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| Naji, M. |
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| Motta, Antonella |
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| Aletan, Dirar |
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| Mohamed, Tarek |
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| Ertürk, Emre |
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| Taccardi, Nicola |
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| Kononenko, Denys |
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| Petrov, R. H. | Madrid |
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| Alshaaer, Mazen | Brussels |
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| Bih, L. |
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| Casati, R. |
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| Muller, Hermance |
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| Kočí, Jan | Prague |
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| Šuljagić, Marija |
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| Kalteremidou, Kalliopi-Artemi | Brussels |
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| Azam, Siraj |
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| Ospanova, Alyiya |
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| Blanpain, Bart |
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| Ali, M. A. |
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| Popa, V. |
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| Rančić, M. |
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| Ollier, Nadège |
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| Azevedo, Nuno Monteiro |
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| Landes, Michael |
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| Rignanese, Gian-Marco |
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Gaydecki, Patrick
in Cooperation with on an Cooperation-Score of 37%
Topics
Publications (8/8 displayed)
- 2017Structural Health Monitoring Using Lamb Wave Reflections and Total Focusing Method for Image Reconstructioncitations
- 2016Lamb Waves Boundary Reflections in an Aluminium Plate for Defect Detection related to Structural Health Monitoring.
- 2011Initial studies on the use of electric field for imaging rebars embedded within concrete
- 2007Flood member detection for real-time structural health monitoring of sub-sea structures of offshore steel oilrigscitations
- 2005Continuous monitoring guided wave encoded sensor for oil rig flooded member detectioncitations
- 2005An axisymmetric guided wave encoded system for flood detection of oil rig cross-beamscitations
- 2005A combined Q and heterodyne sensor incorporating real-time DSP for reinforcement imaging, corrosion detection and material characterisationcitations
- 2000Haemodynamic effects of increasing angle of head up tiltcitations
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article
An axisymmetric guided wave encoded system for flood detection of oil rig cross-beams
Abstract
A novel and completely autonomous guided wave system for flood detection in the hollow cross-beam members of offshore steel oil rigs is presented. Underwater non-destructive testing methods such as ultrasound have been used to inspect for the presence of seawater in these applications, often in conjunction with remote operating vehicles. Alternatively, a monolithic PZT guided wave transducer which can be permanently attached to a sub-sea installation and that can be powered by the action of the seawater is now being developed. Upon activation, the transducer transmits an ultrasound-encoded signal to a receiver, in the form of a real-time digital signal processing system at the surface level. Experiments have been carried out using a jointed steel pipe structure, 10 m in length, 0.5 m in diameter and 16 mm in thickness, completely immersed in seawater. The transmitter was attached to the inner wall of a spur pipe and configured to generate narrow bandwidth, low frequency ultrasonic chirp signals, coupled to the pipe as an axisymmetric mode. Results confirmed that although some attenuation occurs, the system signal processing system successfully identified the signals above the background noise.