JP5055302B2 - Ship vibration suppression device and ship - Google Patents

Description

  The present invention relates to a vibration suppression device for a ship that suppresses vibrations generated in the bossing of the ship and a ship to which the vibration suppression device is applied.

  In some ships, a skeg that holds a propeller shaft covers the propeller shaft and includes a boshing formed integrally with a stern portion of a hull. Such a bossing is shaped to bulge downward at the bottom of the ship, and the water flow becomes uneven due to cavitation or the like behind it. For this reason, the propeller behind the boshing swings in a direction perpendicular to the propulsion direction of the ship (mainly the left-right direction) based on the propeller shaft, which becomes vibration of the boshing and hinders the propulsion of the ship. There is a fear. In order to solve such a problem, it is conceivable to increase the rigidity of the inside of the boshing by suppressing the vibration by increasing the thickness of the reinforcing member inside the boshing or by narrowing the interval between the reinforcing members. However, even if the rigidity inside the boshing is increased, the vibration of the propeller is still not improved, so that it is not sufficient to suppress the vibration of the boshing.

  In addition, in order to improve the propulsion performance of a ship, a rectifying fin that is attached to the outside of a hull and arranges a water flow is known (see, for example, Patent Document 1).

JP 2002-137789 A

  However, although the rectifying fin as disclosed in Patent Document 1 contributes to the improvement of the propulsion performance of the ship, it does not have the effect of suppressing the vibration generated in the bossing by increasing the rigidity of the bossing.

  SUMMARY OF THE INVENTION The present invention solves the above-described problems, and it is an object of the present invention to provide a marine vessel vibration suppression device and a marine vessel that can increase the rigidity of the boshing to improve the left and right runout of the propeller and suppress the vibration generated in the boshing. And

In order to achieve the above-mentioned object, in the vibration suppression device for a ship of the present invention, a plate-like protrusion provided to extend outward from the left and right side parts of the boshing formed on the stern side bottom of the ship. And a wing provided extending in the vertical direction from the extending end of the plate-like protrusion, and the wing has a thickness H in the left-right direction with respect to the outer plate thickness t of the boshing. 1.0 ≦ H / t ≦ 10.0, and the height B in the vertical direction is set to B <R with respect to the wing length R of the propeller in the ship, and the plate-like protrusion is The plate thickness T is set in a range of 1.0 ≦ T / t ≦ 10.0 with respect to the outer plate thickness t of the boshing, and the protruding length L is 10 [mm] ≦ the blade length R of the propeller. It is set to the range of L <= R / 2 .

  According to this marine vibration suppressing device, the bossing is reinforced from the outside by the wings attached to the left and right sides of the bossing through the protrusions. For this reason, sufficient rigidity is given to the bossing to suppress the vibration of the propeller in the left-right direction. As a result, it is possible to suppress vibration that occurs in the bossing.

  According to this marine vibration suppressing device, the rigidity suitable for suppressing the lateral vibration of the propeller is imparted to the bossing, so that the vibration generated in the bossing can be appropriately suppressed.

  Further, in the marine vibration suppressing device of the present invention, the wing portion is formed along the outer surface of the boshing within a range from a partition wall portion separating the boshing and the hull to a rear end of the boshing. It is characterized by.

  Propeller run-out occurs on the basis of a propeller shaft, and this propeller shaft protrudes from the bulkhead to the outside of the hull and is supported by a bossing. In other words, in order to suppress propeller runout caused by the propeller shaft, it is only necessary to increase the rigidity of the boshing within the range from the partition wall, which is the range of the propeller shaft protruding from the hull, to the rear end of the boshing. Therefore, according to this marine vibration suppressing device, vibration generated in the bossing can be appropriately suppressed by suitably suppressing the lateral vibration of the propeller that occurs based on the propeller shaft.

  In the vibration suppression device for a ship according to the present invention, the plate-like projecting portion and the wing portion are disposed on the left and right outer portions of the propeller shaft covered with the boshing.

  According to this marine vibration suppressing device, the left and right runout of the propeller generated based on the propeller shaft can be suitably suppressed, and the vibration generated in the boshing can be appropriately suppressed.

  In the marine vibration suppressing device of the present invention, the wing portion is formed in such a manner as to gradually approach the outer surface of the boshing from the front side to the rear side of the hull.

