KR20160039048A - Ship including device for reducing a fluctuation pressure induced by propeller - Google Patents

Ship including device for reducing a fluctuation pressure induced by propeller Download PDF

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Publication number
KR20160039048A
KR20160039048A KR1020140131826A KR20140131826A KR20160039048A KR 20160039048 A KR20160039048 A KR 20160039048A KR 1020140131826 A KR1020140131826 A KR 1020140131826A KR 20140131826 A KR20140131826 A KR 20140131826A KR 20160039048 A KR20160039048 A KR 20160039048A
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KR
South Korea
Prior art keywords
propeller
plate member
pressure
fluctuating
reduction device
Prior art date
Application number
KR1020140131826A
Other languages
Korean (ko)
Inventor
김기선
Original Assignee
현대중공업 주식회사
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Publication date
Application filed by 현대중공업 주식회사 filed Critical 현대중공업 주식회사
Priority to KR1020140131826A priority Critical patent/KR20160039048A/en
Publication of KR20160039048A publication Critical patent/KR20160039048A/en

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63H—MARINE PROPULSION OR STEERING
    • B63H5/00—Arrangements on vessels of propulsion elements directly acting on water
    • B63H5/07—Arrangements on vessels of propulsion elements directly acting on water of propellers
    • B63H5/16—Arrangements on vessels of propulsion elements directly acting on water of propellers characterised by being mounted in recesses; with stationary water-guiding elements; Means to prevent fouling of the propeller, e.g. guards, cages or screens
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
    • F16F15/00—Suppression of vibrations in systems; Means or arrangements for avoiding or reducing out-of-balance forces, e.g. due to motion
    • F16F15/02—Suppression of vibrations of non-rotating, e.g. reciprocating systems; Suppression of vibrations of rotating systems by use of members not moving with the rotating systems
    • F16F15/04—Suppression of vibrations of non-rotating, e.g. reciprocating systems; Suppression of vibrations of rotating systems by use of members not moving with the rotating systems using elastic means

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Ocean & Marine Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
  • Aviation & Aerospace Engineering (AREA)
  • Transmission Devices (AREA)

Abstract

According to the present invention, a ship having a fluctuating pressure transmission reduction device comprises: a pressure chamber formed in a stern portion affected by fluctuating pressure generated by rotation of a propeller; and a plate member disposed on one opened side of the pressure chamber and preliminarily deformed in the opposite direction of the fluctuating pressure.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a ship including a variable pressure transmission reduction device,

The present invention relates to a ship having a variable pressure transmission reduction device capable of reducing hull transmission of fluctuating pressure generated by a propulsion device (e.g., a propeller) of a ship.

At the rear of the ship is fitted one or more propulsion devices. The propulsion system is connected with the main engine of the ship and generates propulsion force necessary for the operation of the ship.

One type of propulsion system is a propeller. The propeller rotates at a high speed and generates propulsive force necessary for ship operation. In other words, the propeller forms the pressure difference between the propulsion direction and the propulsion direction of the hull, and generates the propulsion force necessary for the operation of the hull.

On the other hand, the fluctuating pressure generated by the rotation of the propeller is transmitted to the hull, which causes the hull's noise and vibration.

Prior arts for solving these problems are Patent Documents 1 and 2.

Patent Literatures 1 and 2 disclose a technique of generating air bubbles in the vicinity of a propeller 310 by a bubble generator 320 and forming a reflected wave having a phase opposite to a fluctuation pressure generated by the propeller 310, (See FIG. 1).

However, since the natural frequency is formed by the bubble adjacent seawater, which acts as a bubble and mass acting as a rigid body, when the rotational speed of the propeller coincides with the natural frequency, There is a problem that it is amplified and transmitted to the hull. In particular, this phenomenon has a problem of increasing the vibration level and noise level of the ship. In addition, in such a structure, a pneumatic pump necessary for generating bubbles must be installed, which is not economically advantageous.

KR 2013-0038054 A KR 2011-0093570 A

SUMMARY OF THE INVENTION It is an object of the present invention to provide a low-noise, low-noise vessel capable of effectively reducing the propeller fluctuation pressure transmitted to the hull with respect to the entire rotational speed range without a pneumatic pump.

