KR101799963B1 - Apparatus for reducing motion of structure and structure including the same - Google Patents

Abstract

An apparatus for reducing the sway of a structure according to an embodiment of the present invention includes a guide unit installed in a lateral direction or a longitudinal direction of a structure and including a curved track, And at least one mass that moves with the mass. According to the embodiment of the present invention, the fluctuation of the structure, particularly the rolling, can be quickly and effectively reduced while occupying a small space.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to an apparatus for reducing fluctuation of a structure,

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device for reducing fluctuations of a water / underwater structure or a land structure such as a ship, and a structure including the same.

Floating structures such as ships float on the water fluctuate as they are constantly exposed to large and small waves during sailing. Particularly, the water structure can be rotated by waves, such as rolling, pitching, and yawing. Of these, rolling refers to a rotational motion in which the ship swings to the left and right.

Various methods using bilge keels, fin stabilizers, gyroscopes and anti-rolling tanks have been used to reduce the rolling of the ship.

Bilge kills installed on all vessels can be installed relatively inexpensively, but there is a limit to reducing the rolling of the hull. The pin stabilizer is a device that uses the lift generated from the pin by installing pins on the outside of the hull, and it is effective only at a certain speed or more. In addition, there is a problem that installation cost and maintenance cost are increased due to the complicated structure. The gyroscope is a device that reduces the rolling by maintaining the position of the hull using the inertial force of the gyroscope. If the inertia force is increased, the performance is good, but the size is large and a large power and a lot of space are required.

The anti-rolling tank has a disadvantage that it occupies a lot of space by installing a tank on the right and left sides of the hull and connecting the pipes between the hull and the hull to reduce rolling by using the phase difference generated between the movement of the hull and the movement of water. In addition, since the effect of rolling reduction in the anti-rolling tank is not a left-right movement of the water but a vertical movement of the water, only an extremely limited portion of the tank is effective. In addition, even if the phase difference is used, there is a performance limit because the anti-rolling tank can not make the direction of movement of the hull and the direction of movement of water opposite.

Korean Utility Model Publication No. 20-2013-0007221

The present invention provides an apparatus capable of effectively reducing the fluctuation, particularly rolling, of a structure by causing it to move with a phase difference from the anti-rolling additional structure.

The present invention also provides an apparatus for rapidly reducing the fluctuation of a structure in response to fluctuations of the structure.

The present invention also provides an apparatus for effectively reducing the fluctuation of a structure while occupying a small space.

The present invention also provides an apparatus for maximizing the effect of reducing the vibration by dynamically adjusting the natural frequency of the anti-rolling weights based on the vibration frequency of the structure.

According to an embodiment of the present invention, there is provided an apparatus for constructing a structure, comprising: a guide unit installed in a lateral direction or a longitudinal direction of the structure and including a curved track; and at least one There is provided an apparatus for reducing the fluctuation of a structure including a mass of the mass body.

The mass may move at a natural frequency equal to or lower than a rocking characteristic frequency of the structure or a rocking frequency of the structure.

The curvature of the curved trajectory may be determined based on at least one of a fluctuation characteristic frequency of the structure, a fluctuation frequency of the structure, or a frequency of an external force received by the structure.

The guide portion may include a plurality of sub-guide portions coupled in bundles, and the mass may include a plurality of sub-masses moving along a curved orbit of each of the sub-guide portions.

Both ends of the curved trajectory may be parallel to the side wall of the structure.

A lubricant may be injected onto the curved trajectory.

The mass may be a metal material having a larger specific gravity than water (H ₂ O).

According to another embodiment of the present invention, there is provided a method of controlling a structure, comprising: a guide unit installed in a lateral direction or a longitudinal direction of the structure and including a curved track; a mass moving along the curved track in response to the fluctuation of the structure; And a control unit for adjusting a natural frequency of the mass body such that the mass body moves with a phase difference from the structure based on a vibration frequency of the structure received from the detection unit, do.

The control unit may adjust a natural frequency of the mass body to a target frequency that is equal to or lower than a vibration frequency of the structure.

The controller may adjust the natural frequency of the mass body by adjusting a curvature of the curved orbit.

The controller may further include a curvature adjusting unit capable of raising or lowering at least a part of the curved trajectory, and the controller may control the curvature adjusting unit to adjust the curvature of the curved trajectory.

The guide portion may be formed by combining a plurality of bendable steel materials.

The guide portion is formed to have a hollow circular cross-section by coupling the plurality of wire ropes in a twisted manner, and a material of a more flexible material than the wire rope can be attached to at least one of the outer surface or the inner surface of the guide portion.

The controller may adjust the natural frequency of the mass by adjusting at least one of an amount of the fluid in the guide portion and a flow of the fluid.

And a fluid control unit including a first valve controlling a fluid supply to the guide unit and a second valve controlling fluid discharge from the guide, wherein the control unit controls the first valve and the second valve So that the amount of the fluid in the guide portion can be adjusted.

