Additional Project Information
This project is collaboration between the following organisations: The University of Newcastle, CMR UK Ltd, Applied Inspection Ltd, TBG solutions Ltd, TWI Ltd and the National Renewable Energy Centre (Narec).
It is part of the 4-project programme:
“Offshore Wind Turbine Fabrication and Condition Monitoring – Knowledge Generation and Transfer to Industry”.
This programme comprises four activities. Three of these involve research and development relating to new technologies and the forth one is technology transfer activity to take the results of these developments, and other related developments, to individual companies:
- novel fabrication methods for wind turbine towers
- the development and automated application of 40 year life coatings for wind turbine structures
- systems and methodologies for condition monitoring of wind turbine towers and blades
- technology transfer
This project will produce an advanced system for condition monitoring of wind turbine towers and blades utilising two techniques, specifically designed for wind turbines and their components:
- The Acoustic Emission (AE) technique for condition monitoring is an active area of research primarily due to the requirement for complex signal processing to extract and identify the signals of interest from a noisy background. Additional complexity arises from the fact that the AE signals are strongly non-stationary (frequency varies as a function of time as in a chirp) which leads to errors if classical signal processing techniques are employed (such as Fourier analysis). The particular strength of AE is its ability to directly detect the processes associated with wear and degradation (including friction, impacts, crushing, cracking, turbulence, etc,). This is achieved by detecting the surface component of stress waves that these processes invariably generate. These stress waves travel all over the structure’s surface.
- The Operational Modal Analysis (OMA) technique focuses on the analysis of the system’s dynamic behaviour when excited by an input. In this case the structure is excited by its normal vibration while operating and the input is considered to be stochastic which suits the case of large structure excitation like buildings and bridges. Sustained vibrations in the operational spectrum can cause excessive sustained oscillatory motion beyond the static loading condition. This will ultimately lead to structural failure. Modes describe the resonances of a system and can be used to describe the overall system dynamics. Every system response can be assembled by a superposition of weighted modal participation. Modal analysis is used in order to acquire the necessary parameters of each mode. These are the natural frequency, the mode shape (or deflection shape), and the modal damping.
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