A Two-Step Approach to Damage Localization at Supporting Structures of Offshore Wind Turbines

This article introduces a new adaptive two-step optimization algorithm for finite element model updating with special emphasis on damage localization at supporting structures of offshore wind turbines. The algorithm comprises an enhanced version of the global optimization algorithm simulated annealing, the simulated quenching method that approximates an initial guess of damage localization. Subsequently, sequential quadratic programming is used to compute the final solution adaptively. For the correlation of numerical model and measurement data, both a measure based on eigenfrequencies and mode shapes and a measure employing time series are implemented and compared with respect to their performance for damage localization. Phase balance of the time signals is achieved using cross-correlation. The localization problem is stated as a minimization problem in which the measures are used in time and modal domain as the objective function subject to constraints. Furthermore, the objective function value of the adjusted model is used to distinguish correct from wrong solutions. The functionality is proven using a numerical model of a monopile structure with simulated damage and a lab-scaled model of a tripile structure with real damage.

• Record URL:
  • https://doi.org/10.1177/1475921717741083
• Availability:
  • Find a library where document is available. Order URL: http://worldcat.org/issn/14759217
• Supplemental Notes:
  • © 2017 Karsten Schröder et al.
• Authors:
  • Schröder, Karsten
  • Gebhardt, Cristian Guillermo
  • Rolfes, Raimund
• Publication Date: 2018-9

Language

• English

Media Info

• Media Type: Web
• Features: References;
• Pagination: pp 1313-1330
• Serial:
  • Structural Health Monitoring
  • Volume: 17
  • Issue Number: 5
  • Publisher: Sage Publications, Incorporated
  • ISSN: 1475-9217
  • EISSN: 1741-3168
  • Serial URL: http://shm.sagepub.com/

Subject/Index Terms

• TRT Terms: Finite element method; Mathematical models; Offshore power plants; Structural deterioration and defects; Structural supports; Turbines
• Uncontrolled Terms: Damage localization; Offshore wind turbines
• Subject Areas: Maintenance and Preservation; Marine Transportation; Terminals and Facilities;

Filing Info

• Accession Number: 01712636
• Record Type: Publication
• Files: TRIS
• Created Date: Jul 26 2019 11:53AM