JP5103689B2 - Hull structure with step of increasing resistance in waves - Google Patents

Description

  The present invention relates to a hull structure provided with a wave resistance increase / reduction step that reduces an increase in wave resistance without increasing resistance in plain water.

Conventionally, it has been proposed to attach a structure to a hull for the purpose of reducing resistance in waves, reducing shaking caused by waves, or mitigating wave impacts.
For example, Patent Document 1 discloses providing a groove that is inclined downward from the bow portion toward the rear for the purpose of mitigating intense wave impact. By providing a plurality of the grooves in parallel to the outer surface of the bow portion above the water line, the concave portion of the bow outer plate due to a strong wave impact is prevented.
Patent Document 2 discloses that a horizontal wave-breaking fender is provided for the purpose of reducing an increase in hull resistance due to breaking of waves hitting the bow. The short-wave random waves are eliminated by the wave breakers at appropriate stages according to the wave height, and flow to the two ship sides along the lower surfaces of the wave breakers so as not to generate breaking waves that cause energy loss.

  Further, Patent Document 3 discloses that a protrusion is provided on an outer plate portion having a flare angle of 30 degrees or more for the purpose of reducing wave impact at the bow portion. Patent Document 3 relates to a ship that takes a large deck area by forming a skin part with a flare angle of 30 degrees or more as a precondition, and the skin rate with a flare angle of 30 degrees or more has a damage rate. In order to drastically increase, a protrusion is provided to alleviate the impact caused by waves on the outer plate.

Patent Documents 4 and 5 disclose that a horizontal spray prevention fin is provided at the bow for the purpose of preventing the generation of spray waves. Spray waves increase the resistance of the hull to the hull when it breaks, and it can also cause the generation of breaking noise and poor visibility. To prevent. Accordingly, in order to prevent the generation of the spray wave itself, the spray preventing fin is provided at the draft surface and is provided from the bow tip to both sides of the hull.
Further, Patent Document 6 discloses that a band-shaped protrusion that is inclined so as to decrease from the bow end to the rear while moving along the left and right sides of the ship for the purpose of reducing the pitching of the ship due to waves is disclosed. These band-shaped projections are provided on the hull outer plate surface above the full load water line so as to increase the wave-making damping force by interacting with seawater, such as pitching and heaving of the hull when navigating in the waves. It suppresses hull movement.

  Moreover, in patent document 7, forming the fine unevenness | corrugation in the surface is disclosed in order to provide the flow resistance reduced steel plate excellent in workability. Even if a base material with an uneven surface is used, this flow resistance reduced steel sheet is filled with unevenness in the process of applying a coating film. In order to solve problems such as large and complicated shapes, the purpose is to improve workability and to suppress manufacturing and maintenance costs.

A microfilm (issued by the Japan Patent Office, March 18, 1975) in which the description and drawings attached to the application of the actual application No. 48-76880 (No. 50-23880) are taken. A microfilm (issued by the Japan Patent Office on August 15, 1984) that captured the specifications and drawings attached to the application of the actual application No. 58-15796 (No. 59-121293). A microfilm (issued by the Japan Patent Office on December 16, 1985) that captured the contents of the specification and drawings attached to the application of the actual application No. 59-78054 (No. 60-189486). JP-A-6-122390 JP-A-6-321172 JP 2004-136780 A JP 2004-137777 A

In a ship having a flare at the bow, the resistance in waves increases due to the influence of waves on the flare, but it has not been noticed to reduce the increase in resistance in waves due to flare. In Patent Document 3, the flare portion itself is provided with a protrusion for wave impact mitigation.
Further, since the static water level rises at the bow when the ship is navigating, the structure located below the static water level raising position during the navigation is subjected to fluid resistance and increases resistance in plain water.
However, none of the structures disclosed in Patent Documents 1 to 7 reduce an increase in resistance in waves caused by flare, nor is it a focus on the static water level rising position.

  SUMMARY OF THE INVENTION An object of the present invention is to provide a hull structure including a wave resistance increase reduction step for reducing an increase in wave resistance without increasing resistance in plain water.

