Ship motion prediction method based on Taylor expansion boundary element method

A technology of ship motion and boundary element, applied in the field of simulation, can solve complex problems

Active Publication Date: 2022-07-15
HARBIN ENG UNIV
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Problems solved by technology

Because the DB free surface condition is designed to calculate the second derivative of the stack potential, it is more complicated than the NK free surface condition

Method used

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  • Ship motion prediction method based on Taylor expansion boundary element method
  • Ship motion prediction method based on Taylor expansion boundary element method
  • Ship motion prediction method based on Taylor expansion boundary element method

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Embodiment Construction

[0021] The present invention will be described in more detail with examples below.

[0022] 1) Read the grid file to automatically extract the ship waterline information (including the space coordinates of the first and last stagnation points, and the waterline fitting curve function). Combined with the flow field matching boundary intelligence parameters and waterline information, the water surface and matching surface discrete meshes conforming to the boundary element method are automatically generated. And based on the discrete mesh of the hull, the ship displacement volume, buoyancy center, drift center, moment of inertia, wet surface area and other hydrostatic parameters are calculated. Check the error between the numerical results of the hydrostatic parameters and the physical ship parameters to verify the quality of the ship mesh.

[0023] 2) The present invention utilizes Taylor expansion boundary elements to solve each velocity potential component and its first-order...

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Abstract

The invention provides a ship motion prediction method based on the Taylor expansion boundary element method. Read the grid file and perform hydrostatic calculation; calculate the influence coefficient matrix of the boundary integral equation required by the Taylor expansion boundary element method; Its space normal derivative solution; radiation velocity potential instantaneous term and its spatial first and second derivative solutions; radiation velocity potential memory term and its space first and second derivative solutions; additional mass, wave damping, radiation wave force impulse response function Solving; full wave downward incident velocity potential impulse response function solving; diffraction velocity potential and its spatial first and second derivatives, diffraction wave force impulse response function solving; full wave direction ship motion solution; ship motion spectrum under various sea conditions analysis caculate. The invention can predict the hydrodynamic coefficient of the three main ship types, the wave load, the six-degree-of-freedom motion of the ship in the full wave direction, and the analysis of the ship motion spectrum under various sea conditions.

Description

technical field [0001] The invention relates to a simulation method, in particular to a method for calculating steady and unsteady velocity potential impulse response functions by using the Taylor expansion boundary element method, so as to predict the three-dimensional ship motion RAO in full wave direction. Background technique [0002] Ship seakeeping has always been an important ship performance index that ship designers pay attention to, and has an important impact on cargo safety, passenger comfort, and ship energy consumption. However, it is still difficult to develop 3D ship motion forecast software suitable for any ship type. [0003] The tails of container ships are all of the large floating ship type, and the time-domain Green's function method is used to solve the numerical divergence problem. Therefore, the simple Green's function method is used for the time-domain prediction of the large floating ship motion. Oil tankers and bulk carriers have large square co...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F30/15G06F30/20
CPCG06F30/15G06F30/20Y02T90/00
Inventor 陈纪康段文洋
Owner HARBIN ENG UNIV
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