To achieve the above object, according to one aspect of the present invention, there is provided a ship having a variable pressure transmission reduction device, comprising: a pressure chamber formed at a stern portion affected by a fluctuation pressure generated by rotation of a propeller; And a plate member disposed on an open side of the pressure chamber and being pre-deformed in a direction opposite to the fluctuating pressure so as to cancel a fluctuating pressure caused by the propeller.

A ship having a fluctuating pressure transmission reduction device according to an embodiment of the present invention further includes a mass member disposed in the pressure chamber and applying a load to the plate member.

According to another aspect of the present invention, there is provided a variable pressure transmission reduction device comprising: a pressure chamber formed at a stern part affected by a fluctuation pressure generated by rotation of a propeller; A plate member disposed on an open side of the pressure chamber; And one or more spring members which are pre-deformed in the opposite direction of the fluctuating pressure so as to cancel the fluctuating pressure by the propeller.

The variable pressure transmission reduction device according to another embodiment of the present invention further includes a mass member disposed in the pressure chamber and applying a load to the plate member.

In a variable pressure transmission reduction device according to another embodiment of the present invention, the plate member can be pre-deformed in the opposite direction of the fluctuating pressure so as to offset the fluctuating pressure caused by the propeller.

The present invention can effectively reduce the hull transmission of the fluctuating pressure generated by the propulsion device of the ship.

Therefore, according to the present invention, vibration and noise can be reduced with respect to all rotational speeds of the propeller, thereby improving vibration and noise quality of the ship.

1 is a cross-sectional view showing a stern of a ship having a variable pressure reducing device according to the prior art,
2 is a cross-sectional view showing a stern of a ship having a variable pressure transmission reduction device according to an embodiment of the present invention,
Fig. 3 is an enlarged view of a portion A of the fluctuating pressure transmission reduction device shown in Fig. 2,
4 is an enlarged view of a portion A according to another embodiment of the fluctuating pressure transmission reduction device,
5 is an enlarged view of a portion A according to another embodiment of the fluctuating pressure transmission reduction device,
6 is an enlarged view of a portion A according to another embodiment of the fluctuating pressure transmission reduction device.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

In describing the present invention, it is to be understood that the terminology used herein is for the purpose of describing the present invention only and is not intended to limit the technical scope of the present invention.

In addition, throughout the specification, a configuration is referred to as being 'connected' to another configuration, including not only when the configurations are directly connected but also when they are indirectly connected with each other . Also, to "include" an element means that it may include other elements, rather than excluding other elements, unless specifically stated otherwise.

FIG. 1 is a cross-sectional view showing a stern of a ship having a variable pressure reducing device according to the related art, FIG. 2 is a cross-sectional view showing a stern of a ship having a variable pressure transmission reducing device according to an embodiment of the present invention, 3 is an enlarged view of part A of the variable pressure transmission reduction device shown in FIG. 2, FIG. 4 is an enlarged view of part A according to another form of the variable pressure transmission reduction device, and FIG. Fig. 6 is an enlarged view of a portion A according to another embodiment of the fluctuating pressure transmission reduction device.

A ship according to the present embodiment will be described with reference to Fig.

The vessel 10 has a propelling device. For example, one or more propellers (30) are mounted on the stern (20) of a ship (10). The propeller 30 is connected to an engine (not shown) provided inside the ship 10 and rotates as the engine is driven to provide the propulsion required for the operation of the ship 10.

On the other hand, the propeller 30 causes a flow of fluid to the rear of the ship 10 as mentioned in the background, thereby providing a propulsive force and a fluctuating pressure around the propeller 30. The fluctuating pressure transmitted to the hull surface (mainly the upper chamber of the propeller 30) continuously acts during the operation of the vessel 10, so that the vessel 10 can be vibrated or uncomfortable to the occupant of the vessel 10 Causing noise.

The ship 10 according to the present embodiment further includes a fluctuating pressure transmission reduction device 100 to solve this problem.

The detailed configuration of the fluctuating pressure transmission reduction device 100 will be described with reference to Figs. 2 and 3. Fig.

The variable pressure transmission reduction device 100 includes at least one pressure chamber 110 and a plate member 120. The variable pressure transmission reduction device 100 constructed as described above is mounted on the stern 20 of the ship 10. For example, the pressure chambers 110 may be formed at the stern 20 (for example, the upper right portion of the propeller 30) at intervals along the longitudinal direction of the ship 10. Although four pressure chambers 110 are formed in the stern 20 in this embodiment, the number of the pressure chambers 110 is not limited to four. For example, the number of the pressure chambers 110 may be reduced to three or less or five or more.

