Rapid forecasting method for ship vertical motion response

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...

AI Technical Summary

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

In addition, in the stage of ship conceptual design, it is generally necessary to calculate the seakeeping of multiple or even a large number of alternative ship types, and it is often difficult to determine all the ship type parameters and data required for theoretical calculations, which makes conventional theoretical calculations difficult to apply to ships. concept design stage

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