KR20150145529A - A ship for reducing vibromotive force - Google Patents

A ship for reducing vibromotive force Download PDF

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Publication number
KR20150145529A
KR20150145529A KR1020140075533A KR20140075533A KR20150145529A KR 20150145529 A KR20150145529 A KR 20150145529A KR 1020140075533 A KR1020140075533 A KR 1020140075533A KR 20140075533 A KR20140075533 A KR 20140075533A KR 20150145529 A KR20150145529 A KR 20150145529A
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South Korea
Prior art keywords
pad
propeller
working gas
hull
receiving membrane
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KR1020140075533A
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Korean (ko)
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KR101616410B1 (en
Inventor
박지환
김윤식
박형길
이정훈
전명호
허갑
김진학
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삼성중공업 주식회사
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    • 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
    • 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 pad body formed on one side of the pad body and adapted to receive reflected waves for generating a destructive interference with an incident wave generated when the propeller rotates, And a working gas receiving membrane pad having a working gas pocket, wherein the working gas pocket comprises a plurality of layers of pouch membranes in which the working gas is received in an isolated manner.

Description

A ship for reducing vibromotive force,

TECHNICAL FIELD The present invention relates to a propeller cavitation organic exciter force reduction type ship, and more particularly, to a propeller cavitation organism excitation force reduction type vessel that can be used immediately without replacement even if a working gas receiving membrane pad is damaged.

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, if the working gas receiving membrane pads are to be applied to the hull, the working gas receiving membrane pads may be damaged due to tearing or the like in the marine condition. Even if the working gas receiving membrane pads are damaged, they can be used for emergency use without replacement .

Prior Art _1; Japanese Patent Application Laid-Open No. 8-188192 Prior Art _2; Japanese Unexamined Patent Application Publication No. 2009-274705

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 to provide a propeller-cavitation-induced vibration reduction type vessel that can be used immediately without replacement even if the working gas receiving membrane pad is damaged.

According to an aspect of the present invention, there is provided a hull comprising: a hull having a propeller; A pad body coupled to the hull adjacent to the propeller; and a work gas generator disposed at one side of the pad body for generating a reflected wave for generating a destructive interference with an incident wave generated when the propeller rotates, And a working gas receiving membrane pad provided with a working gas pouch which is hermetically received, wherein the working gas pouch can be provided with a vessel including a plurality of layers of pouch membranes in which the working gas is received in an isolated manner.

The anti-fouling paint may be applied to the outer surface of the working gas receiving membrane pad.

The material of the working gas receiving membrane pad may be a material whose acoustic impedance is similar to that of water.

The material of the working gas receiving membrane pad may be rubber, and the working gas may be air.

The working gas receiving membrane pads may be arranged between the diameter (D) of the propeller in the forward direction and the diameter (D) of the propeller in the stern direction with respect to the propeller.

The working gas receiving membrane pads may be disposed between the one diameter D of the propeller in the starboard direction and the one diameter D of the propeller in the port direction on the basis of the rotational axis of the propeller.

And a bolt-type pad attaching / detaching / attaching portion for detachably coupling the working gas receiving membrane pad to the hull.

The bolt-type pad attaching / detaching unit is fixed to the hull and includes a pad engaging member into which a pad body hole of the pad body is inserted. A fixing nut fastened to the pad fitting member from the outside of the hull to fix the pad body; A sealing gasket having a gasket hole inserted into the pad engaging member, the sealing gasket being in close contact with the pad engaging member to seal the pad body hole; And a reinforcement plate having a plate hole inserted into the pad engaging member and disposed between the sealing gasket and the fixing nut to reinforce the pad body.

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 pad is damaged, it can be used for emergency without replacement.

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 rear view of the region A of FIG. 1, showing the state where the propeller is not shown.
3 is a cross-sectional view of the region A 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 structural view of a working gas receiving membrane pad region in a propeller cavitation organic exciter force reduction type ship according to a second embodiment of the present invention.
11 is an enlarged structural view of the bolt-type pad attaching / detaching portion.

