An analysis method for the mooring force of LNG ships

Abstract

The invention discloses an analysis method of LNG ship mooring force. The method mainly comprises the following steps that the wind area above a ship waterline is calculated; air resistance is calculated according to the wind area and wind speed; water flow resistance is calculated according to the ship draft and water velocity; the space direction of a mooring rope is acquired; the tension of a breast line and a spring line is calculated according to the space direction of the mooring rope, the air resistance and the water flow resistance. According to the analysis method of the mooring force, the operation process is simple, the calculation period is shortened, the calculation cost is reduced, the first proportionality coefficient of the transverse component force and tension of the breast line and the second proportionality coefficient of the longitudinal component force and tension of the spring line can be obtained according to the space directions of different mooring ropes, therefore, the actual tension of the mooring rope on an LNG ship during shore station mooring is obtained according to the air resistance and the water flow resistance borne by the ship, and the calculated mooring rope tension is more accurate.

Description

technical field [0001] The invention relates to the technical field of ship design, in particular to an analysis method for the mooring force of an LNG ship. Background technique [0002] The mooring force of a ship is an important factor in the berthing capacity of a shore station berth. Factors affecting the mooring force include wind, current, etc. The influence of these external forces is transmitted to the berth and the shore station itself through the cable. [0003] For a long time, there have been three theoretical bases for the calculation of ship mooring force: classification society regulations on the calculation of outfitting numbers; OCIMF (Oil Company International Shipping Forum) industry regulations; foreign special calculation programs. [0004] Existing analytical methods have the following deficiencies: [0005] First, in the calculation of the number of outfitting in the rules of the classification society, the wind speed is limited to 25m / s, and the wa...

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Problems solved by technology

[0008] The purpose of the present invention is to overcome the existing disadvantages of complex mooring force calculation process, high calculation cost and inconformity with the actual mooring conditions of shore stations, and to design a mooring force analysis method for large LNG ships

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