Damping anti-rolling tank with tunable mass

Abstract

The invention provides a damping type rocking reduction water tank with the tunable mass. The damping type rocking reduction water tank comprises a U-shaped box. A limiting ring is fixedly installed in the horizontal pipe section of the U-shaped box. Horizontal springs are symmetrically arranged on the two sides of the limiting ring. The ends, facing the limiting ring, of the horizontal springs are connected with first mass blocks which can move axially. The other ends of the horizontal springs are connected with the horizontal pipe section. A second mass block and a piston are movably arranged in a vertical pipe section of the U-shaped box. Fixed limiting rings are arranged above and below the piston correspondingly. The second mass block is located above the limiting ring on the upper portion. The upper end of a vertical spring is connected with the second mass block. The lower end of the vertical spring is connected with the vertical pipe section. The outer wall of the second mass block and the inner wall of the vertical pipe section are connected in a sealed manner, and the outer wall of the piston and the inner wall of the vertical pipe section are connected in a sealed manner. The horizontal pipe section and the portion, below the piston, in the vertical pipe section are filled with damping liquid correspondingly. The portion, between the piston and the second mass block,of the vertical pipe section is filled with water. The first mass block is provided with an axial penetration hole. The water tank can achieve efficient rocking reduction in the horizontal directionand the vertical direction at the same time.

Description

technical field [0001] The invention relates to the technical field of vibration control, in particular to a damping anti-rolling water tank with adjustable mass used on a semi-submersible platform. Background technique [0002] Deep-sea semi-submersible platforms usually work thousands of kilometers away from the continental shelf, and their operating conditions are very harsh. How to control large movements such as roll, heave, and pitch is the primary problem in the design of offshore platforms. Aiming at the movement problem of the semi-submersible platform under the excitation of wind, wave and current, the existing anti-rolling methods mainly include fin stabilizers, dynamic shock absorbers, anti-roll water tanks or increasing the counterweight of buoys. Among them, the fin stabilizer technology comes from the ship anti-roll design technology , which is mainly aimed at the control of the ship’s roll, but in the case of low-speed flow, a fin stabilizer with a large fin ...

AI Technical Summary

Problems solved by technology

Aiming at the movement problem of the semi-submersible platform under the excitation of wind, wave and current, the existing anti-rolling methods mainly include fin stabilizers, dynamic shock absorbers, anti-roll water tanks or increasing the counterweight of buoys. Among them, the fin stabilizer technology comes from the ship anti-roll design technology , which is mainly aimed at the control of the ship’s roll, but in the case of low-speed flow, a fin stabilizer with a large fin area is required; the dynamic vibration absorber can effectively control the low-frequency motion of the semi-submersible platform, but for low-frequency large-scale motion, it is necessary to set The vibration absorber with larger mass increases the cost of anti-rolling and raises the center of mass of the platform, which is easy to affect the stability of the platform structure; increasing the counterweight of the buoy can significantly control the heave of the platform, but it has no effect on the control of rotary motions such as roll and pitch. not obvious

Around the anti-rolling problem of ships and platforms, the anti-rolling water tank technology in the prior art has four anti-rolling water wheel ducts arranged on the inner bottom of the ship, and the four anti-rolling water wheel ducts are symmetrically arranged at both ends of the stern, At both ends of the bow, there is an anti-rolling water wheel in each anti-rolling duct. This anti-rolling structure can effectively relieve the rolling, pitching and heaving motion of the ship, but the control target of the anti-rolling structure is the hull structure. It is suitable for the control of superstructure movement of semi-submersible platforms; in the prior art, there are also anti-rolling water tank structures including the main platform of the anti-rolling water tank, platform support structure, outer wall of the anti-rolling water tank, and air passage of the water tank. The reinforcement components in the water tank are reasonably set to reduce the resistance in the water tank, so as to provide sufficient fluid inertia to achieve the anti-rolling function. The disadvantage of this type of anti-rolling water tank is that there are no measures to control the splash on the free surface, and there is no adjustment for its frequency. scope

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