KR20170068001A - Propeller Excitation Forces Reduction Device - Google Patents

Propeller Excitation Forces Reduction Device Download PDF

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Publication number
KR20170068001A
KR20170068001A KR1020150174662A KR20150174662A KR20170068001A KR 20170068001 A KR20170068001 A KR 20170068001A KR 1020150174662 A KR1020150174662 A KR 1020150174662A KR 20150174662 A KR20150174662 A KR 20150174662A KR 20170068001 A KR20170068001 A KR 20170068001A
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KR
South Korea
Prior art keywords
propeller
strut
hull
seawater
shape
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KR1020150174662A
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Korean (ko)
Inventor
유재찬
김정해
박준호
박진훈
구승준
Original Assignee
대우조선해양 주식회사
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Priority to KR1020150174662A priority Critical patent/KR20170068001A/en
Publication of KR20170068001A publication Critical patent/KR20170068001A/en

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING 
    • B63B17/00—Vessels parts, details, or accessories, not otherwise provided for
    • B63B17/0081—Vibration isolation or damping elements or arrangements, e.g. elastic support of deck-houses
    • 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

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • Ocean & Marine Engineering (AREA)
  • Exhaust Silencers (AREA)

Abstract

The present invention relates to a propulsion reducing device for a propeller, comprising: a propeller provided at the rear of a hull; A plurality of struts installed between the propeller and the hull; An eutectic structure that is vertically coupled to the inside of the plurality of struts; And a buckling member installed inside the strut so that the ducted structure reciprocates so as to mitigate the transmission pressure to the ship by the fluctuating pressure caused by the rotation of the propeller and the buoyancy generated by the seawater, The struts and the ducted structure are formed into an airfoil shape to increase the thrust efficiency of the propeller and the duct member of the ducted structure is installed adjacent to the propeller and is generated by the propeller It is possible to buffer the excitation force and to freely install the excitation force at the generation site of the excitation force.

Description

Propeller Excitation Forces Reduction Device "

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a propulsion reducing device for a propeller, and more particularly, to a propulsion reducing device for a propeller that prevents a fluctuating pressure of a propeller from being transmitted to a hull.

In general, ships are getting larger and faster in order to transport more cargoes more quickly. Propellers propelling such ships are becoming larger, and the fluid pressure caused by propeller rotation causes the hull vibration to be high due to the impact force on the hull.

These ships generally have a storage tank for storing goods at the center, a storage tank and an engine room at the rear of the storage tank, and a propeller connected to the engine room at the rear of the engine room. At the rear of the propeller is the rudder, which is the steering device of the ship.

When the propeller provided at the rear of the ship rotates in water, the water flows to the propeller blade surface, causing a pressure difference between the front and back surfaces of the propeller blade surface.

The propulsion generated in this way enables the ship to operate in the sea.

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, Noise, etc.).

Especially, 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 increase in excitation force due to such fluctuating pressure, it is necessary to design the shape and size of the propeller blade itself, to improve the shape of the ship rear, to paddle a separate reinforcing material to block noise and vibration, Various methods such as attaching a guide device for guiding the flow of water or reducing the size of the propeller have been tried or applied, but it is difficult to obtain a substantial effect in reducing the exciting force.

On the other hand, the vibration problem including the noise transmitted to the hull due to the fluctuating pressure due to the propeller is increased due to the urgent force, for example, in the case of a ship, such as a cruise ship, This is something to be solved.

In order to prevent vibrations from occurring in the hull due to the increase in excitation force due to the fluctuating pressure generated during the operation of the propeller, a method of forming an air layer on the surface of the hull adjacent to the propeller is under investigation, It is planned to apply. The module that generates the air layer is fixed to the hull so that the bubble is sprayed from the module to form an air layer on the surface of the hull.

However, since it is known that a module for forming an air layer is provided in a fixed form, it is necessary to install an additional module in order to change the location of the air layer on the ship, ).

For example, Patent Document 1 below discloses an apparatus for reducing vibratory excitation force generated by a propeller.

In the apparatus for reducing vibration excitation force generated by a propeller according to Patent Document 1, a seawater inflow pipe is installed at the stern bottom of a ship, and the seawater inflow pipe is provided with a stern- An inlet port is formed on the bottom of the propeller so that seawater introduced from the inlet port is blown to the upper side of the propeller through the seawater inlet pipe to disturb the pressure of seawater caused by rotation of the propeller, As shown in Fig.

The following Patent Document 2 discloses a ship propulsion-reduction type ship.

The ship's propulsion reduction type ship according to the following Patent Document 2 includes a ship having a rear propeller; And an excitation force reduction module for reducing an excitation force toward the hull by forming an air layer for generating a reflected wave on a surface of the hull adjacent to the propeller, As shown in FIG.

