KR20160000146A - A ship for reducing vibromotive force - Google Patents
A ship for reducing vibromotive force Download PDFInfo
- Publication number
- KR20160000146A KR20160000146A KR1020140077110A KR20140077110A KR20160000146A KR 20160000146 A KR20160000146 A KR 20160000146A KR 1020140077110 A KR1020140077110 A KR 1020140077110A KR 20140077110 A KR20140077110 A KR 20140077110A KR 20160000146 A KR20160000146 A KR 20160000146A
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- KR
- South Korea
- Prior art keywords
- working gas
- receiving membrane
- gas receiving
- propeller
- hull
- Prior art date
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Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
- B63H—MARINE PROPULSION OR STEERING
- B63H1/00—Propulsive elements directly acting on water
- B63H1/02—Propulsive elements directly acting on water of rotary type
- B63H1/12—Propulsive elements directly acting on water of rotary type with rotation axis substantially in propulsive direction
- B63H1/14—Propellers
- B63H1/15—Propellers having vibration damping means
-
- 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
-
- 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
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- Ocean & Marine Engineering (AREA)
- Vibration Prevention Devices (AREA)
Abstract
A propeller cavitation organic exciter-powered vessel is disclosed. In accordance with an aspect of the present invention, there is provided a propeller-cavitation-induced propulsion-reduction vessel comprising: a hull having a propeller; A plurality of working gas receiving membrane pads having working gas pockets sealed in and accommodating a working gas for generating reflected waves for causing a destructive interference phenomenon with incident waves generated when the propeller rotates; And a pad rotation driving unit provided in the hull and coupled to the plurality of working gas receiving membrane pads for rotationally driving the plurality of working gas receiving membrane pads to expose the working gas pockets of the working gas receiving membrane pads to the outside of the hull.
Description
BACKGROUND OF THE
When the propeller provided at the rear of the ship rotates in water, the water flows to the propeller blade surface, causing a difference in hydraulic pressure between the front and back surfaces of the propeller blade surface. The propulsion generated in this way allows the ship to be operated at sea.
On the other hand, when the propeller is operated for the operation of the ship, that is, when the propeller is rotated in water, a fluctuating pressure is generated in the water due to the propeller as the rotating body. The fluctuating pressure thus generated increases the excitation force to the hull, (Including noise).
Particularly, when cavitation occurs in the water by the propeller, vibration of the hull is severely generated because the excitation force is further increased.
This is because when the pressure in the water is low, the gas contained in the water escapes from the water and collects at a low pressure. As a result, bubbles are generated in the water, and when the bubbles reach the high pressure part, Thereby generating a fluctuating pressure.
In order to solve the problem of increased excitation force due to such fluctuating pressure, it is necessary to design the shape and size of the propeller blade itself differently, to improve the shape of the rear of the ship, to attach a separate reinforcing material for preventing noise and vibration, Or by applying various methods such as attaching a guide device for guiding the flow of the water flowing in the propeller, reducing the size of the propeller, or the like. However, it is practically effective to reduce the excitation force it's difficult.
The vibration problem including the noise transmitted to the hull by the propeller is increased when the propeller is operated. For example, when the ship is a cruise ship, such as a cruise ship or a warship, .
Accordingly, the present applicant has filed with the Korean Intellectual Property Office (KIPO) a number of technologies for reducing the excitation force by forming an air layer in the form of an air bubble on the surface of the hull adjacent to the propeller.
However, most of the prior art attempts to use the air layer, including the last-filed technology, require air to be continuously injected using a compressor to form an air layer, so that due to the installation and operation of the compressor and its related components Energy consumption and so on.
Accordingly, it is an object of the present invention to prevent vibrations from occurring in the hull by increasing the excitation force at the time of operation of the propeller while fundamentally preventing the burden of energy consumption due to the installation and operation of the compressor and related parts, A method of applying a working gas containing membrane pad accommodated in one side to a hull can be considered.
However, when such a working gas receiving membrane pad is intended to be applied to the hull, the working gas receiving membrane pads may be damaged, such as tearing, under marine conditions. Even if the working gas receiving membrane pads are damaged, There is a need for a method that allows easy replacement of the membrane pads.