  According to this marine vibration suppression device, the passage formed between the wing and the outer surface of the boshing is narrowed from the front side to the rear side. The water gradually increases toward the side, and this increased speed is sent to the propeller. As a result, the propulsive force of the propeller can be supplemented, and the propulsion performance of the ship can be improved.

  In the vibration suppression device for a ship according to the present invention, the wing portion is provided with its front end continuous with the outer surface of the boshing.

  According to this marine vibration suppressing device, when the marine vessel is propelled, the flowing water outside the wing is continuously and smoothly guided from the outer surface of the bossing. As a result, the running water on the left and right sides of the hull can be adjusted.

  Further, in the marine vibration suppressing device of the present invention, the plate-like protrusion is formed continuously along the longitudinal direction of the wing, and the plate-like protrusion and the wing are formed by a boshing. The rear ends of the wings on the left and right outer sides are formed toward the downstream side in the rotation direction of the propeller.

  According to this marine vibration suppressing device, flowing water is guided toward the downstream side in the rotation direction of the propeller during propulsion of the marine vessel. For this reason, rotation of the propeller is assisted. As a result, the propulsive force of the propeller can be supplemented, and the propulsion performance of the ship can be improved.

  Further, in the marine vibration suppressing device of the present invention, the plate-like protrusion is formed intermittently along the longitudinal direction of the wing, and the rear end of the left and right outer sides of the bossing is arranged in the direction of rotation of the propeller. It arrange | positions in the aspect which faces downstream.

  According to this marine vibration suppressing device, when the marine vessel is propelled, running water is guided toward the downstream side in the rotation direction of the propeller by the projecting portion. For this reason, rotation of the propeller is assisted. As a result, the propulsive force of the propeller can be supplemented, and the propulsion performance of the ship can be improved.

  In the vibration suppression device for a ship according to the present invention, a plurality of the plate-like protrusions are provided along the wing part, and form a tunnel-like passage together with the outer surface of the boshing and the wing part. To do.

  According to this marine vibration suppression device, the cross-sectional shape forms a gate shape due to the plurality of protrusions, so that the left-right rigidity of the boshing is further improved, and the vibration generated in the boshing is suitably suppressed by the left-right deflection of the propeller. Can be appropriately suppressed. And at the time of propulsion of a ship, running water is allowed to pass through the passage, so that running water on the left and right sides of the hull can be adjusted.

  In order to achieve the above-described object, in the ship of the present invention, in a ship in which a boss is formed on the stern side bottom, vibration suppression for ships according to any one of claims 1 to 9 with respect to the boss. A device is provided.

  According to this ship, vibration generated in the bossing can be suppressed. Moreover, the propulsion performance of the ship can be improved. Moreover, the running water of the left and right sides of the hull can be adjusted.

  According to the present invention, the vibration generated in the bossing can be suppressed by increasing the rigidity of the bossing and improving the left-right deflection of the propeller.

FIG. 1 is a schematic side view showing a stern of a ship to which a ship vibration suppression device according to a first embodiment of the present invention is applied. 2 is a cross-sectional view taken along line AA in FIG. FIG. 3 is a schematic plan view of FIG. FIG. 4 is an AA cross-sectional view showing another shape of the wing portion. FIG. 5 is an AA cross-sectional view showing another shape of the wing portion. FIG. 6 is a schematic plan view showing a stern of a ship to which the vibration suppression device for a ship according to the second embodiment of the present invention is applied. FIG. 7 is a schematic plan view showing a stern of a ship to which the vibration suppression device for a ship according to the third embodiment of the present invention is applied. FIG. 8: is a schematic side view which shows the stern of the ship to which the vibration suppression apparatus for ships concerning Embodiment 4 of this invention is applied. FIG. 9: is a schematic side view which shows the stern of the ship to which the vibration suppression apparatus for ships concerning Embodiment 5 of this invention is applied. FIG. 10 is an AA cross-sectional view showing another shape of the protruding portion.

  Hereinafter, embodiments of a vibration suppression device for a ship and a ship according to the present invention will be described in detail with reference to the drawings. Note that the present invention is not limited to the embodiments. In addition, constituent elements in the following embodiments include those that can be easily replaced by those skilled in the art or those that are substantially the same.