And a fluid control unit including a pipe connecting both ends of the guide unit and a third valve installed in the pipe to control the flow of the fluid, and the control unit controls the third valve to control the fluid in the guide unit, Can be controlled.

The tube may be formed along the curved trajectory.

According to still another embodiment of the present invention, there is provided a portable electronic device including a main body and at least one pivotal reduction device installed in the main body, wherein the pivotal motion reduction device includes a guide installed in a lateral direction or a longitudinal direction of the main body, And at least one mass that moves along the curved trajectory in response to fluctuations of the main body.

The shaking of the main body may be at least one of rolling or pitching.

The sway reducing device may be installed in a cofferdam, a double-hull, or a double bottom of the main body.

According to the embodiment of the present invention, the fluctuation of the structure can be rapidly and effectively reduced since the moving is performed with a phase difference from the anti-rolling additional structure in response to the fluctuation of the structure.

In addition, according to the embodiment of the present invention, since the anti-rolling weight of the metal material having a specific gravity larger than that of water is used, the space occupied by the anti-rolling weight can be drastically reduced as compared with the conventional anti- If using double bottom, it can be installed without additional space.

Further, according to the embodiment of the present invention, it is possible to dynamically adjust the natural frequency of the anti-rolling spindle based on the vibration frequency of the structure, thereby maximizing the vibration reducing effect.

1 is a cross-sectional view showing a structure of an apparatus for reducing the fluctuation of a structure according to an embodiment of the present invention.
2 is a view showing another example of a guide unit and a mass of an apparatus for reducing the fluctuation of a structure according to an embodiment of the present invention.
3 is a view showing another example of a guide portion and a mass of an apparatus for reducing the fluctuation of a structure according to an embodiment of the present invention.
4 and 5 are views for explaining the principle of reducing the fluctuation of the structure by the motion of the mass body in the apparatus for reducing the fluctuation of the structure according to an embodiment of the present invention.
FIG. 6 is a graph showing a displacement transfer rate and a phase angle according to a frequency ratio of a natural frequency of a mass and a fluctuation frequency of a structure, with reference to FIG.
FIG. 7 is a graph showing the experimental result of the effect of the apparatus for reducing the sway of a structure according to an embodiment of the present invention.
8 is a diagram showing the configuration of an apparatus for reducing the fluctuation of a structure according to another embodiment of the present invention.
9 is a view showing an example of a guide part in an apparatus for reducing the fluctuation of a structure according to another embodiment of the present invention.
10 is a view showing a configuration of an apparatus for reducing the fluctuation of a structure according to another embodiment of the present invention.
11 is a view showing an example of a fluid control unit in an apparatus for reducing the fluctuation of a structure according to another embodiment of the present invention.

The present invention is capable of various modifications and various embodiments, and specific embodiments are illustrated and described in the drawings. It should be understood, however, that the invention is not intended to be limited to the particular embodiments, but includes all modifications, equivalents, and alternatives falling within the spirit and scope of the invention.

The terms including ordinal, such as second, first, etc., may be used to describe various elements, but the elements are not limited to these terms. The terms are used only for the purpose of distinguishing one component from another. For example, without departing from the scope of the present invention, the second component may be referred to as a first component, and similarly, the first component may also be referred to as a second component. And / or < / RTI > includes any combination of a plurality of related listed items or any of a plurality of related listed items.

It is to be understood that when an element is referred to as being "connected" or "connected" to another element, it may be directly connected or connected to the other element, . On the other hand, when an element is referred to as being "directly connected" or "directly connected" to another element, it should be understood that there are no other elements in between.

The terminology used in this application is used only to describe a specific embodiment and is not intended to limit the invention. The singular expressions include plural expressions unless the context clearly dictates otherwise. In the present application, the terms "comprises" or "having" and the like are used to specify that there is a feature, a number, a step, an operation, an element, a component or a combination thereof described in the specification, But do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, or combinations thereof.

Unless defined otherwise, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. Terms such as those defined in commonly used dictionaries are to be interpreted as having a meaning consistent with the contextual meaning of the related art and are to be interpreted as either ideal or overly formal in the sense of the present application Do not.

Hereinafter, embodiments will be described in detail with reference to the accompanying drawings, wherein like or corresponding elements are denoted by the same reference numerals, and redundant description thereof will be omitted.

1 is a cross-sectional view showing a structure of an apparatus for reducing the fluctuation of a structure according to an embodiment of the present invention.

Referring to FIG. 1, an apparatus for reducing the sway of a structure according to an embodiment of the present invention includes a guide unit 110, a mass body 120, and a support unit 130. In this specification, the mass 120 is used as a term encompassing any object having a mass capable of acting as an anti-rolling pendulum.

