KR101824586B1 - Apparatus for reducing wave resistance - Google Patents

Abstract

A wave breaking resistance reducing apparatus is disclosed. A wave breaking resistance reducing apparatus according to an embodiment of the present invention includes a bulb provided at a forward portion of a ship to reduce a wave resistance of the ship under a specific operating condition; An expansion member attached to the bulb and forming an expansion space; A fluid supply part for supplying a fluid to the expansion space such that the expansion member expands; A first sensing unit for sensing the operating condition of the ship; And a control unit that receives the operating condition sensed by the first sensing unit, calculates a predetermined fluid supply amount to reduce the wave resistance of the ship in the received operating condition, and supplies the fluid to the inflated space by the calculated fluid supply amount And a control unit for controlling the fluid supply unit.

Description

{APPARATUS FOR REDUCING WAVE RESISTANCE}

The present invention relates to a wave resistance reducing apparatus.

The bulb of the ship is designed for the purpose of reducing the wave resistance caused by the wave coming from the hull of the ship at the time of the ship's operation, and is widely used in general merchant ships. The bulb is usually constructed so that the resistance to the waves is minimized when the vessel is operated at the full draft and planned speed.

However, recently, most ships are operated under different conditions than those with full draft - plan speed. In most cases, the cargo to be transported is smaller than the maximum capacity that can be loaded on the ship. In many cases, the cargo is operated even when the cargo is not loaded at all depending on the vessel type.

In recent years, most vessels operate at a speed lower than the planned speed depending on the energy consumption rate or the operation schedule. The reason is to reduce the fuel consumption rate and ultimately the fuel cost.

Therefore, the bulb manufactured under the operating conditions with the load draft - plan speed would increase the wave resistance of the ship under different conditions.

An embodiment of the present invention is intended to provide a wave-breaking resistance reducing device capable of effectively reducing the wave-breaking resistance according to the operating conditions.

According to an aspect of the present invention, there is provided a boat comprising: a bulb provided at a forward portion of the ship to reduce a wave resistance of the ship in a specific operating condition; An expansion member attached to the bulb and forming an expansion space; A fluid supply part for supplying a fluid to the expansion space such that the expansion member expands; A first sensing unit for sensing the operating condition of the ship; And a control unit that receives the operating condition sensed by the first sensing unit, calculates a predetermined fluid supply amount to reduce the wave resistance of the ship in the received operating condition, and supplies the fluid to the inflated space by the calculated fluid supply amount And a control unit for controlling the fluid supply unit so as to control the flow rate of the fluid.

The expansion member may be bolted or adhesively bonded to the bulb.

A plurality of elastic supporting members for elastically supporting one surface of the other surface forming the expansion space are disposed in the expansion space, and elastic constants of the plurality of elastic supporting members are made different from each other to realize an expanded shape of the expansion member have.

The inflated space may be divided into a plurality of small spaces, and the inflated shape of the inflating member may be realized by making the thickness of the partitioning walls partitioning the inflating space into the plurality of small spaces different.

The expansion member may be manufactured to have a different thickness for each region to realize the expansion shape of the expansion member.

The particular operating conditions may include light draft and planned line speed.

Wherein the wave-sensing resistance reducing device includes a second sensing unit for sensing an internal pressure of the expansion space, and the control unit is configured to control the sensing value sensed by the second sensing unit based on an internal value of the expansion space corresponding to the calculated fluid supply amount The fluid supply unit can be controlled to maintain the pressure.

According to the embodiment of the present invention, by modifying the expansion shape of the expansion member attached to the bulb according to the operating conditions, the wave resistance of the ship can be effectively reduced.

FIG. 1 is a view illustrating a device for reducing the harmonic wave resistance according to an embodiment of the present invention,
FIG. 2 is a perspective view of a part of the wave-resistance reducing apparatus according to an embodiment of the present invention,
FIG. 3 is a view showing a modification of the attachment method of the expansion member of FIG. 1,
4 is a view for explaining the operation of the wave-resistance reducing apparatus according to an embodiment of the present invention,
Fig. 5 is a view showing a first embodiment of a method for implementing the inflated shape of the expansion member of Fig. 4,
Fig. 6 is a view showing a second embodiment of a method for implementing the expansion shape of the expansion member of Fig. 4,
FIG. 7 is a view showing a third embodiment of a method of implementing the inflated shape of the expansion member of FIG. 4;

BRIEF DESCRIPTION OF THE DRAWINGS The present invention is capable of various modifications and various embodiments, and specific embodiments are illustrated in the drawings and described in detail in the detailed description. It is to be understood, however, that the invention is not to be limited to the specific embodiments, but includes all modifications, equivalents, and alternatives falling within the spirit and scope of the invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. Referring to the accompanying drawings, the same or corresponding components are denoted by the same reference numerals, do.

