Method for determining local strength of bottom structure of ship launched from berth

A bottom structure and determination method technology, applied to ship components, ship construction, ships, etc., can solve problems such as easy damage and large structural stress

Active Publication Date: 2014-03-26
DALIAN SHIPBUILDING IND
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Problems solved by technology

The structure is stressed and easily damaged

Method used

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Embodiment Construction

[0024] This calculation method uses a multi-position static calculation method to simulate dynamic launching analysis. It is divided into two steps. In the first step, the overall structure of the ship is simplified into a thin-walled beam with variable cross-section along the length of the ship, which is vertically elastically supported at the pier position. A series of sliding positions are selected as the calculation conditions during the sliding of the berth. Calculate the pier support reaction force value of the hull structure at each pier. Find the positions of the extreme stresses of the structure. In the second step, the local three-dimensional finite element model strength analysis is carried out on the structure at the position of the extreme force, and the area with insufficient structural strength is found. The detailed process is as follows:

[0025] (1). Force analysis of the hull girder of the whole ship

[0026] 1. The ship is supported on the berth by but...

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Abstract

The invention discloses a method for determining the local strength of a bottom structure of a ship launched from a berth. The method is characterized by comprising steps of firstly, simplifying the integral structure of the ship into a variable-cross-section thin-walled beam along the length direction of the ship, perpendicularly flexibly supporting buttresses, selecting a series of gliding positions as working conditions when the ship glides along the berth, acquiring values of buttress reaction force born by the ship structure corresponding to the various buttresses, and determining various stress extreme positions of the structure; secondly, analyzing the strength of the structure corresponding to the stress extreme positions by the aid of a local three-dimensional finite element model, and determining the structural strength of various regions. The method has the advantages that integral ship beam computation is combined with a local three-dimensional finite element model analysis process, so that modeling workload can be greatly reduced as compared with a whole-ship three-dimensional structural finite element modeling analysis process in the prior art, the computation time can be saved, and the analysis speed can be increased.

Description

technical field [0001] The invention relates to the determination of the local strength of the ship when launching from the berth at the stage of ship design, more specifically, the determination of the local strength of the bottom structure of the ship. Background technique [0002] When the ship slipway is launched into the water, the bottom structure is often damaged. If the local strength analysis of the bottom structure is carried out in advance and the area with insufficient strength is found, the structure can be strengthened before launching, or other methods can be used to avoid damage to the bottom structure during launching. If the three-dimensional finite element modeling method of the overall structure of the ship is used to analyze the local strength of the bottom structure, although the accuracy is high, the modeling workload of the model is huge and the time is long. This method is difficult to adopt in the actual ship construction. In reality, the theoretic...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B63B9/06
Inventor 高真所戴挺丛海东姜世跃包岩彭贵胜衣岩
Owner DALIAN SHIPBUILDING IND
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