The structure 100 generally includes a water / underwater structure that can be shaken by a wave, such as a ship. However, the structure 100 is not limited to such a structure, and may include a land structure that may fluctuate due to an external force. In FIG. 1, the cross section of the structure 100 is shown as a rectangle for convenience of explanation, but this is only an example, and the present invention can be applied to various other types of structures. In addition, although the present invention focuses on reducing rolling among the vibrations occurring in the structure 100, it can be applied in the same manner to other rotational movements such as pitching (rotational motion in which the structure swings back and forth).

The guide portion 110 may be installed in the structure 100 in the lateral or longitudinal direction according to the fluctuation pattern to be reduced. For example, in order to reduce rolling of the structure 100, the guide portion 110 can be installed in the lateral direction of the structure, and when it is desired to reduce the pitch of the structure 100, Can be installed. As used herein, the terms "lateral" and "longitudinal" are not limited to physical and mathematically defined lateral and longitudinal directions but include ranges that can be judged in the lateral or longitudinal direction when viewed from a general viewpoint.

A curved orbit for guiding the movement of the mass body 120 may be provided in the guide portion 110. As shown in Fig. 1, the curved trajectory may be embodied as a hose-shaped passage. Curved trajectories may include various types of curved trajectories derived from circles, ellipses, parabolic lines, trajectories, polynomials, exponential functions, trigonometric functions, or a combination thereof.

The curvature of the curved orbit is an important factor determining the natural frequency of the mass body 120 based on at least one of the fluctuation characteristic frequency of the structure 100, the fluctuation frequency of the structure 100, or the frequency of the external force received by the structure 100 Can be determined. The "fluctuation natural frequency" of the structure 100 is a natural frequency of the structure 100 and is a fixed value for rolling, pitching, and heaving. The "fluctuation frequency" It may be equal to the frequency of external force. In the present specification, the fluctuation natural frequency may include a rolling natural frequency or a pitch natural frequency according to the fluctuation pattern of the structure 100, and the fluctuation frequency may include a rolling frequency or a pitch frequency.

When the structure 100 is shaken by an external force, the structure 100 fluctuates according to the frequency of the external force. At this time, when the frequency of the external force is equal to or close to the natural frequency of the structure 100, resonance occurs to increase the fluctuation, and when the resonance point moves away from the resonance, the fluctuation decreases. The relationship between the structure 100 and the vibration reducing apparatus can correspond to the relationship between the external force body and the vibrating body. Therefore, by determining the curvature of the curved orbit so that the natural frequency of the mass body 120 is equal to or slightly smaller than the resonance natural frequency of the structure 100, the mass body 120 is resonated with the fluctuating natural frequency of the structure 100 That is, the vibration of the mass body 120 is maximized and the phase of the structure 100 is 90 ° out of phase with the oscillation of the structure 100, so that the vibrations of the structure 100 can be minimized.

The curvature of the curved trajectory may be constant throughout the guide portion 110, but may increase from the central portion of the guide portion 110 to both end portions. Concrete contents related to the curvature of the curved trajectory will be described later with reference to Figs. 4 to 6. Fig.

Both ends of the guide portion 110 may be formed in parallel with the side wall of the structure 100. At this time, both end portions of the guide portion 110 may or may not contact the side wall of the structure 100 according to the curvature of the curved track or the shape of the structure 100. The mass body 120 can be prevented from exerting a vertical force on the side wall of the structure 100 even when the vibrations of the mass body 120 are increased by making the both end portions of the guide portion 100 be parallel to the side wall of the structure 100 have.

Lubricating fluid can be injected into the curved trajectory of the guide portion 110. The lubricant may include various materials capable of lubricating between the mass 120 and the curved orbit. The mass body 120 can smoothly move in a curved orbit by the lubricant, thereby canceling the wear of the mass body 120 and the curved orbit, and reducing the attenuation.

The mass body 120 moves along the curved trajectory of the guide portion 110 in response to fluctuations (e.g., rolling or pitching) of the structure 100. According to one embodiment of the present invention, it is possible to reduce the fluctuation of the structure 100 by moving the mass 120 in the same direction as the structure 100 in response to the rolling or pitching of the structure 100, have. Particularly, the mass body 120 may move in a direction opposite to the structure 100 according to the relationship between the natural frequency of the mass body 120 and the fluctuation frequency of the structure 100 (for example, the rolling frequency or the pitching frequency) You can move in the same direction, or move with a phase difference. That is, the motion direction and the amplitude of the mass body 120 can be determined according to the relationship between the natural frequency of the mass body 120 and the vibration frequency of the structure 100, which can make the vibration of the structure 100 more severe or weak It is possible. The relationship between the natural frequency of the mass body 120 and the fluctuation frequency of the structure 100 will be described later with reference to FIG. 4 to FIG.

The mass body 120 may be made of a metal material having a specific gravity larger than that of water (H ₂ O). For example, the mass body 120 may be made of a metal material such as mercury (Hg) having a specific gravity of about 13.6 times as much as the specific gravity of water or iron (Fe) having a specific gravity of about 7.9 times. The use of the mass body 120 of a metal material having a specific gravity larger than that of water can drastically reduce the space occupied by the conventional anti-rolling tank using water. For example, when iron (Fe) is used as the mass 120, the size can be reduced to about 1/8 of that of the anti-rolling tank, and the volume can be reduced to about 1/60.