FIG. 1 is a view showing a device for reducing a wave resistance according to an embodiment of the present invention, and FIG. 2 is a perspective view illustrating a part of a device for reducing a wave resistance according to an embodiment of the present invention.

1 and 2, the wave-resistance reducing apparatus 100 according to the present embodiment includes a bulb 110, an expansion member 120, a fluid supply unit 130, a first sensing unit 140, and a controller 150 ).

The bulb 110 is provided at the forward portion of the ship 10. The bulb 110 can be made to minimize the wave resistance of the ship 10 under certain operating conditions. The operating condition may include at least one of a draft condition and a linear condition.

For example, the specific operating conditions that are the basis for making bulb 110 may include light draft and planned line speed.

The expansion member 120 may be attached to the bulb 110. For example, the expansion member 120 may be attached to the upper surface of the bulb 110.

In one example, the expansion member 120 may be attached to the bulb 110 in an adhesive manner, as shown in FIG. In this case, an adhesive region M provided at the edge of the expansion member 120 can be adhered to the outer surface of the bulb 110.

As another example, the inflation member 120 may be attached to the bulb 110 in a bolting manner, as in FIG. 3 is a view showing a modification of the attachment method of the expansion member. In this case, the bolt B can be coupled to the rim of the expansion member 120 and a sealing member (not shown) for sealing between the expansion member 120 and the outer surface of the bulb 110 can be interposed .

In addition, the expansion member can be attached to the bulb 110 in a variety of ways.

The expansion member (120) forms an expansion space (121). In one example, the inflation space 121 may be formed between the inflation member 120 and the outer surface of the bulb 110 facing the inflation member 120. As another example, the inflation space 121 may be formed in the interior of the inflation member 120.

When the fluid is supplied to the expansion space 121, the expansion member 120 can expand. For example, when fluid is supplied to the inflation space 121, the inflation member 120 may expand toward the water surface from the upper surface of the bulb 110. The expansion shape of the expansion member 120 may vary depending on the amount of fluid supplied to the expansion space 121. [

The expansion member 120 can maintain the overlapping state with the upper surface of the bulb 110 under specific operating conditions that are the design basis of the bulb 110. [ And the expansion member 120 may expand to have an optimized expansion shape to reduce the wave resistance according to the operating conditions. This will be described later.

The fluid supply part 130 supplies fluid to the expansion space 121 of the expansion member 120. The fluid supplied by the fluid supply part 130 may be a gas such as air or a liquid such as water.

For example, when the fluid supplied to the expansion space 121 is air, the fluid supply unit 130 may include an air pump. The air pump pumps air from the air storage tank mounted on the vessel 10 and supplies the air to the expansion member 120.

As another example, when the fluid supplied to the expansion space 121 is water, the fluid supply unit 130 may include a water pump. The water pump pumps water from the water storage tank mounted on the vessel 10 and supplies the water to the expansion member 120.

The first sensing unit 140 senses the operating condition of the ship 10. The first sensing unit 140 may include at least one of a speed sensor for sensing the speed of the ship 10 and a draft sensor for sensing the draft of the ship 10.

For example, the speed sensor may include, but is not limited to, a GPS.

For example, the draft sensor can detect the draft by, for example, inserting a hole in the bottom and installing a pressure sensor, detecting a draft by the water pressure, connecting the pipeline by making a hole in the bottom or the side of the line and applying a floater inside the pipe , You can perforate the bottom or the side of the line, connect the pipeline and sense the draft using ultrasonic waves.

The control unit 150 receives the navigation condition sensed by the first sensing unit 140. The control unit 150 calculates a predetermined fluid supply amount so as to reduce the wave resistance of the ship 10 in the received operating condition.

More precisely, before operating the vessel 10 according to the present embodiment, it is possible to obtain the wave resistance according to the operating conditions of the experimental vessel in advance through simulation (ex. Model test or numerical analysis). In other words, as a result of simulating different drafts and speeds, it is possible to obtain the wave resistance of the ship under various operating conditions.

