Flexible Riser Monitoring Using Hybrid Magnetic/Optical Strain Gage Techniques through RLS Adaptive Filtering

EURASIP Journal on Advances in Signal Processing

Table 6 Trial details.

Laboratory	Laboratory LAMEF at UFRGS University
Local	Porto Alegre-RS-Brazil
Date	2009/06/24 and 25
Sample	5 meters long riser sample
Total external diameter	250.7 mm
External sheath thickness	7 mm
Number of external sheaths	2
MAPS-FR mounted diameter	(1 sheath removed) 236.7 mm
External armor layer	37 flat wires: 15 mm 5 mm at 30 degrees
Reference instrumentation	Optical strain gages on every wire
Global riser load estimate	Average of optical strain gages
Loading	Sinusoidal, 160 to 220 ton, frequency 0.0167 Hz
Magnetic stress measuring tool	MAPS-FR
Signal processing algorithm	Hybrid MAPS-FR/Optical strain gage