As shown in FIG. 1, the mass body 120 is formed in a sphere shape and can perform a rolling movement on a curved orbit. However, the mass body 120 may be formed in an elliptical shape or various other shapes to perform a sliding movement on a curved orbit. Particularly, when the bottom surface of the mass body 120 is formed in a wide shape and the contact area with the curved track is increased, there is an advantage that the load of the mass body 120 applied to the curved orbit can be dispersed.

The size and weight of the mass body 120 may be appropriately determined according to the weight of the structure 100, the curvature of the curved orbit, the constituent material and shape of the mass body 120, and the like within a range capable of reducing fluctuation of the structure 100 have.

The support part 130 supports the curved track of the guide part 110. [ The support 130 can support a curved orbit through a variety of commonly known support structures. 1 shows a case where the support 130 supports a part of a curved orbit, the support 130 may be configured to support the entire curved orbit. The support portion 130 may have a separate structure and may be coupled to the guide portion 110. Alternatively, the support portion 130 may be integrally formed with the guide portion 110 from the beginning.

Meanwhile, a plurality of the vibration suppression apparatuses according to an embodiment of the present invention may be installed side by side, front-back, or up-and-down directions of the structure 100. In this case, the number and position where the vibration reducing apparatus is installed can be appropriately selected according to the fluctuation pattern of the structure 100 to be reduced and the size and shape of the structure 100. For example, if the structure 100 is a ship, the anti-shake device may be installed in a cofferdam, a double hull or a double bottom in the hull.

Further, although not shown in FIG. 1, the vibration reduction apparatus according to an embodiment of the present invention may further include a fixing unit (not shown) for fixing the mass body 120 to a central portion of the curved orbit. The fixing part can be implemented using a stopper or the like, and the mass body 120 can be securely fixed when the vibration reducing device is not used.

FIG. 2 is a view showing another example of a guide unit and a mass of an apparatus for reducing the fluctuation of a structure according to an embodiment of the present invention, and FIG. 3 is a view for reducing the fluctuation of the structure according to an embodiment of the present invention Fig. 5 is a view showing another example of a guide part and a mass body of the device for the present invention.

The sub guide portion 110a has a smaller cross sectional area than the guide portion 110 and the sub mass 120a has a smaller weight and volume than the mass body 120. [ Optionally, the sum of the weights of the plurality of sub-masses 120a may be equal to the weight of the single mass 120. [ The embodiments of the present invention shown in FIG. 2 and FIG. 3 will be described on the basis of these contents.

2, in an embodiment of the present invention, the guide unit 110 may be embodied as a plurality of sub guide units 110a coupled in a bundle, and the mass body 120 may include a plurality of sub guide units 110a, And a plurality of sub masses 120a that respectively move along curved orbit of each of the plurality of sub masses 110a. That is, the single guide portion 110 can be replaced with a plurality of sub guide portions 110a, and the single mass body 120 can be replaced with a plurality of sub masses 120a. 2, the sub guide portions 110a are coupled in a bundle having a circular cross section. However, the shape of the bundle to which the sub guide portions 110a are coupled varies depending on the shape of the structure 100, the installation space, and the like .

Generally, since the weight of the structure 100 such as a ship is considerable, the weight 120 used to reduce the buoyancy of the structure 100 is also considerable in weight. Therefore, when the single mass body 120 is replaced with a plurality of sub masses 120a with respect to the large-scale structure 100, there is an advantage that manufacturing, transportation, management, and other handling become easier.

3, the guide part 110 may be embodied as a single sub guide part 110a, and the mass body 120 may be formed as a single sub guide part 110a. And may be implemented with a plurality of sub-masses 120a that move together along a curved trajectory. When the plurality of sub masses 120a are configured to move along one curved trajectory, the effect of reducing the vibration can be somewhat reduced as compared with the case of FIG. 2, but there is an advantage that the installation space can be further reduced.

4 and 5 are views for explaining the principle of reducing the fluctuation of the structure by the motion of the mass body in the apparatus for reducing the fluctuation of the structure according to an embodiment of the present invention. FIG. 6 is a graph showing the displacement transfer rate and the phase angle according to the frequency ratio of the natural frequency of the mass and the fluctuation frequency of the structure with reference to FIG.

4 illustrates a case where the mass body 120 moves in a clockwise direction (that is, in the same direction) when the structure 100 rotates clockwise by fluctuation to reduce fluctuation. 4, Gp is the center of curvature where the mass body 120 moves, and R is the radius of curvature. It is general that M is different in position from Gp as a center of rotation of the structure 100. Mass body 120, the case of movement by θ ₂ in the clockwise direction around the M, if the distance between the mass body M and 120 l, mglsinθ by the motion of the mass body 120 ₂ (I.e., a moment for rotating the structure 100 in the counterclockwise direction) is generated, so that the buoyancy of the structure 100 can be reduced.

