An Efficient Method for Evaluating Unsteady Motion of Damaged Ships

Abstract

The invention discloses an efficient evaluation method for the unstable motion of a damaged ship, which relates to the technical field of ships. The method determines several mutually independent target wave sea conditions according to business scenarios, and based on the time domain motion of the damaged ship constructed according to each target wave sea state The model carries out numerical simulation to obtain the wave time series of each target wave sea state, so as to determine the corresponding effective simulation time length, and then carry out numerical simulation based on the time domain motion model of the damaged ship according to the effective simulation time length to obtain the roll angle amplitude Instability motion evaluation, this method selects wave sea conditions for evaluation according to business scenarios, and can fully reduce the number of simulations for a single sea state, and can ensure the independence of stability failure events, which has the advantages of both accuracy and efficiency , which is very suitable for the evaluation of the instability characteristics of damaged ships in waves.

Description

Technical field [0001] The present invention relates to the field of ship technology, in particular a highly efficient damage to the ship's instability motion. Background technique [0002] The ship sailed in the actual marine environment, due to collision, stranding and touch, etc., may cause a single or multiple cabin damage, thereby causing a large amount of water in the cabin, tilting the hull and accompanied by the hull in the wavy, if this time Differential, that is, the hull is constant when the hull moves in the waves, and the hull inclined angle will become larger and larger, resulting in an unstable movement, resulting in the overtime or sinking of the ship, so the wavy is broken. Pre-registration, the overall design and safety navigation of the ship are critical. [0003] At present, existing probabilities need to ensure that the number of random seeds each simulated reach a certain confidence, that is, the probability assessment of a single sea condition may need to s...

AI Technical Summary

Problems solved by technology

[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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