KR102156394B1 - Semi-active turned mass damper with eddy-current break and the method control the same - Google Patents

Abstract

Disclosed are a semi-active tuned mass attenuator and a control method thereof. Specifically, as a semi-active type tuning mass attenuator provided in a structure, the mass body 100; A rail portion 200 to which the mass body 100 is movably coupled to one side thereof; A conductor member 300 provided on the mass body 100 and extending along the length direction of the rail part 200; And a deceleration part 400 which is positioned to be spaced apart from the mass body 100 by a predetermined distance and into which the conductor member 300 is inserted, wherein the deceleration part 400 is provided with a magnet 440 therein. A first magnetic portion 410; A second magnetic force portion 420 having a magnet 440 disposed therein, and facing the first magnetic force portion 410; And an insertion groove 430 formed between the first magnetic portion 410 and the second magnetic portion 420, wherein the conductor member 300 is a semi-active tuning mass inserted into the insertion groove 430 Disclosed are an attenuator and a method for controlling the same.

Description

Semi-active turned mass damper with eddy-current break and the method control the same}

The present invention relates to a semi-active type tuned mass attenuator, and more specifically, by applying a eddy current brake that can be electrically controlled to the tuned mass attenuator to implement variable damping, it is possible to improve the vibration control performance of a building or structure. It relates to a semi-active type tuned mass attenuator.

Recently, earthquakes that occur frequently around the world, including Korea, have caused damage to people and properties, and accordingly, interest in seismic design of buildings and structures that are expected to be enormous in the event of an accident is increasing.

Seismic design means designing to withstand earthquakes to prevent the building from being collapsed by earthquakes. However, such a seismic design is a matter to be reflected in the initial construction of a building, and after the building has already been completed, there is a limit that the seismic strength can be improved only by auxiliary means such as reinforcement.

Therefore, a means for reducing the vibration of the building to some extent is required even after the building is completed.

In addition, buildings may vibrate not only by earthquakes but also by strong air flows such as typhoons accompanied by strong winds. In this case, if the building does not vibrate at all, the impact from external force becomes stronger, increasing the risk of damage to the building, and if the building vibrates too severely, there is a fear that the durability of the building is deteriorated.

Therefore, a means for limiting the vibration of the building to a certain extent, such as inside or on the roof of the building, but not deteriorating the durability is also required.

Due to the aforementioned necessity, buildings are generally equipped with tuned mass attenuators. The tuned mass attenuator reduces vibration by absorbing energy transmitted to the building from the outside for dynamic stability of the building.

Specifically, the tuned mass attenuator is a type of vibration control device. It absorbs and disperses the amount of vibration energy of the building by external force to reduce the magnitude of the vibration of the building, and It is provided to improve the seismic and wind resistance performance of the building by reducing the displacement and acceleration of the top floor.

Tuning mass dampers traditionally used in buildings are provided in the form of viscous damping devices or friction type contact brakes. The viscous damping device uses a viscous fluid to limit the movement of the mass body, and the contact brake improves the control efficiency by limiting the movement of the mass body by friction.

However, when the conventional tuning mass damper is actually constructed or used, excessive damping force may be generated due to unforeseen variables such as frictional force between the rail and the rail block, and torsion of the shaft, and the target control efficiency may not be obtained. Therefore, there is a problem that excessive time and manpower are put in the process of correcting this.

In addition, in the case of a friction-type damping device, the friction coefficient and the friction pattern are greatly changed by factors such as temperature, humidity, lubrication condition, and wear condition of the friction force, so the reliability of the friction force is very low.

Furthermore, in the case of an MR damper (Magnetorheological Fluid Damper) using the bonding force of MR fluid or an ER damper (Electro-rheological Fluid Damper) using the bonding force of polar fluid, it is very expensive, and there is a limitation that periodic replacement of the fluid is required.

In particular, the viscous damping device has a fatal limitation that it is impossible to change the damping force because the damping capacity is determined during the initial design. This is due to the fact that, unlike the tuned mass attenuators used in automobiles and railways, the tuned mass attenuators installed in buildings are very difficult to replace and maintain.