SUMMARY OF THE INVENTION Accordingly, the present invention has been made in view of the above problems, and it is therefore an object of the present invention to provide a propulsion device for a propeller which is capable of preventing a vibration from being generated in a hull by increasing propulsion force during operation of a propeller while fundamentally preventing a burden of energy consumption, And which can easily replace the working gas receiving membrane pads without complicated or laborious work even if the working gas receiving membrane pads are damaged.
According to an aspect of the present invention, there is provided a hull comprising: a hull having a propeller; A plurality of working gas receiving membrane pads including a working gas pocket in which a working gas generating a reflected wave for causing a destructive interference phenomenon with an incident wave generated when the propeller rotates is hermetically sealed; And a pad rotation driving unit which is provided in the hull and is coupled to the plurality of working gas receiving membrane pads and rotationally drives the plurality of working gas receiving membrane pads so that the working gas pockets of the working gas receiving membrane pads are exposed to the outside of the hull, May be provided.
The pad rotation driving unit may include: a pad support for supporting the plurality of working gas receiving membrane pads; A waterproof rotary shaft connected to the pad support to form a rotary shaft of the pad support; And a shaft rotating part connected to the waterproof rotating shaft to rotate the waterproof rotating shaft.
The shaft rotation unit includes: a rotation motor; A driving gear connected to a motor shaft of the rotary motor; And a driven gear coupled to an end of the waterproof rotary shaft and meshing with the drive gear.
And a seawater inflow preventing cover disposed inside the hull to surround the working gas receiving membrane pad to prevent inflow of seawater.
A drain portion may be coupled to a side portion of the cover for preventing seawater inflow.
A detachable lid having a handle may be provided on the cover of the seawater inflow prevention cover.
According to the present invention, it is possible to prevent vibrations from occurring in the hull due to increased propulsive force at the time of operation of the propeller while fundamentally preventing the burden of energy consumption due to the installation and operation of the compressor and related parts. Even if the gas receiving membrane pads are damaged, the working gas receiving membrane pads can be easily replaced without complicated or laborious operations.
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a structural view of a propeller area of a propeller cavitation organic exciter force reduction type ship according to a first embodiment of the present invention; FIG.
FIG. 2 is a schematic view showing an installation structure of a work gas accommodating membrane pad, which is a region A in FIG.
3 is an operation diagram of Fig.
Fig. 4 is a chart for measuring the impedance of water, rubber, and air.
5 is a view for explaining the principle of incident wave and reflected wave.
6 is a view of a working gas receiving membrane pad for illustrating equation (1).
Fig. 7 is a view showing a state where a working gas receiving membrane pad is installed in a region on the upstream side of the propeller, and shows a plurality of variable pressure measuring points.
Figure 8 is a graphical representation of the efficiency of a working gas receiving membrane pad relative to the frequency of the propeller.
Figure 9 is a graph summarizing the results of the 150 Hz band for the working gas receiving membrane pads corresponding to Figure 7;
10 is a view schematically showing an installation structure of a working gas receiving membrane pad in a propeller cavitation organic exciter force reduction type ship according to a second embodiment of the present invention.
In order to fully understand the present invention, operational advantages of the present invention, and objects achieved by the practice of the present invention, reference should be made to the accompanying drawings and the accompanying drawings which illustrate preferred embodiments of the present invention.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. Like reference symbols in the drawings denote like elements.
FIG. 1 is a structural view of a propeller area of a propeller cavitation propellant-reducing type propulsion vessel according to a first embodiment of the present invention. FIG. 2 is a view schematically showing an installation structure of a working gas receiving membrane pad, And Fig. 3 is an operation diagram of Fig.
Referring to these drawings, the propeller cavitation propulsion reduction type ship according to the present embodiment can prevent the burden of energy consumption and the like due to the installation and operation of the related parts including the compressor, It is possible to prevent vibrations from occurring in the
At the rear of the
For reference, the ship to which the present invention is applied may include all of marine vessels, warships, fishing vessels, carriers, drillships, cruise ships, special work ships, and the like, as well as floating marine structures. Therefore, the scope of right of the present embodiment can not be limited to a specific ship.
