real-time detection of parametric roll: full-scale validation galeazzi.pdfroberto galeazzi assistant...
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![Page 1: Real-time Detection of Parametric Roll: Full-scale Validation Galeazzi.pdfRoberto Galeazzi Assistant Professor @ DTU Electrical Engineering Technical University of Denmark Trondheim,](https://reader033.vdocuments.us/reader033/viewer/2022041414/5e1a2dc03fe9c8777c283209/html5/thumbnails/1.jpg)
Real-time Detection of Parametric Roll:
Full-scale Validation
Roberto Galeazzi Assistant Professor @ DTU Electrical Engineering
Technical University of Denmark
Trondheim, 27-29 May 2013
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Real-time Detection of Parametric Roll: Full-scale validation CeSOS Highlights & AMOS Visions Conference
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Time
•2009 – 2010 PostDoc within Thor I. Fossen group
Activities
•Continued research on detection methods for parametric roll resonance
•Research on nonlinear observers for autoparametric systems
Goals
•Personal Established great intrapersonal relationships which have enriched me as a man and as a researcher
•Professional PAROLL Proof-of-Concept
CeSOS and I: an exciting year
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PAROLL Early Detection of PArametric ROLL on Ships
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Real-time Detection of Parametric Roll: Full-scale validation CeSOS Highlights & AMOS Visions Conference
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Talk outline
Warning systems
Fingerprints of parametric roll
Detection methods
Monitoring system set-up
Detection scheme validation
Conclusions
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Parametric roll in a nutshell e
roll2
WAVES
PITCH
ROLL
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Parametric roll in a nutshell e
roll2
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Why warning systems?
• ship owners (hull integrity)
• cargo owners (cargo lost overboard or higly damaged)
• insurance companies (claims for millions of dollars)
Parametric roll resonance is a real threat for
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What kind of warning systems do the mariners need?
First Generation
Warning Systems
Risk prediction
Based on signals and
models
Aware route
planning
“Being aware of the problem is all very well, and a head-sea condition may often be avoided. But sometimes you have to live with it because that is where you are going. A prudent approach will then be to have some kind of warning system for the bridge watch. Most such systems will check if the conditions for parametric rolling are satisfied and then sound a signal. To do so, the system must make some kind of assessment of the sea condition and the ship motion.”
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What kind of warning systems do the mariners need?
First Generation
Warning Systems
Risk prediction
Based on signals and
models
Aware route
planning
“Being aware of the problem is all very well, and a head-sea condition may often be avoided. But sometimes you have to live with it because that is where you are going. A prudent approach will then be to have some kind of warning system for the bridge watch. Most such systems will check if the conditions for parametric rolling are satisfied and then sound a signal. To do so, the system must make some kind of assessment of the sea condition and the ship motion.”
Safe crossing is important but how does this affect
SCHEDULE RELIABILITY
and
FUEL CONSUMPTION?
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What kind of warning systems do the mariners need?
Second Generation
Warning Systems
?
? ?
“But what about lining up the peaks? Would it not be appropriate to ask for some kind of warning on ‘peak hits’? We know, both from full-scale measurements and model tests, that we need a series of ‘peak hits’ for parametric rolling to happen, and about 5–6 for it to develop fully. So when the system starts to indicate ‘hits’ we have a true indication of imminent danger. So the phase issue is important. A good system should then also give an indication of when the peaks line up, because that is also a necessary condition for parametric rolling to develop. We believe there is a need for this kind of ‘second generation’ warning system for certain ships in given trades.”
Knut Døhlie DNV Business Director
for Container Ships
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Parametric roll ... it isn’t just roll
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Fingerprints of parametric roll
PARAMETRIC ROLL
FREQUENCY COUPLING PHASE SYNCHRONIZATION
ROLL POWER SPECTRUM
PITCH POWER SPECTRUM
e roll2
PITCH [deg]
ROLL [deg]
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Spectral correlation detector
Given two signals x and y the cross-spectrum provides a measure of similarity of the two wave forms
ROLL POWER SPECTRUM
PITCH POWER SPECTRUM
e roll2
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Phase synchronization Can we characterize it in a
statistical sense?
