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Numerical model method for solving ship horizontal motion response divergence in oblique waves

A numerical model, horizontal motion technology, applied in electrical digital data processing, special data processing applications, instruments, etc., can solve problems such as the resolution and divergence of ship horizontal motion response

Active Publication Date: 2019-07-12
HARBIN INST OF TECH AT WEIHAI
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Problems solved by technology

[0005] The purpose of the present invention is to overcome the deficiencies of the above-mentioned existing methods. Starting from the maneuverability of the ship, the effect of the rudder force is considered by means of the autopilot, and it is included in the equation of motion for solution, so as to eliminate the drift phenomenon, thereby solving the problem of inclination in the time domain. Divergence of response solutions for horizontal motion of ships in waves

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  • Numerical model method for solving ship horizontal motion response divergence in oblique waves
  • Numerical model method for solving ship horizontal motion response divergence in oblique waves
  • Numerical model method for solving ship horizontal motion response divergence in oblique waves

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Embodiment approach

[0042] Taking the elastic hull as an example, generally speaking, the motion of the ship can be regarded as a forced vibration under the wave excitation force, so there are,

[0043]

[0044] Among them, [a],[b],[c]——structure generalized mass matrix, generalized damping matrix, generalized stiffness matrix.

[0045] {F r (t)}—the total fluid force of the rth order at each instant can be regarded as a combination of a series of fluid forces acting on the hull, which can be expressed as:

[0046] r=1,2...6——represents the motion mode of six degrees of freedom of the rigid body; r≥7——elastic mode.

[0047] {F r (t)}={F r S (t)}+{F r I (t)}+{F r D (t)}+{F r R (t)}+{F r slamming (t)}+{F r δ (t)} (12)

[0048] where {F r s (t)}——Static water restoring force of order r; {F r δ (t)}——rth order rudder force (moment).

[0049] f r I (t), F r D (t)——the incident wave force and diffracted wave force on the r-th order hull;

[0050] {F r slamming (t)}—the sla...

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Abstract

The invention relates to a numerical model method for solving ship horizontal motion response divergence in oblique waves. Specifically, the method comprises the following steps: step 1, on the basisof a PID (proportional integral and derivative) autopilot basic control equation, establishing a rudder force component expression on swaying motion and yawing motion in a matrix mode; step 2, including the force (moment) in a rigid / elastic hull motion equation; step 3, respectively solving each coefficient and acting force in the equation; step 4, finally, based on a Runge-Kutta method, solving an equation to obtain a hull motion response, and obtaining an elastomer load response by means of a modal superposition principle. According to the method, the defect of response divergence caused bysolving of the hull horizontal time domain motion equation in oblique waves can be fundamentally overcome, the method is suitable for load calculation of ships and ocean platforms, and a foundation can be provided for load response prediction of random waves.

Description

technical field [0001] The invention relates to the hydrodynamic field of ship and marine engineering wave load technology, and can be used for a numerical model method for divergence of the ship's horizontal motion response in oblique waves of a rigid ship type and an elastic body ship type. Background technique [0002] As we all know, the real ocean environment is oblique waves, and waves may come from any direction. In actual voyage, ships in waves keep their course by constantly adjusting the rudder. The patent applicant once conducted a numerical simulation of the ship's horizontal motion in the time domain and found that since the ship's horizontal motion does not have restoring force, there is no mechanism for the ship to return to its original position once drift occurs during the time history simulation of the ship's horizontal motion. On the heading of , it is difficult to guarantee a steady-state solution even in regular waves. The solution for horizontal motio...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/50
CPCG06F30/15G06F30/23G06F2119/06Y02T90/00
Inventor 陈占阳
Owner HARBIN INST OF TECH AT WEIHAI
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