Wave spectra are estimated from wave frequency motions of a vessel at zero or low advance speed. Minimization of a cost functional that indicates how well the estimated spectrum results in the measured motion spectra was based on sequential quadratic programming and a genetic algorithm. Two procedures have been developed and applied to numerically simulated motions of a 59 m length offshore supply vessel.

Issue Section:
Technical Papers
Keywords:
ocean waves, ships, genetic algorithms, minimisation, gradient methods, spectral estimation, ship motions, wave spectra
Topics:
Genetic algorithms, Spectra (Spectroscopy), Vessels, Wave frequency, Waves, Ocean waves, Ships, Transfer functions
1.
Takekuma
,
K.
, and
Takahashi
,
T.
, 1973, “
On the Evaluation of Sea Spectra Based on the Measured Ship Motions
,” Trans. West—Jpn. Soc. Nav. Archit., 45, pp.
51
–
57
.
2.
Iseki
,
T.
, 2004, “
Extended Bayesian Estimation of Directional Wave Spectra
,”
Proceedings of the 23rd International Conference on Offshore Mechanics and Arctic Engineering
, Vancouver, Canada, June 20–25,
ASME
, Paper No. OMAE2004-51609.
3.
Waals
,
O. J.
,
Aalbers
,
A. B.
, and
Pinkster
,
J. A.
, 2002, “
Maximum Likelihood Method as a Means to Estimate the Directional Wave Spectrum And Mean Drift Force on a Dynamically Positioned Vessel
,”
Proceedings of the 21st International on Offshore Mechanics and Arctic Engineering
, Oslo, Norway, June 23–28,
ASME
, Paper OMAE2002-28560.
4.
Tannuri
,
E. A.
, 2002, “
Development of Methodology for Design of Dynamic Positioning Systems Applied to Offshore Operations
,” Ph.D.. thesis, University of São Paulo, Brazil, in Portuguese.
5.
Tannuri
,
E. A.
,
Sparano
,
J. V.
,
Simos
,
A. N.
, and
Da Cruz
,
J. J.
, 2003, “
Estimating Directional Wave Spectrum Based on Stationary Ship Motion Measurements
,”
Appl. Ocean. Res.
0141-1187,
25
, pp.
243
–
261
.
Crossref
Search ADS
 
6.
Herbers
,
T. H. C.
, and
Guza
,
R. T.
, 1990, “
Estimation of Directional Wave Spectra from Multicomponent Observations
,”
J. Phys. Oceanogr.
1520-0485,
20
(
11
), pp.
1703
–
1724
.
Crossref
Search ADS
 
7.
Iseki
,
T.
, and
Daisuke
,
T.
, 2002, “
Bayesian Estimation of Directional Wave Spectra for Ship Guidance System
,”
Int. J. Offshore Polar Eng.
1053-5381,
12
(
1
), pp.
25
–
30
.
8.
Tannuri
,
E. A.
,
Simos
,
A. N.
,
Sparano
,
J. V.
, and
da Cruz
,
J. J.
, 2001, “
Directional Wave-Spectrum Based on Moored FPSO Motions
,”
Proceedings of the 20th International Conference on Offshore Mechanics and Arctic Engineering
, Rio de Janeiro, Brazil, June 3–8,
ASME
, Paper No. OMAE01/OFT-1094.
9.
Iseki
,
T.
, and
Ohtsu
,
K.
, 2000, “
Bayesian Estimation of Wave Spectra Based on Ship Motions
,”
Control Eng. Pract.
0967-0661,
8
, pp.
215
–
219
.
Crossref
Search ADS
 
10.
Saito
,
K.
,
Maeda
,
K.
,
Matsuda
,
A.
, and
Suzuki
, 2000, “
An Estimation of Wave Characteristics Based on Measured Ship Motions (3rd Report)
,”
J. Soc. Nav. Archit. Jpn.
0514-8499,
187
, pp.
77
–
83
.
11.
Newman
,
J. N.
, and
Sclavounos
,
P. D.
, 1988, “
The Computation of Wave Loads on Large Offshore Structures
,”
Proceedings International Conference on the Behaviour of Offshore Structure, (BOSS88)
,
T.
Moan
,
N.
Janba
, and
O.
Faltinsen
, eds.,
Tapir Publishers
,
Trondheim, Norway
, Vol.
2
, pp.
605
–
622
.
12.
Linfoot
,
B. T.
, and
Wright
,
V. J. C.
, 1995, “
Wave Feedforward Control of Floating Production Systems
,”
Control Eng. Pract.
0967-0661,
3
(
5
), pp.
687
–
694
.
Crossref
Search ADS
 
13.
Fathi
,
D.
, and
Hoff
,
J. R.
, 2004,
ShipX Vessel Responses (VERES)—Theory Manual
,
MARINTEK AS
, Trondheim, Norway.
Copyright © 2007
 by American Society of Mechanical Engineers
You do not currently have access to this content.