The hull structure having the wave resistance increase / decrease step according to the first aspect of the present invention includes a flare provided at a bow portion of the hull, and a flare angle of the flare at the bow portion increases toward the rear of the hull. and a wave in resistance increase reduction step repel wave provided on portions, the waves in the resistance increase reduction step, a above the static water level raised position in the bow portion below said flare, ship舶毎Only the position higher than the maximum height position of the static water level rising position, which is the rising position of the water surface that occurs when traveling in flat water where there is no wave due to the nautical speed set at the time of design as a representative speed The hull has a flare and a non-flare part, and the wave resistance increase and reduction step is provided below the flare height in a side view. And wherein the Rukoto.
Since the wave going toward the flare is bounced back by the wave resistance increase reduction step, the wave collision with the flare can be reduced, and the increase in the wave resistance can be reduced. Moreover, the resistance in plain water does not increase by providing the wave resistance increase reduction step above the static water level rising position. The provision of the wave resistance increase / reduction step “below the flare” means that the portion of the wave resistance increase / reduction step that functions to rebound the wave faces the flare. For this reason, for example, a joint portion with a support structure or the like may be provided in addition to the portion that performs the function of rebounding the wave in the wave resistance increase / decrease step in the flare.
According to a second aspect of the present invention, there is provided a hull structure comprising the wave resistance increase / reduction step according to claim 1, wherein a planar shape of the bow portion and the wave resistance increase / reduction step is a width of the bow portion. In addition, the width of the wave resistance increase / decrease step in addition to is narrowed toward the bow side, and the outer side far from the center of the hull is linear.
According to this configuration, the increase in wave resistance can be reduced, and the length of the outer side can be shortened compared to the case where the outer side of the wave resistance increase reduction step is formed along the outer shape of the hull. It is possible to suppress an increase in resistance due to contact between the outer side (outer surface) and the wave. The “planar shape” of the wave resistance increase / reduction step is obtained by projecting the wave resistance increase / reduction step onto the horizontal plane in the state of use, that is, the shape when the wave resistance increase / reduction step is viewed from the bottom of the hull. Refers to the shape of In addition, the “outside side” being “straight shape” means a shape formed such that the length of the outside side is shorter than that formed along the outer surface shape of the hull skin. This includes not only a shape in which the side end and the stern side end are connected by a straight line, but also a shape in which both are connected by a substantially straight line.
According to a third aspect of the present invention, there is provided a hull structure comprising the wave resistance increase / reduction step according to claim 1 or 2, wherein a step angle of the wave resistance increase / reduction step as viewed from the side is determined by the hull structure. It is characterized by being maintained substantially constant toward the rear.
According to this configuration, the angle at which the wave collides with the wave resistance increase / reduction step can be made substantially the same throughout the wave resistance increase / reduction step. Here, the “step angle as viewed from the side of the wave resistance increase reduction step” means that when the wave resistance increase reduction step is viewed from the side of the ship, the outer side of the wave resistance increase reduction step and the horizontal plane The angle formed by Further, “the step angle viewed from the side is substantially constant toward the rear of the hull” means that the step angle viewed from the side is within ± 5 degrees.
According to a fourth aspect of the present invention, in the hull structure having the wave resistance increase / reduction step according to one of claims 1 to 3, the angle of the lower surface of the wave resistance increase / reduction step is set. It is characterized by further comprising a support structure that is set above the horizontal plane and that supports the wave resistance increase / decrease step by the flare.
According to this configuration, it is possible to mitigate an impact caused by a wave collision on the lower surface of the wave resistance increase / reduction step, and the support structure can support the wave resistance increase / reduction step. It is possible to suppress damage in the resistance increase reduction step.
According to a fifth aspect of the present invention, in the hull structure having the wave resistance increase / reduction step according to claim 4, the lower surface of the support structure is in contact with the upper surface of the wave resistance increase / reduction step. And the angle of the outer surface is set to be substantially vertical or an angle from the vertical to the outer surface downward.
According to this configuration, even when a wave reaches the upper surface of the wave resistance increase / reduction step, water can be quickly dropped on the outer surface of the support structure.
The present invention described in claim 6 is characterized in that the outer surface of the support structure is formed in a peeled shape for peeling waves in the ship structure having the step of increasing and decreasing resistance in waves according to claim 5. To do.
According to this configuration, waves can be peeled off from the outer surface of the support structure. Here, “to remove the waves” means to suppress the adhesion of the waves or to eliminate them by crushing so that the influence of the waves can be canceled.

