KR20060072847A - Barge with hydrofoil skeg at stern rake and hydrofoil skeg thereof - Google Patents

Barge with hydrofoil skeg at stern rake and hydrofoil skeg thereof Download PDF

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Publication number
KR20060072847A
KR20060072847A KR1020040111602A KR20040111602A KR20060072847A KR 20060072847 A KR20060072847 A KR 20060072847A KR 1020040111602 A KR1020040111602 A KR 1020040111602A KR 20040111602 A KR20040111602 A KR 20040111602A KR 20060072847 A KR20060072847 A KR 20060072847A
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KR
South Korea
Prior art keywords
stern
barge
formed
hydrofoil
inclined surface
Prior art date
Application number
KR1020040111602A
Other languages
Korean (ko)
Inventor
노규석
윤희찬
Original Assignee
윤희찬
인하공업전문대학산학협력단
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Application filed by 윤희찬, 인하공업전문대학산학협력단 filed Critical 윤희찬
Priority to KR1020040111602A priority Critical patent/KR20060072847A/en
Publication of KR20060072847A publication Critical patent/KR20060072847A/en

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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B63SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63BSHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING 
    • B63B1/00Hydrodynamic or hydrostatic features of hulls or of hydrofoils
    • B63B1/02Hydrodynamic or hydrostatic features of hulls or of hydrofoils deriving lift mainly from water displacement
    • B63B1/04Hydrodynamic or hydrostatic features of hulls or of hydrofoils deriving lift mainly from water displacement with single hull
    • B63B1/08Shape of aft part
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B63SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63BSHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING 
    • B63B1/00Hydrodynamic or hydrostatic features of hulls or of hydrofoils
    • B63B1/32Other means for varying the inherent hydrodynamic characteristics of hulls
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B63SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63BSHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING 
    • B63B35/00Vessels or similar floating structures specially adapted for specific purposes and not otherwise provided for
    • B63B35/28Barges or lighters
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B63SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63BSHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING 
    • B63B2701/00Building of the ship's hull
    • B63B2701/20Stems and keels; Stern frames; Bossings and struts; Propeller guards
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B63SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63BSHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING 
    • B63B2747/00Arrangements of propellers and other propulsive devices on ships
    • B63B2747/02Propellers driven by outboard motors placed astern or on the sides of the ship
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02TCLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T70/00Maritime or waterways transport
    • Y02T70/10Measures concerning design or construction of watercraft hulls
    • Y02T70/12Improving hydrodynamics of hull
    • Y02T70/127Improving hydrodynamics of hull improving wake pattern
    • Y02T70/128Improving hydrodynamics of hull improving wake pattern reducing the interaction between hull and propeller

Abstract

The present invention relates to a barge having a hydrofoil skeg formed on the stern lake portion and a structure of the hydrofoil skeg, and more particularly, to a stern while the barge is in progress by a horizontal lift generating blade formed symmetrically on the inclined surface of the stern. Barges and hydrofoil scales with hydrofoil skegs formed on the stern rakes to generate drag in the stern to prevent the increase of resistance due to stern trimming and to reduce drag by vertical flow guide vanes formed at the stern and to maintain a stable course. It's about the structure. The barge in which the hydrofoil skeg is formed on the stern lake portion according to the present invention has a wing shape having a camber for generating lift in a barge having an inclined surface at the stern, and is perpendicular to the traveling direction of the barge and at the same time water surface. It is formed extending in a direction parallel to the with respect to the inclined surface of the stern is configured to include at least one horizontal lift generating blades provided at a predetermined distance from the inclined surface.
Barge, Towing, Stern, Slope, Rake, Lift, Hydrofoil, Resist, Skag

Description

Barge with hydrofoil skeg formed on stern lake and hydrofoil skeg structure {BARGE WITH HYDROFOIL SKEG AT STERN RAKE AND HYDROFOIL SKEG THEREOF}

1 is a schematic perspective view of a barge in which a hydrofoil skeg is formed on a stern lake portion according to a preferred embodiment of the present invention;

2 is a side view of a barge in which a hydrofoil skeg is formed on a stern lake unit according to a preferred embodiment of the present invention;

3 is a cross-sectional view showing a cut portion of the III-III portion of FIG.