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 propulsion reduction type ship according to a first embodiment of the present invention. FIG. 2 is a schematic rear view of the area A of FIG. 1, And FIG. 3 is a cross-sectional view of the region A 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 the vibration of the hull 110 from being generated due to the increase of the urging force and even if the working gas bubble 132 of the working gas receiving membrane pad 130 is damaged, And includes a hull 110 and a working gas receiving membrane pad 130 coupled to the hull 110 and having a plurality of layers of pockets 132a and 132b.

At the rear of the hull 110, a propeller 120 for propelling the hull 110 is provided. A rudder 125 for adjusting the traveling direction of the ship is provided around the propeller 120. The rudder 125 may be a normal rudder or a bulb rudder.

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 propeller 120 is operated, that is, when the propeller 120 is rotated in water, a fluctuating pressure is generated in the water due to the propeller 120 as a rotating body. ), Which causes vibration (including noise) in the hull.

The vibration transmitted to the hull 110 may be a serious problem, for example, as a cruise ship or a warship such as a warship, and should be prevented.

In other words, the vibrating force is increased due to the fluctuating pressure generated in the water during the operation of the propeller 120 to prevent the vibration of the hull 110 from being generated. For this purpose, in this embodiment, the working gas receiving membrane pad 130 ) Is applied.

As will be described in detail below, the working gas receiving membrane pad 130 applied to the vessel of the present embodiment has a completely different form from the structures forming the air layer, which is a conventional air bubble shape.

In other words, since the working gas receiving membrane pad 130 applied in the present embodiment is only a structure in which the air is confined, there is no need to install or operate the relevant parts including the compressor which should be used in the past .

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 membrane pad 130 in this role is coupled to the hull 110 adjacent to the propeller 120 as shown in Figure 1 and is connected to the hull 110 as it is generated during rotation of the propeller 120, And has a shape in which a reflected wave is generated to cancel an incident wave, and a working gas is accommodated in one side.

In this embodiment, the working gas receiving membrane pad 130 may be coupled to the wall surface of the hull 110 on the upper side of the propeller 120.

And is further augmented with respect to the mounting position of the working gas receiving membrane pad 130. In this embodiment, the working gas receiving membrane pads 130 are positioned between the 0.5 diameter D of the propeller 120 and the 0.5 diameter D of the propeller 120 in the aft direction with respect to the propeller 120, As shown in FIG. In other words, when the diameter of the propeller 120 is 50 cm, the working gas receiving membrane pad 130 may be disposed between the propeller 120 and the point 25 cm in the aft direction.

The working gas receiving membrane pad 130 is disposed between the one diameter D of the propeller 120 in the starboard direction and the one diameter D of the propeller 120 in the port direction relative to the rotational axis of the propeller 120 . In other words, when the diameter of the propeller 120 is 50 cm, the working gas receiving membrane pad 130 can be disposed between the starboard and the 50 cm point in the port direction with respect to the rotational axis of the propeller 120.

In this position, the working gas receiving membrane pad 130 is coupled to the wall surface of the hull 110 to prevent the hull 110 from being vibrated. Although the drawing shows that the working gas receiving membrane pad 130 is attached to the upper chamber of the propeller 120, the scope of the scope of the present embodiment can not be limited to the drawings.

The working gas receiving membrane pad 130 may be formed on one side of the pad body 131 and may include a pad body 131 detachably coupled to the hull 110, And a working gas pocket 132 in which the working gas is enclosed and accommodated.

In this embodiment, the material of the working gas receiving membrane pad 130 may be rubber, and the working gas may be air.

However, the scope of the rights of the present embodiment is not limited thereto. That is, if the material of the working gas receiving membrane pad 130 is a material similar to rubber, it is sufficient, and the working gas may be applied to various gases as long as it is not a liquid.

The pad body 131 forming the working gas receiving membrane pad 130 is a flat structure made of a rubber material and utilized as a part detachably coupled to the hull 110. [

The pad body 131 may be coupled to the hull 110 through a variety of structures and methods. For example, the pad body 131 can be coupled to the hull 110 in various manners such as a bolt-nut coupling method, a fitting method, and a welding method in which an insert metal plate is welded. Therefore, the scope of the right of the present embodiment can not be limited to the manner in which the pad body 131 is coupled.

