JP2011126510A - Wave-making resistance reducing device for ship - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a bow pad for producing great wave-making resistance reducing effects both during heavy-load operation and during light-load operation while producing promising great wave-making resistance reducing effects even during further increasing a speed. <P>SOLUTION: The blow pad 6 for a wave-making resistance reducing device is protruded frontward from a bow bulb to encircle a hull 1 and the bow bulb 3. It includes a bow pad having an upper edge in a relatively lower region than a full load draft line LWL, and a bow pad having an upper edge right under the full load draft line and shaped to ride on the bow pad, the bow pad having an angular shape formed into a curved shape to increase the capacity. Thus, great wave-making resistance reducing effects are produced in a high speed region. Additionally, the upper edge of the bow pad is protruded above the full load draft line and the front edge thereof is protruded to the front end to further increase the capacity. Thus, further great wave-making resistance reducing effects are produced in a higher speed region. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to an apparatus for reducing wave resistance in a ship.

FIG. 1 and FIG. 2 show a case where the wave resistance reducing device has a large effect of reducing the wave resistance during operation in a light load state among the wave resistance reducing devices invented in the past. FIG. 1 shows a side view of the bow, and FIG. 2 shows a sectional view taken along the line II-II in FIG. Further, FIGS. 3 and 4 show the case of a device having a large effect of reducing the wave resistance during operation in a heavy state. 3 shows a side view of the bow portion, and FIG. 4 shows a sectional view taken along the line IV-IV in FIG. A stem 2 is provided at the front end of the hull 1 above the full load water line LWL, and the upper end of the stem 2 is connected to the upper member TOP at the foremost end FE. In addition, the bow valve 3 protrudes forward from the bow perpendicular line FP below the full load water line LWL, and the bow valve 3 is connected to the hull 1 and the stem 2. The lower end of the bow valve 3 is connected to the ship bottom BL. Further, as shown in FIGS. 1 and 2, a bow pad 4 having an upper edge substantially below the full load water line UWL is provided so as to protrude forward from the bow valve 3 so as to surround the hull 1 and the bow valve 3. Further, as shown in FIGS. 3 and 4, a bow pad 5 having an upper edge directly below the full load water line LWL is provided so as to protrude forward from the bow valve 3 so as to surround the hull 1 and the bow valve 3. 1, 2, 3, 4, and hull 1, stem 2, bow valve 3, bow pad 4, and bow pad 5 are symmetrical with respect to the hull center line CL, so only the port side is displayed and the starboard side is displayed. Is omitted.
Japanese Patent Application No. 2004-260307

  Generally, when the hull 1 is sailing, a wave is generated from the bow and the hull resistance is increased, which is referred to as wave-making resistance. With respect to the ship-made wave resistance reducing apparatus invented in the past, first, the hull 1 equipped with the bow pad 4 having a large effect of reducing the wave resistance when operating in the light load state shown in FIGS. The wave generated from the bow by the action of the bow pad 4 is smaller than when the bow pad 4 is not equipped, and the wave-making resistance is reduced. At that time, the wave resistance reduction effect by the bow pad 4 is large during operation in a light load state where the bow draft is shallow, but is smaller during operation in a heavy load state where the bow draft is deep.

  On the other hand, when the hull 1 equipped with the bow pad 5 shown in FIG. 3 and FIG. 4 is running, the effect of reducing the wave resistance during the operation in the state where the bow draft is deep and heavy due to the action of the bow pad 5 is Larger, the draft at the bow is smaller when operated in a light load.

  As described above, both the bow pad 4 and the bow pad 5 of the conventional marine wave resistance reduction device are difficult to obtain a large wave resistance reduction effect when operating in both states when the draft of the bow is deep or shallow. . In other words, in Baupat 4 where a large wave drag reduction effect can be obtained when operating at a light load state where the draft at the bow is shallow, a large wave resistance reduction effect can be obtained when operating at a heavy load where the draft at the bow is deep. Absent. On the other hand, with Baupat 5, which has a large effect of reducing wave-making resistance when operating in a heavy load state where the draft of the bow is deep, a large effect of reducing wave-making resistance is obtained when operating at a light load with a shallow draft of the bow. It has the problem that it is not. Further, there is a problem that the wave resistance reduction effect becomes smaller as the ship speed becomes higher.

