Estimation of Rolling Motion of Ship in Random Beam Seas by Efficient Analytical and Numerical Approaches

2021 ◽  
Author(s):  
M. Salai Mathi Selvi ◽  
L. Rajendran ◽  
Marwan Abukhaled
Keyword(s):  
Rolling Motion ◽  
Beam Seas ◽  
Numerical Approaches

ROLLING OF TROLLING LINER ON SINJAI REGENCY

2017 ◽  
Vol 7 (2) ◽  
pp. 159 ◽  
Author(s):  
Aulia Azhar Wahab ◽  
St. Aisjah Farhum ◽  
Faisal Amir
Keyword(s):  
Good Stability ◽  
Rolling Motion ◽  
High Wave ◽  
Beam Seas

Trolling liner was a dominance used by fishermans in Sinjai Regency was made by traditional without planning before, so stability and seakeeping ability about sea condition was unknown. The research aimed to analyze the rolling motion of trolling liner in regular condition of beam seas. The research was a case study of trolling liner used by the fisherman in Sinjai.Geometry measurement vessel formwas done to get a model of trolling liner and then make a redesign as a comparedand thenmake a simulation using program Maxsurf v8.i.the result showed that the sample have a good stability. Higher rollingwas 18,168 onhigh wave -0,1971 m and lowerrollingwas -18,168 on high wave 0,1971 m,while theredesignshowed higherrollingwas 14,102 on high wave -0,1970 m and lowerrollingwas -14,102 on high wave 0.1968 m.

scholarly journals Chaos analysis of ship rolling motion in stochastic beam seas

2017 ◽  
Vol 19 (8) ◽  
pp. 6403-6412 ◽  
Author(s):  
Shenghong Li ◽  
Kangkang Wang
Keyword(s):  
Rolling Motion ◽  
Chaos Analysis ◽  
Beam Seas ◽  
Ship Rolling

scholarly journals Study for the Safety of Ships' Nonlinear Rolling Motion in Beam Seas

2009 ◽  
Vol 33 (9) ◽  
pp. 629-634 ◽  
Author(s):  
Zhan-Jun Long ◽  
Seung-Keon Lee ◽  
Jae-Hun Jeong ◽  
Sung-Jong Lee
Keyword(s):  
Rolling Motion ◽  
Beam Seas ◽  
Nonlinear Rolling

Highly Nonlinear Rolling Motion of Biased Ships in Random Beam Seas

1996 ◽  
Vol 40 (02) ◽  
pp. 125-135 ◽  
Author(s):  
Changben Jiang ◽  
Armin W. Troesch ◽  
Steven W. Shaw
Keyword(s):  
Phase Space ◽  
Ship Motions ◽  
Unperturbed System ◽  
Rolling Motion ◽  
Dynamical Systems Analysis ◽  
Beam Seas ◽  
Highly Nonlinear ◽  
Recent Developments ◽  
Safe Region ◽  
Analytical Tools

Recent developments in dynamical systems analysis are applied and extended to the study of highly nonlinear ship rolling motion and capsizing in random beam seas. Damping and wave excitation moments are dealt with as perturbations since they are relatively small compared with inertial effects and hydrostatic righting moments. There is no restriction on the restoring moment due to hydrostatic loads, and bias effects are included. Safe and unsafe areas are defined in the phase plane of the unperturbed system model to distinguish the qualitatively different ship motions of capsize and noncapsize. Capsize events are represented by solutions passing out of the safe region. The probability of such an occurrence is studied using the Melnikov function and the concept of phaseflux rates. Expressions for the phase space flux rate are derived and evaluated by numerical integration. The correlation of phase space flux and capsize is investigated through extensive simulation. It is shown that these analytical tools provide reliable, predictive information regarding the likelihood of a vessel capsize in a given sea state.

Fore-Aft Forces in Tire-Wheel Assemblies Generated by Unbalances and the Influence of Balancing

1991 ◽  
Vol 19 (3) ◽  
pp. 142-162 ◽  
Author(s):  
D. S. Stutts ◽  
W. Soedel ◽  
S. K. Jha
Keyword(s):  
Mathematical Model ◽  
Elastic Foundation ◽  
Torsional Oscillation ◽  
Vertical Direction ◽  
Torsional Stiffness ◽  
Rolling Motion ◽  
Vertical Force ◽  
Horizontal Force ◽  
Wheel Rim ◽  
Open Question

Abstract When measuring bearing forces of the tire-wheel assembly during drum tests, it was found that beyond certain speeds, the horizontal force variations or so-called fore-aft forces were larger than the force variations in the vertical direction. The explanation of this phenomenon is still somewhat an open question. One of the hypothetical models argues in favor of torsional oscillations caused by a changing rolling radius. But it appears that there is a simpler answer. In this paper, a mathematical model of a tire consisting of a rigid tread ring connected to a freely rotating wheel or hub through an elastic foundation which has radial and torsional stiffness was developed. This model shows that an unbalanced mass on the tread ring will cause an oscillatory rolling motion of the tread ring on the drum which is superimposed on the nominal rolling. This will indeed result in larger fore-aft than vertical force variations beyond certain speeds, which are a function of run-out. The rolling motion is in a certain sense a torsional oscillation, but postulation of a changing rolling radius is not necessary for its creation. The model also shows the limitation on balancing the tire-wheel assembly at the wheel rim if the unbalance occurs at the tread band.

Comparison of heat transfer in natural and forced circulation under rolling motion

Kerntechnik ◽  
2020 ◽  
Vol 85 (2) ◽  
pp. 82-87
Author(s):  
C. Wang ◽  
E. Shi ◽  
L. Sun ◽  
W. Chen
Keyword(s):  
Heat Transfer ◽  
Rolling Motion ◽  
Forced Circulation
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