JP2019119215A - Antimotion device using swirling flow and antimotion method using swirling flow - Google Patents

Abstract

To provide an antimotion device using swirling flow capable of actively controlling an antimotion effect imparted to structures such as a vessel or a floating body and in addition capable of reducing swinging motion in a wide frequency range without being dependent on a specific frequency of the structure and an antimotion method using the swirling flow.SOLUTION: An antimotion device includes: liquid storage means 10 in an annular shape in a plan view mounted on a structure 2 for storing liquid 20 with space X remaining above the liquid 20; swirling flow generation means 30 for generating a swirling flow in the liquid 20; and swirling flow control means 40 for controlling the swirling flow generation means 30 and the swirling flow is controlled.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a shake reducing device and a shake reducing method for reducing swinging of a structure such as a ship or a floating body.

  As a device for reducing the sway of a structure such as a ship or a floating body, a fluid type anti-swing device represented by an anti-rolling tank (ART) is used. The anti-rolling tank can reduce the sway of the structure by moving the liquid in the tank mounted on the structure.

Further, Patent Document 1 discloses a rotational vibration damping device that includes a gyro that rotates at a high speed, a gimbal that supports this gyro, and the like to suppress rotational vibration of a boat / ship, ski gondola, ropeway, etc. It is done.
In addition, Patent Document 2 includes a housing in which a flow path through which a fluid circulates is formed, an electrode unit to which a voltage is applied to generate a flow in the fluid, and the like, and a fluid rate gyro that measures angular velocities of three axes. Is disclosed.
Further, in Patent Document 3, in a fluid gyro, a fluid whose apparent viscosity changes in response to a change in an applied electric field is enclosed in a hollow annular portion so as to be circulateable, and an external force exceeding an allowable amount is When detected, a method is disclosed that changes the restoring force by applying an electric field to the fluid.
Further, Patent Document 4 includes a rotor exhibiting characteristics as a gyroscope at high speed rotation, two shafts connected via the rotor and a gear, brake means for braking the shaft, a ballast tank and the like. And a gyroscopic stabilizer for stabilizing the attitude of the vehicle.

Unexamined-Japanese-Patent No. 5-272585 JP, 2011-149765, A JP 2001-33354 A Japanese Patent Publication No. 48-40233

  However, a fluid anti-rolling device represented by a conventional anti-rolling tank acts passively on the sway of the structure, and therefore reduces the sway when vibration characteristics such as the natural frequency of the structure change. There is a problem that the effect is significantly reduced. In addition, the conventional fluid type vibration reducing device only responds to rolling in one direction of rolling or pitching, and L / B (L: length, B: width) decreases. It is insufficient as a measure to reduce the vibration of such work vessels and floating offshore plants.

Also, as in the case of the rotational vibration damping device described in Patent Document 1 and the gyro type stabilizer described in Patent Document 4, the mechanical vibration reducing device using a gyro is complicated in structure and control, and is durable. There are issues in terms of gender and cost. Also, due to its structure, it is difficult to apply to large structures such as ships and floating bodies.
Moreover, the fluid rate gyro described in Patent Document 2 measures the angular velocity of three axes, and does not relate to a reduction gear device.
Further, the fluid gyro described in Patent Document 3 is to attach a plurality of electrode plates and a container for sealing a special fluid and apply a voltage to change the restoring force, resulting in a complicated structure. .

  Therefore, the present invention enables active control of the rocking reduction effect that reduces the rocking of a structure such as a ship or floating body, and also enables rocking in a wide frequency range regardless of the natural frequency of the structure. It is an object of the present invention to provide an anti-sway apparatus using a swirling flow and an anti-swing method using a swirling flow.

In the anti-swing apparatus using a swirling flow corresponding to claim 1, the liquid storage means mounted on a structure and having an annular annular shape in plan view for storing the liquid leaving a space above the liquid; It is characterized in that it comprises swirling flow generating means for generating a swirling flow in a liquid and swirling flow control means for controlling the swirling flow generating means, and reduces swinging of the structure by controlling the swirling flow.
According to the first aspect of the present invention, it is possible to actively control the rocking effect by utilizing the fluid force generated from the centrifugal force or the like of the swirling flow. Further, by controlling the swirling flow, it is possible to reduce vibration in a wide frequency range without depending on the natural frequency of the structure.

The present invention according to claim 2 is characterized in that the swirling flow control means controls the velocity of the swirling flow.
According to the second aspect of the present invention, it is possible to adjust the reduction effect by controlling the speed of the swirling flow.

The present invention according to claim 3 comprises a liquid supply / recovery means for supplying and recovering liquid, and the height of the space is increased or decreased by increasing or decreasing the amount of liquid stored in the liquid storage means by the liquid supply / recovery means. To adjust.
According to the third aspect of the present invention, the reduction effect can be easily adjusted by increasing or decreasing the amount of liquid.

The present invention according to claim 4 is characterized in that the swirling flow generating means doubles as a liquid supply / recovery means.
According to the fourth aspect of the present invention, since the liquid supply / recovery means can be configured with fewer devices, the installation location, cost and the like can be reduced.