[Embodiment 1]
1 is a schematic side view showing a stern of a ship to which a vibration suppression device for a ship according to a first embodiment of the present invention is applied, FIG. 2 is a cross-sectional view taken along line AA in FIG. 1, and FIG. A schematic plan view, FIG. 4 and FIG. 5 are AA sectional views showing other shapes of the wing portion.

  A rudder 2 is provided at the bottom of the stern 11 of the hull 1 in the ship. A propeller 3 is provided on the bottom of the hull 1 that is in front of the rudder 2. The propeller 3 is supported by a skeg 4 on a propeller shaft 31 that is a rotating shaft thereof. The skeg 4 constitutes a bossing 41 that covers the propeller shaft 31 and is formed integrally with the ship bottom of the hull 1.

  The outer shape of the bossing 41 is continuously formed with a smooth curve with respect to the outer surface of the hull 1 so as to bulge downward from the bottom of the hull at the center in the left-right width direction of the hull 1. Further, the bossing 41 is smoothly curved so that the outer shape gradually narrows toward the propeller 3 (from the front to the rear), and the propeller 3 is disposed at the most narrowed rear end.

  A ship vibration suppression device (hereinafter referred to as a vibration suppression device) 5 according to the present embodiment is provided for such a ship. The vibration suppressing device 5 includes a plate-like protrusion 51 and a wing 52.

  The protruding portion 51 is made of a plate-shaped steel plate material provided to extend outward from the left and right side portions of the bossing 41. In FIG. 2, the protrusion 51 extends horizontally from the left and right sides of the bossing 41 to the outside. However, the protrusion 51 may extend diagonally upward or diagonally downward. It may be provided so as to be curved upward or downward.

  The wing part 52 is fixed to the extending end of the protruding part 51, and is provided so as to extend in the vertical direction from the extending end of the protruding part 51. The wing portion 52 has a guide surface 52 a that faces the outer surface 41 a of the bossing 41. 2 and 3 is made of a plate-shaped steel plate material formed in the longitudinal direction in the front-rear direction of the bossing 41, and the projecting portion so that one surface of the steel plate material becomes a guide surface 52a. 51 is fixed to the extending end. That is, the wing portion 52 is formed such that a guide surface 52 a facing the outer side surface 41 a of the side portion of the boshing 41 extends in the longitudinal direction of the boshing 41. In addition, the wing | blade part 52 does not need to be plate shape, if it has the guide surface 52a which opposes the outer surface 41a of the boshing 41 and is extended in the front-back direction of the boshing 41 longitudinally.

  As described above, the vibration suppression device 5 according to the embodiment shown in FIGS. 1 to 3 is fixed to the protruding portion 51 that extends outward from the left and right side portions of the bossing 41 and the extending end of the protruding portion 51. , And a wing part 52 having a guide surface 52a that is formed in the longitudinal direction in the front-rear direction of the bossing 41, and the wing part 52 extends upward from the extending end of the protruding part 51. The cross section is formed in a transverse T-shape extending downward. As shown in FIG. 3, the vibration suppressing device 5 extends in the front-rear direction, and the guide surface 52 a of the wing portion 52 protrudes along the outer shape of the boshing 41 at equal intervals with respect to the outer surface 41 a of the boshing 41. A part 51 and a wing part 52 are formed.

  According to such a configuration, the bossing 41 is reinforced from the outside by the wings 52 attached to the left and right side parts of the bossing 41 via the protrusions 51. For this reason, sufficient rigidity is imparted to the boshing 41 to suppress the lateral vibration of the propeller 3 based on the propeller shaft 31. As a result, it is possible to suppress the vibration generated in the bossing 41.

  In addition, although the wing | blade part 52 is being fixed in the form perpendicular | vertical to the extension end of the protrusion part 51 in FIG. 2, it is not restricted to this. For example, as shown in FIG. 4, the wing portion 52 may be fixed to the extending end of the protruding portion 51 with the guide surface 52 a inclined upward. As shown in FIG. 5, the wing 52 may be provided curved outward with the guide surface 52 a facing upward.

  As shown in FIG. 2, the vibration suppression device 5 is formed with a protruding portion 51 and a wing portion 52, and the cross section is formed in a lateral T shape. Not only this but the cross section of the vibration suppression apparatus 5 may be formed in horizontal L shape (not shown). The lateral L-shaped wing portion 52 may be provided so as to extend only above the hull 1 from the extending end of the projecting portion 51, or provided so as to extend only below the hull 1. It may be.

