Abstract
This contribution investigates the effect of marine growth and damage severity on the modal parameters of a scaled experimental model of a monopile used in supporting offshore wind turbines. A quick glimpse of the literature review reveals that this topic has not been well investigated as the majority of previous research focuses on the effect of marine growth on the hydrodynamic loads transferred to the test structure, with little focus on its effect on the modal parameters of a structure. Nevertheless, from a monitoring standpoint, it is important to differentiate between the effect of marine growth and damage on the modal parameters, especially when these parameters are used as damage indicators, further improving existing structural health monitoring techniques in determining if the changes observed in modal parameters are caused by actual damage rather than the growth of marine organisms with time. The results provided in this contribution provide differences between the effect of marine growth and damage, which is recommended to be included in current monitoring techniques. Furthermore, a recommendation to investigate the effect of damage on damping and, possibly, the potential of using changes in damping characteristics as damage indicators is also made.
Highlights
Encouraged by the energy crisis and the global effort to reduce greenhouse gas emissions, renewable energy, especially wind and solar energy, have experienced rapid developments in the last three decades [1]
The presented research investigates the effect of marine growth and damage on the modal characteristics of a scaled laboratory model of a monopile supporting structure used in offshore wind turbines
Not much literature exists that covers the topic, since the majority of previous research focuses on the effect of marine growth on the hydrodynamic loads transferred to the test structure
Summary
Encouraged by the energy crisis and the global effort to reduce greenhouse gas emissions, renewable energy, especially wind and solar energy, have experienced rapid developments in the last three decades [1]. Structural Health Monitoring (SHM) techniques have been developed to track the current “health” of a structure and provide early warnings in case of damage detection [2]. In this context, damage is defined as any change in modal parameters that adversely affect the performance of the structure [3]. Vibration-based SHM techniques are used in detecting damages mainly by monitoring the changes in modal parameters such as frequencies and mode shapes
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