597_ewea2015presentation.pdf (454.28 kB)
Detecting critical scour developments at monopile foundations under operating conditions
conference contribution
posted on 2016-04-22, 11:28 authored by Jannis Weinert, Ursula Smolka, Bjorn Schumann, Po Wen ChenEarly warning systems for critical conditions at offshore wind turbines are needed to reduce maintenance costs and avoid catastrophic failures. Monitoring of the critical scour development at monopile foundations is commonly done with cost-intensive scour depth measurements. The scour condition is regarded critical when the depth exceeds the maximum allowed design scour depth during normal operation or due to a severe storm. This practice can lead to high maintenance costs and potentially unnecessary maintenance activities such as refilling of the scour hole or reconstruction of the scour protection. Instead, the exploitation of the structural reserves of fatigue driven monopile foundation designs stemming from design assumption versus real site conditions is suggested. Damage accumulation is highly influenced by the time behaviour of the transient scouring and real soil properties. This paper elaborates on novel low cost monitoring methods to detect when a scour development is truly critical when taking site conditions into account. A combination of fatigue monitoring and natural frequency supervision is proposed for critical scour identification in the framework of an early warning system.
Funding
This paper is part of student research at Rambøll in the scope of a master’s thesis in cooperation with Stuttgart Wind Energy, University of Stuttgart.
History
School
- Mechanical, Electrical and Manufacturing Engineering
Published in
European Wind Energy Association Annual Event EWEA 2015 Scientific ProceedingsPages
135 - 139Citation
WEINERT, J. ... et al, 2015. Detecting critical scour developments at monopile foundations under operating conditions. IN: Proceedings of the European Wind Energy Association Annual Event, EWEA 2015, Scientific Proceedings, 17th-20th November 2015, Paris, France, pp. 135 - 139.Publisher
European Wind Energy AssociationVersion
- VoR (Version of Record)
Publisher statement
This work is made available according to the conditions of the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International (CC BY-NC-ND 4.0) licence. Full details of this licence are available at: https://creativecommons.org/licenses/by-nc-nd/4.0/Acceptance date
2015-07-07Publication date
2015Notes
This is a conference paper.ISBN
9782930670003Publisher version
Language
- en