The optimal expansion shape of the experimental expansion member to reduce the wave resistance by the operating conditions of the experimental vessel can be determined by simulation. When the expansion shape of the experimental expansion member is determined for each operating condition of the experimental vessel, the amount of fluid supply that the experimental expansion member needs to be supplied to the experimental expansion member to have such an expanded shape can be determined.

The amount of fluid supplied to the ship 10 and the expansion member 120 according to the operating conditions of the experimental ship according to the above-described simulation can be practically applied and stored in a separate storage unit in advance.

The control unit 150 can calculate the predetermined fluid supply amount such that the wave resistance of the ship 10 is reduced under the operating conditions received based on the experiment data acquired in advance as described above.

For example, suppose that the received operating conditions are 20 knots at a speed of 20 knots and a draft at 8 meters, and the fluid supply amount corresponding to the condition of 20 knots at a speed of 8 knots and a draft of 8 m at a preliminarily obtained experimental data is 100 liters. At this time, the control unit 150 can calculate the fluid supply amount (100 liters) corresponding to the operating condition by inputting the received operating condition (20 knots at the line speed, 8 meters at the draft) into the experiment data acquired in advance.

4 is a view for explaining the operation of the wave-resistance reducing apparatus according to an embodiment of the present invention. The operation of the wave-resistance reducing apparatus 100 according to the present embodiment will be described below with reference to Figs. 1 and 4. Fig. Referring to FIG. 1, the vessel 10 is operated under specific operating conditions that are the design basis of the bulb 110. For example, the vessel 10 can be operated at light draft and planned line speed.

The control unit 150 receives the navigation condition sensed by the first sensing unit 140 and calculates a predetermined fluid supply amount such that the wave resistance of the ship 10 is reduced under the received navigation conditions.

For example, the predetermined fluid supply amount may be zero in a specific operating condition that is a design basis of the bulb 110. In this case, the control unit 150 does not operate the fluid supply unit 130 to maintain the expansion member 120 in a contracted state. Thus, the expansion member 120 is brought into close contact with the outer surface of the bulb 110, and the wave resistance can be effectively reduced by the bulb 110 under certain operating conditions.

Referring to FIG. 4, the ship 10 is operated at a different operating condition than that of FIG. For example, the ship 10 can be operated at full load and at planned speed.

The control unit 150 receives the navigation condition sensed by the first sensing unit 140 and calculates a predetermined fluid supply amount such that the wave resistance of the ship 10 is reduced under the received navigation conditions. The control unit 150 may control the fluid supply unit 130 to supply the fluid to the inflation space 121 by the calculated fluid supply amount.

In this case, the expansion member 120 can maintain a shape in which the wave resistance of the ship 10 is reduced in the received operation condition, and thus, the wave resistance of the ship 10 can be effectively reduced under the operation conditions.

According to the above-described wave breaking resistance reducing apparatus according to the present embodiment, by changing the expansion shape of the expansion member attached to the bulb according to the operating conditions, the wave resistance of the ship can be effectively reduced.

The apparatus for reducing harmonic wave resistance 100 according to the present embodiment may further include a second sensing unit 160. The second sensing unit 160 senses the internal pressure of the expansion space 121. The second sensing portion 160 may include, but is not limited to, a conventional pressure sensor.

The control unit 150 may control the fluid supply unit 130 to maintain the internal pressure of the inflation space 121 corresponding to the calculated fluid supply amount sensed by the second sensing unit 160. [

In this regard, when the fluid supply amount calculated to reduce the wave resistance in the operating condition received from the first sensing unit 140 is supplied to the expansion member 120, the internal pressure of the expansion space 121 corresponding to the fluid supply amount Can be specified.

In the initial stage of supplying the fluid to the expansion member 120, the internal pressure of the expansion space 121 may have a value corresponding to the fluid supply amount supplied to the expansion space 121.

The control unit 150 may control the internal pressure of the expansion space 121 to be lower than the initial pressure of the expansion space 121 by using the second sensing unit 160. In this case, The fluid supply part 130 may be controlled to maintain the internal pressure so as to further supply the fluid to the expansion space 121. [

Fig. 5 is a view showing a first embodiment of a method for implementing the inflated shape of the expansion member of Fig. 4;

5, in the present embodiment, a plurality of elastic support members 122a, 122b, and 122c may be disposed in the expansion space 121. As shown in FIG. Each of the elastic supporting members 122a, 122b, 122c can elastically support one surface forming the expansion space 121 with respect to the other surface. The elastic support members 122a, 122b, 122c may have a wire or rope shape, but are not limited thereto.

