Novel marine rudder capable of reducing vortex-induced vibration

A vortex-induced vibration, marine technology, applied in the direction of rudder steering, etc., can solve the problems of fatigue damage of the rudder stock and rudder structure, large rudder force of the rudder stock, etc., to increase the frequency of vortex shedding, avoid safety hazards, and avoid resonance effect of effect

Pending Publication Date: 2022-01-21
NANTONG COSCO KHI SHIP ENG
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] The main function of the marine rudder is to ensure the maneuverability of the ship during navigation. However, due to the consideration of the rudder effect, some ship types (such as ultra-large container ships) use a fully suspended rudder, which causes the rudder stock to bear a large rudder force; at the same time, When the ship is sailing, the flow around the rudder will form vortex-induced vibration along the side. When the vortex shedding frequency and the natural frequency of the rudder overlap, resonance will occur, and the long-term resonance and vortex-induced force will cause fatigue damage to the rudder stock and rudder structure.

Method used

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  • Novel marine rudder capable of reducing vortex-induced vibration
  • Novel marine rudder capable of reducing vortex-induced vibration
  • Novel marine rudder capable of reducing vortex-induced vibration

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Embodiment

[0034] Please refer to the attached figure 1 -7, the technical problem to be solved in this embodiment is how to reduce resonance and reduce vortex-induced force, so a new type of marine rudder that reduces vortex-induced vibration is provided, and the new type of marine rudder that reduces vortex-induced vibration includes:

[0035] Flat side and zigzag side. The overall three-dimensional shape of the flat side rudder is shown in figure 1 ; For the main size parameters of the two-dimensional cross-section along the figure 2 ; See the overall three-dimensional shape of the zigzag side rudder image 3 ; See Figure 4 for the main parameters of the zigzag trailing edge.

[0036] For flat side rudders, the thickness t of the flat plate is smaller than the thickness T of the side of the small end of the rudder, and the smaller the better, but the strength requirements must be taken into account, and t is not less than 10mm; the length l of the flat plate and the side thickness ...

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Abstract

The invention discloses a novel marine rudder capable of reducing vortex-induced vibration, which is characterized in that a rudder following edge is designed into a flat plate shape or a sawtooth shape, vortexes generated by the flat plate-shaped following edge or the sawtooth-shaped following edge and vortexes generated by a traditional rudder following edge form favorable interference, and vortex intensity and vortex-induced force are reduced; meanwhile, the vortex shedding frequency is improved, the inherent frequency of the rudder is avoided, and finally the resonance effect is prevented. The flat plate-shaped following edge can be welded by adopting three welding methods; the sawtooth-shaped following edge can be manufactured in a flat plate-shaped following edge welding mode and can also be manufactured with the rudder as a whole. The vortex-induced force of the rudder can be reduced, the vortex shedding frequency is improved, the inherent frequency of the rudder is avoided, and therefore structural potential safety hazards caused by resonance to the rudder are reduced.

Description

technical field [0001] The invention relates to the technical field of marine rudders, in particular to a novel marine rudder for reducing vortex-induced vibration. Background technique [0002] The main function of the marine rudder is to ensure the maneuverability of the ship during navigation. However, due to the consideration of the rudder effect, some ship types (such as ultra-large container ships) use a fully suspended rudder, which causes the rudder stock to bear a large rudder force; at the same time, When the ship is sailing, the flow around the rudder will form vortex-induced vibration along the side. When the vortex shedding frequency and the natural frequency of the rudder overlap, resonance will occur, and the long-term resonance and vortex-induced force will cause fatigue damage to the rudder stock and rudder structure. . Therefore, how to avoid resonance and reduce vortex-induced force is of great significance to the safety of the lifting rudder structure. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B63H25/38
CPCB63H25/38
Inventor 谢畅周旭何金伟周兰喜莫中华陆明锋应续华万冬冬
Owner NANTONG COSCO KHI SHIP ENG
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