When the mass body 120 capable of freely rolling is placed on the upper surface of the structure 100, when the structure 100 is inclined, the mass body 120 moves in a direction in which the structure 100 inclines. However, in the case where the mass body 120 moving along the monotonous orbit is installed in the structure 100, the structure 100 and the mass body 120 are moved in accordance with the relationship between the fluctuation frequency of the structure 100 and the natural frequency of the mass body 120, And a phase angle of. In order for the mass body 120 to reduce the fluctuation of the structure 100, the mass body 100 must move in the same direction as the structure.

When the structure 100 rotates clockwise, it is common that the mass body 120 rotates counterclockwise. However, when the structure 100 vibrates, the mass body 120 moves with a phase angle corresponding to the frequency ratio as shown in FIG. The case where the phase angle is 0 ° in the case of moving in a common sense direction and the case where the phase angle is 180 ° in the case of moving in the opposite direction of the common sense direction. Accordingly, it is possible to reduce the fluctuation of the structure 100 by causing the mass body 120 to move in the same direction as the structure 100, that is, with a phase difference of 180 degrees.

However, in practice, it is more advantageous to reduce vibration when the mass body 120 moves with a phase difference of 90 degrees with respect to the vibration of the structure 100. [ 6, when the mass body 120 moves with a natural frequency equal to the vibration frequency of the structure 100 (that is, the frequency ratio is 1), the vibration of the mass body 120 becomes maximum and the phase angle at this time becomes 90 [deg.].

In this case, the motion of the structure 100 and the mass body 120 will be described as follows. When the structure 100 is about to rotate in the clockwise direction at the center, the mass body 120 may interfere with the clockwise rotation of the structure 100 in a state where the mass 100 is rotated in the clockwise direction as much as possible. The mass body 120 starts to rotate in the counterclockwise direction at the center while the structure 100 rotates in the clockwise direction as much as possible. When the structure 100 rotates counterclockwise and comes to the center again, The counterclockwise rotation of the structure 100 can be prevented as much as possible in the clockwise rotation. Also, in a state where the structure 100 is rotated in the counterclockwise direction as much as possible, the mass body 120 starts to rotate in the clockwise direction from the center, thereby preventing the clockwise rotation of the structure 100.

The mass 120 is moved in the opposite direction of the velocity of the structure 100 and the motion of the structure 100 is determined by the fact that the mass 120 is moved with a phase difference of 90 [ Can be seen as preemptively interfering with. As described above, according to one embodiment of the present invention, the mass body 120 moves with a phase difference of 90 ° with the structure 100, thereby maximizing the shaking reduction of the structure 100.

Meanwhile, referring to FIG. 5, the motion of the mass body 120 may correspond to the motion of the simplex. When the mass 120 having a mass m is subjected to a simple circular motion along a curved orbit having a radius R, the equation of motion for the origin O of the mass 120 can be expressed by Equation (1).

Here,? Represents the rotation angle.

If the mass body 120 freely oscillates at a small rotation angle, Equation 1 can be approximated as Equation 2 below.

Therefore, the intrinsic angular frequency? _N , the natural frequency f _n , and the natural frequency period T of the mass body 120 can be expressed by Equation (3) below.

In the embodiment of the present invention, when the mass body 120 is constructed so as to move along a curved orbit having a curvature of 1 / R, the mass body 120 does not hang on the string, but the motion of the mass body 120 is expressed by the same equation of motion . Referring to Equation (3), it can be seen that the natural frequency and the natural oscillation period of the mass body 120 change according to the radius of the curved orbit, that is, the curvature (1 / R).

In this mass 120,

The displacement transfer rate of the damping mass 120 can be expressed by Equation (4).

Where ₀ represents the amplitude of the mass 120 and? ₀ represents the amplitude of vibration of the structure 100 (e.g., the rolling amplitude), r represents the frequency ratio, and? Represents the damping ratio. That is, the displacement transfer rate can be expressed as a ratio of the amplitude of the mass body 120 to the amplitude of the vibration of the structure 100, and the displacement transfer rate according to the frequency ratio r (? /? _N ) is shown in FIG. When the structure 100 rotates in the counterclockwise direction, the mass body 120 rotates in the clockwise direction. Therefore, the structure 100 is positive in the counterclockwise direction and the mass body 120 is positive in the clockwise direction. .

Referring to FIG. 6, in the section where the vibration frequency of the structure 100 is lower than the natural frequency of the mass body 120, the phase angle is substantially 0 ° in the section where the frequency ratio is 0 to 0.7, As shown in Fig. That is, the mass body 120 may generate a moment in a direction to further rotate the structure 100, and thus the structure 100 may be more agitated. In addition, the amplitude ratio is considerably large even though the phase angle is not large even in the section where the frequency ratio is about 0.7 to 0.9, suggesting that the mass body 120 can increase the fluctuation of the structure 100 more. In the section where the frequency ratio is larger than 0.9 and smaller than 1.0, the phase angle increases as the damping ratio increases. However, when the damping ratio is small, the phase angle is still small.