Korean Patent Publication No. 10-2011-0045712 (published on May 4, 2011) Korean Patent Publication No. 10-2014-0059463 (published May 16, 2014)

However, in the excitation force reduction apparatus according to the related art, it is difficult to reduce the excitation force generated in the propeller, and the position of the air outlet for supplying the air layer can not be changed, There was a problem.

An object of the present invention is to provide a propulsion reducing device for a propeller which is provided with a reduction device for absorbing a propulsion force between a propeller and a hull to reduce propulsion force.

Another object of the present invention is to provide a propulsion reducing device for a propeller capable of reducing propulsion force of a propeller by absorbing an excitation force generated by a propeller by a shock absorber.

In order to achieve the above object, a propulsion reducing device of a propeller according to the present invention comprises: a propeller provided at the rear of a hull; A plurality of struts installed between the propeller and the hull; An eutectic structure that is vertically coupled to the inside of the plurality of struts; The ducted structure is reciprocally moved along the strut due to the fluctuating pressure generated by the propeller, and the fluctuating pressure is absorbed by the propelled member. The buckling member is installed inside the strut so that the ducted structure reciprocates. .

And the strut is formed in a streamlined shape so as to reduce the resistance of the seawater.

The strut is characterized by having an airfoil shape having thick one side and thin one side so that the resistance of seawater is reduced.

And a guiding member provided between the strut and the ducted structure on the inner surface of the strut so that the ducted structure can smoothly move up and down.

The guide member is made of rubber.

Wherein the ducted structure comprises: a vertical member each reciprocally coupled to the inside of the plurality of struts; And a duct member having an arc shape having a predetermined length to surround an outer side of the propeller at a lower end of the plurality of vertical members and fixed to the lower ends of the plurality of vertical members.

Wherein the vertical member is formed in the same airfoil shape as the strut, and the duct member is an arc-shaped airfoil having a predetermined length.

And the duct member is an asymmetric airfoil.

Wherein the duct member is formed in a gentle convex shape on the upper arc so that the flow velocity of the seawater moved by the propeller is gently moved, Is formed in a more convex circular arc shape as compared with the circular arc shape of FIG.

As described above, according to the propulsion reducing apparatus of the propeller according to the present invention, the fluctuation pressure due to the rotation of the propeller and the excitation force generated by the sea water can alleviate the transmission to the ship, And the duct member of the ducted structure is installed adjacent to the propeller so that the propulsion force generated by the propeller can be reduced. So that the effect of being able to be freely installed at the generation site of the excitation force is obtained.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic view of a propulsion-reducing device of a propeller according to a preferred embodiment of the present invention;
FIG. 2 is an exploded perspective view showing a propulsion reducing device of a propeller according to a preferred embodiment of the present invention, FIG.
FIG. 3 is a perspective view showing a propulsion reducing device of a propeller according to a preferred embodiment of the present invention, FIG.
4 is a cross-sectional view of a propulsion-reducing device of a propeller according to a preferred embodiment of the present invention,
FIG. 5 is a sectional view showing an edged structure of a propulsion reducing device of a propeller according to a preferred embodiment of the present invention. FIG.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT Hereinafter, a propulsion reducing device of a propeller according to a preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 is a schematic view showing a propulsion reducing device for a propeller according to a preferred embodiment of the present invention, FIG. 2 is an exploded perspective view showing a propulsion reducing device of a propeller according to a preferred embodiment of the present invention, FIG. 4 is a cross-sectional view of a propulsion reducing device for a propeller according to a preferred embodiment of the present invention. Referring to FIG.

The propulsion reducing device for a propeller according to a preferred embodiment of the present invention includes a propeller 10 provided at the rear of a hull 1; A plurality of struts 20 installed between the hull 1 and the propeller 10; An eutectic structure (30) vertically coupled to the inside of the plurality of struts (20); And a buffer member 40 installed inside the strut 20 such that the ducted structure 30 is reciprocated.

The apparatus for reducing excitation force of a propeller according to an embodiment of the present invention is provided with an excitation force reduction device 10 between a ship 1 and a propeller 10 so that a fluctuating pressure generated by rotation of the propeller 10 is not transmitted to the ship 1, So that the propulsion force generated by the propeller 10 is not transmitted to the hull 1.

That is, between the hull 1 and the propeller 10, the diaphragm force applied to the hull 1 is reduced by absorbing the fluctuating pressure while being reciprocated by the varying pressure caused by the rotation of the propeller 10.

A propeller 10 for obtaining the propulsion force of the ship is installed on the stern portion of the hull 1 and an excitation force reduction device is installed on the bottom of the hull 1 above the propeller 10.

A propeller (10) is provided at the stern of the hull (1) to provide propulsive force of the hull (1). Since the propeller 10 is a conventional one, a detailed description thereof will be omitted.