In this embodiment, the pad body 131 may have a rectangular shape, but the shape of the pad body 131 may be rectangular, circular, triangular, or the like. Therefore, the right range of the present embodiment can not be limited to the shape of the pad body 131. [

The working gas bag 132 is formed inside the pad body 131 and has a shape swollen to one side of the pad body 131.

Although the working gas pocket 132 has a circular shape in the present embodiment, the shape of the working gas pocket 132 may also be various polygonal shapes such as a triangle shape and a square shape. Therefore, Can not be.

As described above, the working gas bag 132 is filled with air as a working gas.

The working gas filled in the working gas pocket 132 is formed integrally with the working gas receiving membrane pad 130 when the working gas receiving pocket 132 is formed, It does not.

On the other hand, as described above, since the working gas pocket 132 has a rubber material, the working gas pocket 132 of the working gas receiving membrane pad 130 having the rubber material in the marine condition may be damaged, such as tearing.

If the working gas bag 132 is damaged due to tearing or the like, the air inside the working gas bag 132 can escape, so that the effect of the present embodiment can not be provided. Therefore, if the working gas pocket 132 is damaged such as tearing, the working gas receiving membrane pad 130 itself must be replaced. However, since it is difficult to replace the working gas receiving membrane pads 130 during the operation, it is possible to use the working gas receiving membrane pads 130 without replacing them, even if the working gas pouches 132 are damaged due to tearing or the like, .

To this end, the working gas pocket 132 of the working gas receiving membrane pad 130 applied to the present embodiment includes first and second bag membranes 132a and 132b, .

Since the first and second bag films 132a and 132b are manufactured individually though they are different in size, the working gas between the first and second bag films 132a and 132b and the working gas between the pad body 131 and the second bag The working gas between the membranes 132b is isolated from each other.

When the working gas bag 132 has the structure as shown in FIG. 3, even if the first bag film 132a made of rubber is torn and damaged by marine conditions, for example, rocks or floats, the second bag film 132b still exists Accordingly, the working force in the second bag membrane 132b increases the excitation force when the propeller 120 is operated, thereby preventing vibration from occurring in the hull. Therefore, inconvenience and inconvenience of replacing the working gas receiving membrane pads 130 during operation can be avoided.

Although two layers of first and second bag membranes 132a and 132b are formed on the pad body 131 in the figure, it is also possible to form the membranes more than the number of the first and second bag membranes 132a and 132b have.

(Or anode) is attached to the working gas receiving membrane pad 130 to prevent fouling of foreign matter or the like from adhering to the working gas receiving membrane pad 130 during long-time vessel operation. Can be applied.

Hereinafter, the principle of reducing the exciting force due to the working gas receiving membrane pad 130 in which the working gas is hermetically sealed will be described in detail with reference to FIG. 4 to FIG.

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 membrane pad 130 of the present embodiment, , While it is almost infinitely greater than air.

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 propeller 120 passes through the rubber layer, which is the wall surface of the working gas pocket 132, and then flows into the work gas filled in the working gas pocket 132, And is reflected by the phase opposite to the incident wave, that is, it is formed as a reflected wave. This reflected wave causes a destructive interference phenomenon with the incident wave, so that the incident wave generated in the operation of the propeller 120 is canceled. By such a phenomenon, the exciting force is reduced and the occurrence of vibration of the ship 110 can be reduced.

I will explain this again. The spherical pressure wave generated by the cavitation during the operation of the propeller 120, that is, the incident wave, can be propagated omnidirectionally.

In this case, when the working gas receiving membrane pads 130 filled with air are installed on the surface of the hull 110 around the propeller 120, the working gas pockets 132 of the working gas receiving membrane pads 130 The incident incident wave passes through the rubber layer, which is the wall surface of the working gas pocket 132, but is reflected by the working gas filled in the working gas pocket 132, i.e., air, in a phase opposite to that of the incident wave.