When the frequency ratio is 1, the phase angle is almost 90 degrees regardless of the damping ratio, and the transmission rate is also very large, so that the fluctuation of the structure 100 can be reduced to the maximum. When the frequency ratio is larger than 1, the phase angle is not close to 0 DEG in any case, so that there is no need to further increase the fluctuation of the structure 100. [

Therefore, in order to suppress the movement of the structure 100 as much as possible, it is preferable to make the frequency ratio to 1, that is, to make the vibration frequency of the structure 100 coincide with the natural frequency of the mass body 120, If it is smaller than 1, the fluctuation of the structure 100 may be increased, so that it may be more preferable to make the frequency ratio slightly larger than 1. That is, it is preferable that the natural frequency of the mass body 100 is slightly lower than the vibration frequency of the structure 100. As described later, if the attenuation is increased by taking measures such as filling the fluid in the guide portion 100 or suppressing the flow of the fluid, even if the frequency ratio is smaller than 1, the phase angle is close to 90 DEG, There is no risk to increase. Therefore, in this case, the maximum effect may be obtained at a frequency ratio of 1.

One embodiment of the present invention determines the curvature of a curved orbit in which the natural frequency of the mass body 120 is equal to or slightly lower than the vibration frequency of the structure 100 so that the mass body 120 has a phase difference of 90 degrees with the structure 100 So that the vibration reduction of the structure 100 can be maximized. In this case, as described above, the curvature of the curved orbit can be determined based on at least one of the fluctuation characteristic frequency of the structure 100, the fluctuation frequency of the structure 100, or the frequency of the external force received by the structure 100.

FIG. 7 is a graph showing the experimental result of the effect of the apparatus for reducing the sway of a structure according to an embodiment of the present invention.

Fig. 7 shows a case where an anti-rolling tank is installed (with ART, indicated by a dot-dashed line) and an anti-rolling weight is installed (no ART, dotted line) (that is, the rolling angle) when the model line is inclined at 20 degrees with respect to the vertical axis (with ARP, indicated by the solid line). As shown in FIG. 7, in the absence of the anti-rolling device, it took 9.15 seconds to reduce the rolling to 1/4, 5.85 seconds when the anti-rolling tank was installed, and 4.35 seconds when the anti- It was possible to reduce the rolling speed most effectively and effectively.

As described above, according to the embodiment of the present invention, the mass can move with a phase difference with the structure along the curved orbit in response to the fluctuation of the structure, so that the fluctuation of the structure can be rapidly and effectively reduced.

FIG. 8 is a view showing a structure of an apparatus for reducing the fluctuation of a structure according to another embodiment of the present invention, and FIG. 9 is a schematic view of an apparatus for reducing the fluctuation of a structure according to another embodiment of the present invention. Fig.

Referring to FIG. 8, an apparatus for reducing the sway of a structure according to another embodiment of the present invention includes a guide unit 110, a mass body 120, a detection unit 210, a curvature adjustment unit 220, and a control unit 230 . The detection unit 210, the curvature adjustment unit 220, and the control unit 230 may be provided in the structure 100.

The detection unit 210 detects a vibration frequency (for example, a rolling frequency) of the structure 100 and outputs the detected vibration frequency to the control unit 230. The detection unit 210 may include various sensors capable of measuring the attitude of the structure 100, such as a tilt sensor, an acceleration sensor, a position sensor, and the like. And output it to the controller 230.

The curuliform adjustment unit 220 not only supports the curved trajectory of the guide unit 110, but also raises or lowers at least part of the curved trajectory. Although not specifically shown in FIG. 8, the curvature adjusting unit 220 may raise or lower the entire or part of the curved track or both ends through various elevating structures. The curvature adjusting unit 220 can change the curvature of the curved trajectory by using the power generated by the driving of the motor 221. [ The curvature adjusting unit 220 may be controlled by the control signal received from the controller 230, but may be configured to operate manually without the controller 230. [

The control unit 230 can adjust the curvature of the curved orbit by driving the motor 221 of the curvature adjusting unit 220 based on the fluctuation frequency of the structure 100 inputted from the detecting unit 210. [ That is, the control unit 230 can adjust the natural frequency of the mass body 120 by adjusting the curvature of the curved orbit. For example, the control unit 230 may raise both ends of the curved orbit to increase the natural frequency of the mass 120, and lower both ends of the curved orbit to reduce the natural frequency of the mass 120 .