The pressure chamber 110 is generally formed at a point where a line segment N extending along the radial direction of the propeller 30 meets the hull. That is, it is preferable that the pressure chamber 110 is formed at a portion where the fluctuating pressure by the propeller 30 is the most at the stern 20. However, the forming position of the pressure chamber 110 is not limited to the above-described portion.

The pressure chamber 110 may be formed to be located below the sea level at the stern 20 of the ship 10. [ Such a forming condition may be advantageous in reducing the fluctuating pressure generated by the propeller 30. [

The plate member 120 is disposed in the pressure chamber 110. For example, the plate member 120 may be disposed on one open side of the pressure chamber 110. The plate member 120 may be configured in a pre-deformed state. For example, the plate member 120 may be configured to deform in a direction opposite to the direction of the fluctuating pressure applied to the pressure chamber 110. In one example, the plate member 120 may have a tendency to deform under the pressure chamber 110 (i.e., in the direction of the propeller 30). However, the example deformation direction of the plate member 120 is not limited to the above-described direction. For example, the plate member 120 may be pre-deformed to have a tendency to deform inward of the pressure chamber 110. In another form, the plurality of plate members 120 may be configured to have different exemplary deformations. For example, the plate member 120 disposed in some of the pressure chambers 110 is provided with a predetermined deformation to be deformed in one direction, and the plate member 120 disposed in the other pressure chamber 110 is deformed in the other direction It can be provided with a deformation.

The plate member 120 may be formed to coincide with the surface of the stern 20 in general. For example, the plate member 120 may be formed in a curved shape along the surface shape of the stern 20. However, the shape of the plate member 120 is not limited to the above-described shape. For example, the plate member 120 may be formed in a shape in which the inside of the stern 20 is bent concavely or convexly outwardly of the stern 20 as shown by solid lines or dotted lines in Fig.

The plate member 120 thus configured can reduce the fluctuating pressure transmitted from the propeller 30 to the hull. In one example, the varying pressure transmitted from the propeller 30 to the hull can be reduced or eliminated as it compensates for the deformation of the plate member 120.

Therefore, according to the present embodiment, there is an advantage that the fluctuation pressure caused by the propeller 30 can be effectively reduced without providing a complicated mechanical device in the stern 20.

Next, a fluctuating pressure transmission reduction device according to another embodiment will be described. For reference, the same components as those of the above-described embodiment in the description of the other forms of the fluctuating pressure transmission reduction device use the same reference numerals as those in the above-described embodiment, and detailed description of these components is omitted.

First, another form of the fluctuating pressure transmission reduction device will be described with reference to Fig.

The variable pressure transmission reduction device 100 according to this embodiment further includes a mass member 130. [ For example, plate member 120 may be provided with one or more mass members 130.

The mass member 130 may change the magnitude of the example deformation of the plate member 120. For example, the mass member 130 may be formed in the plate member 120 to increase the magnitude of the example deformation of the plate member 120. [ As another example, the mass member 130 may be configured to generate a pre-strain in the plate member 120. For example, the mass member 130 may be disposed on the plate member 120 such that the plate member 120 has a tendency to bend in one direction (downward in FIG. 4). 4, one mass member 130 is shown disposed on the plate member 120, but it is possible to increase the number of the mass members 130 as needed.

The variable pressure transmission reduction device 100 configured as described above is advantageous in that the size and direction of the pre-deformation of the plate member 120 can be adjusted by using the mass member 130.

Next, another form of the fluctuating pressure transmission reduction device will be described with reference to Fig.

The variable pressure transmission reduction device 100 according to this embodiment can be distinguished from the above-described types in that it includes a spring member 140.

The spring member 140 can change the magnitude of the deformation of the plate member 120. For example, the spring member 140 may be formed on the plate member 120 to increase the magnitude of the deformation of the plate member 120. As another example, the spring member 140 may be configured to generate a pre-strain in the plate member 120. For example, the spring member 140 may be disposed on the plate member 120 such that the plate member 120 has a tendency to bend in one direction (downward in FIG. 5). For reference, although one spring member 140 is shown as being disposed on the plate member 120 in FIG. 5, the number of spring members 140 can be increased as needed.