A strut 20 is provided in a vertical direction at the bottom of the aft part of the hull 1, and the strut 20 is formed in a streamline shape to reduce the resistance of seawater. That is, in order to reduce the loss of the thrust generated in the propeller 10 by reducing the resistance according to the movement of the hull 1,

The strut 20 may have an airfoil shape with one side being thick and the other side being thinly formed. As shown in FIGS. 2 to 4, the strut 20 is formed so as to be thicker on the bow side and thinner on the stern side so that the resistance of the seawater can be reduced as much as the hull 1 advances.

In addition, the struts 20 are installed on both the left and right sides of the hull 1, respectively. This is for the purpose of being installed so as to receive a fluctuating pressure generated in accordance with the rotation of the propeller 10.

That is, the strut 20 is installed on the left and right sides, respectively, when the propeller 10 is viewed from the aft side toward the aft side.

The strut 20 is made of a metal material so as to have stiffness capable of withstanding the fluctuating pressure generated by the sea water and the propeller 10.

The strut 20 is formed to have a predetermined length so that the ducted structure 30 is adjacent to the propeller 10 and a guide member 21 is formed on the inner surface of the strut 20 in the same shape as the strut 20 Respectively.

The guide member 21 is installed to smoothly move the ducted structure 30. The material of the guide member 21 may be made of a soft rubber material so that smooth movement and watertightness of the ducted structure 30 can be maintained. It may be made of synthetic resin material.

And a ducted structure 30 for absorbing and alleviating the fluctuating pressure of the propeller 10 is installed under the strut 20. The ducted structure 30 includes a vertical member 31 and a duct member 32 installed on the vertical member 31 so as to be reciprocally movable within the strut 20.

The vertical member 31 is formed in the shape of an airfoil like the strut 20 and a duct member 32 is installed in the lower part of the vertical member 31 in a direction corresponding to the circumference of the propeller 10.

The duct member 32 has the same arc shape as the circumferential direction of the propeller 10. The duct member 32 is formed in the same airfoil shape as the strut 20, as in Figs.

This is to smooth the flow of seawater to be moved to the duct member 32 by the propeller 10, thereby reducing the excitation force.

5 is a sectional view showing an edged structure of a propulsion reducing device of a propeller according to a preferred embodiment of the present invention.

As shown in Fig. 5, the duct member 32 formed in an airfoil shape has an asymmetric airfoil shape. This facilitates the flow rate of the sea water moved by the propeller, thereby enhancing the propulsion efficiency of the propeller 10.

The asymmetric duct member 32 is formed in an arc shape having a gentle curvature on the upper surface so as to smoothly move the flow rate of the seawater on the upper side of the hull 1, So as to increase the flow velocity of the seawater moved by the spring force of the spring.

That is, the upper surface (upper portion) of the duct member 32 is formed into a curved surface having a relatively gentle shape, and the lower surface (lower portion) of the duct member 32 is formed into a sharp arc shape having a smaller curvature than the upper surface.

Since the upper surface of the duct member 30 does not need to increase the flow rate of the seawater, the duct member 30 is formed in a relatively gentle stream shape as compared with the lower portion, and the bottom surface of the duct member 30 allows the seawater to pass at a higher flow rate.

The strut 20 is provided with a buffer member 40 for relieving the fluctuating pressure exerted from the edited structure 30 while restoring the educt structure 30 to the propeller 10 side.

The buffer member 40 may be made of elastic spring or rubber or the like and it is sufficient that the educt structure 30 reciprocates while absorbing the load due to the fluctuating pressure applied from the educt structure 30.

The following is a detailed description of the engagement relationship of the propulsion reducing device of the propeller according to the preferred embodiment of the present invention.

The propulsion reducing device of the propeller according to the embodiment of the present invention forms a strut 20 in the form of an airfoil and is made of a metal material having the same rigidity as the hull 1. [

The strut 20 is formed in an hollow hollow shape and an airfoil shape in which the other side is thick while the other side is thin.

This is for reducing the resistance of the hull 1, and it can be formed in a streamline shape which can increase the flow velocity in addition to the airfoil.

A guide member (21) for smoothly reciprocating the ducted structure (30) is provided in the strut (20). The guide member 21 is installed between the strut 20 and the ducted structure 30, and the material thereof is made of soft rubber or synthetic resin. This prevents the seawater from flowing into the strut 20 and prevents noise caused by the contact between the strut 20 and the ducted structure 30 when the ducted structure 30 reciprocates.

The strut 20 is provided with an educt structure 30 which absorbs and alleviates the fluctuating pressure generated by the rotation of the propeller 10. The ducted structure 30 includes a vertical member 31 movably coupled to the inside of the strut 20 and a duct member 32 formed in an arc shape below the vertical member 31.

The duct member 32 is integrally fixed to the bottom surface of the vertical member 31 by welding and fixes the two vertical members 31 to the duct member 32 so as to be firmly attached to the hull 1.