In one embodiment of the present invention, the controller 230 may adjust the curvature of the curved orbit so that the mass 120 has a natural frequency equal to or lower than the vibration frequency of the structure 100. [ Specifically, the control unit 230 may adjust the natural frequency of the mass body 120 to a target frequency determined based on the fluctuation frequency of the structure 100. At this time, the target frequency may correspond to a frequency lower than the fluctuation frequency of the structure 100 by a predetermined value?. For example, when the vibration frequency of the structure 100 is f, the natural frequency of the mass body 120 can be adjusted to the target frequency f-a. Adjusting the target frequency to be slightly lower than the fluctuation frequency of the structure 100 is effective when the fluctuation frequency of the structure 100 is lowered (that is, when the frequency ratio falls to 1 or less) To prevent the phase difference between the motion and the oscillation of the structure 100 from falling below 90 °, rather deteriorating the fluctuation of the structure 100.

In this embodiment, since the curvature of the curved trajectory must be changed, it is preferable that the guide portion 10 is configured to be bendable. Therefore, the guide portion 110 can be formed in various ways by combining a plurality of bendable circular steels. At this time, the plurality of circular steels may be coupled in a direction parallel to the longitudinal direction of the guide portion 110, or may be coupled in an oblique direction. 9, a hollow guide 110 may be formed of a plurality of bundles of wire ropes 110b, and a flexible material 110c such as a film or plastic may be attached to the outer surface, the inner surface, So that the guide part 110 having good flexibility can be formed. In this case, the wire rope 110b can be twisted and twisted so that the end face of the guide portion 110 can be formed into a hollow circular shape. With this configuration, the flexibility of the guide portion 110 can be increased while maintaining the strength of a certain level or more.

FIG. 10 is a view showing a structure of an apparatus for reducing the fluctuation of a structure according to another embodiment of the present invention, and FIG. 11 is a schematic view showing an apparatus for reducing fluctuation of a structure according to another embodiment of the present invention, And Fig.

10, an apparatus for reducing the sway of a structure according to another embodiment of the present invention includes a guide unit 110, a mass body 120, a detection unit 210, a fluid control unit 310, and a control unit 230 ). The fluid regulation part 310 may be provided in the structure 100.

The fluid regulating part 310 may supply the fluid into the guide part 110 or may discharge the fluid supplied into the guide part 110. In this case, when the fluid is supplied into the guide part 110, the natural frequency of the mass body 120 can be reduced by acting as an element that hinders the movement of the mass body 120. When the fluid in the guide part 110 is discharged, 120 can be increased. In one embodiment, the fluid regulator 310 includes a fluid pump (not shown) for supplying fluid, a tube (not shown) for transporting the fluid supplied from the fluid pump, At least one supply valve 311 and at least one discharge valve 312 for controlling the discharge of fluid from the guide portion 110. The operation of the fluid regulator 310 may be controlled by a control signal received from the controller 230, but may be configured to operate manually without the controller 230.

11, the fluid regulating part 310 includes a tube 313 for connecting both ends of the guide part 110 and at least one opening / closing valve 313 provided in the tube 313 for controlling the flow of the fluid, Lt; RTI ID = 0.0 > 314 < / RTI > At this time, the installation form of the pipe 313 connecting the guide unit 110 can be variously selected depending on the installation space of the structure 100 and various other factors. For example, the tube 313 may be installed horizontally, or may be installed along the curved trajectory of the guide portion 110, as shown in FIG. If the opening / closing valve 314 is closed to obstruct the flow of the fluid, the natural frequency of the mass 120 can be reduced by acting as an element that hinders the movement of the mass body 120, If the flow is smooth, the natural frequency of the mass body 120 can be increased.

The control unit 230 drives the fluid regulating unit 310 based on the fluctuation frequency (for example, the rolling frequency) of the structure 100 input from the detecting unit 210, Can be controlled. That is, the control unit 230 can adjust the natural frequency of the mass body 120 by adjusting either or both of the amount of the fluid in the guide unit 110 and the flow of the fluid. The control unit 230 may supply the fluid into the guide unit 110 or interfere with the flow of the fluid in order to reduce the natural frequency of the mass body 120, ) Or to make the flow of fluid smooth.

The controller 230 may adjust at least one of the amount of fluid in the guide portion 110 or the flow of the fluid so that the mass 120 moves at a frequency lower than the vibrational frequency of the structure 100 have. Specifically, the control unit 230 may adjust the natural frequency of the mass body 120 to a target frequency determined based on the fluctuation frequency of the structure 100. As described above, the target frequency may correspond to a frequency lower than the fluctuation frequency of the structure 100 by a predetermined value?. For example, when the vibration frequency of the structure 100 is f, the natural frequency of the mass body 120 can be adjusted to the target frequency f-a.

Thus, according to the embodiments of the present invention shown in FIGS. 8 to 11, the natural frequency of the mass body 120 is dynamically adjusted in accordance with the fluctuation frequency of the structure 100 to be detected, The reduction effect can be further maximized.