The present invention according to claim 5 is characterized in that the liquid storage means is provided with a top plate and raising and lowering means for raising and lowering the top plate, and the height of the space is adjusted by raising and lowering the top plate by the raising and lowering means.
According to the fifth aspect of the present invention, when the flow rate of the liquid level or the swirling flow is changed, the height of the space can be easily corrected to the optimum height. In addition, it is possible to adjust the reduction effect by changing the size of the liquid in contact with the top plate.

The present invention according to claim 6 is such that (hc + hw) / hw exceeds 1 when the height of the space is hc and the height from the bottom of the liquid storage means to the liquid surface is hw. It is characterized by being set to 6 or less.
According to the sixth aspect of the present invention, the swirling flow can be easily brought into contact with the top surface or the top plate of the liquid storage means, and a higher reduction effect can be obtained.

The present invention according to claim 7 is characterized in that a swing detection means for detecting a swing of a structure is provided, and the swirling flow is controlled according to the magnitude of the swing of the structure detected by the swing detection means. Do.
According to the seventh aspect of the present invention, it is possible to more appropriately adjust the reduction effect according to the magnitude of the swing of the structure.

The present invention according to claim 8 is characterized in that the swirling flow control means controls the swirling flow such that the dimension in which the swirling flow contacts the top surface of the liquid storage means or the top plate is in a predetermined range.
According to the eighth aspect of the present invention, it is possible to obtain a higher anti-sway effect.

The present invention according to claim 9 is characterized in that the outer part of the bottom of the liquid storage means is curved.
According to the ninth aspect of the present invention, it is possible to increase the liquid level or the amount of bulge of the liquid when the swirling flow is generated.

The present invention according to claim 10 is characterized in that the structure is a ship or a floating body floating on water.
According to the tenth aspect of the present invention, it is possible to reduce the swing of the ship or the floating body by utilizing the fluid force generated from the centrifugal force of the swirling flow or the like. In addition, it is possible to reduce vibration in a wide frequency range corresponding to waves and the like without depending on the natural frequency of the ship or the floating body.

According to claim 11 of the present invention, there is provided a method of reducing swing using swirling flow according to claim 11, wherein the liquid is housed in a liquid storage means having an annular shape in plan view mounted on the structure, leaving a space above the liquid. By generating a swirling flow in the liquid and controlling the swirling flow, it is characterized in that the fluctuation of the structure is reduced.
According to the eleventh aspect of the present invention, it is possible to actively control the reduction effect by utilizing the fluid force generated from the centrifugal force or the like of the swirling flow. Further, by controlling the swirling flow, it is possible to reduce vibration in a wide frequency range without depending on the natural frequency of the structure.

The invention according to claim 12 is characterized in that the velocity of the swirling flow is controlled.
According to the present invention as set forth in claim 12, it is possible to adjust the reduction effect by controlling the speed of the swirling flow.

The invention according to claim 13 is characterized in that the height of the space is adjusted by increasing or decreasing the amount of liquid stored in the liquid storage means.
According to the present invention as set forth in claim 13, it is possible to easily adjust the reduction effect by increasing or decreasing the amount of liquid.

The present invention according to claim 14 is characterized in that the height of the space is adjusted by moving up and down the top plate provided in the liquid storage means.
According to the present invention as set forth in claim 14, when the flow rate of the liquid level or the swirling flow is changed, the height of the space can be easily corrected to the optimum height. In addition, it is possible to adjust the reduction effect by changing the size of the liquid in contact with the top plate.

The present invention according to claim 15 is such that (hc + hw) / hw exceeds 1 when the height of the space is hc and the height from the bottom of the liquid storage means to the liquid surface is hw. It is characterized by being set to 6 or less.
According to the fifteenth aspect of the present invention, the swirling flow can be easily brought into contact with the top surface or the top plate of the liquid storage means, and a higher reduction effect can be obtained.

The invention according to claim 16 is characterized in that the swirling flow is controlled so that the dimension in which the swirling flow comes in contact with the upper surface of the liquid storage means or the top plate is within a predetermined range.
According to the sixteenth aspect of the present invention, it is possible to obtain a higher anti-rocking effect.

  According to the swinging device of the present invention, the swinging effect can be actively controlled using fluid force generated from the centrifugal force of the swirling flow and the like. Further, by controlling the swirling flow, it is possible to reduce vibration in a wide frequency range without depending on the natural frequency of the structure.

  Further, when the swirling flow control means controls the velocity of the swirling flow, it is possible to adjust the reduction effect by controlling the velocity of the swirling flow.

  In the case of adjusting the height of the space by providing a liquid supply and recovery means for supplying and recovering the liquid, and adjusting the amount of liquid stored in the liquid storage means by the liquid supply and recovery means, The reduction effect can be easily adjusted by increasing or decreasing the amount of liquid.

  Further, when the swirling flow generating means also serves as the liquid supply / recovery means, the liquid supply / recovery means can be configured with fewer devices, so that the installation location, cost and the like can be reduced.

  In addition, when the liquid storage means is provided with a top plate and raising and lowering means for raising and lowering the top plate, and the height of the space is adjusted by raising and lowering the top plate by the raising and lowering means, the liquid level or the flow velocity of the swirling flow is changed In addition, it is easy to correct the height of the space to the optimum height. In addition, it is possible to adjust the reduction effect by changing the size of the liquid in contact with the top plate.

  When the height of the space is hc, and the height from the bottom of the liquid storage means to the liquid surface is hw, (hc + hw) / hw is set to more than 1 and not more than 1.6. This makes it easy to bring the swirling flow into contact with the top surface or top plate of the liquid storage means, and a higher effect of reducing the swing can be obtained.