The hull structure having the wave resistance increase / reduction step of the present invention according to claim 7 includes a flare provided at the bow portion of the hull, and a wave resistance increase decrease step for returning waves provided at the side surface portion of the hull. wherein the a wave in resistance increase reduction step, a above the static water level raised position below the height of the flare, the waves by cruise speed set at the time of design as a typical speed of the watercraft舶毎It is provided only at a position higher than the maximum height position of the static water level rising position, which is a rising position of the water surface generated when traveling in plain water where there is no air, and the hull has a portion that is not flare and flare The wave resistance increase / decrease step is provided below the flare height in a side view.
Here, “the height of the flare” refers to the height of the lowest part of the flare from the horizontal plane. And, “providing the wave resistance increase reduction step below the flare height” means that the portion of the wave resistance increase reduction step that functions to rebound the wave when the hull is viewed from the side is the most flare of the flare. It is provided below the height of the lower part.
Since the wave going toward the flare is bounced back by the wave resistance increase reduction step, the wave collision with the flare can be reduced, and the increase in the wave resistance can be reduced. Moreover, the resistance in plain water does not increase by providing the wave resistance increase reduction step above the static water level rising position. Further, by setting the angle of the lower surface of the resistance increase reduction step in the waves downward from the horizontal plane, it is possible to effectively alleviate the increase in resistance due to waves from the oblique direction or the lateral direction.
The present invention described in claim 8 is a hull structure comprising the wave resistance increase / reduction step according to any one of claims 1 to 7, wherein the wave resistance increase / reduction step is arranged at the rear of the hull. It is characterized by its height.
With this configuration, a drag force is generated in the traveling direction by the wave force acting on the lower surface of the wave resistance increase / reduction step, and this drag force can be used for thrust.
The present invention according to claim 9 is a hull structure comprising the wave resistance increase / reduction step according to claim 6 or claim 8, wherein the outer surface of the wave resistance increase / reduction step peels off the wave. It is characterized by being formed.
According to this configuration, waves can be peeled off from the outer surface of the wave resistance increase / decrease step.
According to a tenth aspect of the present invention, in the hull structure having the wave resistance increase / decrease step according to the sixth or ninth aspect , the peeling shape is a hollow shape and / or a protruding shape. And
According to this configuration, the depression shape and / or the protruding shape can effectively peel waves from the outer surface of the support structure and / or the wave resistance increase / reduction step.

According to the hull structure with the wave resistance increase / reduction step of the present invention, since the wave resistance increase / reduction step is provided at the bow portion below the flare, the wave traveling toward the flare is increased in the wave resistance increase / reduction step. Since it is rebounded and peeled off from the hull surface, the influence of the wave on the flare can be reduced, and the increase in resistance in the waves can be reduced. Moreover, the resistance in plain water does not increase by providing the wave resistance increase reduction step above the static water level rising position.
In addition, the plan shape of the bow and the increase in resistance reduction step in the wave is added to the width of the bow, the width of the increase in resistance reduction step in the wave is narrower toward the bow side, and the outer side far from the center of the hull. If it is set as the structure which is linear shape, the resistance increase by a contact with an outer side (outer surface) and a wave can be suppressed.
Further, if the step angle viewed from the side of the wave resistance increase reduction step is maintained substantially constant toward the rear of the hull, the load applied to the wave resistance increase reduction step is uniform when the wave bounces back. It can be.
In addition, if the angle of the lower surface of the wave resistance increase reduction step is set above the horizontal plane and the structure further includes a support structure, the impact caused by the collision of waves on the lower surface of the wave resistance increase reduction step is mitigated. In addition, by supporting the support structure, it is possible to disperse the load concentration on the wave resistance increase reduction step and suppress damage.
Further, the support structure may be configured such that the lower surface thereof is in contact with the upper surface of the wave resistance increase and reduction step, and the angle of the outer surface is set to be substantially vertical or an angle from the vertical to the outer surface downward. For example, even when the hull receives waves from oblique or lateral directions and reaches the top surface of the wave resistance increase / decrease step, water can be quickly dropped through the outer surface of the support structure. . Moreover, the influence of the wave from the diagonal direction or a horizontal direction can be suppressed rapidly.
Further, if the outer surface of the support structure is formed in a peeled shape that peels off waves, it is possible to suppress the adhesion of waves on the outer surface, or to crush and eliminate the influence of waves on the hull. .
In addition, it is equipped with a flare provided at the bow of the hull and a wave resistance increase reduction step for returning waves provided at the side of the hull. The wave resistance increase reduction step is performed at a static water level below the flare height. If it is provided above the position and the angle of the lower surface of the resistance increase reduction step in the wave is set below the horizontal plane, the wave can be returned by the resistance increase reduction step in the wave on the side surface of the hull. In particular, an increase in resistance due to waves from an oblique direction or a lateral direction can be effectively mitigated.
Further, if the wave resistance increase / reduction step is increased toward the rear of the hull, a drag force is generated in the traveling direction by the wave force acting on the lower surface of the wave resistance increase / reduction step, and this drag force is thrust. Can be used.