In an embodiment of the present invention, the controller 230 may not be included. In this case, the natural frequency of the mass body 120 is set so that the curvature of the curved orbit is adjusted so that the natural frequency of the mass body 120 is matched to the expected minimum fluctuation natural frequency of the structure 100 (the fluctuation characteristic frequency of the structure may vary, Can be designed. If an external force of the same frequency as that of the vibration characteristic of the structure 100 is applied, the vibration of the structure 100 is maximized. However, if an external force of a frequency far from the vibration characteristic frequency of the structure 100 acts, The agitation does not happen much. Thus, focusing on the natural oscillation fluctuation of the structure 100, the natural frequency of the mass 120 can be matched to the expected minimum fluctuation natural frequency of the structure 100.

It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit and scope of the invention as defined in the following claims. It will be understood.

100: Structure
110: guide portion
110a:
110b: Wire rope
120: mass
120a: Sub mass
130: Support
210:
220: Curvature adjuster
221: Motor
230:
310:
311: Supply valve
312: discharge valve
313: opening / closing valve

Claims (20)

An apparatus for reducing fluctuation of a structure,
A guide portion installed in a lateral direction or a longitudinal direction of the structure and including a curved track and having a hollow cross section;
At least one mass body moving in phase with the structure along the curved track in response to fluctuations of the structure; And
And a fluid regulating portion for supplying liquid into the guide portion or discharging the liquid in the guide portion, wherein the liquid supplied in the guide portion affects the motion of the mass body. The method according to claim 1,
Wherein the mass moves at a natural frequency equal to or lower than a rocking natural frequency of the structure or a rocking frequency of the structure. The method according to claim 1,
Wherein the curvature of the curved trajectory is determined based on at least one of a fluctuation characteristic frequency of the structure, a fluctuation frequency of the structure, or a frequency of an external force received by the structure. The method according to claim 1,
Wherein the guide portion includes a plurality of sub guide portions bundled together,
Wherein the mass includes a plurality of sub-masses moving along a curved trajectory of each of the sub-guide portions. The method according to claim 1,
Wherein both ends of the curved trajectory are parallel to the side walls of the structure. The method according to claim 1,
And a device for reducing the fluctuation of the structure into which the lubricant is injected on the curved orbit. The method according to claim 1,
Wherein the mass is a metal material having a specific gravity larger than that of water (H ₂ O). An apparatus for reducing fluctuation of a structure,
A guide installed in a lateral or longitudinal direction of the structure and including a curved track;
A mass that moves along the curved orbit in response to fluctuations of the structure;
A detector for detecting a vibration frequency of the structure; And
And a control unit for adjusting a natural frequency of the mass body by adjusting a curvature of the curved orbit based on a fluctuation frequency of the structure received from the detection unit so that the mass body moves with a phase difference with the structure,
The guide portion is formed to have a hollow circular cross-section by engaging a plurality of wire ropes in a twisted manner so as to reduce the fluctuation of a structure in which a material of a more flexible material than the wire rope is attached to at least one of the outer surface or the inner surface of the guide portion / RTI > 9. The method of claim 8,
Wherein the control unit adjusts the natural frequency of the mass to a target frequency equal to or lower than a fluctuation frequency of the structure. delete 9. The method of claim 8,
Further comprising a curvature adjusting unit capable of raising or lowering at least a part of the curved trajectory,
Wherein the controller controls the curvature adjuster to adjust the curvature of the curved track. delete delete An apparatus for reducing fluctuation of a structure,
A guide installed in a lateral or longitudinal direction of the structure and including a curved track;
A mass that moves along the curved orbit in response to fluctuations of the structure;
A detector for detecting a vibration frequency of the structure; And
And a control unit for adjusting a natural frequency of the mass based on a fluctuation frequency of the structure received from the detecting unit such that the mass moves with a phase difference with the structure,
Wherein the control unit adjusts at least one of an amount of liquid in the guide unit and a flow of the liquid to affect the motion of the mass, thereby adjusting the natural frequency of the mass. 15. The method of claim 14,
Further comprising a fluid regulating portion including a first valve controlling a fluid supply to the guide portion and a second valve controlling fluid discharge from the guide portion,
Wherein the control unit controls the first valve and the second valve to adjust the amount of fluid in the guide unit. 15. The method of claim 14,
Further comprising a fluid control unit including a pipe connecting both ends of the guide unit and a third valve installed in the pipe to control the flow of the fluid,
Wherein the control unit controls the third valve to control the flow of fluid in the guide unit. 17. The method of claim 16,
Wherein the tube is formed along the curved trajectory. As a structure,
main body; And
And at least one anti-shake device installed in the main body,
The above-
A guide portion provided in the lateral or longitudinal direction of the main body and including a curved track and having a hollow cross section,
At least one mass that moves along the curved trajectory in response to fluctuations of the body, and
And a fluid regulating portion for supplying the liquid into the guide portion or discharging the liquid in the guide portion, wherein the liquid supplied into the guide portion affects the motion of the mass. 19. The method of claim 18,
Wherein the oscillation of the body is at least one of rolling or pitching. 19. The method of claim 18,
Wherein the vibration reduction device is installed in a cofferdam, a double hull, or a double bottom of the main body.

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