As described above, when the
The vibration transmitted to the
In other words, the vibrating force is increased due to the fluctuating pressure generated in the water during the operation of the
As will be described in detail below, the working gas receiving
In other words, since the working gas receiving
Therefore, it is possible to fundamentally prevent the burden of installing and operating the compressor and related parts, and energy consumption.
The working gas receiving
In this embodiment, the working gas receiving
And is further augmented with respect to the mounting position of the working gas receiving
The working gas receiving
The working gas accommodating
(Or anode) is attached to the working gas receiving
2 and 3, in the present embodiment, a plurality of working gas receiving
At this time, the working
In this embodiment, the material of the working gas receiving
The
In this embodiment, the
The working
Although the working
As described above, the working
The working gas filled in the working
On the other hand, as described above, since the working
If the working
Therefore, if the
The pad
The pad
The
The waterproof
The
When the
On the other hand, when the work gas accommodating
The
A
A
As a result, when the working gas receiving
Hereinafter, the principle of reducing the exciting force due to the working gas receiving
Fig. 4 is a graph showing impedance of water, rubber and air, Fig. 5 is a view for explaining the principle of an incident wave and a reflected wave, Fig. 6 is a drawing of a working gas receiving membrane pad for explaining [Equation 1] 7 is a view showing a state in which a working gas receiving membrane pad is installed in a region immediately upstream of the propeller, and FIG. 8 is a graph showing the efficiency of the working gas receiving membrane pad based on the frequency of the propeller And FIG. 9 is a graph summarizing the results of the 150 Hz band for the working gas receiving membrane pads corresponding to FIG.
Referring to these drawings, referring first to FIG. 4, an acoustic impedance (which means an acoustical resistance) of rubber, which is a material of the working gas receiving
Typically, when sound waves propagate in a specific medium and a medium having a different impedance is encountered, a transmission phenomenon and a reflection phenomenon occur. Since the impedance of seawater and rubber is similar, only the reflection phenomenon occurs without reflection at the boundary between sea water and rubber.
For example, as shown in FIG. 5, the incident wave generated in the operation of the
I will explain this again. The spherical pressure wave generated by the cavitation during the operation of the
In this case, when the working gas receiving
When the incident wave is formed as a reflected wave that is reflected by the opposite phase and strikes against the air, the reflected wave meets an incident wave incident on the workpiece receiving
As a result, the fluctuating pressure transmitted from the outside of the working gas receiving
On the other hand, such a reduction performance is limited to a specific frequency band of the propeller as shown in the following equation (1).
[Equation 1]
In this case, f is the reduced frequency band of the propeller, ca (= 340m / s) and cw (= 1500m / s) A " and " b " denote the inner diameter and outer diameter of the working gas receiving membrane pads 130a to 130c, respectively, when they are regarded as equivalents.
A model test was carried out to verify these items. That is, as shown in FIG. 7, one working gas receiving
8, the horizontal axis (x axis) indicates the frequency, and the vertical axis (y axis) indicates the amount of increase / decrease after attachment of the work gas accommodating
FIG. 9 summarizes the results of the 150 Hz band. Referring to FIG. 9, the fluctuating pressures at the positions P2, P3 and P4 located outside the working gas receiving
According to the present embodiment having the structure and function as described above, it is possible to prevent vibrations from being generated in the
As a result, it is possible to effectively prevent vibration from being generated in the
In particular, the structure according to the present embodiment is different from the structure of the present embodiment in that the shape and size of the
As described above, according to the present embodiment, it is possible to prevent vibrations from occurring in the hull by increasing the excitation force at the time of operation of the propeller while fundamentally preventing the burden of energy consumption due to installation and operation of the compressor and other related components And can easily replace the working gas receiving
10 is a view schematically showing an installation structure of a working gas receiving membrane pad in a propeller cavitation organic exciter force reduction type ship according to a second embodiment of the present invention.