  In addition, when the swing detection means is provided to detect the swing of the structure, and the swing flow is controlled according to the magnitude of the swing of the structure detected by the swing detection means, the magnitude of the swing of the structure Depending on the anti-sway effect can be adjusted more appropriately.

  In addition, when the swirling flow control means controls the swirling flow so that the dimension in which the swirling flow contacts the upper surface of the liquid storage means or the top plate is in a predetermined range, a higher reduction effect can be obtained. it can.

  In addition, when the outer portion of the bottom of the liquid storage means has a curved surface, it is possible to increase the liquid level or the amount of protrusion of the liquid when the swirling flow is generated.

  Also, in the case where the structure is a floating body floating on a ship or water, it is possible to reduce the swing of the ship or floating body by utilizing the fluid force generated from the centrifugal force of the swirling flow or the like. In addition, it is possible to reduce vibration in a wide frequency range corresponding to waves and the like without depending on the natural frequency of the ship or the floating body.

  According to the swing reducing method of the present invention using the swirling flow, it is possible to actively control the swinging reduction effect by utilizing the fluid force generated from the centrifugal force or the like of the swirling flow. Further, by controlling the swirling flow, it is possible to reduce vibration in a wide frequency range without depending on the natural frequency of the structure.

  In addition, when controlling the speed of the swirling flow, it is possible to adjust the reduction effect by controlling the speed of the swirling flow.

  Further, in the case of adjusting the height of the space by increasing or decreasing the amount of liquid stored in the liquid storage means, it is possible to simply adjust the reduction effect by increasing or decreasing the amount of liquid.

  Also, when adjusting the height of the space by raising and lowering the top plate provided in the liquid storage means, it is easy to correct the height of the space to an optimum height when the flow rate of the liquid level or the swirling flow is changed. Become. In addition, it is possible to adjust the reduction effect by changing the size of the liquid in contact with the top plate.

  When the height of the space is hc, and the height from the bottom of the liquid storage means to the liquid surface is hw, (hc + hw) / hw is set to more than 1 and not more than 1.6. This makes it easy to bring the swirling flow into contact with the top surface or top plate of the liquid storage means, and a higher effect of reducing the swing can be obtained.

  Further, in the case where the swirling flow is controlled so that the dimension in which the swirling flow contacts the upper surface of the liquid storage means or the top plate is in a predetermined range, a higher reduction effect can be obtained.

The figure which shows the state which mounted the anti-sway apparatus by one Embodiment of this invention in a structure. The figure which shows the constitution of the same swinging device An illustration of the rocking effect by the rocking device The figure which shows the structure of the anti-sway apparatus by other embodiment of this invention. Central cross-sectional view of liquid storage means in anti-swing apparatus according to still another embodiment of the present invention Diagram showing an example of mounting on a structure Diagram showing an example of mounting on a structure Copy of the appearance of the model used for verification Central cross-sectional view of liquid storage means used for verification Relationship between flow velocity and damping ratio Relationship between flow velocity and damping ratio Central cross-sectional view of liquid storage means used for verification

  Hereinafter, a swing reducing device according to an embodiment of the present invention and a swing reducing method according to the present invention will be described.

FIG. 1 is a view showing a state in which the anti-swing device according to the present embodiment is mounted on a structure, wherein the upper part is a top view and the lower part is a side view.
In FIG. 1, a structure 2 is a ship. The anti-swing device 1 is mounted one on each of the bow deck and the stern deck of the ship (structure 2).
The anti-swing apparatus 1 includes a tank (liquid storage means 10) formed in an annular shape having an elliptical shape in plan view. The liquid storage means 10 is installed with the long axis direction as the ship width direction in order to suppress the lateral movement of the structure 2 due to wave wind or the like. In the liquid storage means 10, a liquid 20 such as water is stored. In addition, the liquid storage means 10 can also be comprised using a hose or a tube instead of a tank.

FIG. 2 is a view showing the configuration of the anti-swing device according to the present embodiment, FIG. 2 (a) is a front view, FIG. 2 (b) is a top view, FIG. 2 (c) is a side view, FIG. 2 is a cross-sectional view taken along the line A-A of FIG. 2 (b) when the circulation pump is stopped, and FIG. 2 (e) is a cross-sectional view taken along the line AA of FIG.
In addition to the liquid storage means 10, the anti-swing device 1 includes a swirl flow generation means 30 for generating a swirl flow in the liquid 20, a swirl flow control means 40 for controlling the swirl flow generation means 30, and supply and recovery of the liquid 20. The liquid supply / recovery means 50 to be carried out and the oscillation detection means 60 for detecting oscillation of the structure 2 are provided.

As shown in FIG. 2 (b), the liquid storage means 10 is formed in an elliptical ring shape consisting of a curved pipe portion 10A and a straight pipe portion 10B. Further, as shown in FIG. 2A, the outer portion of the bottom of the liquid storage means 10 is curved.
As shown in FIG. 2D, the liquid level of the liquid 20 stored in the liquid storage means 10 is in a state where the liquid storage means 10 is in a horizontal state and no swirling flow is generated in the liquid 20. In the above, the space X is adjusted to remain above the liquid level.
Here, the space X is a space that occurs above the liquid level and is a space that does not substantially prevent the rise of the liquid level. Therefore, in the liquid storage means 10 shown in FIG. 2, the space X is from the liquid surface to the upper surface 11 inside the liquid storage means 10.

