani M. Risk-based Comparative Study of Fluid Power Pitch Concepts. In Proceedings of ASME/BATH 2017 Symposium on Fluid Power & Motion Control. American Society of Mechanical Engineers. 2017 https://doi.org/10.1115/FPMC2017-4222