A variable span fin stabilizer for ships

Abstract

The invention discloses a variable chord stabilizer fin for ships, comprising: a fin surface, a fin rotating shaft, a fin surface rotating shaft, a hydraulic cylinder, a hydraulic cylinder support, a fixed shaft, and a protective baffle, and is characterized in that: the fin rotating shaft and the hull The shaft bracket is slidingly connected, the fin surface and the fin shaft are connected through the fin surface rotation shaft, the hydraulic cylinder bracket is fixedly connected with the fin shaft, the hydraulic cylinder is connected with the hydraulic cylinder bracket through a fixed shaft, and the hydraulic cylinder is connected with the fin surface through a fixed shaft to protect the baffle Fixedly connected with the hull plate. It not only takes into account the small aspect ratio fin type required for low / zero speed anti-rolling, but also takes into account the large aspect ratio fin type required for high-speed anti-rolling, so as to improve the flexibility and economy of the fin stabilizer.

Description

technical field [0001] The invention relates to ship outfitting, in particular to variable-spread chord stabilizer fins for ships. Background technique [0002] At present, in order to improve the ship's hull attitude control ability in high sea conditions, one or two sets of fin stabilizers are usually installed in the underwater middle of the main hull, such as figure 1 shown. The fin stabilizer drives the fin surface through the fin shaft, so that the fin surface forms a certain angle of attack with the direction of the water flow, thereby generating a certain lift force on the fin surface. The lift force of the fin surface is multiplied by the distance from the fin surface to the center of gravity of the hull to obtain the hull By adjusting the angle of attack of the fin surface, different anti-rolling moments can be generated to achieve the ability to control the attitude of the hull in the sailing state. In the case of the same fin surface area, the larger the aspect...

AI Technical Summary

Problems solved by technology

Due to the relatively small aspect ratio of the fin surface of the low / zero speed stabilizer fin, the lift coefficient of the fin surface is low. In the case of high speed anti-rolling, in order to generate sufficient anti-rolling moment, it is often only possible to use a large-scale fin surface. When the angle of attack is rotated, the disturbance of the fins against the water flow will be more severe, which will generate additional fluid resistance, which is not conducive to improving the economy of anti-rolling navigation

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