CONTROL OF SHIP ROLLING PARAMETERS BASED ON ACTIVE TANKS USING THE MATHEMATICAL APPARATUS OF FUZZY LOGIC
DOI:
https://doi.org/10.35546/kntu2078-4481.2025.2.1.17Keywords:
ship roll, roll stabilizer, fuzzy logic, Matlab Simulink, Fuzzy Logic ToolboxAbstract
One of the most common negative phenomena affecting the seaworthiness of a vessel is pitching. Pitching occurs under the influence of variable external factors and significantly affects the conditions of the vessel’s movement. The operation of the propulsion system changes, the resistance to the vessel’s movement increases, and there is a negative physiological effect on the human body. The most negative consequences of pitching are broaching, slamming, and parametric resonance. In some cases, pitching can lead to the death of the vessel.This paper analyzes the main methods and techniques for stabilizing the movement of a vessel. It is noted that the characteristics of stabilizing the movement of a vessel begin to be standardized at the stages of designing a vessel, one of the main aspects of which is the development of technical loading plans. Also, for certain types of vessels, the waterline area is reduced, thereby reducing the value of the moments of force that excite pitching. The use of storm diagrams when choosing certain movement modes can significantly reduce the negative impact of pitching.The main types of passive and active stabilizers used in shipping are considered. These include bilge keels, side steerable rudders, gyroscopic stabilizers, passive and active tanks. Bile keels and side steerable rudders are limited by the vessel design and are not very effective at low speeds. Gyroscopic stabilizers, in addition to their high weight and dimensions, are distinguished by their high cost, which limits their technical use. Passive tanks are effective only with resonant pitching. At the same time, active tanks reduce the pitching amplitude at different frequencies. The main problem with active tanks is the complex control system for their operation in constantly changing external conditions.Based on mathematical modeling, using the fuzzy logic apparatus Matlab Simulink with the Fuzzy Logic Toolbox extension, a control system for the operation of compressor valves has been developed to reduce the negative impact of pitching on the seaworthiness of a vessel. Membership functions of input and output linguistic variables are demonstrated.
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