NDLI: Efficient estimation of extreme non-linear roll motions using the first-order reliability method (FORM)

Content Provider	Springer Nature Link
Author	Jensen, Jørgen Juncher
Copyright Year	2007
Abstract	In on-board decision support systems, efficient procedures are needed for real-time estimation of the maximum ship responses to be expected within the next few hours, given online information on the sea state and user-defined ranges of possible headings and speeds. For linear responses, standard frequency domain methods can be applied. For non-linear responses, as exhibited by the roll motion, standard methods such as direct time domain simulations are not feasible due to the required computational time. However, the statistical distribution of non-linear ship responses can be estimated very accurately using the first-order reliability method (FORM), which is well known from structural reliability problems. To illustrate the proposed procedure, the roll motion was modelled by a simplified non-linear procedure taking into account non-linear hydrodynamic damping, time-varying restoring and wave excitation moments, and the heave acceleration. Resonance excitation, parametric roll, and forced roll were all included in the model, albeit with some simplifications. The result is the mean out-crossing rate of the roll angle together with the most probable wave scenarios (critical wave episodes), leading to user-specified specific maximum roll angles. The procedure is computationally very effective and can thus be applied to real-time determination of ship-specific combinations of heading and speed to be avoided in the actual sea state.
Starting Page	191
Ending Page	202
Page Count	12
File Format	PDF
ISSN	09484280
Journal	Journal of Marine Science and Technology
Volume Number	12
Issue Number	4
e-ISSN	14378213
Language	English
Publisher	Springer-Verlag
Publisher Date	2007-11-28
Publisher Place	Tokyo
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Roll motion Parametric roll FORM Reliability Mean out-crossing rate On-board decision support systems Automotive and Aerospace Engineering, Traffic Engineering Fluid Dynamics Engineering Design Offshore Engineering Mechanical Engineering
Content Type	Text
Resource Type	Article
Subject	Oceanography Ocean Engineering Mechanics of Materials Mechanical Engineering

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