The variable pressure transmission reduction apparatus 100 configured as described above is advantageous in that the size and direction of the example deformation of the plate member 120 can be adjusted by using the spring member 140.

Another embodiment of the fluctuating pressure transmission reduction device will be described with reference to Fig.

The variable pressure transmission reduction device 100 according to this embodiment can be distinguished from the above-described type in that it further includes the mass member 130 and the spring member 140. [

The mass member 130 and the spring member 140 can change the magnitude of the deformation of the plate member 120. [ For example, the mass member 130 and the spring member 140 may be formed on the plate member 120 to increase the magnitude of the deformation of the plate member 120. As another example, the mass member 130 and the spring member 140 may be configured such that a pre-strain is generated in the plate member 120. For example, the mass member 130 and the spring member 140 may be disposed on the plate member 120 such that the plate member 120 has a tendency to bend in one direction (downward in FIG. 6). 6, one mass member 130 and a spring member 140 are shown as being disposed on the plate member 120. However, if necessary, the number of the mass member 130 and the spring member 140 .

The variable pressure transmission reduction apparatus 100 configured as described above is advantageous in that the magnitude and direction of the deformation of the plate member 120 can be more resiliently adjusted by using the mass member 130 and the spring member 140.

It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit or scope of the inventions And various modifications may be made. For example, various features described in the foregoing embodiments can be applied in combination with other embodiments unless the description to the contrary is explicitly stated.

10 vessels
20 stern
30 Propeller
40 Variable pressure transmission reduction device
50 deck
60 Resistance Reduction Structure
70 Safety Net
110 first pressure chamber
120 2nd pressure chamber 3
130 Piping
132 first piping
134 second piping
140 valves

Claims (5)

A pressure chamber formed in the stern part affected by the fluctuating pressure generated by the rotation of the propeller; And
A plate member disposed on an open side of the pressure chamber and being deformed in a direction opposite to the fluctuating pressure so as to cancel a fluctuating pressure caused by the propeller;
And a variable pressure transmission reduction device. The method according to claim 1,
Further comprising a mass member disposed in the pressure chamber and applying a load to the plate member. A pressure chamber formed in the stern part affected by the fluctuating pressure generated by the rotation of the propeller;
A plate member disposed on an open side of the pressure chamber; And
One or more spring members which are pre-deformed in the opposite direction of the fluctuating pressure so as to cancel the fluctuating pressure by the propeller;
And a variable pressure transmission reduction device. The method of claim 3,
Further comprising a mass member disposed in the pressure chamber and applying a load to the plate member. The method of claim 3,
Wherein said plate member is provided with a fluctuating pressure transmission reduction device which is deformed in the opposite direction of the fluctuating pressure so as to cancel the fluctuating pressure by the propeller.
KR1020140131826A 2014-09-30 2014-09-30 Ship including device for reducing a fluctuation pressure induced by propeller KR20160039048A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
KR1020140131826A KR20160039048A (en) 2014-09-30 2014-09-30 Ship including device for reducing a fluctuation pressure induced by propeller

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
KR1020140131826A KR20160039048A (en) 2014-09-30 2014-09-30 Ship including device for reducing a fluctuation pressure induced by propeller

Publications (1)

Publication Number Publication Date
KR20160039048A true KR20160039048A (en) 2016-04-08

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KR1020140131826A KR20160039048A (en) 2014-09-30 2014-09-30 Ship including device for reducing a fluctuation pressure induced by propeller

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20180071008A (en) 2016-12-19 2018-06-27 한국해양과학기술원 A hull pressure fluctuation reduction method for a ship with twin propellers using propeller rotation angle control
KR20180071016A (en) 2016-12-19 2018-06-27 한국해양과학기술원 A hull pressure fluctuation reduction method for a ship with twin propellers using real-time vibration information and propeller rotation angle control

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20180071008A (en) 2016-12-19 2018-06-27 한국해양과학기술원 A hull pressure fluctuation reduction method for a ship with twin propellers using propeller rotation angle control
KR20180071016A (en) 2016-12-19 2018-06-27 한국해양과학기술원 A hull pressure fluctuation reduction method for a ship with twin propellers using real-time vibration information and propeller rotation angle control
KR101879515B1 (en) * 2016-12-19 2018-07-18 한국해양과학기술원 A hull pressure fluctuation reduction method for a ship with twin propellers using real-time vibration information and propeller rotation angle control

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