The principal part conceptual side view which shows the hull structure provided with the resistance increase reduction step in the wave by the 1st Embodiment of this invention The principal part conceptual front view explaining the flare and flare angle of the hull structure provided with the resistance increase reduction step in the wave by the 1st Embodiment of this invention The principal part conceptual bottom view which looked at the bow part vicinity of the hull from the ship bottom side for demonstrating the plane shape of the resistance increase reduction process in waves by the 1st Embodiment of this invention 1 is a cross-sectional view taken along arrow EE in FIG. The graph which shows the influence of the speed with respect to the resistance increase reduction factor in a wave by the ship structure provided with the resistance increase reduction step in a wave by the 1st Embodiment of this invention The graph which shows the influence of the direction of a wave with respect to the resistance increase reduction factor in a wave by the ship structure provided with the resistance increase reduction step in a wave by the 1st Embodiment of this invention FIG. 4 is a conceptual side view of a main part of a hull structure schematically showing the influence of a transverse wave, and (a) a conceptual side view of the main part showing the influence of a wave on a hull structure not provided with a wave resistance increase and reduction step; b) Main part conceptual side view showing reduction of the influence of waves by peeling waves on the hull surface by the wave resistance increase reduction step according to the first embodiment. The principal part conceptual side view which shows the hull structure provided with the resistance increase reduction step and the support structure in the wave by the 2nd Embodiment of this invention 8 is a cross-sectional view taken along arrow FF in FIG. Sectional drawing principal part which shows the other structure of the resistance increase step in waves by the 2nd Embodiment of this invention, and a support structure The principal part conceptual front view which shows an example of the peeling shape which peels the wave of the outer surface of the support structure by the 2nd Embodiment of this invention It is an example of the cross section of the peeling shape of the outer surface 61 of FIG. 11, (a) is sectional drawing of what formed the hollow shape, (b) is sectional drawing of what formed the protrusion shape. Surface view of peeled shape of outer surface 61 different from FIG. The principal part conceptual side view which shows the hull structure provided with the resistance increase reduction step in the wave by the 3rd Embodiment of this invention Main part concept GG arrow sectional drawing of FIG. 14 is a conceptual cross-sectional view showing a main part of a hull structure having a wave resistance increase / reduction step at a position rearward (near the hull center) than FIG.

(First embodiment)
The hull structure provided with the wave resistance increase / decrease step according to the first embodiment of the present invention will be described below.
FIG. 1 is a conceptual side view of a main part showing a hull structure provided with a wave resistance increase / reduction step according to the present embodiment.
The hull structure having the wave resistance increase / decrease step according to the present embodiment includes a flare 21 provided at the bow 11 of the ship (hull) 10 and a bow 11 where the flare angle of the flare 21 increases toward the rear of the hull. And a wave resistance increase reduction step 30 that rebounds the provided wave. The wave resistance increase reduction step 30 is provided below the flare 21 and above the static water level rising position A in the bow 11 to reduce the resistance increase due to the flare 21 in the wave.

FIG. 2 is a main part conceptual front view for explaining the flare and flare angle of the hull structure of the present embodiment. As shown in FIG. 1, the wave resistance increase / reduction step 30 is provided at the bow portion 11 where the flare angle increases toward the rear of the hull. Further, the wave resistance increase / reduction step 30 is provided in the bow portion 11 from the front of the front perpendicular (FP, Fore Perpendicular). For this reason, as shown in FIG. 2, at the portion where the upper surface 32 of the wave resistance increase / reduction step 30 is in contact with the bow 11, it is formed by the tangent of the outer surface of the hull and the vertical line V when viewed from the front of the hull. The flare angle θ increases toward the rear of the hull. More specifically, the upper surface 32 is formed at a position where the flare angle θ _{2 at} the rear end is larger than the flare angle θ _{1 at the} front end of the wave resistance increase reduction step 30. The wave resistance increase / reduction step 30 may be formed in a shape extending from the bow portion 11 to the ship side portion.

Those in the hull structure of this embodiment, the bow portion 11, since the waves in the resistance increase reduction step 30 before the front vertical line is provided, the flare angle theta ₁ of the front end is smaller than the normal 30 degrees It becomes.
In the present embodiment, the flare 21 is a portion where the upper flare angle θ of the outer surface of the hull is larger than 0 degree and larger than the lower flare angle θ. Since the flare 21 is above the wave resistance increase reduction step 30, the flare angle θ ₃ above it is larger than the flare angle θ _{1 at the} front end of the wave resistance increase reduction step 30, as shown in FIG. than medium-resistance increases reducing step 30 rear flare angle theta ₂ of the better flare angle theta ₄ thereabove is large.
Although FIG. 2 shows a configuration in which the flare 21 is provided in the bow portion 11, the flare 21 does not have to be provided in all from the bow portion 11 to the stern portion. For example, a flare 21 is provided in the vicinity of the bow 11, and the hull shape in which the flare 21 is upright thereafter, that is, a part of the outer surface of the hull in which the wave resistance increase reduction step 30 is provided is configured to be upright. Also good.