In addition to this, a passive damping device has been proposed, but the operator must manually operate it, and there is a limit to controlling it in an active or semi-active type.

Korean Laid-Open Patent Document No. 10-2017-0010143 discloses a variable mass dynamic damper that cancels vibration by additionally providing a variable mass unit and controlling it electrically.

However, since this type of device is premised to be applied to a vehicle, it is difficult to apply to a building with a much larger size, weight and external force than a vehicle, and the effect of vibration cancellation is reduced by using a relatively small additional mass. There is a limit to becoming.

Korean Patent Publication No. 10-2017-0102926 discloses an electromechanical actuator for reducing vibration by using an actuator capable of moving six degrees of freedom.

However, since this type of actuator is a type in which a standard mass is connected to and supported by a coil spring for movement of six degrees of freedom, there is a limit that it is difficult to apply to a heavy building because there is a limit to the increase of the mass of the standard mass.

Korean Patent Publication No. 10-2017-0010143 (2017.01.26.) Korean Patent Publication No. 10-2017-0102926 (2017.09.12.)

It is an object of the present invention to be installed in a structure such as a building or a structure, and by using an electrical method, the mass body moves actively in response to the vibration without the user manually manually manipulating the vibration of the structure. The objective is to provide a semi-active type tuned mass damper that can effectively counteract the vibration of a structure by manipulating it to respond to vibration.

In order to achieve the above object, the present invention, as a semi-active type tuned mass attenuator provided in a structure, the mass body (100); A rail portion 200 to which the mass body 100 is movably coupled to one side thereof; A conductor member 300 provided on the mass body 100 and extending along the length direction of the rail part 200; And a deceleration part 400 which is positioned to be spaced apart from the mass body 100 by a predetermined distance and into which the conductor member 300 is inserted, wherein the deceleration part 400 is provided with a magnet 440 therein. A first magnetic portion 410; A second magnetic force portion 420 having a magnet 440 disposed therein, and facing the first magnetic force portion 410; And an insertion groove 430 formed between the first magnetic portion 410 and the second magnetic portion 420, wherein the conductor member 300 is a semi-active tuning mass inserted into the insertion groove 430 Provide an attenuator.

Further, the magnet 440 provided inside the first magnetic portion 410 and the second magnetic portion 420 may be an electromagnet.

In addition, the intensity of the current applied to the magnet 440 may be adjusted.

In addition, a plurality of the reduction units 400 may be provided, and may be positioned on one side and the other side of the mass body 100 by a predetermined distance apart from the mass body 100.

In addition, the reduction units 400 may be provided at one side and the other side of the mass body 100 by a predetermined distance from the mass body 100 and have the same number, respectively.

In addition, an elastic member 500 may be provided on the one side 110 and the other side 120 of the mass body 100, respectively.

In addition, the present invention, as a control method of the quasi-active type tuned mass attenuator, (a) the sensor module 610 detecting the acceleration of the mass body (100); (b) calculating the velocity of the mass body 100 by integrating the detected acceleration by the integration module 620; (c) calculating the electromagnetic force according to the calculated speed by the electromagnetic force calculation module 630; (d) determining, by the magnetic flux density determination module 640, a magnetic flux density using the calculated electromagnetic force; (e) The current calculation module 650 provides a method for controlling a semi-active type tuning mass attenuator, including the step of calculating the magnitudes of the voltage and current to be applied according to the determined magnetic flux density.

In addition, step (b) may include (b1) filtering an error value of the calculated speed by the high pass filter unit (HPF) 622.

In addition, after the step (e), (f) applying a current to the reduction unit 400 according to the calculated voltage and current magnitude by the current application module 660 may be further included.

According to the present invention, an eddy current is formed by applying a current to a magnet provided in the deceleration unit, and the movement of the mass is controlled by the Lorentz force generated by inserting a conductor member connected to the mass into the resulting electromagnetic field. It is possible to effectively control the movement of the mass without a fluid for it.

In addition, since the damping capacity can be actively changed by controlling the magnitude of the Lorentz force by changing the current to be applied according to the required damping capacity in response to different vibrations, semi-active control is possible.

