Parametric Roll Resonance Detection Using Phase Correlation and Log-Likelihood Testing Techniques

2009 ◽  
Author(s):  
Galeazzi, Roberto
Keyword(s):  
Phase Correlation ◽  
Parametric Roll ◽  
Log Likelihood ◽  
Testing Techniques ◽  
Parametric Roll Resonance ◽  
Resonance Detection

scholarly journals Detection of Parametric Roll Resonance using Bayesian Discrete-Frequency Model Selection

2018 ◽  
Vol 51 (29) ◽  
pp. 444-449
Author(s):  
Justin M. Kennedy ◽  
Jason J. Ford ◽  
Tristan Perez ◽  
Francis Valentinis
Keyword(s):  
Model Selection ◽  
Parametric Roll ◽  
Frequency Model ◽  
Discrete Frequency ◽  
Parametric Roll Resonance

FREQUENCY-MOTIVATED OBSERVER DESIGN FOR THE PREDICTION OF PARAMETRIC ROLL RESONANCE

2007 ◽  
Vol 40 (17) ◽  
pp. 57-62 ◽  
Author(s):  
Christian Holden ◽  
Tristan Perez ◽  
Thor I. Fossen
Keyword(s):  
Observer Design ◽  
Parametric Roll ◽  
Parametric Roll Resonance

A Non-Linear Numerical Method for the Simulation of Parametric Roll Resonance in Regular Waves

2008 ◽  
Author(s):  
T. M. Ahmed ◽  
E. J. Ballard ◽  
D. A. Hudson ◽  
P. Temarel
Keyword(s):  
Numerical Method ◽  
Potential Flow ◽  
Degrees Of Freedom ◽  
Linear Time ◽  
Three Dimensional ◽  
Regular Waves ◽  
Time Step ◽  
Parametric Roll ◽  
Non Linear ◽  
Parametric Roll Resonance

In this paper, a non-linear time-domain method is used for the prediction of parametric roll resonance in regular waves, assuming the ship to be a system with three degrees of freedom in heave, pitch and roll. Coupled heave and pitch motions are obtained using a three-dimensional frequency-domain potential flow method which also provides the requisite hydrodynamic data of the ship in roll i.e. the potential flow based added inertia and damping. Periodic changes in the underwater hull geometry due to heave, pitch and the wave profile are calculated as a function of the instantaneous breadth. This is carried out using a two-dimensional approach i.e. for sections along the ship and at each time step. This formulation leads to a mathematical model that represents the roll equation of motion with third order non-linearities in the parametric excitation terms. Non-linearities in the roll damping and restoring terms are also accounted for. This method has been applied to two different hull forms, a post-Panamax C11 class containership and a transom stern Trawler, both travelling in regular waves. Special attention is focused on the influence of different operational aspects on parametric roll. Obtained results demonstrate that this numerical method succeeds in producing results similar to those available in the literature, both numerical and experimental.

scholarly journals The Smart Detection of Ship Severe Roll Motions and Decision-Making for Evasive Actions

2020 ◽  
Vol 8 (6) ◽  
pp. 415
Author(s):  
Maria Acanfora ◽  
Flavio Balsamo
Keyword(s):  
Decision Making ◽  
Numerical Model ◽  
Wave Period ◽  
Ship Motions ◽  
Parametric Roll ◽  
Control Delay ◽  
Ship Dynamics ◽  
Speed Change ◽  
Parametric Roll Resonance

This paper presents a numerical model for the smart detection of synchronous and parametric roll resonance of a ship. The model implements manoeuvring equations superimposed onto ship dynamics in waves. It also features suited autopilot and rudder actuator models, aiming at a fair depiction of the control delay. The developed method is able to identify and distinguish between synchronous and parametric roll resonance, based on the estimation of encounter wave period from ship motions. Therefore, it could be useful as a smart tool for manned vessels and, also, in the perspective of unmanned and autonomous vessels (in the paper it is assumed a hypothetical remote crew). Once the resonance threat is identified, different evasive actions are simulated and compared, based on course and speed change. Calculations are carried out on a ro-ro pax vessel vulnerable to parametric roll. We conclude that, in roll resonance situations, and in the absence of roll stabilisation systems on-board, course change could be the most effective countermeasure.

scholarly journals Investigation of Parametric Resonance in Roll for Container Carrier Ships

2015 ◽  
Author(s):  
Isar Ghamari ◽  
Odd M. Faltinsen ◽  
Marilena Greco
Keyword(s):  
Parametric Resonance ◽  
Potential Flow ◽  
Present Method ◽  
Design Stage ◽  
Sea Waves ◽  
Parametric Roll ◽  
Fishing Vessels ◽  
Strip Theory ◽  
Parametric Roll Resonance ◽  
2D And 3D

Parametric roll resonance is of concern for container and fishing vessels, especially in head-sea waves. Here this phenomenon is investigated with a numerical method based on potential-flow theory with viscous corrections for the roll damping. The seakeeping problem is handled by considering a strip theory and assuming a 5-DOF system. Nonlinearities are accounted for in the Froude-Krylov and hydrostatic loads. The solver has been validated against experiments on a C11 class container carrier ship in terms of parametric resonance occurrence and features for different ship forward speeds and headings, wavelengths, wave amplitudes and wave headings. The overall agreement is good but there are some discrepancies. For instance, the simulations show capsizing in some cases while it does not happen in the experiments. The results from present method can be used to generate 2D and 3D polar diagrams identifying the zones with parametric roll occurrence, and are very handy for masters aboard ships. This type of information is valuable at design stage and can be used aboard vessels for a safer voyage.

scholarly journals Nonlinear Container Ship Model for the Study of Parametric Roll Resonance

2007 ◽  
Vol 28 (4) ◽  
pp. 87-103 ◽  
Author(s):  
Christian Holden ◽  
Roberto Galeazzi ◽  
Claudio Rodríguez ◽  
Tristan Perez ◽  
Thor Inge Fossen ◽  
...  
Keyword(s):  
Container Ship ◽  
Parametric Roll ◽  
Ship Model ◽  
Parametric Roll Resonance
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