In the above-described embodiment, the sizes of the working
However, in the case of this embodiment, the sizes of the working
As described above, the working gas receiving
That is, the work gas receiving
For example, in operating a ship, the RPM of the
The structure of the present embodiment as described above can easily replace the working gas receiving
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 invention. Accordingly, such modifications or variations are intended to fall within the scope of the appended claims.
110: Hull 120: Propeller
125: rudder 130: working gas receiving membrane pad
131: Pad body 132: Working gas pocket
150: Pad rotation drive unit 160: Pad support
162: waterproof
164:
164b:
170: Seal inflow preventing cover 172: Drain part
173: handle 174: detachable cover
Claims (6)
A plurality of working gas receiving membrane pads including a working gas pocket in which a working gas generating a reflected wave for causing a destructive interference phenomenon with an incident wave generated when the propeller rotates is hermetically sealed; And
A pad rotation driving unit provided in the hull and coupled to the plurality of working gas receiving membrane pads for rotationally driving the plurality of working gas receiving membrane pads to expose the working gas pockets of the working gas receiving membrane pads to the outside of the hull Includes propeller cavitation, organic propulsion reducing vessel.
The pad rotation driving unit includes:
A pad support for supporting the plurality of working gas receiving membrane pads;
A waterproof rotary shaft connected to the pad support to form a rotary shaft of the pad support; And
And a shaft rotating part connected to the waterproof rotary shaft to rotate the waterproof rotary shaft.
The shaft-
A rotary motor;
A driving gear connected to a motor shaft of the rotary motor; And
And a driven gear coupled to an end of the waterproof rotary shaft and meshing with the drive gear.
Further comprising a seawater inflow preventing cover disposed inside the hull so as to surround the working gas receiving membrane pad to prevent inflow of seawater.
And a drain portion is coupled to a side portion of the seawater inflow prevention cover.
And a detachable lid having a handle is provided on an upper portion of the cover for preventing seawater inflow.
Priority Applications (1)
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KR1020140077110A KR101616415B1 (en) | 2014-06-24 | 2014-06-24 | A ship for reducing vibromotive force |
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KR1020140077110A KR101616415B1 (en) | 2014-06-24 | 2014-06-24 | A ship for reducing vibromotive force |
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KR101616415B1 KR101616415B1 (en) | 2016-04-28 |
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Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH08188192A (en) | 1995-01-10 | 1996-07-23 | Mitsubishi Heavy Ind Ltd | Propeller fluctuating pressure absorbing device for marine vessel |
JP2002264895A (en) * | 2001-03-13 | 2002-09-18 | Ishikawajima Harima Heavy Ind Co Ltd | Side thruster for catamaran |
JP2002264894A (en) * | 2001-03-07 | 2002-09-18 | Ishikawajima Harima Heavy Ind Co Ltd | Bottom structure of stern part |
JP2009274705A (en) | 2008-04-17 | 2009-11-26 | R & D Engineering:Kk | Frictional resistance reduction ship and method for operating the same |
KR20100010353A (en) * | 2008-07-22 | 2010-02-01 | 삼성중공업 주식회사 | Apparatus for opening and closing a side thruster and vessel having the same |
-
2014
- 2014-06-24 KR KR1020140077110A patent/KR101616415B1/en active IP Right Grant
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH08188192A (en) | 1995-01-10 | 1996-07-23 | Mitsubishi Heavy Ind Ltd | Propeller fluctuating pressure absorbing device for marine vessel |
JP2002264894A (en) * | 2001-03-07 | 2002-09-18 | Ishikawajima Harima Heavy Ind Co Ltd | Bottom structure of stern part |
JP2002264895A (en) * | 2001-03-13 | 2002-09-18 | Ishikawajima Harima Heavy Ind Co Ltd | Side thruster for catamaran |
JP2009274705A (en) | 2008-04-17 | 2009-11-26 | R & D Engineering:Kk | Frictional resistance reduction ship and method for operating the same |
KR20100010353A (en) * | 2008-07-22 | 2010-02-01 | 삼성중공업 주식회사 | Apparatus for opening and closing a side thruster and vessel having the same |
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