FIG. 4 is a cross-sectional view illustrating a cut portion of the IV-IV part of FIG. 1.

Figure 5 is a side view schematically showing the lift action in the horizontal lift generating wing of the barge according to the present invention,

6 is a plan view from above of the state of flow below the stern of a barge without hydrofoil skeg,

7 is a plan view from above of a state of flow below the stern of the barge according to the invention,

8 is a plan sectional view showing a pressure state around the vertical flow guide vanes of the barge according to the present invention;

FIG. 9 is a partial plan view showing one type of flow around a vertical flow guide vane in a conventional barge non-lined structure, FIG.

10 is a partial plan view showing one form of flow around a streamlined vertical flow guide vane of a barge according to the present invention;

11 is a schematic side view illustrating a trim phenomenon of a barge, which is a conventional example.

Explanation of the Main References

1: player 2: stern

3: Lake 10: Hydrofoil Skeg

11: vertical guide vane 12: horizontal lift generating vane

The present invention relates to a barge barge formed with a hydrofoil skeg in the stern lake portion and a hydrofoil skeg structure thereof, and more specifically, to generate a lift on the stern part of the barge by a horizontal lift generating blade to trim the stern part. The present invention relates to a barge and a hydrofoil skeg structure in which a hydrofoil skeg is formed at a stern lake portion which minimizes drag control by controlling a fluid flow by a vertical flow guide vane and at the same time maintains a course of a barge.

A barge is a general term for ships carrying cargo in ports, inland seas, and rivers, also called barges. For convenience of handling the cargo, the width and the flat bottom shape are common, and there are two types of self-actuating propellers and ones that are powered by lack of power. Depending on the use, there are barges for general cargo, oil barges, and the like.

11 is a schematic side view illustrating a trim phenomenon of a barge, which is a conventional example. As shown in FIG. 11, conventional barges generally generate a trim phenomenon in which the stern portion sinks more below the water surface than the bow of the barge during towing.

Therefore, the water immersed portion of the barge of the barge increases, the resistance applied to the entire barge increases, so there is a problem that the energy is consumed for the towing and the speed of the towing is also reduced.

In addition, since the fluid flowing along the side of the hull to the rake portion, which is the inclined portion of the stern of the barge during the cruise, a drag force is generated, which causes a problem that the towing efficiency is not good because the resistance increases.

At the time of towing the barge, the stern portion is turned out of the direction of travel, and as a result, the cruise route increases more than the shortest distance, which hinders towing efficiency.

The present invention has been made to solve the above problems of the prior art, the object of the present invention is to generate a lift on the stern portion of the barge by the horizontal lift generating wing to minimize the phenomena of the stern portion and vertical flow guide vane It is to provide a barge and a hydrofoil skg structure in which the hydrofoil skeg is formed in the stern lake portion to control the fluid flow to reduce drag and at the same time maintain the course of the barge stably.

The object of the present invention described above is a barge provided with an inclined surface on the stern, in order to generate lift, the upper and lower sections of the cross section have an asymmetric camber and at the same time perpendicular to the traveling direction of the barge and parallel to the water surface. The barge on which the hydrofoil skeg is formed on the stern rake portion, which is formed to extend by a predetermined length and includes at least one horizontal lift generating blade installed on the inclined surface of the stern at a predetermined distance from the inclined surface. Is achieved.

In order to achieve the above object, between the at least one horizontal lift generating wing and the inclined surface of the stern there is a connection between the at least one horizontal lift generating wing and the inclined surface of the stern and at the same time both sides of the barge run Preferably, at least one vertical flow guide vane having a streamlined symmetrical cross section disposed to face in a direction perpendicular to the direction is further formed.