Furthermore, since it is possible to implement a semi-active tunable mass attenuator with only an electromagnet without a fluid for attenuation, cost and manpower can be reduced in maintenance.

1 is a perspective view showing a semi-active type tuned mass attenuator according to an embodiment of the present invention.
2 is a plan view of the semi-active type tuned mass attenuator of FIG. 1.
3 is a partially enlarged view of portion A of FIG. 2.
4 is a front view of the semi-active type tuning mass attenuator of FIG. 1.
5 is a side view of the semi-active type tuned mass attenuator of FIG. 1.
Fig. 6 is a diagram showing a conductor member of the semi-active type tuning mass damper of Fig. 1;
Fig. 7 is a partially cut-away perspective view showing a deceleration part of the semi-active type tuning mass damper of Fig. 1;
8 is a partially cut-away front view showing the deceleration portion of FIG. 7.
9 is a partially cut-away side view showing the deceleration portion of FIG. 7.
FIG. 10 is a block diagram showing a configuration for performing a method of controlling the semi-active type tuned mass damper of FIG. 1.
FIG. 11 is a conceptual diagram illustrating a process in which a semi-active tuned mass attenuator according to an embodiment of the present invention is controlled according to the method of FIG. 10.
FIG. 12 is a flowchart showing the configuration of the control method of FIG. 10 and the flow of information.
13 is a flowchart illustrating the control method of FIG. 10.
14 is a graph showing the results of the use of a tuning mass damper according to the prior art.
15 is a graph showing a simulation result according to the application of a semi-active tuned mass attenuator according to an embodiment of the present invention.
16 is another graph showing a simulation result according to application of a semi-active tuned mass attenuator according to an embodiment of the present invention.
17 is a graph showing displacement and acceleration of a semi-active type tuned mass attenuator according to an embodiment of the present invention according to various design variables.
18 is a graph showing a process of normalizing a result of applying a quasi-active tuned mass attenuator according to an embodiment of the present invention.

Hereinafter, with reference to the accompanying drawings, a semi-active type tuning mass attenuator and a control method thereof according to an embodiment of the present invention will be described in detail.

1. Definition of terms

The terms "front", "rear", "left", "right", "upper" and "lower" used in the following description will be understood with reference to the coordinate system shown in FIG.

The term "structure" used in the following description refers to all kinds of structures, such as buildings, buildings, temporary buildings, etc., in which people can perform life or work.

2. Description of the configuration of the semi-active type tuned mass damper

The semi-active tuned mass attenuator according to an embodiment of the present invention uses Lorentz force generated by electromagnetic force as a means for controlling the movement of the mass body 100.

1 to 5, the semi-active tuning mass damper according to an embodiment of the present invention includes a mass body 100, a rail part 200, a conductor member 300, a reduction part 400, and an elastic member 500. Includes.

The mass body 100 plays a role of canceling the vibration by moving to the left or right in response to the vibration generated by an external force applied to the structure. Specifically, the mass body 100 cancels the vibration generated in the structure by transmitting an inertial force to the structure.

The mass body 100 may be changed in size and mass according to the size, height, and mass of the structure. In the illustrated embodiment, the mass body 100 is provided in the shape of a cube, but the shape can be changed.

The mass body 100 includes a receiving portion (not shown) capable of accommodating an additional mass member (not shown) therein, and by adding an additional mass member (not shown) as necessary, the mass body 100 It may be provided as a structure capable of increasing the mass.

The mass body 100 is located on the rail part 200 to be described later, and is movable along the rail part 200 to be described later according to the vibration generated in the structure.

Two conductor members 300 to be described later are connected to the front side and rear side of the mass body 100, and elastic members 500 to be described later are connected to the left and right sides of the mass body 100.

The rail part 200 forms a path through which the mass body 100 can move. In the illustrated embodiment, the rail unit 200 is located under the mass body 100, so that the mass body 100 can move to the left or right along the rail unit 200 so that the movement of the mass body 100 is performed. Limit.