The static water level rising position is a rising position of the water surface that occurs when the ship 10 travels in plain water (there is no wave). Further, the ship 10 is set with a nautical speed as a typical ship speed at the time of design, and the static water level rising position is caused by the speed at the nautical speed set for each ship 10.
As shown in FIGS. 1 and 2, the static water level rising position A is in a state where it rises higher than the waterline C, particularly at the bow portion 11, and descends smoothly and approaches the waterline C.
In these figures, only one side surface of the ship 10 is shown, but the other side surface of the ship 10 has the same configuration.

FIG. 3 is a conceptual bottom view of the main part when the vicinity of the bow part 11 of the ship 10 is viewed from the ship bottom side. As shown in the figure, the planar shape when the wave resistance increase / decrease step 30 is viewed from the ship bottom side is formed such that the outer side 30L far from the center line H of the hull has a linear shape. And the width | variety X between the outer side 30L provided in the both sides | surfaces of the ship 10 is narrow toward the bow side of the right side of the figure. By configuring the planar shape of the wave resistance increase / reduction step 30 in this way, the reflected wave resistance of the wave resistance increase / reduction step 30 can be reduced.
When the wave resistance increase / decrease step 30 is viewed from the side of the ship 10 (see FIG. 1), the angle formed by the outer side 30L and the horizontal plane B is maintained at approximately 0 degrees, and the outer side 30L. The wave resistance increase / reduction step 30 is formed so that is substantially horizontal.
Further, the wave resistance increase reduction step 30 has a pointed shape when the tip thereof is viewed in plan or as viewed from the side as shown in FIG. The structure is relaxed.

  4 is a cross-sectional view taken along arrow EE in FIG. As shown in the figure, the lower surface 31 of the wave resistance increase / decrease step 30 is set so that the angle α is higher than the horizontal plane B. The wave resistance increase / reduction step 30 is formed so that the angle α of the lower surface 31 with respect to the horizontal plane is maintained substantially constant toward the rear of the hull. Here, the angle α being substantially constant means that the change in the angle of the outer side 30L and / or the lower surface 31 of the wave resistance increase / reduction step 30 is within ± 5 degrees.

FIG. 5 is a graph showing the influence of the speed on the increase / decrease rate in wave resistance by the hull structure including the increase / decrease step in wave resistance according to this embodiment.
The experiment was carried out in the applicant's water tank (length 150 m).
The model ship was assumed to have a captain of 3.5m, and a master ship of about 190m. The wave state was assumed to be a direction wave assuming an actual ship equivalent wave height of 3 m and a wavelength ship length ratio of 0.3 obtained by dividing the wavelength by the ship length.
The test speed was 0.86 m / sec (12 knots) in Example 1 and Comparative Example 1, whereas 1.1 m / sec (15.5 knots) in Example 2 and Comparative Example 2 In Example 3 and Comparative Example 3, the speed was 1.3 m / sec (19 knots). In FIG. 5, Comparative Examples 1 to 3 are not provided with the wave resistance increase / reduction step 30, and Examples 1 to 3 are provided with the wave resistance increase / reduction step 30.
The Froude number Fn represented by the following formula (1) is 0.151 in Example 1 and Comparative Example 1, 0.195 in Example 2 and Comparative Example 2, and 0 in Example 3 and Comparative Example 3. .239.
Fn = V / (L × g) ^1/2 (1)
(V: speed, L: captain, g: gravitational acceleration)
Further, in waves resistance increase reduction step 30, the width W ₁ as an actual ship scale 5 m, the height is assumed to be of 1.5 m, and the angle α of the lower surface 31 of wave in the resistance increase reduction step 30 32 ° A reduced scale model was used. The wave height H _W in terms of actual ship was set to 3.0 m.

The vertical axis in FIG. 5 is the resistance increase coefficient (K _AW ) made dimensionless by using the wave height, and by providing a wave resistance increase reduction step by comparison between Examples 1 to 3 and Comparative Examples 1 to 3, Under the conditions of a wave height of 3 m and a heading wave, Examples 1 to 3 having a planned speed of 12 knots, 15.5 knots, and 19 knots have a wave resistance of 1.0%, 14.4%, and 18. It was revealed that it is expected to decrease by 6%.

