Rapid forecasting method for ship rolling motion response

Abstract

The invention discloses a rapid forecasting method for ship rolling motion response, which comprises the following steps of: simplifying a complex ship body structure into a combination of two cuboids with different widths B and a same draft T, connecting and arranging the cuboids along the longitudinal direction, and ensuring that the middle longitudinal sections of the two cuboids are overlapped; obtaining ship type parameters of the ship and calculating working condition parameters; obtaining a motion differential equation of ship rolling response induced by regular waves of unit amplitude; and according to a motion differential equation of ship rolling response induced by regular waves of unit amplitude, the ship type parameters and the calculation working condition parameters, obtaining a frequency response function of ship rolling motion, and achieving rapid forecasting of ship rolling motion response. The method can quickly forecast the rolling motion response of the ship, and is suitable for conceptual design and preliminary design stages of the ship. The invention relates to the technical field of ship motion forecasting.

Description

technical field [0001] The invention relates to the technical field of ship motion prediction, in particular to a fast prediction method for ship roll motion response. Background technique [0002] Ships are moored or sailing at sea throughout their service life. 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 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). Ships are most prone to roll motion at sea and have a large swing range. Rolling has a serious impact on the navigation and safety of the ship, and the life and work of the crew. Rolling can not only reduce the stability of the ship, but the severe rolling may also cause the cargo in the cabin to move, which in turn will cause the hull to tilt or even capsize. Shipwrecks caused by severe swaying of shi...

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 and the free surface of any geometric shape, and has the disadvantages of complex calculation methods, heavy calculation workload, and long time-consuming.

In addition, in the stage of ship concept design, it is generally necessary to calculate the seakeeping performance of multiple alternative ship types, and it is often difficult to determine all the ship type parameters and data required for theoretical calculations, which makes it difficult for theoretical calculations to be widely used in ship concepts design phase

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