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 membrane pad 130, causing a destructive interference phenomenon with the incident wave.

As a result, the fluctuating pressure transmitted from the outside of the working gas receiving membrane pad 130 to the hull 110 is reduced, and when the fluctuating pressure is reduced, the exciting force is reduced. Therefore, 110 are reduced.

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]

Figure pat00001

Here, f is the propeller of a reduced frequency, c a (= 340m / s ) and c w (= 1500m / s), respectively for air and water sound speed ρ a (= 1.02 kg / m 3), ρ w (= 1024kg / m 3 ) denote the density of air and seawater, and a and b mean the inner diameter and outer diameter of the working gas receiving membrane pads 130a to 130c, respectively, when they are regarded as equivalent spheres.

A model test was carried out to verify these items. That is, as shown in FIG. 7, one working gas receiving membrane pad 130 having a reducing effect in the frequency band of 150 Hz is designed (or attached) to the wall surface of the hull 110 on the STBD region side, P2, P3, and P4, as well as vibrations were measured in the transom region, which is a steel plate supporting above the stern of the hull 110. In addition,

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 membrane pad 130 to the workpiece accommodating pad 130. In the vicinity of 135 Hz Work gas accommodating Membrane pads (130) Increase in pressure and vibration after installation Although the increase in pressure and vibration is noticeable, a remarkable reduction effect appears in the vicinity of the design frequency of 150 Hz.

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 membrane pad 130 are reduced by an average of about 70% As a result, the vibration level is also remarkably reduced by 70% or more.

According to the present embodiment having the structure and function as described above, it is possible to prevent vibrations from being generated in the hull 110 by increasing the excitation force at the time of operating the propeller 120, and more particularly, It is possible to fundamentally prevent obstacles such as installation of components and burden of energy consumption due to operation.

As a result, it is possible to effectively prevent vibration from being generated in the hull 110. Thus, for example, in the case of a ship for which a quiet operation is to be premised, such as a cruise ship or a warship, The noise-containing vibration problem can be appropriately solved.

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 blade 120 itself of the propeller 120 are designed differently, the shape of the tail of the ship is improved, a separate reinforcing material for blocking noise and vibration is padded, A method of improving noise and vibration by reducing various loss such as attaching a guide device for guiding the flow of water flowing from the propeller 120 or reducing the size of the propeller 120 Technically differentiated. In addition, since the present technology provides a margin for eliminating the restraint condition of vibration in the propeller design by shielding the excitation force, it is possible to greatly increase the size of the propeller 120, It is expected.

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 be used in an emergency without replacement of the working gas receiving membrane pads 130 even if the working gas pockets 132 of the working gas receiving membrane pads 130 are damaged.

FIG. 10 is a structural view of a working gas receiving membrane pad region in a propeller cavitation organic vacuum degassing vessel according to a second embodiment of the present invention, and FIG. 11 is an enlarged structural view of a bolt type pad attaching / detaching unit.

Referring to these figures, in the case of the present embodiment, the working gas receiving membrane pad 130 also includes a pad body 131 and a working gas pocket 132, And has a multi-film structure of the cap membranes 132a and 132b.

The working gas receiving membrane pad 130 may be detachably coupled to the hull 110 through a bolt coupling structure called a bolt-type pad attach / detach coupling portion 250 as shown in FIGS. Of course, it may be considered to attach and detach the working gas receiving membrane pad 130 to the hull 110 in a magnet attaching manner.

The bolt-type pad detachable engagement portion 250 includes a pad engaging member 251, a fixing nut 252, a sealing gasket 261, and a reinforcing plate 262.

The pad engaging member 251 is a structure fixed to the hull 110. In this embodiment, the pad engaging member 251 is applied as a stud bolt 251 which is welded (W) to the hull 110 and fixed in advance.

At this time, the head 251a of the stud bolt 251 may be exposed to the inner wall surface of the hull 110. The shaft 251b and the head 251a of the stud bolt 251 are both connected to the outer wall of the hull 110 And may be welded (W) to the inner wall. In other words, the stud bolt 251 as the pad engaging member 251 corresponds to a structure pre-fixed to the hull 110 at a predetermined position.

