Feasibility for Damage Identification in Offshore Wind Jacket Structures through Monitoring of Global Structural Dynamics
| Autor: | Ursula Smolka, Athanasios Kolios, Mark Richmond |
|---|---|
| Rok vydání: | 2020 |
| Předmět: |
Control and Optimization
Computer science 020209 energy Modal analysis Energy Engineering and Power Technology 020101 civil engineering mode shapes 02 engineering and technology lcsh:Technology Turbine damage identification 0201 civil engineering 0202 electrical engineering electronic engineering information engineering Sensitivity (control systems) natural frequencies Electrical and Electronic Engineering Engineering (miscellaneous) finite element model lcsh:T Renewable Energy Sustainability and the Environment business.industry Mode (statistics) Structural engineering Finite element method Offshore wind power Modal offshore wind jacket structure Reduction (mathematics) business TC Energy (miscellaneous) |
| Zdroj: | Energies Volume 13 Issue 21 Pages: 5791 Energies, Vol 13, Iss 5791, p 5791 (2020) |
| ISSN: | 1996-1073 |
| DOI: | 10.3390/en13215791 |
| Popis: | The modal response of a four-legged jacket structure to damages are explored and resulting considerations for damage detection are discussed. A finite element model of the Wikinger (Iberdrola) jacket structure is used to investigate damage detection. Damages, such as cracks, scour, corrosion and more, are modelled in a simulation environment. The resulting modal parameters are calculated, these parameters are compared to those from an unaltered structure and metrics are calculated including frequency change, modal assurance criterion and modal flexibility. A highly detailed design-model is used to conduct a sensitivity study on modal parameters for a range of changes. By conducting this on the same structure, this acts as a useful reference for those interested in the dynamic response of offshore wind jacket structures. Additionally, this paper addresses the issue of changes in mode parameters resulting from turbine yaw. This paper also considers the challenge of mode-swapping in semi-symmetric structures and proposes several approaches for addressing this. Damage typically results in a reduction of frequency and change in mode shapes, but in ways which can be distinguished from other structural changes, given the extent of this model. These findings are important considerations for modal-based damage detection of offshore wind support structures. |
| Databáze: | OpenAIRE |
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