Abstract
This paper investigates sway, roll and yaw motions of a floating body with the aim to determine coupled motion characteristics based on the order-wise analysis of hydrodynamic coefficients. To compute the hydrodynamic coefficients and wave force exerted on the floating body, we employ speed-dependent strip theory. The governing equations are solved analytically for linear restoring moment. For nonlinear restoring moment which is expressed as an odd-order polynomial of fifth degree in roll angle, we apply the Runge–Kutta–Gill method to solve the coupled equations. To investigate the effect of initial disturbances on sway, roll, yaw and speed of the body, numerical experiments have been carried out for a Panamax Container ship under the action of a sinusoidal wave of periodicity 11.2 s with varying wave height and speed. For the linear restoring moment, we first derive associated motion equations for various cases based on the relative magnitude of the hydrodynamic coefficients. The order-wise analysis leads to the classification of coupled characteristics exhibiting the nature of coupling. For the nonlinear restoring moment, we notice that the initial disturbance plays an important role in the ship’s stability. The effects of forward speed and variation in wave heights are illustrated through typical numerical experiments.
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Abbreviations
- A ij :
-
Added-mass cross coupling coefficients for the jth mode coupled into the ith mode of motion
- \({A_{ij}^0}\) :
-
Speed-independent part of A ij
- B ij :
-
Damping cross coupling coefficients for the jth mode coupled with the ith mode of motion
- \({B_{ij}^0}\) :
-
Speed-independent part of B ij
- \({B_{44}^\ast}\) :
-
Viscous damping in roll
- C ij :
-
Hydrostatic restoring cross coupling coefficients for the jth mode coupled with the ith mode
- F j :
-
Exciting force and moment due to waves
- \({\bar{F}_j}\) :
-
Amplitude of wave exciting force/moment
- \({\overline{GM}}\) :
-
Metacentric height
- I j :
-
Moment of inertia in jth mode
- I jk :
-
Product of inertia
- M :
-
Mass of the body
- M jk :
-
Generalized mass matrix for the body
- U :
-
Speed of the body
- a ij :
-
two-dimensional sectional added mass coefficient
- \({a_{ij}^A}\) :
-
a ij for aftermost section
- b ij :
-
two-dimensional sectional damping coefficient
- \({b_{ij}^A}\) :
-
b ij for aftermost section
- f j :
-
Sectional Froude–Kryloff force
- g :
-
Gravitational acceleration
- h j :
-
Sectional diffraction force
- \({h_j^A}\) :
-
h j for aftermost section
- i, j, k:
-
Subscript (i, j, k = 1, 2, . . . , 6)
- t :
-
Time variable
- x, y, z:
-
Coordinate system
- z c :
-
z-Coordinate of center of gravity
- Δ:
-
Displacement of vessel
- α :
-
Incident wave amplitude
- β :
-
Undamped natural frequency of the damped system
- η :
-
Displacement
- \({\dot{\eta}}\) :
-
First order derivative of η with respect to time
- \({\ddot{\eta}}\) :
-
Second order derivative of η with respect to time
- θ :
-
Phase angle
- ρ :
-
Mass density of water
- ς :
-
Damping factor
- ω :
-
Wave encountering frequency
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Das, S.N., Shiraishi, S. & Das, S.K. Mathematical modeling of sway, roll and yaw motions: order-wise analysis to determine coupled characteristics and numerical simulation for restoring moment’s sensitivity analysis. Acta Mech 213, 305–322 (2010). https://doi.org/10.1007/s00707-009-0278-9
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DOI: https://doi.org/10.1007/s00707-009-0278-9