Efficient evaluation method for instability motion of damaged ship
A motion equation and damage technology, which is applied to ships and other directions, can solve the problem that the accuracy and efficiency of evaluation are difficult to guarantee at the same time, and achieve the effects of accurate calculation, reduction of simulation times, and independence
Active Publication Date: 2021-06-11
CHINA SHIP SCIENTIFIC RESEARCH CENTER (THE 702 INSTITUTE OF CHINA SHIPBUILDING INDUSTRY CORPORATION)
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[0003] The existing probabilistic evaluation methods need to ensure that the random seed number of each simulation reaches a certain degree of confidence, that is to say, the probability evaluation of a single sea state may need to simulate the motion performance of damaged ships under thousands of random wave sequences to meet the confidence level. Degree requirements, which will result in a comprehensive assessment of the probability of damage needs last month, the accuracy and efficiency of the assessment is difficult to guarantee at the same time
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[0031] The specific embodiments of the present invention will be further described below in conjunction with the accompanying drawings.
[0032] This application discloses an efficient evaluation method for the unstable motion of damaged ships, please refer to figure 1 Shown in the flow chart, the method comprises the steps:
[0033] In step 1, the fluid motion at the damaged port of the damaged ship and the motion of the damaged ship are considered as a whole to construct a time-domain motion model of the damaged ship.
[0034] In this application, on the basis of the hull motion equation of the time-domain motion model of the damaged ship, the water inlet motion parameters including the water inlet quality, the water inlet flow rate and the restoration force generated by the water inlet are also considered in real time. Further, If the equation of motion of the hull is a multi-degree-of-freedom equation of motion, each water entry motion parameter includes its components in...
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The invention discloses an efficient evaluation method for instability motion of a damaged ship, and relates to the technical field of ships. The method comprises the following steps: determining a plurality of mutually independent target wave sea conditions according to a business scene, carrying out numerical simulation based on a constructed damaged ship time domain motion model according to the target wave sea conditions, acquiring a wave time sequence of each target wave sea condition so as to determine a corresponding effective simulation time length, and then according to the effective simulation time length, carrying out numerical simulation based on a damaged ship time domain motion model according to the target wave sea conditions so as to obtain a rolling angle amplitude, and carrying out instability motion evaluation. According to the method, the wave sea conditions are selected for evaluation according to the business scene, the simulation frequency for a single sea condition can be fully reduced, the independence between stability failure events can be ensured, and the method has the advantages of precision and efficiency and is very suitable for evaluating the instability characteristic of the damaged ship in the wave.
Description
technical field [0001] The invention relates to the technical field of ships, in particular to an efficient evaluation method for unstable motion of damaged ships. Background technique [0002] Ships sailing in the actual ocean environment, due to accidents such as collision, grounding, and contact, may cause damage to one or more cabins, resulting in a large amount of water ingress in the cabins, tilting of the hull, and large movements of the hull in waves. If the ship at this time Insufficient dynamic stability, that is, when the restoring moment of the hull is zero or negative when the hull moves in waves, the inclination angle of the hull will become larger and larger, resulting in unstable motion, causing the ship to capsize or sink. Prediction is crucial to the overall design and safe navigation of a ship. [0003] The existing probabilistic evaluation methods need to ensure that the random seed number of each simulation reaches a certain degree of confidence, that i...
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CPCB63B79/20
Inventor 卜淑霞顾民鲁江吴乘胜黄苗苗祁江涛
Owner CHINA SHIP SCIENTIFIC RESEARCH CENTER (THE 702 INSTITUTE OF CHINA SHIPBUILDING INDUSTRY CORPORATION)