Rapid forecasting method for ship vertical motion response

A technology of vertical motion and differential equations of motion, applied in the field of ships, can solve the problems of difficult to apply ship concept design stage, long time consumption, complicated calculation methods, etc., to save computer memory resources, save calculation time, and simplify calculation process. Effect

Active Publication Date: 2021-02-02
SOUTH CHINA UNIV OF TECH
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Problems solved by technology

Although the above-mentioned theoretical method can accurately predict the motion response of the ship in waves, it involves solving complex problems such as the interaction between the hull of any geometric shape, the free surface, and the wave, and has the disadvantages of complex calculation methods, heavy calculation workload, and long time-consuming. shortcoming
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  • Rapid forecasting method for ship vertical motion response
  • Rapid forecasting method for ship vertical motion response
  • Rapid forecasting method for ship vertical motion response

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Embodiment Construction

[0059] The present invention will be further described in detail below in conjunction with the embodiments and the accompanying drawings, but the embodiments of the present invention are not limited thereto.

[0060] Such as figure 1 As shown, a right-handed coordinate system is introduced to define the ship motion. The origin O is at the center of gravity of the ship, OX points to the bow, OY points to the port side, and OZ points to the sky. When a ship sails in waves, in addition to the linear motion along the speed direction, it will also produce six degrees of freedom swaying motion. The reciprocating oscillations of the ship along the longitudinal axis (OX axis), transverse axis (OY axis) and vertical axis (OZ axis) passing through its center of gravity are respectively called surge, sway and heave motions, which belong to linear displacement motion; The angular oscillations of the above three axes are respectively called rolling, pitching and yaw motions, which belong...

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Abstract

The invention discloses a method for quickly forecasting vertical motion response of a ship, and the method comprises the following steps: obtaining a heaving motion differential equation and a pitching motion differential equation of the ship in regular waves, and measuring ship type parameters and navigation working condition parameters of the ship; according to the heaving motion differential equation, the pitching motion differential equation, the ship type parameters and the working condition parameters, obtaining a frequency response function of heaving motion at the gravity center of the ship and a frequency response function of pitching motion of the ship; and employing a frequency response function of heaving motion at any cross section of the ship and a frequency response function of vertical acceleration at any cross section of the ship for realizing the rapid prediction of vertical motion of the ship. According to the rapid forecasting method for the vertical movement of the ship, complex steps of geometric modeling of the ship body, hydrodynamic mesh generation, hydrodynamic calculation analysis and the like are avoided, and calculation time and computer memory resources are greatly saved. The invention relates to the technical field of ships.

Description

technical field [0001] The invention relates to the technical field of ships, in particular to a rapid prediction method for vertical motion responses of ships. Background technique [0002] Ships are moored or sailing at sea throughout their lifespan. There are waves on the sea surface for more than 70% of the time, and ships are under the action of waves most of the time. In the space Cartesian coordinate system, the ship’s six-degree-of-freedom motion includes translation in three directions (surge, sway, and heave) and rotation in three directions (roll, pitch, and yaw). Heave has the greatest influence on the vertical motion performance of the ship. [0003] Vigorous vertical motion of a ship can lead to poor navigation performance of the ship and threaten the safety of the ship, the usability of equipment and the habitability of personnel. For example, severe pitching and heaving motions will reduce the working capacity of personnel and equipment on board, and can ca...

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Application Information

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IPC IPC(8): G06F17/13G06F17/15
CPCG06F17/13G06F17/15Y02T70/10
Inventor 焦甲龙黄松兴
Owner SOUTH CHINA UNIV OF TECH
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