A model for deployment of a freefall lifeboat from a moving ramp into waves

Raman-Nair, W.; White, Merit P.

doi:10.1007/s11044-012-9308-9

Cited by 5 publications

(3 citation statements)

References 4 publications

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“…20is also valid in this method. The matrix form of governing motion equations could be written as follows: 17,24,25 M Kane(n−r)×(n−r)u(n−r)×1 + N Kane(n−r)×nqn×1 + G Kane(n−r)×1 = F Kane(n−r)×1 ,…”

Section: A Variant Of Kane's Methodsmentioning

confidence: 99%

Comparison of Kane’s and Lagrange’s Methods in Analysis of Constrained Dynamical Systems

Talaeizadeh¹,

Forootan²,

Zabihi³

et al. 2020

Robotica

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SUMMARY Dynamic modeling is a fundamental step in analyzing the movement of any mechanical system. Methods for dynamical modeling of constrained systems have been widely developed to improve the accuracy and minimize computational cost during simulations. The necessity to satisfy constraint equations as well as the equations of motion makes it more critical to use numerical techniques that are successful in decreasing the number of computational operations and numerical errors for complex dynamical systems. In this study, performance of a variant of Kane’s method compared to six different techniques based on the Lagrange’s equations is shown. To evaluate the performance of the mentioned methods, snake-like robot dynamics is considered and different aspects such as the number of the most time-consuming computational operations, constraint error, energy error, and CPU time assigned to each method are compared. The simulation results demonstrate the superiority of the variant of Kane’s method concerning the other ones.

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Section: A Variant Of Kane's Methodsmentioning

confidence: 99%

Comparison of Kane’s and Lagrange’s Methods in Analysis of Constrained Dynamical Systems

Talaeizadeh¹,

Forootan²,

Zabihi³

et al. 2020

Robotica

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“…Karim et al [24,25] applied Arai's model and took the effect of regular waves into account when calculating speed of the boat entering the water. Raman-Nair and White [26] used multibody dynamics to analyze the entry of the boat from an offshore platform with simple movement. The rotation phase at skid exit is automatically modeled in this way.…”

Section: Related Workmentioning

confidence: 99%

“…The generalized contact force can be solved by Equation 14, the generalized force caused by gravity and inertia can be solved by Equations (9) and (10), and the generalized velocities and generalized coordinates of the boat can be solved by Equation (15). In the second stage, the generalized force caused by inertial, gravity, air drag, fluid drag, buoyancy, and slamming force can be solved by Equations (32), (34), (36), (38), (44) and (47); the generalized velocities of the boat can be solved by Equation (64); and the generalized coordinates of the boat can be solved by Equations (26) and (27). For the two stages, 20 lifeboat segments were used.…”

Section: Experimental Setup and Implementationmentioning

confidence: 99%

Computational Model for Simulation of Lifeboat Free-Fall during Its Launching from Ship in Rough Seas

Qiu

Ren

2020

JMSE

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In order to improve the accuracy of the freefall of lifeboat motion simulation in a ship life-saving simulation training system, a mathematical model using the strip theory and Kane’s method is established for the freefall of the lifeboat into the water from a ship. With the boat moving on a skid, the model of the ship’s maneuvering mathematical group (MMG) is used to model the motion of the ship in the waves. Based on the formula of elasticity and friction theory, the forces of the skid acting on the boat are calculated. When the boat enters the water, according to the analytical solution theory of slamming, the slamming force of water entry is solved. The simulation experiments are carried out by the established model. The results of the numerical simulation are compared with the calculation results of the hydrodynamics software Star CCM+ at water entry under initial condition A in the paper. The position and velocity of the center of gravity of the boat, the angle, and velocity and acceleration of pitch calculated by the two methods are in good agreement. There is a little difference between the values of translation acceleration calculated by the two methods, which is acceptable. This shows that our numerical algorithm has good accuracy. A qualitative analysis is performed to find the safe point of water entry under the condition of different wave heights and two situations of a ship encountering waves. Finally, the model is applied to the ship life-saving training system. The model can meet the system requirements and improve the accuracy of the simulation.

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3D motion model for the freefall lifeboat during its launching from a moving ship

et al. 2023

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A model for deployment of a freefall lifeboat from a moving ramp into waves

Cited by 5 publications

References 4 publications

Comparison of Kane’s and Lagrange’s Methods in Analysis of Constrained Dynamical Systems

Comparison of Kane’s and Lagrange’s Methods in Analysis of Constrained Dynamical Systems

Computational Model for Simulation of Lifeboat Free-Fall during Its Launching from Ship in Rough Seas

3D motion model for the freefall lifeboat during its launching from a moving ship

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