The swirling flow generating means 30 has a circulation pump 31, a suction pipe 32 and an injection pipe 33.
The circulation pump 31 is disposed in an elliptical hole 10 </ b> C surrounded by the liquid storage means 10. The rear end of the suction pipe 32 is connected to the suction port of the circulation pump 31, and the rear end of the injection pipe 33 is connected to the discharge port of the circulation pump 31.
The suction pipe 32 comprises a first suction pipe 32A and a second suction pipe 32B. The tip of the first suction pipe 32A is connected to the outer peripheral side of one straight pipe portion 10B. The tip of the second suction pipe 32B is connected to the outer peripheral side of the other straight pipe portion 10B.
The injection pipe 33 comprises a first injection pipe 33A and a second injection pipe 33B. The tip of the first injection pipe 33A is connected to the inner peripheral side of one straight pipe portion 10B. The tip of the second injection pipe 33B is connected to the inner peripheral side of the other straight pipe portion 10B. Further, the tip of each of the first injection pipe 33A and the second injection pipe 33B is configured to eject the liquid 20 delivered from the circulation pump 31 along the flow direction of the swirling flow generated in the liquid storage means 10. ing.
The swirl flow generation unit 30 configured as described above can generate swirl flow in the liquid storage unit 10 by circulating the liquid 20 in the liquid storage unit 10 by the circulation pump 31.
In the case where a liquid that causes a flow by applying a voltage is stored in the liquid storage unit, an electrode to which the voltage is applied is also a constituent member of the swirl flow generation unit.

The swirl flow control means 40 controls the swirl flow by controlling the swirl flow generation means 30. For example, the swirling flow can be generated by starting the operation of the circulation pump 31, and the swirling flow can be eliminated by stopping the operation of the circulation pump 31.
FIG. 2 (b) shows a state in which the circulation pump 31 is in operation. When the operation of the circulation pump 31 is started, the liquid 20 stored in the liquid storage means 10 is sucked into the circulation pump 31 through the suction pipe 32 and discharged into the liquid storage means 10 through the injection pipe 33. Ru.
As described above, since the liquid 20 discharged from the injection tube 33 is jetted along the flow direction of the swirling flow, a flow occurs in the liquid 20 stored in the liquid storage means 10, and eventually becomes a swirling flow. In FIG. 2 (b), solid arrows indicate the flow direction of the circulating liquid 20, and dotted arrows indicate the flow direction of the swirling flow of the liquid 20 in the liquid storage unit 10.

When a swirling flow is generated, a centrifugal force is generated when the flow direction of the swirling flow of the liquid 20 in the liquid storage means 10 changes, and the liquid 20 stored in the liquid storage means 10 as shown in FIG. The liquid level on the outer peripheral side rises, the liquid level on the inner peripheral side decreases, and a height difference occurs. The fluid force generated from this centrifugal force (inertial force) or the like can be used to actively control so as to reduce the swing of the structure 2. In addition, by controlling the swirling flow, it is possible to reduce vibration in a wide frequency range without depending on the natural frequency of the structure 2.
Further, in the present embodiment, the outer portion of the bottom portion of the liquid storage means 10 is curved, whereby the liquid level or the amount of protrusion of the liquid 20 at the time of the swirl flow can be increased.
It should be noted that if the tip of the suction pipe 32 is connected to the inner peripheral side of the liquid storage means 10, the liquid level on the inner peripheral side of the liquid 20 decreases when a swirling flow is generated. The tip may be exposed and the circulation pump 31 may cause suction failure. Therefore, it is preferable that the tip of the suction pipe 32 be connected to the outer peripheral side where the liquid level of the liquid 20 rises when the swirling flow is generated.
Further, as shown in FIG. 2B, when the tip of the suction pipe 32 is connected to the upstream side of the straight pipe portion 10B and the tip of the injection pipe 33 is connected to the upstream side of the bent pipe portion 10A, It becomes easier to generate a swirling flow.

Further, the swirl flow control means 40 can control the speed of the swirl flow by adjusting the opening ratio of the suction port of the circulation pump 31 to increase or decrease the amount of the liquid 20 injected into the liquid storage means 10. By controlling the speed of the swirling flow, it is possible to adjust the rocking effect by the rocking device 1.
Further, the swirling flow control means 40 controls the swirling flow according to the magnitude of the swing of the structure 2 detected by the swing detection means 60 such as a sensor. Thereby, according to the magnitude | size of the rocking | fluctuation of the structure 2, the rocking-out effect by the rocking-off apparatus 1 can be adjusted more appropriately. The swing detection means 60 may be provided directly to the structure 2 or may be provided to the anti-swing device 1, and any place may be used as long as it can detect the swing of the structure 2 roughly.