Means to solve the problem

  Therefore, in the present application, the bow-pad of the wave resistance reducing device that protrudes forward from the bow valve so as to surround the hull and the bow valve has an upper edge directly below the full load water line in a bow pad that has an upper edge relatively below the full load water line. A bow pad that is constructed by adding a bow pad is provided, and further, the angular shape of the bow pad is formed into a curved shape and the volume is increased, and the upper edge of the bow pad is further protruded above the full load water line, leading edge It is characterized by a bow pad constructed by projecting to the foremost end and further increasing the volume.

The invention's effect

  As described above in detail, according to the marine wave resistance reduction device of the present application, a light load state in which the draft of the bow portion becomes shallower even during operation in a heavy load state where the draft of the bow portion becomes deeper due to a relatively simple configuration. It is a very effective industrial device because it can greatly reduce the wave resistance even when operating in Japan, and can also reduce the wave resistance even if the ship speed is increased.

  DESCRIPTION OF EMBODIMENTS Hereinafter, a marine wave resistance reduction device for a ship according to an embodiment of the present invention will be described with reference to the drawings. First, FIG. 5 and FIG. 6 show the first embodiment. However, FIG. 5 shows a side view of the bow and FIG. 6 shows a sectional view taken along the line VI-VI in FIG. Note that FIG. 6 shows only the port side and omits the starboard side because it is symmetrical with respect to the hull center line CL. In the figure, the same reference numerals and symbols as those of the conventional ones represent the same constituent members as those of the conventional ones, so that the description thereof is omitted. The bow pad 6 is provided so as to protrude forward from the bow valve 3 so as to surround the hull 1 and the bow valve 3. At that time, as shown in FIG. 5 and FIG. 6, the bow pad 6 has the conventional bow pad 5 having the upper edge directly below the full load water line LWL on the conventional bau pad 4 having the upper edge relatively below the full load water line LWL. It is configured in this way. Accordingly, as shown in FIG. 5, the place where the overlaid bowpad overlaps with the overlaid bowpad is displayed as a knuckle line and point A, but has an angular shape. In addition, the side shape of the front edge is formed in a curved shape.

  For this reason, when the hull 1 is operating, the wave forming phenomenon generated from the bow portion is mitigated by the action of the bow pad 6, and the wave forming resistance is reduced. At that time, even when operating in a light load state where the bow draft is shallow, a high wave resistance reduction effect is exhibited even when operating in a heavy load state where the bow draft is deep.

  Next, FIG. 7 and FIG. 8 show a second embodiment. However, FIG. 7 shows a side view of the bow portion, and FIG. 8 shows a sectional view taken along the line VIII-VIII in FIG. In the figure, the same reference numerals and symbols as those of the conventional ones represent the same constituent members as those of the conventional ones, so that the description thereof is omitted. FIG. 8 shows only the port side because it is symmetrical with respect to the hull center line CL, and the starboard side is omitted. As shown in FIGS. 5 and 6, the bow pad 6 shown in the first embodiment is formed by forming a knuckle line and an angular shape indicated by point A into a curved shape, and further extending the front edge slightly forward. A bow pad 7 is provided so as to surround the hull 1 and the bow valve 3.

  For this reason, when the hull 1 equipped with the bow pad 7 is operating, the wave forming phenomenon from the bow is mitigated by the action of the bow pad 7 and the wave forming resistance is reduced than when the bow pad 7 is not equipped. . In that case, when the bow pad 7 of the first embodiment is equipped with the bow pad 7 when operated in a deep heavy state of the draft of the bow and in a light load state of shallow light of the draft of the bow. The effect of decreasing the wave resistance is larger.

  Next, FIG. 9 and FIG. 10 show a third embodiment. However, FIG. 9 shows a side view of the bow and FIG. 10 shows a cross-sectional view taken along the line XX in FIG. Note that FIG. 10 is symmetrical with respect to the hull center line CL, so only the port side is shown and the starboard side is omitted. The bow pad 8 is provided so as to surround the hull 1 and the bow valve 3. At that time, since the bow pad 8 is configured to have a larger volume than the bow pad 7 of the second embodiment, the cross-sectional area at the bow normal line FP is increased, and the forward projecting amount from the bow valve 3 is also configured to be longer. Yes.