FIG. 6 is a graph showing the influence of the wave direction on the increase / decrease rate of resistance in waves by the hull structure including the increase / decrease step of resistance in waves according to the present embodiment. In the same figure, in addition to the results of Example 2 and Comparative Example 2 shown in FIG. 5, Example 4 and Comparative Example in which the direction wave of Example 2 and Comparative Example 2 was changed to a wave having an angle of 20 degrees with respect to the traveling direction. The result of Example 4 and the result of Example 5 and Comparative Example 5 in which the direction wave of Example 2 and Comparative Example 2 is changed to a wave having an angle of 80 degrees with respect to the traveling direction are shown. Here, the angle with respect to the traveling direction refers to that specified by the angle formed by the traveling direction of the ship 10 (the direction in which the bow faces) and the traveling direction of the waves in a state where the ship 10 is stationary.
According to the comparison between Examples 2, 4, and 5 and Comparative Examples 2, 4, and 5, under the condition of a wave height of 3 m and a planned speed of 15.5 knots, a wave resistance increase (reduction) In Example 2), the resistance in the wave is reduced by 14.4%, in the wave with the angle of 20 degrees (Example 4), the resistance in the wave is reduced by 10.6%, and in the wave with the angle of 80 degrees (Example 5), it is in the wave. It became clear that the resistance is expected to decrease by 8.5%. That is, it has been found that the wave resistance increase reduction step has an effect of reducing the wave resistance even with respect to a wave from an oblique direction or a wave from a substantially horizontal direction.

  FIG. 7 is a conceptual side view of the main part of the hull structure schematically showing the influence of waves in the horizontal direction. As shown in FIG. 5A, in the hull structure that does not include the wave resistance increase / decrease step 30, the wave reaches a position substantially above the flare 21 of the bow portion 11. This increases the resistance in waves under the influence of waves. On the other hand, as shown in FIG. 5B, the hull structure including the wave resistance increase / reduction step 30 below the flare 21 as in the hull structure of the present embodiment has the wave resistance increase / reduction step. 30 can remove the wave on the hull surface. Therefore, the wave can be prevented from reaching the flare 21 at the upper part of the wave resistance increase reduction step 30 of the bow portion 11. As a result, not only the direction wave but also the influence of the wave from the oblique direction (oblique wave) and the wave from the transverse direction (transverse wave) can be suppressed and the resistance increase reduction rate in the waves can be reduced.

  According to the hull structure provided with the wave resistance increase / reduction step according to the first embodiment, the wave traveling toward the flare 21 is rebounded by the wave resistance increase / reduction step 30, so that the wave is separated from the surface of the hull. Thereby, the collision of the wave with the flare 21 can be decreased and the increase in resistance in waves can be reduced. Further, by providing the wave resistance increase reduction step 30 above the static water level rising position A, the resistance in plain water does not increase.

  In addition, since the angle of the lower surface 31 of the wave resistance increase / reduction step 30 is set to be higher than the horizontal plane, it is possible to mitigate the impact caused by the wave collision on the lower surface 31 of the wave resistance increase / reduction step 30; It is possible to suppress damage in the wave resistance increase reduction step 30. In order to suppress damage in the wave resistance increase / reduction step 30, it is preferable that the angle formed by the lower surface 31 and the horizontal plane is 30 ° or more.

(Second Embodiment)
The hull structure provided with the wave resistance increase / decrease step according to the second embodiment of the present invention will be described below. The hull structure of the present embodiment is different from the hull structure of the first embodiment described above in that it further includes a support structure that supports the wave resistance increase / decrease step in the wave. In addition, the same code | symbol is attached | subjected to the member same as the member demonstrated in 1st Embodiment, and description is abbreviate | omitted in this embodiment.
FIG. 8 is a conceptual side view of a main part showing a hull structure including a wave resistance increase / reduction step and a support structure according to the present embodiment. 9 is a cross-sectional view taken along arrow FF in FIG. In these figures, only one side surface of the ship 10 is shown, but the other side surface of the ship 10 has the same configuration.
As shown in these drawings, the marine vessel 10 of the present embodiment includes a support structure 60 that supports the wave resistance increase / decrease step 30 in the bow portion 11. The support structure 60 supports the wave resistance increase / reduction step 30 on the flare 21 of the wave resistance increase / reduction step. For this reason, the load at the time of rebounding a wave can be disperse | distributed and it can suppress that the resistance increase reduction step 30 in a wave is damaged.
By providing the support structure 60, it is possible to improve the strength of the wave resistance increase reduction step 30 and reduce the resistance increase in the waves. In particular, even if the waves from the transverse direction are peeled off from the hull surface, that is, even if the oblique waves or the transverse waves exceed the resistance increase reduction step 30, the support structure 60 can improve the return of the waves. Can be reduced.

Further, the lower surface 62 of the support structure 60 is in contact with the upper surface 32 of the wave resistance increase / decrease step 30 and the outer surface 61 thereof is set in a substantially vertical direction, that is, its angle is set to be substantially vertical. ing. When the support structure 60 is viewed from the front, as shown in FIG. 9, the outer surface 61 of the support structure 60 is configured to connect the outer side 30 </ b> L of the wave resistance increase reduction step 30 and the flare 21. ing. By configuring the outer surface 61 in this way, the wave W that has exceeded the wave resistance increase / decrease step 30 can be effectively rebounded by the outer surface 61.
In addition, as shown with the dashed-two dotted line in the same figure, even if the support structure 60 has a structure where the outer surface 61 is directed downward from the vertical, that is, the upper part protrudes outward from the lower part of the outer surface 61. Good.

