Journal
STRUCTURAL CONTROL & HEALTH MONITORING
Volume 29, Issue 1, Pages -Publisher
JOHN WILEY & SONS LTD
DOI: 10.1002/stc.2863
Keywords
fatigue damage accumulation; fatigue maps; input-state estimation; multiaxial loading; virtual sensing; wind turbine
Funding
- Hong Kong Research Grants Council [16234816, 16211019]
- Mexican National Council of Science and Technology CONACYT
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This paper proposes a framework for monitoring fatigue in linear components of a structure using limited vibration data, estimating dynamic responses through virtual sensing techniques and computing fatigue damage. The approach allows for realistic fatigue damage information based on actual operational conditions.
This paper presents a framework for fatigue monitoring on linear components of a structure subjected to unknown loads using a limited number of output-only vibration measurements. It exploits virtual sensing techniques to estimate the dynamical responses, including virtual multiaxial strain/stress time histories. It applies joint input-state estimation algorithms to predict the dynamical response of the structural components. The resulting virtual multiaxial stress histories are used to compute the fatigue load cycles and corresponding fatigue damage. The proposed streamline approach allows the use of different available methodologies for virtual sensing and multiaxial fatigue analysis. A numerical validation example is provided using the tower of a reference wind turbine model subject to realistic wind loads. The proposed procedure can be adopted over a monitoring period to produce a global fatigue damage accumulation map from limited vibration data. It thus provides realistic fatigue damage accumulation information for a component based on the actual operational conditions of a structure.
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