KR101505461B1 - Apparatus for reducing wave resistance - Google Patents

Abstract

Disclosed is an apparatus to reduce wave resistance. According to an embodiment of the present invention, the apparatus to reduce wave resistance comprises: a bulb on the bow of a ship to reduce wave resistance of the ship on a first operational condition; a fluid injection part to create waves by injecting a fluid from the bulb to the surface of the water; and a control part which stops the operation of the fluid injection part when the ship is running on the first operational condition which operates the fluid injection part to reduce the wave resistance of the ship when the ship is running on a second operational condition different from the first operational condition.

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. Bulbs are typically constructed so that the resistance to the waves is reduced or minimized when the vessel is operated at 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, a bulb provided at a forward portion of the ship so as to reduce the wave resistance of the ship in a first operating condition; A fluid ejecting unit for ejecting a fluid from the bulb to the water surface to generate a wave; And stopping the operation of the fluid jetting unit when the ship is operated in the first operating condition and stopping the operation of the fluid ejecting unit when the ship is operated in a second operating condition different from the first operating condition, And a control section for operating the jetting section.

The waves generated by the fluid ejecting unit can be superimposed on the waves generated by the bulb, thereby reducing the wave resistance of the ship.

The fluid ejection unit includes: a nozzle positioned on an upper surface of the bulb; And a pump for supplying fluid to the nozzle.

The plurality of nozzles may be provided, and the plurality of nozzles may be spaced apart in the longitudinal direction of the bulb.

The control unit may inject the fluid through a nozzle provided at a position corresponding to a position of a wave trough by the bulb in the second operating condition among the plurality of nozzles.

The fluid ejected from the fluid ejecting portion may include water or air.

The control unit may control the fluid injection amount of the fluid ejecting unit in the second operating condition based on the wave resistance data of the ship in terms of operating conditions preliminarily obtained through a model line test or a numerical analysis.

The wave breaking resistance reducing apparatus may further include a wire speed measuring unit for measuring a wire speed of the ship; And a draft measuring unit for measuring the draft of the ship, wherein the control unit can receive the measured values from the wire speed measuring unit and the draft measuring unit and grasp the operating condition of the ship.

According to the embodiment of the present invention, since the bulb is manufactured in accordance with the first operating condition that is expected to be the most frequent, it is effectively reduced in the first operating condition in which the wave resistance of the ship is the most frequent without any special operation. And the operation of the fluid ejection portion can effectively reduce the wave resistance of the ship in the second operating condition different from the first operating condition.

FIG. 1 is a view illustrating a wave resistance reducing apparatus according to an embodiment of the present invention. Referring to FIG.
FIG. 2 and FIG. 3 are views for explaining the operation of the wave-resistance reducing apparatus according to an embodiment of the present invention.

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 illustrating a wave resistance reducing apparatus according to an embodiment of the present invention. Referring to FIG. Referring to FIG. 1, the apparatus for reducing harmonic wave resistance 100 includes a bulb 110, a fluid ejection unit 130, and a control unit 150.

The bulb 110 is provided at the bow 13 of the vessel 10. The bulb 110 is manufactured such that the wave resistance of the ship 10 is reduced or minimized under the first operating condition. The first operating condition is a condition in which the ship 10 is expected to be used most frequently when the ship 10 is manufactured, and is composed of a draft and a line speed.

Such first-flight conditions may be such that other series vessels or similar vessels that are already in service prior to the operation of the vessel 10 can use the conditions that were most frequently operated statistically. This first operating condition may be different from the load draft-planned flow rate, which was a standard in manufacturing the bulb 110, and may be determined by economic reasons such as the fuel consumption rate.

For example, if the other ships 10 are operated most frequently at light draft-low speed because of fuel consumption rate or the like, the first operation condition applied to the ship 10 may be a light-water draft-low speed operation condition.

For reference, the ship 10 is classified into a low speed, a medium speed and a high speed so that the ship 10 is operated with any one of them, and the planned speed of the ship 10 is classified as high speed.