  FIG. 10 is a cross-sectional view of a principal part showing another configuration of the wave resistance increase / decrease step and the support structure according to the present embodiment. 10 shows a portion corresponding to the portion indicated by FF in FIG. As shown in the figure, the outer surface 61 of the support structure 60 that supports the wave resistance increase / decrease step 30 has an outer surface 61V that is a portion substantially parallel to the vertical direction, and the lower part protrudes outward from the upper part. An outer surface 61S can also be used. In this way, it is constituted by two planes having different angles with respect to the vertical direction. For this reason, it is possible to remove the wave from the flare 21 by the outer surface 61V and suppress the influence on the flare 21. In addition, only the outer surface 61V increases the distance for connecting the outer side 30L and the flare 21, so that even when it is difficult to connect by the support structure 60, both can be connected.

FIG. 11 is a main part conceptual front view showing an example of a peeling shape for peeling the waves on the outer surface 61 of the support structure 60. As shown in the figure, if the outer surface 61 of the support structure 60 is formed as a plurality of depressions or protrusions extending in a substantially horizontal direction, the waves are broken on the outer surface 61 and separated from the hull surface. be able to. FIG. 12 is an example of a cross-section of the peeled shape of the outer surface 61 of FIG. 11, (a) shows a cross-sectional view of the depression shape formed, and (b) shows a cross-sectional view of the protrusion shape formed. Show.
FIG. 13 is a surface view of the peeled shape of the outer surface 61 different from FIG. As shown in the figure, the outer surface 61 can be configured as a plurality of depressions or protrusions. In addition, the shape of the outer surface 61 can also be configured by combining those shown in FIGS.

(Third embodiment)
The hull structure provided with the wave resistance increase / decrease step according to the third embodiment of the present invention will be described below.
FIG. 14 is a main part conceptual side view showing a hull structure provided with a wave resistance increase / reduction step according to the present embodiment, and FIG. 15 is a main part conceptual GG sectional view of FIG. FIG. 16 is a conceptual cross-sectional view of a main part showing a hull structure provided with a wave resistance increase / reduction step on the rear side (closer to the center of the hull) than FIG. In addition, the same code | symbol is attached | subjected to the member same as the member demonstrated in 1st or 2nd embodiment, and description is abbreviate | omitted. Moreover, although only the one side surface of the ship 10 is shown in the figure, the other side surface of the ship 10 has the same configuration.

The hull structure including the wave resistance increase / reduction step according to the present embodiment includes a wave resistance increase / reduction step 70 that bounces waves back to the hull side of the ship 10. The wave resistance increase reduction step 70 is provided below the height of the flare 21 and above the static water level rising position A, and reduces the increase in resistance at the side of the hull in the wave.
In this embodiment, as shown in FIG. 15, a wave resistance increase / reduction step 70 is provided below the flare 21 and above the static water level rising position A (see FIG. 14). Thereby, the resistance increase of the hull side part in a wave can be reduced. FIG. 15 shows the configuration in which the flare 21 is formed above the wave resistance increase / decrease step 70. However, as shown in FIG. 16, the flare 21 is formed in the bow portion 11, and the ship side It is good also as a structure by which the flare 21 is not formed in the center part.
The lower surface 71 of the wave resistance increase / reduction step 70 has an angle β set downward from the horizontal plane B. That is, the lower surface 71 is positioned below the horizontal plane B including the vicinity of the portion where the wave resistance increase reduction step 70 is attached to the ship 10 in the plane. In this case, when the wave is pushed back, the force applied to the wave resistance increase / reduction step 70 is increased, but the support structure 60 can make the strength of the wave resistance increase / reduction step 70 sufficient.
Further, the angle γ formed between the lower surface 71 and the side surface 72 of the wave resistance increase / reduction step 70 can be made an obtuse angle. As a result, it is possible to prevent the waves from coming off and the rebound of the transverse waves to the flare 21.
Further, the wave resistance increase / reduction step 70 on the side of the hull is made higher toward the rear of the ship 10. In addition, when providing the wave resistance increase reduction step 70 in the hull side part of the ship 10, it is preferable to provide it behind the maximum height position of the water level raising position A.
The wave resistance increase / reduction step 70 may be provided not on the hull side portion of the ship 10 but on the bow portion 11.
In the present invention, a flare 21 is formed at the bow 11 as shown by a two-dot chain line in FIG. 16, and the flare 21 is not formed at the center on the ship side. (Flare line, indicated as “F.L.” in FIG. 16) The following is implemented as a configuration in which a wave resistance increase reduction step 70 is provided above the static water level rising position A (see FIG. 14). You can also