The liquid supply / recovery means 50 is provided with a reversible pump (not shown) for transferring the liquid 20. Moreover, you may further provide the storage tank (not shown) which stores the liquid 20. FIG.
The liquid supply / recovery means 50 can increase the amount (liquid level) of the liquid 20 stored in the liquid storage means 10 by supplying the liquid 20 to the liquid storage means 10. Further, by recovering the liquid 20 stored in the liquid storage means 10, the amount of the liquid 20 stored in the liquid storage means 10 can be reduced. The height hc of the space X can be adjusted by increasing or decreasing the amount of the liquid 20 stored in the liquid storage means 10 in this manner. Thereby, the rocking effect by the rocking apparatus 1 can be adjusted simply.
In the liquid storage means 10 shown in FIG. 2, the height from the liquid surface of the liquid 20 to the upper surface 11 is the height hc of the space X. When the liquid level of the liquid 20 (height from the bottom 12 to the liquid level of the liquid storage means 10) is hw, setting (hc + hw) / hw to be more than 1 and not more than 1.6 makes the swirl flow an upper surface It becomes easy to make it contact with 11, and can obtain higher swaying effect.
Further, by controlling the swirling flow so that the dimension in which the swirling flow contacts the upper surface 11 is in a predetermined range when the liquid storage unit 10 is in the horizontal state, a higher reduction effect can be obtained.
Further, the swirl flow generation means 30 may double as the liquid supply / recovery means 50. For example, if the liquid 20 is supplied or recovered via the circulation pump 31, a reversible pump or the like can be omitted, so the installation location and cost can be reduced.

FIG. 3 is an explanatory view of a swinging effect.
In FIG. 3, the liquid storage means 10 of the vibration reduction device 1 is fixed to the structure 2 via the support 3.
FIG. 3A shows the structure 2 in a horizontal state. When the structure 2 is horizontal, the liquid storage means 10 is also horizontal. When a high-speed swirling flow is generated in the liquid storage means 10, the liquid 20 is pushed out in the radial direction by the centrifugal force of the swirling flow, so the liquid level of the liquid 20 on the outer circumferential side rises and The liquid level falls. The dotted arrow in FIG. 3 indicates the rotational direction of the swirling flow.
FIG. 3B shows a state in which the structure 2 tilts due to the occurrence of rocking due to wave wind or the like in the structure 2. When the structure 2 is inclined, the liquid storage means 10 is also inclined, and the liquid 20 in the liquid storage means 10 is biased to the lower side, and the amount of the lower liquid 20 is increased. And, when the liquid 20 is pushed out in the radial direction by the centrifugal force of the swirling flow, the fluid force acting to push back the upper surface 11 and the bottom surface 12 of the inclined liquid storage means 10 is more largely generated. The shaking effect can be obtained. In FIG. 3 (b), the direction and magnitude of the force acting as the reduction effect are indicated by solid arrows.
The swing-down device 1 in which the height of the flow path in the liquid storage means 10 is fixed as shown in FIG. 2 or FIG. 3 can be easily applied to a relatively large structure 2. When applied to the structure 2, the external shape and the flow path shape of the liquid storage means 10, the liquid level of the liquid 20, the output of the circulation pump 31, and the like are designed in advance.

  For example, when the swing of the structure 2 is small, the adjustment of the rocking effect by the rocking device 1 may be performed by filling the liquid 20 in the liquid storage means 10 until it is nearly full (hc ≒ 0) to generate a swirling flow Control to generate a swirl flow at a low speed, or when the swing of the structure 2 is large, adjust the liquid level hw so that (hc + hw) / hw becomes more than 1 and not more than 1.6, Control is performed to generate high-speed swirling flow.

The liquid storage means may have an annular shape in plan view as a circular shape in plan view or a round shape in plan view other than an annular shape in a plan view as shown in FIG. 2 or FIG. 3. An annular shape, such as an annular shape, in which the direction of the fluid path changes gently can be selected.
FIG. 4 is a view showing the configuration of a vibration reduction device according to another embodiment of the present invention, which is provided with annular liquid storage means whose shape in plan view is a perfect circle. The same functional members as those of the embodiment described above are denoted by the corresponding reference numerals, and the description thereof is omitted.
The tips of the three injection tubes 133 are connected at equal intervals on the inner peripheral side of the liquid storage means 110 formed in a perfect circular ring shape, and the two suction pipes 132 are connected on the outer peripheral side. The tip of is connected 180 degrees apart. In FIG. 4, solid arrows indicate the flow direction of the circulating liquid 200, and dotted arrows indicate the flow direction of the swirling flow of the liquid 120 in the liquid storage unit 110.

Further, the liquid storage means may have a configuration in which the height of the flow path is variable, instead of the structure in which the height of the flow path is fixed as shown in FIG. 2 or 3.
FIG. 5 is a central cross-sectional view of the liquid storage means in the antiskid apparatus according to still another embodiment of the present invention. The same functional members as those of the embodiment described above are denoted by the corresponding reference numerals, and the description thereof is omitted. Further, in FIG. 5, the dotted arrow indicates the flow direction of the swirling flow generated in the liquid 220 stored in the liquid storage means 210.
A top plate 270 is provided in the liquid storage means 210 above the liquid level of the stored liquid 220. Since the top plate 270 is configured to be able to move and fix the inside of the liquid storage means 210 up and down by the raising and lowering means 280, the height of the space X is set even when the liquid level of the liquid 20 and the flow velocity of the swirling flow are changed. It becomes easy to adjust to the optimal height. Moreover, the dimension (width) in which the liquid 20 contacts the top plate 270 can be adjusted. As described above, the vibration reduction device 201 in which the height of the flow path in the liquid storage means 210 is variable is easier to adjust the reduction movement effect than the vibration reduction device in which the height of the flow path is fixed. It is easy to apply to the structure of
The elevating means 280 is constituted by any means such as a rack and pinion type, a winding type, a hydraulic type, and the like.
The liquid level of the liquid 220 stored in the liquid storage means 210 is the space X above the liquid level when the liquid storage means 210 is in a horizontal state and no swirling flow is generated in the liquid 220. Is adjusted to remain. As described above, the space X is a space that is generated above the liquid level, and is a space that does not substantially prevent the rise of the liquid level. Therefore, in the liquid storage unit 210 shown in FIG. 5, the space X is from the liquid surface to the top plate 270, not from the liquid surface to the upper surface 211 of the liquid storage unit 210.