In addition, in order to achieve the above object, it is preferable that the horizontal lift generating blades are formed in a pair and the pair of horizontal lifting blades are formed to be symmetrical to the left and right sides of the inclined surface of the stern.

In addition, it is preferable that at least one pair of the vertical flow guide vanes are each formed adjacent to both side ends of the inclined surface of the stern.

The object of the present invention is to be formed on the inclined surface of the stern of the barge, having an asymmetric camber on the top and bottom of the cross section for generating lift, in a direction parallel to the water surface and perpendicular to the traveling direction of the barge. At least one horizontal lift generating blade formed to extend by a predetermined length and installed at a predetermined distance from the inclined surface on the inclined surface of the stern; And at least one vertical flow having a streamlined symmetrical cross section connecting between the at least one horizontal lift generating vane and the inclined surface of the stern and at the same time both sides facing the direction perpendicular to the travel direction of the barge. It can also be achieved by a hydrofoil skeg structure formed on the stern lake portion including the guide vane.

Other objects, specific advantages and novel features of the invention will become more apparent from the following detailed description and the preferred embodiments associated with the accompanying drawings.

Hereinafter, with reference to the accompanying drawings will be described in detail with respect to the barge and the structure of the hydrofoil skg structure formed with a hydrofoil skeg in the stern lake portion according to a preferred embodiment of the present invention.

1 is a schematic perspective view of a barge in which a hydrofoil skeg is formed in a stern lake unit according to a preferred embodiment of the present invention, and FIG. 2 is a side view of a barge in which a hydrofoil skeg is formed in a stern lake unit according to a preferred embodiment of the present invention. to be. As shown in Figs. 1 and 2, the barge on which the hydrofoil skeg according to the present invention is formed is particularly applied to a towing barge cruising by a towing without using its own power. The stern 2 of the barge has a rake inclined at a predetermined angle. The rake unit 3 is provided with hydrofoil skeg members 10 that guide the flow of the fluid symmetrically to the left and right, respectively.

Each hydrofoil skeg member 10 is composed of a vertical flow guide vane 11 formed perpendicular to the rake unit 3 and a horizontal lift generating vane 12 formed horizontally in the rake unit 3. .

FIG. 3 is a cross-sectional view illustrating a cut portion of the III-III part of FIG. 1. As shown in Figures 1 and 3, three vertical flow guide blades 11 are formed on each of the left and right sides in this embodiment and are fixed perpendicularly to the surface of the rake section 3. The vertical flow guide blades 11 have a streamline shape in which the upper and lower surfaces are symmetrically formed, and the thickness gradually increases and decreases from the front to the rear. The vertical flow guide vane 11 has the aspect ratio between the longitudinal chord and the transverse span, the barge's operating speed, minimum and maximum draft (ie minimum and maximum dimensions of the ship submerged). And adjust the ratio to maximize the possible amount, taking into account the drainage.

Figure 4 is a cross-sectional view showing a portion cut section IV-IV of Figure 1, Figure 5 is a side view schematically showing the lifting force in the horizontal lift generating wing of the barge according to the present invention. As shown in Figs. 1, 4 and 5, the horizontal lift generating blades 12 are for lift generation and have a wing structure having cambers asymmetrically above and below the cross section, and the rake portion of the stern 2 is shown. (3) It is fixed to the lower end of the vertical flow guide vane 11 fixed to the surface. The horizontal lift generating blades 12 extend in the transverse direction perpendicular to the direction of travel of the barge, and the horizontal lift generating blades 12 are suitable for the fluid entering under the rake section 3. It is formed to have an attack angle. The aspect ratio between the chord and lateral span of the horizontal lift generating wing 12 is appropriate in consideration of major specifications such as draft of the barge, flight speed, drainage, and inclination angle of the rake. Formed in proportions. The angle of attack of the horizontal lift generating wing 12 is also appropriately formed to generate the required lift. That is, the angle of attack of the horizontal lift generating blade 12 may be formed smaller than or equal to the inclination angle of the rake portion.