  Therefore, when the hull 1 equipped with the bow pad 8 is in operation, the wave making phenomenon from the bow is mitigated by the action of the bow pad 8, and the wave making resistance is reduced than when the bow pad 8 is not equipped. The In that case, compared with the case where the bow pad 7 of the second embodiment is installed, the wave resistance reduction effect is exhibited even in a region where the boat speed is high both in the heavy load state and the light load state operation.

  Next, FIGS. 11, 12 and 13 show a fourth embodiment. However, FIG. 11 shows a side view of the bow, FIG. 12 shows an XII-XII sectional arrow view in FIG. 11, and FIG. 13 shows an XIII-XIII sectional arrow view in FIG. In the figure, the same reference numerals and symbols as those in the prior art indicate the same constituent members as those in the prior art, and the description thereof is omitted. 12 and 13 are symmetrical with respect to the hull center line CL, so only the port side is shown and the starboard side is omitted. The bow pad 9 is provided so as to protrude forward from the bow valve 3 so as to surround the hull 1 and the bow valve 3. At that time, the front edge of the bow pad 9 is projected to the position of the front end FE of the stem 2 as shown in FIG. That is, the front end of the bow pad has the same length as the distance Lf from the bow perpendicular FP to the front end FE of the stem 2, and the upper edge is directed upward from the point B at the intersection of the full load water line LWL and the bow perpendicular FP. It is configured so as to be connected downward to the front edge in a curved downward direction from a substantially middle position of the formed projecting length Lf from the bow perpendicular line FP. Further, as shown in FIGS. 12 and 13, the cross-sectional shape of the bow pad 9 is configured to have a substantially circular cross-sectional shape.

  When the hull 1 equipped with the bow pad 9 is in operation, the wave forming phenomenon from the bow portion is mitigated by the action of the bow pad 9, and the wave forming resistance is reduced compared to when the bow pad 9 is not equipped. In that case, compared with the case where the bow pad 8 of the third embodiment is equipped, the wave-making resistance reduction effect is shown even in a higher speed region.

  It is a side view of the bow part showing the conventional wave resistance reduction apparatus.   It is an II-II cross-sectional arrow view in FIG.   It is a side view of the bow part showing the conventional wave resistance reduction apparatus.   FIG. 4 is a sectional view taken along the line IV-IV in FIG. 3.   It is a side view of the bow part regarding 1st Example of this application.   It is a VI-VI cross-sectional arrow view in FIG.   It is a side view of the bow part regarding 2nd Example of this application.   It is a VIII-VIII cross-sectional arrow view in FIG.   It is a side view of the bow part regarding 3rd Example of this application.   FIG. 10 is a sectional view taken along line XX in FIG. 9.   It is a side view of the bow part regarding 4th Example of this application.   It is a XII-XII cross-sectional arrow view in FIG.   It is a XIII-XIII cross section arrow view in FIG.

DESCRIPTION OF SYMBOLS 1 Hull 2 Stem 3 Bow valve FP Bow perpendicular line BL Ship bottom LWL Full load water line CL Hull center line TOP Upper member FE The foremost end where the stem 2 and upper member TOP cross 4 Bowput 5 Bowup 6 Bowup 8 Bowup 9 Bowup Lf Bow bow F Length between front end FE

Claims (3)

  In a bow pad of a ship wave drag reducing device for a ship, which projects forward from the bow valve so as to surround the hull and the bow valve, the bow pad having an upper edge relatively below the full load water line has an upper edge directly below the full water line. A marine wave resistance reduction device for a ship, characterized in that a bow pad formed by adding a bow pad is provided.   In claim 1, the shape of the two bow pads overlapping each other to form a knuckle line is formed in a curved shape, the length of the forward protrusion from the bow valve is increased, and the area of the cross section is expanded to increase the volume. A marine wave resistance reduction device for a ship, characterized in that a bow pad is provided.   3. The volume according to claim 2, wherein the upper edge of the front protrudes from the intersection of the bow perpendicular line and the full load water line in the bow pad sequentially above the full load water line, the front edge protrudes to the foremost position of the hull, and the cross-sectional area is expanded. A wave-making resistance reducing device for a ship, characterized in that a bow-pad with a large configuration is provided.

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