A predetermined gap C is provided between the outer side surface 271 of the top plate 270 and the outer peripheral inner surface 213 of the liquid storage means 210. Further, a predetermined gap D is provided between the inner side surface 272 of the top plate 270 and the inner peripheral inner surface 214 of the liquid storage means 210.
If there is no gap between the side surface of the top plate 270 and the inner surface of the liquid storage means 210, and if the space from the liquid surface to the top plate 270 is small, when the swirling flow is generated, Is inhibited by the top plate 270, so that there is not a sufficient height difference between the outer circumference and the inner circumference.
However, if C and D are provided in the gap between the side surface of the top plate 270 and the inner surface of the liquid storage means 210 as in this embodiment, even if the distance from the liquid surface to the top plate 270 is small, Since the liquid 2 can run on the top surface of the top plate 270 through the gap C, the liquid 220 can have a sufficient height difference between the outer peripheral side and the inner peripheral side. In addition, since the liquid 220 which rides on the upper surface of the top plate 270 flows down from the top plate 270 through the clearance gap D, it can be returned to the flow of a rotational flow.
Here, since the contact area between the lower surface of the top plate 270 and the liquid 20 can be increased by narrowing the gap C as much as possible, assuming that the width of the flow path of the liquid storage means 210 is B, the width of the gap C is It is preferable to set it as 0.1 B or less, and it is more preferable to set it as 0.03 B or less.
On the other hand, the gap D is made wider than the gap C because the gap D plays a role of returning the liquid 220 which has run on the upper surface of the top plate 270 to the lower side than the top plate 270. The width of the gap D is preferably 0.4 B or less, more preferably 0.2 B or less.
In the case of using a hose or a tube instead of a tank as the liquid storage means 10, the external force is used to press the hose or the tube to deform the shape of the space and to contact the height and the upper surface of the space. It is also possible to change In this case, the amount of liquid 20 may be changed as needed.

The anti-swing device described with reference to FIGS. 1 to 5 can be mounted not only on ships but also on structures such as floating bodies floating in water. 6 and 7 show an example of mounting on another structure. In each of FIGS. 6A to 6C and FIGS. 7A and 7B, the upper part is a top view and the lower part is a side view.
In FIG. 6 (a), the structure is the work boat 302, and the anti-swing device 301 is provided with the liquid storage means 310 formed in an annular shape with a perfect circular shape in plan view inside the hull of the work boat 302. It is a figure which shows the example which was done. By arranging the liquid storage means 310 in the boat length direction and the boat width direction, it is possible to obtain a reduction effect at the same time with respect to shaking in two directions of rolling and pitching. Further, the liquid storage means 310 also serves as a ballast tank, and seawater can be used as the liquid 320 to be stored. If there is a mounting space on the deck of the work ship 302, an oval or oval annular reduction gear may be mounted.
FIG. 6 (b) shows a ship 402 whose structure is called a barge or barge, and provided with a liquid storage means 410 formed in an annular shape of a rounded square in plan view inside the hull of the ship 402. It is a figure which shows the example which mounted the apparatus 401. FIG. By arranging the liquid storage means 410 in the boat length direction and the boat width direction, it is possible to obtain a reduction effect at the same time with respect to shaking in two directions of roll and pitch. Further, the liquid storage means 410 also serves as a ballast tank, and seawater can be used as the liquid 420 to be stored. When there is a mounting space on the deck of the ship 402, an anti-swing device formed in an oval or oval shape may be mounted.
FIG. 6 (c) shows a ship 502 whose structure is called a barge or weir, and the liquid storage means 510 is formed in an annular annular shape having an elliptical shape in plan view on the bow deck and the stern deck of the ship 502. It is a figure which shows the example which mounts the anti-shake apparatus 501 provided. By setting the long axis direction of the liquid storage means 510 as the ship width direction, it is possible to obtain a reduction effect on rolling.
FIG. 7A shows a floating member 602 whose structure is called semi-submersible (semi-sub), and the liquid storage means 610 formed in an annular shape having a perfect circular shape in plan view inside and under the deck of the floating member 602 is shown. It is a figure which shows the example which mounts the anti-shake apparatus 601 provided. By arranging the liquid storage means 610 over the length direction and width direction of the floating body, it is possible to obtain a reduction effect at the same time with respect to shaking in two directions of rolling and pitching.
FIG. 7 (b) shows the offshore power generation apparatus 702 provided with a wind turbine, and the shape in plan view of the floating body provided under the support for supporting the blades of the offshore power generation apparatus 702 is a perfect circle. It is a figure which shows the example which mounts the anti-shake apparatus 701 provided with the liquid accommodating means 710 formed in annular shape. The left figure in FIG. 7 (b) is a semi-sub type, and the right figure is a spar type.
Although not shown in the drawings, the anti-swing device according to the present invention is also applicable to the case where the structure is a gondola, a lift or the like used in a ski resort or the like.