Hereinafter will be described in detail the action effect of the barge and the hydrofoil skg structure formed with a hydrofoil skeg in the stern lake portion according to a preferred embodiment of the present invention.

Figure 5 is a side view schematically showing the lift action in the horizontal lift generating wing of the barge according to the present invention. As shown in FIG. 5, the water flowing into the rake section 3 of the stern 2 hits the horizontal lift generating vane 12 while the barge according to the present invention is cruising. Since the horizontal lift generating blades 12 have asymmetric cambers on the top and the bottom of the cross section, water flows up and down the horizontal lift generating blades 12, so that the action force due to the pressure difference is applied. That is, this action force includes a lift force which is a component perpendicular to the traveling direction of water incident on the horizontal lift generating vane 12, and a drag that is a component of the traveling direction of water and a resistive force. Among these forces, lift is also composed of a component perpendicular to the barge's direction of travel and a horizontal component coinciding with the barge's direction of travel, and the stern (2) of the barge by the component perpendicular to the barge's direction of travel. This surface rises a certain amount upward. Therefore, the stern (2) part of the barge can prevent the trimming phenomenon that is submerged more deeply in the water than the bow (1) part, and accordingly, the stern (2) part becomes smaller because the stern (2) part is submerged in the water. Since the area hitting this water decreases, the resistance by water generated during cruise of the barge decreases. This means that the energy required to tow the barge is reduced and the towing speed of the barge is also improved.

In addition, the component of force in the same direction as the barge's traveling direction pushes the barge in the advancing direction, thereby reducing the energy required for towing or increasing the towing speed of the barge.

FIG. 6 is a plan view from above of the flow around the rake portion of the stern in a barge without a hydrofoil skeg. FIG. As shown in FIG. 6, when the fluid flowing along both sides of the barge suddenly appears inwardly when facing the rake part 3, the vortex flows into the rake part 3 while entering the inside of the rake part 3. Generate. When such a vortex occurs, the pressure acting on the rake portion 3 of the stern 2 is lowered, and eventually the pressure of the stern 2 of the barge is lower than the pressure of the bow (1). This means that the drag force on the barge that is cruising becomes large.

7 is a plan view from above of the flow state around the rake portion of the stern portion of the barge according to the present invention. As shown in FIG. 7, the barge according to the present invention has fluid flowing along both sides of the barge due to the hydrofoil skeg member 10 formed on the rake portion 3 of the stern 2 to the inside of the rake portion 3. Reduce the amount of entry further. In particular, the outermost vertical flow guide blades 11 maintain the flow direction of the fluid that has been straight to the outside of the barge along the hydrofoil skeg member 10 on both sides of the barge. In other words, it prevents the formation of fluid flow to the center of the hull and helps the fluid flow on the side of the hull to pass to the side of the hull. This minimizes the generation of vortices in the rake section 3 of the stern 2 and thus reduces the drag force acting on the barge.

8 is a plan sectional view showing a pressure state around the vertical flow guide vanes of the barge according to the present invention. As shown in FIGS. 7 and 8, the vertical flow guide blades 11 of the hydrofoil skeg member 10 have a longitudinal direction of the vertical flow guide blades 11 coinciding with the lengthwise direction of the barge. Are arranged symmetrically on the left and right sides of the barge. And since the pressure A of the water between the vertical flow guide vanes 11 is less than the pressure B of the water outside the vertical flow guide vanes 11, it is applied from both outer sides of the vertical flow guide vanes 11. The relatively large water pressure B allows the vertical flow guide vanes 11 to remain in place without being easily shaken. As a result, even if an external force by wind or the like is applied to a portion of the barge above the water surface, the vertical flow guide blade 11 located in the water does not easily shake or leave its position.