The fluid ejection unit 130 ejects the fluid from the bulb 110 to the water surface. The fluid sprayed to the surface of the water lifts the surface of water and forces waves. The process of forcibly reducing the wave resistance by the wave generated by the fluid jetting unit 130 will be described later.

The fluid ejected from the fluid ejecting unit 130 may include water or air.

The fluid injecting unit 130 may include a nozzle 131 and a pump 133. The nozzle 131 is located on the upper surface of the bulb 110. The fluid ejected from the nozzle 131 is directed to the water surface. A plurality of nozzles 131 may be provided and a plurality of nozzles 131 may be spaced apart along the longitudinal direction of the vessel 10. The nozzle 131 may be provided with a valve (not shown) for opening and closing the nozzle 131.

The pump 133 supplies the fluid to the nozzle 131. The pump 133 pumps the fluid from the fluid storage tank 135 located inside the vessel 10 and supplies the fluid to the nozzle 131.

Alternatively, the pump 133 may supply fluid, e.g., seawater or air, outside the vessel 10 directly to the nozzle 131 without the fluid storage tank 135 located within the vessel 10.

The controller 150 controls the fluid injector 130. The control unit 150 stops the operation of the fluid ejection unit 130 when the ship 10 is operated in the first operating condition and controls the wave generating resistance of the ship 10 when the ship 10 is operated in the second operating condition The fluid injecting section 130 is operated so as to be reduced or minimized.

Here, the second operating condition is different from the first operating condition, and is variable in the course of operating the actual ship 10. The second operating condition is composed of the draft and the line speed as in the first operating condition.

For example, when the ship 10 is loaded at high speed and is loaded at high speed, the second operating condition can be achieved at the load draft-high speed. Or when the ship 10 is operating at a high speed in a collinear state in which all of the load is unloaded, the second operating condition may be at a light draft speed. It is needless to say that various types of second operating conditions can be made.

The control unit 150 controls the fluid injection amount of the fluid injecting unit 130 under the second operating condition based on the wave resistance data for each operating condition of the ship 10.

For example, before the ship 10 is operated, it is possible to obtain the wave resistance according to the operating conditions of the ship 10 by a model line test or a numerical analysis in advance. The wave resistance can be obtained according to various operating conditions by varying draft and line speed.

The control unit 150 determines the amount of fluid injection required to reduce or minimize the resistance of the ship 10 in the second operating condition based on the wave resistance data of the operating conditions obtained by the model line test or the numerical analysis, And controls the fluid ejection unit 130 so that the fluid ejection amount is ejected.

The apparatus for reducing harmonic wave resistance 100 according to the present embodiment further includes a line speed measuring unit 160 and a draft measuring unit 170. The wire speed measuring unit 160 measures the wire speed of the ship 10 and may include a GPS.

The draft measuring unit 170 measures the draft of the ship 10. For example, the draft measuring unit 170 may be provided with a pressure sensor to measure a draft by providing a pressure sensor at the bottom of the bottom, or a hole is formed at the bottom or the side of the line, a pipeline is connected, Measure, drill holes on the bottom or side of the line, connect the pipeline and measure the draft using ultrasonic waves

The control unit 150 receives the measured values from the wire speed measuring unit 160 and the draft measuring unit 170 and grasps the operating conditions of the ship 10. The control unit 150 recognizes the operating condition that the ship 10 is currently operating, that is, the second operating condition, based on the measured values received from the wire speed measuring unit 160 and the draft measuring unit 170.

FIG. 2 and FIG. 3 are views for explaining the operation of the wave-resistance reducing apparatus according to an embodiment of the present invention. Hereinafter, the operation of the wave-resistance reducing apparatus 100 according to the present embodiment will be described with reference to Figs. 2 and 3. Fig.

