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Method for determining rectification coefficient of ship body to rudders of double-propeller double-rudder ship

A technology of rectification coefficient and hull, which is applied in electrical digital data processing, special data processing applications, instruments, etc., can solve the problems of determining rectification coefficient and interference of double propellers and double rudder ships, and achieves good engineering results, simple operation, and compensation technology. vacancy effect

Active Publication Date: 2020-11-03
CHINA SHIP SCIENTIFIC RESEARCH CENTER (THE 702 INSTITUTE OF CHINA SHIPBUILDING INDUSTRY CORPORATION)
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Problems solved by technology

The interference of the hull to the rudder is mainly manifested in that the velocity and direction of the incoming flow before the rudder are changed due to the existence of the hull (expressed by the rectification coefficient of the hull to the rudder). At present, there is no rectification method for double-screw and double-rudder ships. coefficient method

Method used

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  • Method for determining rectification coefficient of ship body to rudders of double-propeller double-rudder ship
  • Method for determining rectification coefficient of ship body to rudders of double-propeller double-rudder ship
  • Method for determining rectification coefficient of ship body to rudders of double-propeller double-rudder ship

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Embodiment Construction

[0029] The specific embodiments of the present invention will be further described below in conjunction with the accompanying drawings.

[0030] This application discloses a method for determining the rectification coefficient of the hull to rudder of a ship with two oars and two rudders, please refer to figure 1 Shown in the flow chart, the method comprises the steps:

[0031] Step S1, making a ship model consisting of a hull model and a rudder model of a twin-rudder ship according to the scale, and carrying out an open-water rudder hydrodynamic test on the ship model in the towing pool. During the test, determine the area A of the rudder and the test speed U η and the rudder angle δ during the test η and the normal force F acting on the rudder of the ship model η , thus the normal force coefficient f of the rudder is calculated according to the following formula α for:

[0032]

[0033] Step S2: Carry out manipulative rotary motion restraint model tests on the ship mo...

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Abstract

The invention discloses a method for determining a rectification coefficient of a ship body to rudders of a double-propeller double-rudder ship, relates to the technical field of hydrodynamic force, and aims at the double-propeller double-rudder ship in a laboratory pool environment to obtain rotary motion constraint model test data by carrying out a maneuverability rotary motion constraint modeltest under different test working conditions. The rectification coefficient of the ship body of the double-propeller double-rudder ship in the hydrodynamic interference of the rudder can be determinedby performing data approximation and regression processing on the acquired data, the technical vacancy of the industry is made up, and the method is simple to operate, high in data correlation and good in engineering effect.

Description

technical field [0001] The invention relates to the technical field of hydrodynamics, in particular to a method for determining the rectification coefficient of the hull-to-rudder of a ship with two propellers and two rudders. Background technique [0002] Ship restraint model test is currently the most widely used method to obtain ship hydrodynamic derivatives, that is, to use mechanical constraints to force the ship model to perform prescribed motions, such as linear motion, rotary motion, etc. During the model test, by systematically changing the ship model The motion parameters of the ship model are measured to measure the hydrodynamic force acting on the ship model, so as to obtain the hydrodynamic coefficients. Rotary motion in constrained model test In the constrained model test, the ship model is forced to perform steady rotary motion at a certain angular velocity at a certain radius of gyration and a certain attitude angle, and the hydrodynamic force acting on the h...

Claims

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Application Information

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IPC IPC(8): G06F30/15G06F30/20G06F119/14
CPCG06F30/15G06F30/20G06F2119/14Y02T90/00
Inventor 赵桥生李永成国威肖冬林王习建方田
Owner CHINA SHIP SCIENTIFIC RESEARCH CENTER (THE 702 INSTITUTE OF CHINA SHIPBUILDING INDUSTRY CORPORATION)
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