PARAMETRIC ROLL DID NOT OCCUR PARAMETRIC ROLL DID OCCUR
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Phase synchronization
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GENERALIZED LIKELIHOOD RATIO TEST
FORCED ROLL PARAMETRIC ROLL
Double Weibull-GLRT detector
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Robustness against synchronous roll
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Robustness against synchronous roll
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Detection system robustification
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Monitoring system set-up PHASE SYNCHRONIZATION
DETECTOR FREQUENCY SYNCHRONIZATION
DETECTOR
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Time [min]
TOW
ING
TA
NK
DA
TA
Monitoring system performance I
Parametric Roll Event
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Monitoring system performance I TO
WIN
G T
AN
K D
ATA
Detect or not detect? ... This is the question
TIMELY DETECTION OF PARAMETRIC ROLL EVENT
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Monitoring system performance I TO
WIN
G T
AN
K D
ATA
Detect or not detect? ... This is the question
TIMELY DETECTION OF PARAMETRIC ROLL EVENT
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FULL
SC
ALE
DA
TA
Monitoring system performance II
Time [min]
9 hours of navigation through a storm across the Atlantic
NO EVIDENCE OF PARAMETRIC ROLL
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FULL
SC
ALE
DA
TA
Monitoring system performance II
Sensitive or not sensitive to forced roll? ... This is another question
NO SINGLE FALSE ALARM IN 9 HOURS OF NAVIGATION ACROSS A STORM
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DN
V D
ATA
– D
AY
4
Monitoring system performance III Container ship in navigation across the Pacific Ocean experiencing parametric roll
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Monitoring system performance III D
NV
DA
TA –
DA
Y 4
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Monitoring system performance III D
NV
DA
TA –
DA
Y 4
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WA
LLEN
IUS
CA
SE II
Monitoring System Performance Principal 2:1 parametric resonance in head seas
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Monitoring System Performance W
ALL
ENIU
S C
ASE
II
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Monitoring System Performance W
ALL
ENIU
S C
ASE
II
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Monitoring System Performance W
ALL
ENIU
S C
ASE
II
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WA
LLEN
IUS
CA
SE I
Monitoring system performance IV Principal 2:1 parametric resonance in following seas
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Monitoring system performance IV W
ALL
ENIU
S C
ASE
I
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Monitoring system performance IV W
ALL
ENIU
S C
ASE
I
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DN
V D
ATA
– D
AY
1/D
AY
2
Monitoring system performance V Container ship in navigation across the Pacific Ocean experiencing parametric roll
17 hours of continuous navigational records
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Monitoring system performance V D
NV
DA
TA –
DA
Y 1
/DA
Y 2
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Summary
Galeazzi, R., Blanke, M., Poulsen, N. K., “Early Detection of Parametric Roll Resonance on Container Ships”, IEEE Transactions on Control Systems Technology, 21(2), 489-507, 2013
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PAROLL & First Generation Warning System
PAROLL is
NOT alternative but
COMPLEMENTARY TECHNOLOGY
to current on-board decision support systems
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References
• Galeazzi, R., Blanke, M., Poulsen, N. K., “Early Detection of Parametric Roll Resonance on Container Ships”, IEEE Transactions on Control Systems Technology, 21(2), 489-507, 2013
• Galeazzi, R., Blanke, M., Poulsen, N. K., “Detection of Parametric Roll for Ships”, Chapter 2, Parametric Resonance in Dynamical Systems, Fossen T. I. and Nijmeijer H. Eds., Spring-Verlag, 2012
• K. A. Døhlie, “Parametric rolling. A problem solved?”, DNV Container Ship Update, 1, 12–15, Feb. 2006
Acknowledgements Det Norske Veritas and Wallenius Marine are gratefully acknowledged for providing the full scale data set for the testing of the PAROLL monitoring system.
Data from model tests were kindly provided by T. Perez (formerly CeSOS, NTNU, now University of Newcastle, Newcastle, Australia) and G. Storhaug, DNV.
Data from the Atlantic passage were logged by M. Blanke in the 1980s and are presented with the permission from Maersk Lines, Copenhagen, Denmark.
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Real-time Detection of Parametric Roll:
Full-scale Validation
Roberto Galeazzi
Trondheim, 27-29 May 2013