The fixing nut 252 serves to fix the pad body 231 of the work gas receiving membrane pad 230, the sealing gasket 261 and the reinforcing plate 262 in a state where the pad body 231 of the work gas receiving membrane pad 230 is successively fitted to the pad joining member 251 do. The fixing nut 252 is fastened to the pad engaging member 251 at the outside of the hull 110 and attached to the pad body 231, the sealing gasket 261, and the reinforcing plate 262 of the working gas receiving membrane pad 230, As shown in FIG. It is preferable that the fixing nut 252 is applied as a nut having a loosening preventing function that is not loosened.

The sealing gasket 261 has a gasket hole 251a to be inserted into the pad engaging member 251 and closely contacts the pad engaging member 251 to seal the pad body hole 231a. The sealing gasket 261 may be made of a slightly elastic rubber material.

The reinforcing plate 262 has a plate hole 262a to be inserted into the pad engaging member 251 and is disposed between the sealing gasket 261 and the fixing nut 252 to reinforce the pad body 231 .

When the work gas receiving membrane pad 130 is coupled to the hull 110 by using the bolt type pad attaching and detaching unit 250 described above, even if the bottom of the hull 110 is in the water immersed state, the stud bolt 251 The sealing body 231, the sealing gasket 261 and the reinforcing plate 262 are sequentially fitted on the shaft 251a of the shaft 251a and the fixing nut 252 is closed.

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

Claims (8)

A hull with a propeller; And
A pad body coupled to the hull adjacent to the propeller; and a work gas generator disposed at one side of the pad body for generating a reflected wave for generating a destructive interference with an incident wave generated when the propeller is rotated, And a work gas receiving membrane pad having a working gas pocket accommodated therein,
Wherein the working gas pocket comprises a plurality of layers of pouch membranes isolatedly received in the working gas. The method according to claim 1,
And a fouling preventing paint is applied to the outer surface of the working gas containing membrane pad. The method according to claim 1,
Wherein the material of the working gas receiving membrane pad is a material similar to the water impedance of the propeller cavitation organic exciter. The method according to claim 1,
The material of the working gas receiving membrane pad is rubber,
Wherein the working gas is an air propeller. The method according to claim 1,
Wherein the working gas receiving membrane pads are disposed between a diameter (D) of the propeller in the forward direction and a diameter (D) of the propeller in the stern direction with respect to the propeller. The method according to claim 1,
Wherein the working gas receiving membrane pad is disposed between a diameter D of the propeller in the starboard direction and a diameter D of the propeller in the port direction on the basis of the rotation axis of the propeller, Ship. The method according to claim 1,
And a bolt-type pad detachable portion detachably coupling the work gas containing membrane pad to the hull. 8. The method of claim 7,
Wherein the bolt-type pad attaching /
A pad engaging member fixed to the hull and into which a pad body hole of the pad body is inserted;
A fixing nut fastened to the pad fitting member from the outside of the hull to fix the pad body;
A sealing gasket having a gasket hole inserted into the pad engaging member, the sealing gasket being in close contact with the pad engaging member to seal the pad body hole; And
And a reinforcing plate disposed between the sealing gasket and the fixing nut to reinforce the pad body, the plate having a plate hole inserted into the pad engaging member.
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Citations (5)

* Cited by examiner, † Cited by third party
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
JPH1071993A (en) * 1996-08-30 1998-03-17 Mitsubishi Heavy Ind Ltd Vibration control device for marine vessel
JP2002264894A (en) * 2001-03-07 2002-09-18 Ishikawajima Harima Heavy Ind Co Ltd Bottom structure of stern part
JP2009184434A (en) * 2008-02-04 2009-08-20 Sumitomo Heavy Industries Marine & Engineering Co Ltd Method of preventing hull from being stained
JP2009274705A (en) 2008-04-17 2009-11-26 R & D Engineering:Kk Frictional resistance reduction ship and method for operating the same

Patent Citations (5)

* Cited by examiner, † Cited by third party
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
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