Here, the prescription | regulation of the suitable dimension for suppressing the vibration which arises in the bossing 41 with the vibration suppression apparatus 5 is demonstrated. In general, the geometrical moment of inertia I in the cross-sectional thickness H in cross-sectional width B ^{is I = BH 3/12 [m} 4], cross-sectional thickness H relative to cross-sectional width B is to come into play in the cube Become. When this is replaced with the structure of the vibration suppression device 5 described above, the lateral rigidity K (K = IE, E: Young's modulus) is improved, and the natural frequency F (F = √ (K / M), M: mass). In order to increase the height, it is preferable to increase the thickness H in the left-right direction rather than increasing the height B in the vertical direction of the wing part 52. From this point, the thickness H in the left-right direction of the wing portion 52 is preferably set in a range of 1.0 ≦ H / t ≦ 10.0 with respect to the outer plate thickness t of the bossing 41. Since the outer plate thickness t of the general boshing 41 is about 25 [mm], the thickness H in the left-right direction of the wing portion 52 is in the range of 25 [mm] ≦ H ≦ 250 [mm]. Further, the height B in the vertical direction is preferably B <R with respect to the blade length R of the propeller 3. On the other hand, regarding the protrusion 51, the plate thickness T is in the range of 1.0 ≦ T / t ≦ 10.0 (ie 25 [mm] ≦ T ≦ 250 [mm]) with respect to the outer plate thickness t of the boshing 41. The protrusion length L is preferably set in the range of 10 [mm] ≦ L ≦ R / 2 with respect to the blade length R of the propeller 3.

  According to such a configuration, rigidity suitable for suppressing the lateral vibration of the propeller 3 based on the propeller shaft 31 is imparted to the boshing 41, and vibration generated in the boshing 41 can be appropriately suppressed. Become.

  Further, as shown in FIG. 1, the wing portion 52 is preferably formed in a longitudinal shape within a range W extending from a portion of the partition wall 12 separating the boshing 41 and the hull 1 to the rear end of the boshing 41. .

  The swing of the propeller 3 occurs based on the propeller shaft 31, and the propeller shaft 31 protrudes from the bulkhead 12 to the outside of the hull 1 and is supported by the boshing 41. In other words, in order to suppress the swing of the propeller 3 that occurs based on the propeller shaft 31, the rigidity of the boshing 41 in the range W from the part of the bulkhead 12 that is the range of the propeller shaft 31 protruding from the hull 1 to the rear end of the boshing 41 is set. Just increase. Therefore, according to such a configuration, it is possible to appropriately suppress the vibration generated in the bossing 41 by suitably suppressing the vibration of the propeller 3 generated based on the propeller shaft 31. The range W from the partition wall 12 to the rear end of the boshing 41 corresponds to the length of the boshing 41 in the front-rear direction.

  In addition, as shown in FIGS. 1 and 2, in the vibration suppression device 5, it is preferable that the protruding portion 51 and the wing portion 52 are disposed at the left and right outer portions of the propeller shaft 31.

  As described above, the swing of the propeller 3 occurs based on the propeller shaft 31. For this reason, if the protrusion part 51 and the wing | blade part 52 are arrange | positioned in the site | part of the right and left outer side of the propeller shaft 31, the vibration of the propeller 3 which arises based on the propeller shaft 31 can be suppressed suitably, and the vibration which arises in the boshing 41 Can be appropriately suppressed.

[Embodiment 2]
FIG. 6 is a schematic plan view showing a stern of a ship to which the vibration suppression device for a ship according to the second embodiment of the present invention is applied. As shown in FIG. 6, the vibration suppressing device 5 is formed in such a manner that the protruding portion 51 and the wing portion 52 reach the guide surface 52 a of the wing portion 52 from the front side to the rear side and gradually approach the outer surface 41 a of the bossing 41. ing.

  According to such a configuration, the passage formed between the guide surface 52a of the wing 52 and the outer surface 41a of the bossing 41 is narrowed from the front side to the rear side. The running water gradually increases from the front side toward the rear side, and the flowing water with the increased speed is sent toward the propeller 3. For this reason, the propulsive force by the propeller 3 can be supplemented, and the propulsion performance of the ship can be improved.