The elastic modulus of the plurality of elastic supporting members 122a, 122b, and 122c is made different from each other, so that the expansion shape of the expansion member 120 can be realized.

For example, the center elastic support member 122a located at the center in FIG. 5 may have a smaller elastic modulus than the other two elastic support members 122b and 122c. In this case, the region elastically supported by the central elastic support member 122a can be expanded more than the other regions.

Fig. 6 is a view showing a second embodiment of a method of implementing the inflated shape of the expansion member of Fig. 4;

Referring to Fig. 6, in this embodiment, the inflation space 121 may be partitioned into a plurality of small spaces 121a, 121b, 121c, and 121d. The expansion space 121 may be partitioned into a plurality of small sizes 121a, 121b, 121c, and 121d by the partition walls 123a, 123b, and 123c. The plurality of small sizes 121a, 121b, 121c and 121d may communicate with each other through the through holes 124a, 124b and 124c formed in the partition walls 123a, 123b and 123c.

The thicknesses of the partition walls 123a, 123b and 123c partitioning the inflation space 121 into a plurality of small spaces 121a, 121b, 121c and 121d are made different from each other so that the inflated shape of the inflating member 120 Can be implemented

For example, the center partition 123a located at the center in FIG. 6 may be formed to be thinner than the remaining partition walls 123b and 123c. In this case, the small spaces 121b and 121c formed around the center partition 123a can be expanded more than the remaining small spaces 121a and 121d.

FIG. 7 is a view showing a third embodiment of a method of implementing the inflated shape of the expansion member of FIG. 4;

Referring to FIG. 7, in the present embodiment, the expanding member 120 may be formed to have a different thickness for each region to realize the expansion shape of the expanding member 120.

For example, in FIG. 7, the expansion member 120 can be made such that the central region has a thinner thickness than the edge region. In this case, the central region of the expansion member 120 can be expanded more than the edge region.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, many modifications and changes may be made by those skilled in the art without departing from the spirit and scope of the invention as defined in the appended claims. The present invention can be variously modified and changed by those skilled in the art, and it is also within the scope of the present invention.

10: Ship
100: Wave Resistance Reduction Device
110: bulb
120: Expansion member
130:
140: first sensing unit
150:
160: second sensing unit

Claims (7)

A bulb provided at the forward portion of the ship to reduce the wave resistance of the ship in a specific operating condition;
An expansion member attached to the bulb and forming an expansion space;
A fluid supply part for supplying a fluid to the expansion space such that the expansion member expands;
A first sensing unit for sensing the operating condition of the ship; And
A control unit that receives the operating condition sensed by the first sensing unit, calculates a predetermined fluid supply amount so as to reduce the wave resistance of the ship in the received operating condition, and supplies the fluid to the inflated space by the calculated fluid supply amount And a control unit for controlling the fluid supply unit,
Wherein a plurality of elastic supporting members for elastically supporting one surface forming the expansion space with respect to the other surface are disposed in the expansion space,
And the elastic modulus of the plurality of elastic support members is made different to realize the expansion shape of the expansion member. A bulb provided at the forward portion of the ship to reduce the wave resistance of the ship in a specific operating condition;
An expansion member attached to the bulb and forming an expansion space;
A fluid supply part for supplying a fluid to the expansion space such that the expansion member expands;
A first sensing unit for sensing the operating condition of the ship; And
A control unit that receives the operating condition sensed by the first sensing unit, calculates a predetermined fluid supply amount so as to reduce the wave resistance of the ship in the received operating condition, and supplies the fluid to the inflated space by the calculated fluid supply amount And a control unit for controlling the fluid supply unit,
Wherein the expansion space is divided into a plurality of small spaces,
And the partitioning walls partitioning the expansion space into the plurality of small spaces are different in thickness to implement the expansion shape of the expansion member. delete 3. The method according to claim 1 or 2,
Wherein the expansion member is bolted or bonded to the bulb. delete 3. The method according to claim 1 or 2,
Wherein said specific operating conditions include light draft and planned line speed. 3. The method according to claim 1 or 2,
And a second sensing unit for sensing an internal pressure of the expansion space,
Wherein,
And controls the fluid supply unit so that the sensed value sensed by the second sensing unit maintains the internal pressure of the expansion space corresponding to the calculated fluid supply amount.

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