Therefore, the stern 2 of the barge towed is prevented from escaping out of the barge direction and the course of the barge remains stable. As a result, the cruise route of the barge is always maintained at the shortest distance intended, reducing the energy required for towing and reducing the towing time.

FIG. 9 is a partial plan view of one type of flow around a vertical flow guide vane of a conventional barge non-wired structure. As shown in FIG. 9, when the vertical flow guide vane 11 formed in the rake portion 3 is non-linear, vortices are generated at one side when the stern 2 of the barge deviates from the traveling direction of the barge. As a result, the drag force acting on the vertical flow guide vane 11 increases. This increases the overall resistance acting on the barge.

10 is a partial plan view showing one form of flow around a streamlined vertical flow guide vane 11 of the barge according to the invention. As shown in FIG. 10, in the barge according to the present invention, even when the stern 2 of the barge is twisted out of the barge direction, the vortex flows on both sides of the flow guide blade because the vertical flow guide blade 11 is streamlined. Rarely occurs. This in turn minimizes the resistance to the barge, thereby improving the towing efficiency of the barge.

In addition, since both sides of the vertical flow guide vane 11 are symmetrical streamlines, when water enters from a direction coinciding with the center line of the vertical flow guide vane 11, the water passing around the vertical flow guide vane 11 is not cut off. And continuously flows, so that no vortex occurs around the vertical flow guide vane 11. At the same time, the vortex generated in the boundary layer of the vertical flow guide vane is peeled off the rear end of the vertical flow guide vane and is pushed to the rear of the vertical flow guide vane 11, thereby improving the propulsion efficiency of the barge and acting on the barge. Resistance decreases.

In the preferred embodiment of the present invention, the number of vertical flow guide vanes 11 is three, but the scope of the present invention is not limited by the number of vertical flow guide vanes 11.

In addition, in the preferred embodiment of the present invention, the hydrofoil skeg member 10 is formed on both sides of the stern 2 and the rake portion 3, respectively, but the present invention is not limited thereto. ) May be formed symmetrically on the rake portion 3.

In addition, in the preferred embodiment of the present invention, the length of the horizontal lift generating blades 12 is formed to match the width of the vertical flow guide blades 11, but the length of the horizontal lifting blades 12 is horizontal lift. Some increase and decrease is possible as long as the function of the generating blade 12 is not impaired.

In the preferred embodiment of the present invention, a barge having a rake portion at the stern 2 has been described as an example of a barge on which a hydrofoil skeg is formed. However, the present invention is not limited thereto, and the barge without the rake portion at the stern 2 may have a structure. Appropriate deformation can be applied and the structure can be applied to various barges with propulsion devices as well as tow barges.

According to the barge and the hydrofoil skeg structure in which the hydrofoil skeg is formed in the stern lake portion according to the present invention having the above-described configuration, the horizontal lift generating blade generates lift and minimizes the phenomenon of the stern trim and reduces the stern trim. Therefore, the area where the stern portion of the barge is submerged in water is reduced, and thus the resistance acting on the barge as a whole is reduced. In other words, the towing horsepower is reduced when the barge is maintained at the same speed, and the towing speed is increased when the same horsepower is used.                     

In addition, the lift generated by the horizontal lift generating vane includes not only a component perpendicular to the barge's direction of travel, but also a horizontal component that is the same as the barge's traveling direction. It is effective to increase the towing speed by pushing forward.

The vertical flow guide vane has the effect of improving the towing efficiency by reducing the resistance acting on the hull by controlling the flow of fluid flowing from the side of the hull to the center of the hull in the stern direction when towing the barge.

Although the present invention has been described in connection with the above-mentioned preferred embodiments, it is possible to make various modifications or variations without departing from the spirit and scope of the invention. Accordingly, the appended claims will cover such modifications and variations as fall within the spirit of the invention.