According to the hull structure provided with the wave resistance increase reduction step according to the third embodiment, the wave resistance increase can be reduced by suppressing the wave height at the wave resistance increase reduction step 70. Further, by providing the wave resistance increase reduction step 70 above the static water level rising position A, the resistance in plain water does not increase.
Further, since the wave resistance increase reduction step 70 is provided behind the maximum height position of the static water level rising position A, the wave resistance increase reduction step 70 is less likely to be submerged in the water. The resistance in the waves can be reduced by increasing the resistance and rebounding the wave.

In addition, since the angle of the lower surface 71 of the wave resistance increase reduction step 70 is set to be lower than the horizontal plane, the wave rebound effect can be increased and the effect of reducing the wave resistance increase can be enhanced.
Further, since the wave resistance increase / reduction step 70 is made higher toward the rear of the ship 10, the drag force acts in the traveling direction by the force of the waves acting on the lower surface 71 of the wave resistance increase / reduction step 70 as shown in FIG. This drag can be used for thrust as shown by a thick arrow.

  The present invention can be widely applied to ships such as container ships, oil tankers, LNG ships, and LPG ships. Moreover, it is possible to provide the wave resistance increase / decrease step at the time of construction of the ship, or to add it to the existing ship later.

10 Ship (Hull)
DESCRIPTION OF SYMBOLS 11 Bow 21 Flare 30 Wave resistance increase reduction step 30L Outer side 31 Lower surface 32 Upper surface 60 Support structure 61 Outer surface 62 Lower surface 70 Wave resistance increase decrease step 71 Lower surface A Static water level rise position B Horizontal surface C Dredging line H Center line

Claims (10)

A flare provided at the bow portion of the hull, and a resistance increase reduction step during the wave in which the flare angle of the flare of the bow portion increases at a portion where the flare increases toward the rear of the hull, and the resistance increase during the wave is provided. the reduction step, a above the static water level raised position in the bow portion below said flare is the absence of waves by cruise speed set at the time of design as a typical speed of the watercraft舶毎Rights It is provided only at a position higher than the maximum height position of the static water level rising position, which is the rising position of the water surface generated when traveling underwater,
The hull has flares and non-flares,
A hull structure provided with a wave resistance increase / reduction step, wherein the wave resistance increase / reduction step is provided below the flare height in a side view.   The plane shape of the bow portion and the wave resistance increase / reduction step is such that the width of the wave resistance increase / reduction step in addition to the width of the bow portion is narrowed toward the bow side, and from the center of the hull. The hull structure having a wave resistance increase / decrease step according to claim 1, wherein the far outer side is linear.   3. The wave resistance increase / reduction step according to claim 1, wherein a step angle in a side view of the wave resistance increase decrease step is maintained substantially constant toward the rear of the hull. Hull structure.   2. The structure according to claim 1, further comprising a support structure that sets an angle of a lower surface of the wave resistance increase / reduction step above the horizontal plane and supports the wave resistance increase / reduction step on the flare. A hull structure comprising the wave resistance increase / decrease step according to claim 3.   The lower surface of the support structure is in contact with the upper surface of the wave resistance increase / reduction step, and the angle of the outer surface is set to be substantially vertical or the angle from which the outer surface is directed downward. The hull structure provided with the wave resistance increase / decrease step according to claim 4.   6. The hull structure having a wave resistance increase / reduction step according to claim 5, wherein an outer surface of the support structure is formed in a peeling shape for peeling waves. A flare provided at the bow of the hull and a wave resistance increase / reduction step for returning waves provided on the side of the hull, wherein the wave resistance increase / reduction step is performed at a static water level below the flare height. a top is than raised position, the static water level which is the water surface of the raised position occurs when running flat water is the absence of waves by cruise speed set at the time of design as a typical speed of the watercraft舶毎It is provided only at a position higher than the maximum height position of the ascending position,
The hull has flares and non-flares,
A hull structure provided with a wave resistance increase / reduction step, wherein the wave resistance increase / reduction step is provided below the flare height in a side view.   The hull structure provided with the wave resistance increase / reduction step according to claim 1, wherein the wave resistance increase / reduction step is increased toward the rear of the hull.   9. The hull structure having a wave resistance increase / reduction step according to claim 6 or 8, wherein an outer surface of the wave resistance increase / reduction step is formed in a peeling shape for peeling waves. The ship structure having a wave resistance increase / reduction step according to claim 6 or 9 , wherein the peeling shape is a hollow shape and / or a protruding shape.