[Embodiment 3]
FIG. 7 is a schematic plan view showing a stern of a ship to which the vibration suppression device for a ship according to the third embodiment of the present invention is applied. As shown in FIG. 7, in the vibration suppression device 5, the wing portion 52 is provided such that the outer front end thereof is continuous with the outer surface 41 a of the boshing 41.

  According to such a configuration, the water flowing outside the wing portion 52 is continuously and smoothly guided from the outer surface 41 a of the bossing 41 during the propulsion of the ship. For this reason, it becomes possible to arrange the flowing water of the left and right sides of the hull 1.

[Embodiment 4]
FIG. 8: is a schematic side view which shows the stern of the ship to which the vibration suppression apparatus for ships concerning Embodiment 4 of this invention is applied. As shown in FIG. 8, in the vibration suppression device 5, the protruding portion 51 is continuously formed along the longitudinal direction of the wing portion 52. The projecting portion 51 and the wing portion 52 are formed with the rear end of each wing portion 52 facing the downstream side in the rotation direction of the propeller 3 on the left and right outer sides of the boshing 41. Here, when the propeller 3 rotates rightward when viewed from the front side of the hull 1, the propeller 3 rotates from below to above on the right side of the hull 1 as shown in FIG. 3 on the downstream side in the rotation direction. Therefore, on the right side of the hull 1, the protruding portion 51 and the wing portion 52 are formed with the rear end of the wing portion 52 facing upward on the downstream side in the rotation direction of the propeller 3. On the other hand, as shown in FIG. 8B, since the propeller 3 is rotating from the upper side to the lower side on the left side of the hull 1, the lower side is the downstream side in the rotation direction of the propeller 3. Therefore, on the left side of the hull 1, the protruding portion 51 and the wing portion 52 are formed with the rear end of the wing portion 52 facing downward on the downstream side in the rotation direction of the propeller 3.

  According to such a configuration, flowing water is guided toward the downstream side in the rotation direction of the propeller 3 by the projecting portion 51 and the wing portion 52 during propulsion of the ship. For this reason, rotation of the propeller 3 is assisted. As a result, the propulsive force by the propeller 3 can be supplemented, and the propulsion performance of the ship can be improved.

[Embodiment 5]
FIG. 9: is a schematic side view which shows the stern of the ship to which the vibration suppression apparatus for ships concerning Embodiment 5 of this invention is applied. As shown in FIG. 9, in the vibration suppression device 5, the protrusions 51 (51 a, 51 b, 51 c, 51 d, 51 e) are intermittently connected to a plurality (five in this embodiment) along the longitudinal direction of the wing part 52. And are arranged in a louver shape. Specifically, the protrusions 51 (51 a, 51 b, 51 c, 51 d, 51 e) are arranged in such a manner that the rear ends are directed to the downstream side in the rotation direction of the propeller 3 on the left and right outer sides of the bossing 41. Here, when the propeller 3 is rotating rightward as viewed from the front side of the hull 1, the propeller 3 is rotating from below to above on the right side of the hull 1 as shown in FIG. 3 on the downstream side in the rotation direction. Therefore, on the right side of the hull 1, the projecting portions 51 a, 51 b, 51 c, 51 d, 51 e that are formed intermittently are formed with their rear ends facing upward on the downstream side in the rotation direction of the propeller 3. On the other hand, as shown in FIG. 9B, since the propeller 3 is rotating from the upper side to the lower side on the left side of the hull 1, the lower side is the downstream side in the rotation direction of the propeller 3. Therefore, on the left side of the hull 1, the projecting portions 51 a, 51 b, 51 c, 51 d, 51 e formed intermittently are formed with their rear ends facing downward on the downstream side in the rotation direction of the propeller 3.

  According to such a configuration, running water is guided toward the downstream side in the rotation direction of the propeller 3 by the protrusions 51 (51a, 51b, 51c, 51d, 51e) during the propulsion of the ship. For this reason, rotation of the propeller 3 is assisted. As a result, the propulsive force by the propeller 3 can be supplemented, and the propulsion performance of the ship can be improved.