A guide member (21) is provided between the strut (20) and the vertical member (31). The guide member 21 prevents seawater from flowing into the strut 20 while smoothly moving the vertical member 31 and prevents noise from occurring when the vertical member 31 reciprocates.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A method of operating a propulsion reducing device of a propeller according to a preferred embodiment of the present invention will now be described in detail with reference to FIGS. 1 to 5. FIG.

1 to 5, a propulsion reducing device for a propeller according to a preferred embodiment of the present invention is installed between a hull 1 and a propeller 10. A plurality of such propeller excitation force reduction devices may be installed along the longitudinal direction of the propeller 10, and a plurality of propellers 10 and a plurality of shafts supporting the propeller 10 are also installed at predetermined intervals. In other words, it is installed at a position where a fluctuating pressure is largely generated by the propeller 10.

The propeller 10 is rotated by an engine (not shown) of the hull 1 and the propulsion force of the propeller 10 is obtained while the sea water is rotated as the propeller 10 is rotated.

Accordingly, the propeller 10 pushes the seawater along the direction in which the hull 1 wants to travel, and the seawater is pushed in the propelling direction by the rotation of the propeller 10.

Thrust is generated by the rotation of the propeller 10 and different pressures are generated on the front and rear surfaces of the propeller 10. The seawater flowing by the propeller 10 moves toward the hull 1, 1).

The seawater flowing in this way or the excitation force generated by the fluctuating pressure is applied to the outside of the propeller (10). The propulsive force applied to the outside of the propeller 10 is applied to the duct member 32 of the arc-shaped ducted structure 30.

The duct member 32 is lifted toward the ship 1 by the seawater and the fluctuating pressure to absorb the seawater and the fluctuating pressure and the duct member 32 returns to the original position by the elastic force of the buffer member 40 do.

In this manner, the ducted structure 30 absorbs and mitigates the seawater and the fluctuating pressure, so that the exciting force applied to the ship 1 can be reduced.

In addition, since the duct member 32 is formed to be more convex than the upper portion, the seawater transferred to the duct member 32 can be moved more quickly, thereby increasing the propelling efficiency of the propeller 1 .

In addition, as the seawater is retreated more quickly, it is possible to reduce the leaning force applied to the hull 1 from seawater.

Although the present invention has been described in detail with reference to the above embodiments, it is needless to say that the present invention is not limited to the above-described embodiments, and various modifications may be made without departing from the spirit of the present invention.

10: Propeller 20: Strut
21: guide member 30: ducted structure
31: vertical member 32: duct member
40: buffer member

Claims (9)

A propeller provided at the rear of the hull;
A plurality of struts installed between the propeller and the hull;
An eutectic structure that is vertically coupled to the inside of the plurality of struts;
And a buffer member installed inside the strut so that the ducted structure reciprocates,
Wherein the ducted structure reciprocates along the strut due to the fluctuating pressure generated by the propeller, and the fluctuating pressure is absorbed. The method according to claim 1,
Wherein the strut is formed in a streamlined shape to reduce the resistance of the seawater. The method according to claim 1,
Wherein the strut is formed in an airfoil shape having a thickness of one side and a thickness of the other side so as to reduce the resistance of the seawater. The method according to claim 1,
And a guiding member provided between the strut and the ducted structure on the inner surface of the strut so that the ducted structure can smoothly be lifted and lowered. 5. The method of claim 4,
Wherein the guide member is made of a rubber material. The method according to claim 1,
Wherein the ducted structure comprises: a vertical member each reciprocally coupled to the inside of the plurality of struts;
And a duct member having an arc shape having a predetermined length surrounding the outside of the propeller at the lower end of the plurality of vertical members and fixed to the lower ends of the plurality of vertical members. The method according to claim 6,
Wherein the vertical member is formed in the same airfoil shape as the strut,
Wherein the duct member is an arc-shaped airfoil having a predetermined length. 8. The method of claim 7,
Wherein the duct member is an asymmetrically shaped airfoil. 8. The method of claim 7,
Wherein the duct member is formed in a gentle convex shape in an upper arc shape so as to smoothly move the flow rate of seawater moved by the propeller,
Wherein the arc shape of the lower portion is formed in a more convex circular arc shape than that of the upper arc portion so that the flow rate of the sea water moved by the propeller is increased.
KR1020150174662A 2015-12-09 2015-12-09 Propeller Excitation Forces Reduction Device KR20170068001A (en)

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KR1020150174662A KR20170068001A (en) 2015-12-09 2015-12-09 Propeller Excitation Forces Reduction Device

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KR1020150174662A KR20170068001A (en) 2015-12-09 2015-12-09 Propeller Excitation Forces Reduction Device

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KR20170068001A true KR20170068001A (en) 2017-06-19

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