First, referring to FIG. 2, the ship 10 is operated under the first operating condition. In this case, the wave height of the wave A generated by the bulb 110 manufactured in the optimized shape under the first operating condition is reduced or minimized, and accordingly, the wave resistance of the ship 10 is reduced or reduced It becomes the minimum. In this case, since it is not necessary to inject the fluid in the fluid injecting unit 130, the control unit 150 stops the operation of the fluid injecting unit 130.

Referring to FIG. 3, when the ship 10 is operated in the second operating condition, the wave height of the wave B generated by the optimized bulb 110 in the first operating condition is increased, ) Increases.

The control unit 150 receives the measured values from the yaw rate measuring unit 160 and the draft measuring unit 170 and grasps the second operating condition of the present vessel 10. The control unit 150 determines the fluid injection amount required to reduce or minimize the wave resistance of the ship 10 in the second operating condition based on the wave resistance data of the operating conditions obtained by the model line test or the numerical analysis And controls the fluid ejection unit 130 so that the fluid ejection amount is ejected.

3, the fluid injected by the fluid injector 130 generates a convex wave at the trough of the wave B by the bulb 110 under the second operating condition. Thus, the wave generated by the fluid jetting unit 130 overlaps and attenuates the wave B caused by the fluid bulb 110. Therefore, in the second operating condition, the operation of the fluid injecting section 130 reduces or minimizes the wave resistance of the ship 10.

The wave breaking resistance reducing apparatus 100 according to this embodiment operates in such a manner that the bulb 110 is manufactured in accordance with the first operating condition that is expected to be the most frequent, And effectively reduces in frequent first operating conditions. Furthermore, the operation of the fluid injector 130 can effectively reduce the wave resistance of the ship 10 in the second operating condition different from the first operating condition.

Referring to FIG. 3, the position of the trough of the wave B generated by the bulb 110 is changed according to the second operating condition. In this case, the control unit 150 injects the fluid through the nozzle provided at a position corresponding to the valley of the wave B by the bulb 110 among the plurality of nozzles 131 spaced longitudinally in the bulb 110 , Thereby reducing or minimizing the wave-resistance of the ship (10). In this case, it is possible to effectively reduce the wave-resistance of the ship 10 in accordance with the variable second operating condition.

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 reducing device
110: bulb 130: fluid ejection part
131: nozzle 133: pump
135: fluid storage tank 150:
160: line speed measuring unit 170: draft measuring unit

Claims (8)

A bulb provided at the forward portion of the ship so as to reduce the wave resistance of the ship in the first operating condition;
A fluid ejecting unit for ejecting a fluid from the bulb to the water surface to generate a wave; And
The operation of the fluid ejection portion is stopped when the ship is operated in the first operation condition and the operation of the fluid ejection portion is stopped so that when the ship is operated in the second operation condition different from the first operation condition, And a control unit for activating the unit,
The fluid ejecting apparatus according to claim 1,
A nozzle positioned on an upper surface of the bulb; And
And a pump for supplying fluid to the nozzle,
The nozzles are provided in plural,
The plurality of nozzles being spaced apart in the longitudinal direction of the bulb,
Wherein,
And spraying the fluid through a nozzle provided at a position corresponding to a position of a wave trough by the bulb in the second operating condition among the plurality of nozzles. The method according to claim 1,
The wave generated by the fluid jetting unit is transmitted to the fluid-
And the wave breaking resistance of the ship is reduced by overlapping with waves caused by the bulb. delete delete delete The method according to claim 1,
Wherein the fluid ejected from the fluid ejection portion comprises water or air. Wave breaking resistance reduction device. The method according to claim 1,
Wherein,
Wherein the control unit controls the fluid injection amount of the fluid ejection unit in the second operating condition based on the wave resistance data for each of the operating conditions of the ship obtained through the model line test or the numerical analysis. 8. The method of claim 7,
A line speed measuring unit for measuring a line speed of the ship; And
And a draft measuring unit for measuring the draft of the ship,
Wherein,
And receiving the measurement values from the yaw rate measurement unit and the draft measurement unit and grasping the navigation conditions of the ship.

Images