Next, verification results of the anti-sway effect by the anti-sway device will be described.
FIG. 8 is an external view of a model used for verification.
FIG. 8 (a) is a perspective view of a vibration reduction device 801 provided with liquid storage means 810 that simulates an annular tank. However, the upper side of the liquid storage means 810 is open. One suction pipe 832 and one injection pipe 833 are provided. The tip of the suction pipe 832 is connected to the bottom surface of the liquid storage means 810, and the injection pipe 833 is raised from the bottom surface of the liquid storage means 810 located 180 degrees away therefrom. An elbow pipe fitting is attached to the end of the injection pipe 833, and the injection port is directed in the same direction as the flow direction of the swirling flow. Further, a circulation pump 831 is provided at a central portion of the liquid storage means 810.
As shown in FIG. 8 (b), the vibration reduction device 801 is mounted on a vibration generating means 802 corresponding to a structure.
FIG. 8C is a perspective view showing a state in which the liquid 820 is stored in the liquid storage means 810. Above the liquid 820, a top plate 870 formed in a disk shape in accordance with the flow path shape is disposed.

FIG. 9 is a central cross-sectional view of the liquid storage means used for verification.
The cross section of the liquid storage means 810 is rectangular, and the top plate 870 disposed above the liquid surface of the liquid 820 and lower than the upper surface 811 of the liquid storage means 810 is moved up and down by elevating means (not shown). It can go up and down. By raising or lowering the top plate 870, the height hc of the space X can be adjusted. The height hc of the space X is the height from the liquid surface of the liquid 820 to the top plate 870.
In the verification, changes in the level and flow velocity of the liquid 820 stored in the liquid storage means 810, and the change in the damping ratio due to the difference in the flow channel cross-sectional shape were measured. The liquid 820 was tap water.

In the verification, the flow rate of the swirling flow generated in the liquid 820 is changed by setting the opening ratio of the suction port of the circulation pump 831 to 100% (# 0), 45% (# 1), and 30% (# 2). The attenuation ratio at each set liquid level (hw = 50 mm, 75 mm, 100 mm, 125 mm) was measured. The flow rate of the swirling flow is faster as the opening ratio of the suction port of the circulation pump 831 is larger.
At the time of measurement, the upper surface 811 of the liquid storage means 810 and the top plate 870 were not installed, and the upper side of the liquid 820 was open. FIG. 10 is a relationship diagram of the flow velocity and the damping ratio based on the measurement result. In FIG. 10, “△” indicates the result of liquid level hw = 50 mm, “○” indicates the result of liquid level hw = 75 mm, and “□” indicates the result of liquid level hw = 100 mm in FIG. In FIG. 10, "x" indicates the result of liquid level hw = 125 mm. The vertical axis is the damping ratio ζ, and the horizontal axis is the flow velocity (cm / s).
It is understood that the damping ratio ζ tends to increase as the flow velocity of the swirling flow rises at any liquid level hw.
Therefore, the anti-sway device of the present invention can obtain a greater anti-sway effect by increasing the flow velocity of the swirling flow generated in the liquid storage means.

Next, for the liquid level hw = 75 mm and 100 mm, the ratio hl / hw of the height hl from the bottom surface 812 to the top plate 870 to the liquid level hw is sequentially changed between 1.0 and 1.5 or less, The damping ratio was measured when the flow rate of the swirling flow was adjusted by changing the opening ratio of the suction port of the circulation pump 831 to 100% (# 0), 45% (# 1), and 30% (# 2).
FIG. 11 is a relationship diagram of the flow velocity and the damping ratio based on the measurement result. In FIG. 11, the vertical axis is the damping ratio ζ, and the horizontal axis is the ratio hl / hw of the height hl to the liquid level hw.
12 is a central cross-sectional view of the liquid storage means used for verification, and FIG. 12 (a) shows a state in which a swirling flow is not generated, and FIG. 12 (b) shows a state in which a swirling flow is generated. There is.

FIG. 11 (a) shows the result of liquid level hw = 75 mm, "●" shows the result when the aperture ratio is 100% (# 0), and "薄 filled with ink" has 45% aperture ratio ( The result in the case of # 1) is shown, and "the shaded ○" shows the result when the aperture ratio is 30% (# 2), and "○" shows the result when no flow occurs in the liquid 820. It shows.
FIG. 11 (b) shows the result for the liquid level hw = 100 mm, "■" shows the result when the aperture ratio is 100% (# 0), and the "inked with □" has 45% aperture ratio ( The result in the case of # 1) is shown, “hatched □” indicates the result when the aperture ratio is 30% (# 2), “□” indicates the result when no flow occurs in the liquid 820 It shows.
It can be seen from FIG. 11 that, even when the top plate 870 is provided above the liquid 820, the damping ratio 傾向 tends to be higher as the flow velocity of the swirling flow is faster. The damping ratio is high when the ratio hl / hw between the height hl from the bottom surface 812 to the top 870 and the level hw exceeds 1.0 and is 1.1 or less, and hl / hw is 1.2 or more. There was a tendency to decline when it became. From this, it can be seen that, when the distance between the top plate 870 and the liquid surface is large, the liquid 820 and the top plate 870 do not easily come in contact with each other even when the swirling flow is generated, and the reduction effect is weakened. Therefore, (hc + hw) / hw is preferably set to more than 1.0 and not more than 1.6 at which the damping effect can be obtained, more preferably set to more than 1.0 and less than 1.2, and 1.0 It is most preferable to set to over 1.1.
As described above, when the flow velocity of the swirling flow is high, by setting the height hc = hl−hw of the space X small, a good reduction effect can be obtained, but the value of the height hc of the space X is By setting the dimension (width b) in which the liquid surface raised by the swirling flow comes in contact with the top plate 870 of the liquid storage means 810 in a horizontal state within a predetermined range, it is possible to further enhance the reduction effect. The predetermined range of the width b is preferably 1⁄8 B or more and 1⁄2 B or less with respect to the width B of the flow path of the liquid storage unit 810.