[Embodiment 6]
FIG. 10 is an AA cross-sectional view showing another shape of the protruding portion according to the sixth embodiment of the present invention. As shown in FIG. 10, in the vibration suppression device 5, a plurality of protrusions 51 are provided in parallel along the longitudinal direction of the wing 52 (two in the present embodiment: reference numerals 51-1 and 51-2). The tunnel-shaped passage 6 is preferably formed together with the outer side surface 41 a of the bossing 41 and the guide surface 52 a of the wing portion 52.

  According to such a configuration, the plurality of protrusions 51-1 and 51-2 have a gate-like cross-sectional shape, so that the left-right rigidity of the boshing 41 is further improved and the left-right deflection of the propeller 3 is suitably suppressed. Thus, it is possible to appropriately suppress the vibration generated in the bossing 41. In addition, when the ship is propelled, it is possible to adjust the flowing water on the left and right sides of the hull 1 by passing the flowing water through the passage 6.

  Moreover, according to the ship to which the vibration suppressing device 5 of each embodiment described above is applied, it is possible to suppress vibration generated in the bossing 41. And it becomes possible to improve the propulsion performance of a ship. Moreover, it becomes possible to arrange the flowing water of the left and right sides of the hull 1.

  As described above, the marine vessel vibration suppression device and the marine vessel according to the present invention are suitable for suppressing the vibration generated in the bossing by increasing the rigidity of the bossing and improving the propeller shake.

DESCRIPTION OF SYMBOLS 1 Hull 11 Stern 12 Bulkhead 2 Rudder 3 Propeller 31 Propeller shaft 4 Skeg 41 Bossing 41a Outer side surface 5 Vibration suppression device 51 (51a, 51b, 51c, 51d, 51e, 51-1, 51-2) Protrusion part 52 Wing part 52a Guide surface 6 Passage B Height of wing part in the vertical direction H Thickness of wing part in the left-right direction R Propeller blade length t Outer plate thickness of the boshing T Thickness of the protrusion L L Projection length of the protrusion

Claims (9)

A plate-like protrusion provided to extend outward from the left and right sides of the boshing formed on the stern side bottom of the ship;
A wing provided extending in the vertical direction from the extending end of the plate-like protrusion,
Equipped with a,
The wing portion has a thickness H in the left-right direction set in a range of 1.0 ≦ H / t ≦ 10.0 with respect to the outer plate thickness t of the boshing, and a height B in the vertical direction is a propeller in the ship. B <R with respect to the blade length R of
The plate-like protruding portion has a plate thickness T set in a range of 1.0 ≦ T / t ≦ 10.0 with respect to the outer plate thickness t of the boshing, and a protruding length L is the blade length of the propeller. It is set in the range of 10 [mm] ≦ L ≦ R / 2 with respect to R.
A marine vibration suppression apparatus characterized by the above. The wings, according to claim 1, characterized in that from the site of partition wall separating between the bossing and the hull are formed along the outer surface of the bossing within leading to the rear end of the bossing Vibration suppressor for ships. The plate-like projections and the wings, marine vibration suppressing device according to claim 1 or 2, characterized in that it is arranged in a portion of the left and right outside of the propeller shaft which is covered with the bossing. The ship wing suppression according to any one of claims 1 to 3 , wherein the wing portion is formed in such a manner that it extends from the front side to the rear side of the hull and gradually approaches the outer side surface of the boshing. apparatus. The wings, marine vibration suppressing device according to any one of claims 1 to 3, characterized in that is provided continuously to the front end and an outer surface of the bossing. The plate-like protrusion is formed continuously along the longitudinal direction of the wing,
The plate-like projections and the wings, the preceding claims, characterized in that the rear end of each of the wings of the left and right outer bossing, are formed toward the downstream side in the rotational direction of the propeller The vibration suppression apparatus for ships as described in any one of these. The plate-like projecting portion is formed intermittently along the longitudinal direction of the wing portion, and is arranged in such a manner that the rear end is directed to the downstream side in the rotation direction of the propeller with respect to the left and right outer sides of the bossing. The ship vibration suppression device according to any one of claims 1 to 5 , The plate-like projection, a plurality provided along the wings, in any one of claims 1 to 7, characterized in that forming a tunnel-like passage with the outer surface and the wings of the bossing The vibration suppression apparatus for ships as described. In a ship with a boss on the stern side bottom,
A ship, wherein the ship vibration suppression device according to any one of claims 1 to 8 is provided for the boshing.

Images