Self-adaptive noise reduction tail shaft bracket

Abstract

The invention discloses a self-adaptive noise reduction stern shaft bracket which is provided with two arms, and each stern shaft bracket arm comprises a movable support arm block, a support arm fixing part connected with a shaft hub, a support arm fixing part connected with a main hull shell, a fixed supporting shaft, a fixed supporting rod, a movable support arm block hydraulic driving mechanism and a skin. The skin covers the movable support arm block, the support arm fixing part connected with the main hull and the hull and the support arm fixing part connected with the hub. The movable support arm block is driven by a movable support arm block hydraulic driving mechanism to rotate around the fixed supporting shaft, and the skin is driven to change the appearance of the support arm. The deflection angle of the tail shaft bracket can be adaptively adjusted at different depths according to the working condition of a ship, self cavitation is reduced, a tail wake flow field is changed, the inflow condition of a propeller is improved, and then the effect of reducing underwater radiation noise of the propeller is achieved. Under the working condition that noise does not need to be reduced, the angle of the stern shaft bracket can be adjusted, incoming flow is rectified, the thrust of a propeller is improved, and the navigational speed is increased.

Description

technical field [0001] The invention relates to the field of hull fluid dynamics, in particular to an adaptive noise reduction stern shaft frame. Background technique [0002] With the development of high-speed and large-scale surface ships, the cavitation problem of the shaft support has gradually attracted attention. After the cavitation of the shaft support occurs, the air content in the water will increase and the flow field in front of the propeller will be disordered. The previous research shows that the cavitation of the shaft bracket not only affects its own performance, but also causes the cavitation of the propeller to occur in advance, and the underwater radiation noise of the propeller has an adverse effect. Because the double-arm bracket is close to the propeller, its cavitation performance will directly affect the inflow field of the propeller, thereby directly affecting the cavitation performance, hydrodynamic performance and stealth performance of the propell...

AI Technical Summary

Problems solved by technology

[0005] At present, for ships equipped with stern shaft frames, almost all of the stern shaft frames are rigidly fixed, and cannot be adaptively adjusted according to the speed of the ship.

The layout and geometric shape of the tail bracket arm are designed for noise reduction and hydrodynamic performance optimization for specific working conditions, and do not have the ability to adapt to multiple working conditions

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