Method for forecasting motion resting period of ship

Abstract

The invention discloses a method for forecasting the motion resting period of a ship, and the method comprises the following steps: S1, data acquisition: obtaining sea surface image data through a stereo vision camera, obtaining a sea wave radar image through a ship-borne maritime radar, converting the sea surface image data into a three-dimensional sea surface terrain through stereo photogrammetry software, and carrying out the data acquisition; obtaining sea wave motion characteristic data through inversion and correction; s2, data sequence processing: combining the sea wave motion characteristic data and the ship motion characteristic parameters into a ship-sea wave motion characteristic duration data sequence according to a time sequence, and performing normalization processing in combination with zoning management; s3, establishing a two-layer long and short term memory (LSTM) neural network model; s4, training and verifying the LSTM neural network model based on a sliding window segmentation method; and S5, predicting a ship motion resting period in a specific sea state through an LSTM neural network model in combination with the ship-sea wave real-time motion feature data sequence. According to the method, the ship motion resting period window can be forecasted.

Description

technical field [0001] The invention relates to the technical field of advanced forecasting of ship motion in open sea areas, in particular to a method for predicting the quiet period of ship motion. Background technique [0002] Quiescent Period (QP) refers to "the time interval during which all movements of the ship are within acceptable limits to perform the required activities". In the NATO standard protocol STANAG 4154, it is stipulated that "the permissible limits of ship motion for performing vertical and short-distance take-off and vertical landing operations are: roll angle (roll) 2.5°, pitch angle (pitch) 1.5°, vertical speed (Vs) 1.0 m / s"; when the attitude of the ship is maintained within this range of motion, it is the resting state that meets the requirements of aircraft landing. The associated operation of the ship platform with other systems requires the duration of the rest period. For example, tasks such as fixed-wing aircraft landing, helicopter takeoff,...

AI Technical Summary

Problems solved by technology

However, in the open sea, under the action of various factors such as currents, weather, and other navigation tools, the wave force encountered by the ship is very complicated. Even an experienced captain sometimes cannot accurately capture the static state of the ship's movement Interest period

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