Claims (5)

  1. In a barge with an inclined surface at the stern,
    In order to generate lift, the upper and lower sections of the cross section have asymmetrical cambers, which are perpendicular to the direction of the barge at the same time and extend in a direction parallel to the water surface, and are inclined to the inclined surface of the stern. A barge having a hydrofoil skeg formed on the stern rake, which includes at least one horizontal lift generating vane installed at a predetermined distance from the photograph surface.
  2. 10. The method of claim 1, wherein between the at least one horizontal lift generating blade and the sloping surface of the stern connects between the at least one horizontal lift generating blade and the sloping surface of the stern and at the same time both sides of the barge run. A barge having a hydrofoil skeg formed at the stern rake, wherein at least one vertical flow guide vane having a streamlined symmetrical cross section disposed to face in a direction perpendicular to the direction is further formed.
  3. The hydrofoil of claim 1, wherein the horizontal lift generating blades are formed in a pair, and the pair of horizontal lifting blades are formed to be symmetrical to the left and right sides of the inclined surface of the stern. Barge with a skeg formed.
  4. 4. The barge of claim 3, wherein at least one pair of the vertical flow guide vanes is formed adjacent to both ends of the inclined surface of the stern, respectively.
  5. It is formed on the inclined surface of the stern of the barge and has an asymmetric camber on the top and bottom of the cross section to generate lift, and extends by a predetermined length in the direction parallel to the water surface and perpendicular to the traveling direction of the barge. At least one horizontal lift generating blade formed on the inclined surface of the stern with a predetermined distance from the inclined surface; And
     At least one vertical flow guide having a streamlined symmetrical cross section that connects between the at least one horizontal lift generating vane and the inclined surface of the stern and at the same time both sides face in a direction perpendicular to the traveling direction of the barge Hydrofoil skeg structure formed on the stern lake portion of the barge containing the blade.
KR1020040111602A 2004-12-24 2004-12-24 Barge with hydrofoil skeg at stern rake and hydrofoil skeg thereof KR20060072847A (en)

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Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20090051010A (en) * 2006-06-19 2009-05-20 반 오싸넨 앤드 어소시에이츠 비.브이. Vessel provided with a foil below the waterline
KR101516206B1 (en) * 2013-11-27 2015-05-04 삼성중공업 주식회사 A ship for improving course-stability
KR20150115239A (en) 2014-04-03 2015-10-14 삼성중공업 주식회사 Offshore structure
KR20160063857A (en) * 2014-11-27 2016-06-07 삼성중공업 주식회사 Towing stability improved floating offshore structure
KR20160109029A (en) 2015-03-09 2016-09-21 선박안전기술공단 A skeg for barge
KR20190093881A (en) 2018-02-02 2019-08-12 삼성중공업 주식회사 Apparatus for maintaining stability of ship
KR20200038644A (en) 2018-10-04 2020-04-14 한국조선해양 주식회사 external force system for floating marine structure
KR20200043120A (en) 2018-10-17 2020-04-27 한국조선해양 주식회사 towing stability system for floating marine structure

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20090051010A (en) * 2006-06-19 2009-05-20 반 오싸넨 앤드 어소시에이츠 비.브이. Vessel provided with a foil below the waterline
KR101516206B1 (en) * 2013-11-27 2015-05-04 삼성중공업 주식회사 A ship for improving course-stability
KR20150115239A (en) 2014-04-03 2015-10-14 삼성중공업 주식회사 Offshore structure
KR20160063857A (en) * 2014-11-27 2016-06-07 삼성중공업 주식회사 Towing stability improved floating offshore structure
KR20160109029A (en) 2015-03-09 2016-09-21 선박안전기술공단 A skeg for barge
KR20190093881A (en) 2018-02-02 2019-08-12 삼성중공업 주식회사 Apparatus for maintaining stability of ship
KR20200038644A (en) 2018-10-04 2020-04-14 한국조선해양 주식회사 external force system for floating marine structure
KR20200043120A (en) 2018-10-17 2020-04-27 한국조선해양 주식회사 towing stability system for floating marine structure

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