Modelling the propagation of underwater acoustic emissions for condition monitoring of marine renewable energy
Taylor & Francis (CRC Press)
Reason for embargo
Marine Renewable Energy (MRE) has progressed towards commercialisation over the recent years but signifi-cant barriers still exist including the currently high cost of energy. A significant proportion of this cost comes from Operation and Maintenance activities which can be reduced through the use of condition-based mainte-nance scheduling. In offshore environments, the submerged location of most devices enables the use of un-derwater Acoustic Emission (AE), a new condition-monitoring technique. It combines underwater acoustics with AE condition monitoring as used in air. This paper assesses the practicality of such an approach in com-plex ocean environments through detailed sound propagation modelling using the propagation model Bellhop in the Matlab toolbox AcTUP. Results show that acoustic propagation is very sensitive to variations in the shallow water environments considered. Associated to the shallow depths, environmental variations mean that some frequencies cannot be back-propagated easily, generally limiting access to the monitoring of Received Levels. The results presented here are the first steps toward optimizing AE sensor positions and AE measuring strategies for arrays of devices.
JW is funded by the Natural Environment Research Council (NERC grant NE/L002434/1) as part of the GW4+ Doctoral Training Partnership (http://www.nercgw4plus.ac.uk/). IB is funded through the SuperGen UK Centre for Marine Energy Research (EPSRC grant EP/M014738/1).
This is the author accepted manuscript. The final version is available from CRC Press
Progress in Renewable Energies Offshore: Proceedings of the 2nd International Conference on Renewable Energies Offshore (RENEW2016), Lisbon, Portugal, 24-26 October 2016