  When the amount of the liquid 820 stored in the liquid storage unit 810 is small and the swirling flow is fast, the flow may be disturbed and the swirling flow may not be clean. When the flow is disturbed, self-excited vibration occurs, and the damped vibration does not converge or amplifies. In such a case, the distance between the top plate 870 and the liquid surface (height hc of the space X) is set small, and the swirling flow is always in contact with the top plate 870 even when the liquid storage unit 810 is horizontal. In this state, the rectification effect works to suppress self-oscillation.

  INDUSTRIAL APPLICABILITY The present invention can effectively reduce oscillations occurring in a structure such as a gondola or a lift such as a ship, a floating body, or an offshore wind power generator, and can contribute to safe navigation or improvement of the operation rate of the structure.

DESCRIPTION OF SYMBOLS 1 Anti-swing apparatus 2 Structure 10 Liquid storage means 11 Upper surface 12 Bottom surface 20 Liquid 30 Swirling flow generating means 40 Swirling flow control means 50 Liquid supply / recovery means 60 Swing detection means 270 Top plate 280 Lifting means X Space

Claims (16)

  The liquid storage means which is mounted on a structure and stores the liquid above the liquid leaving a space above it has an annular annular shape, a swirl flow generation means for generating a swirl flow in the liquid, and the swirl flow And a swing flow control means for controlling the generation means, wherein the swing flow is controlled by controlling the swing flow to reduce the swing of the structure.   The apparatus according to claim 1, wherein the swirling flow control means controls the velocity of the swirling flow.   The liquid supply and recovery means for supplying and recovering the liquid is provided, and the height of the space is adjusted by increasing and decreasing the amount of the liquid stored in the liquid storage means by the liquid supply and recovery means. The anti-sway apparatus using the swirling flow according to claim 1 or 2 characterized by   4. The apparatus according to claim 3, wherein said swirling flow generating means doubles as said liquid supply / recovery means.   The liquid storage means is provided with a top plate, and raising and lowering means for raising and lowering the top plate, and the height of the space is adjusted by raising and lowering of the top plate by the raising and lowering means. A swing control device using the swirling flow according to any one of the above.   Assuming that the height of the space is hc, and the height from the bottom surface of the liquid storage means to the liquid surface of the liquid is hw, (hc + hw) / hw is set to more than 1 and not more than 1.6. The anti-sway apparatus using the swirling flow according to any one of claims 1 to 5, characterized in that   2. The apparatus according to claim 1, further comprising: a swing detection unit configured to detect a swing of the structure, and controlling the swirling flow according to the magnitude of the swing of the structure detected by the swing detection unit. The anti-sway apparatus using the rotational flow of any one of Claim 6.   The said swirling flow control means controls the said swirling flow so that the dimension which the said swirling flow contacts the upper surface of the said liquid accommodating means, or the said top plate may become in a predetermined range. The anti-rocking apparatus using the rotational flow of any one of claim | item 7 paragraph.   The anti-sway apparatus using swirling flow according to any one of claims 1 to 8, wherein an outer portion of a bottom portion of the liquid storage means has a curved surface.   The said structure is a floating body floating on a ship or water, The anti-sway apparatus using the rotational flow of any one of the Claims 1-9 characterized by the above-mentioned.   By holding the liquid above the liquid with a space in the upper side of the liquid, the liquid containing means having an annular shape in plan view mounted on the structure is caused to generate a swirl flow in the liquid, and the swirl flow is controlled. And a swinging method using the swirling flow, which is characterized in that the swinging of the structure is reduced.   The method of claim 11, wherein the velocity of the swirling flow is controlled.   13. The method according to claim 11, wherein the height of the space is adjusted by increasing or decreasing the amount of the liquid stored in the liquid storage means.   The method according to any one of claims 11 to 13, wherein the height of the space is adjusted by raising and lowering a top plate provided in the liquid storage means.   Assuming that the height of the space is hc, and the height from the bottom surface of the liquid storage means to the liquid surface of the liquid is hw, (hc + hw) / hw is set to more than 1 and not more than 1.6. A method of reducing swing using swirling flow according to any one of claims 11 to 14, characterized in that   16. The swirling flow is controlled such that the dimension in which the swirling flow contacts the upper surface of the liquid storage means or the top plate is in a predetermined range. A swing reduction method using the swirling flow described in.