Alternatively, the rail part 200 may be located above the mass body 100 so that the mass body 100 may be connected to the rail part 200 by a separate hanger (not shown).

A wheel member (not shown) is provided at a portion where the rail part 200 and the mass body 100 contact each other, so that the mass body 100 can be smoothly moved.

In addition, a separate fastening member (not shown) is provided in the rail unit 200 to prevent any separation of the mass body 100, so that stable movement of the mass body 100 on the rail unit 200 may be ensured.

The conductor member 300 is coupled to the mass body 100, and when the mass body 100 moves to the left or right, Lorentz counters the movement of the mass body 100 as it moves within the electromagnetic field formed in the reduction unit 400 to be described later. It serves to control the movement of the mass body 100 by generating a force.

It is preferable that the conductor member 300 is formed of a material having high electrical conductivity. In one embodiment, the conductor member 300 may be formed of copper or aluminum.

The conductor member 300 is preferably formed to have a sufficient thickness to minimize electrical resistance and allow an induced current to flow freely.

Referring to FIG. 6, the conductor member 300 according to the illustrated embodiment includes a plate portion 310 and a protrusion portion 320.

The plate portion 310 plays a role of generating Lorentz force by moving within the reduction portion 400 to be described later in which an electromagnetic field is formed. That is, the plate portion 310 is inserted into the insertion groove 430 of the deceleration portion 400 to be described later so as to be movable in the left and right directions (see FIGS. 1 to 5 ).

The area of the plate portion 310 is preferably formed such that the Lorentz force generated by the movement of the plate portion 310 is large enough to control the movement of the mass body 100.

A detailed description of the process of controlling the movement of the mass body 100 according to the movement of the plate portion 310 will be described later.

The protrusion 320 is a portion protruding toward one side of the plate portion 310. A plurality of coupling holes 322 are formed in the protrusion 320 to provide a passage for coupling with the mass body 100.

A fastening means (not shown) such as a screw may be provided in the coupling hole 322 so that the conductor member 300 and the mass body 100 may be coupled.

In the illustrated embodiment, the conductor members 300 are provided as a total of four and are coupled to the front side and the rear side of the mass body 100, respectively, but the coupling positions and the number of them can be changed.

In addition, the plate portion 310 of the conductor member 300 is movably inserted into the insertion groove 430 of the reduction portion 400 to be described later by a predetermined area so as to immediately respond to the direction of vibration generated in the structure. It is preferably provided as.

The reduction unit 400 includes a first magnetic force unit 410 and a second magnetic force unit 420 provided with a magnet 440 therein, and a conductor member 300 that moves from the inside when power is applied. The Lorentz force is generated by the formation of an electromagnetic field.

In the illustrated embodiment, a total of four reduction units 400 are provided, and are positioned two by a predetermined distance from the left and right sides of the mass body 100, respectively. Although the position and number of the deceleration part 400 can be changed, it is preferable to be positioned at a position capable of generating Lorentz force by the movement of the conductor member 300 as described later.

7 to 9, the deceleration unit 400 includes a first magnetic force portion 410, a second magnetic force portion 420, an insertion groove 430, a magnet 440, and a frame 450.

The first magnetic portion 410 and the second magnetic portion 420 are positioned to face each other with an insertion groove 430 to be described later therebetween. That is, the first magnetic portion 410 and the second magnetic portion 420 are positioned to face each other based on the insertion groove 430 to be described later.

A magnet 440 to be described later is provided inside the first magnetic portion 410 and the second magnetic portion 420, and an electromagnetic field may be formed when current is applied. To this end, the first magnetic unit 410 and the second magnetic unit 420 may be electrically connected to separate power supply means (not shown).

The first magnetic portion 410 and the second magnetic portion 420 are formed of a material having high electrical conductivity so that the electromagnetic force generated by the magnet 440 provided inside can be transmitted to the insertion groove 430 to be described later. It is desirable to be.

The insertion groove 430 provides a space in which the conductor member 300 is inserted and moves inside the conductor member 300 to generate Lorentz force. It is preferable that the width of the insertion groove 430 is slightly larger than that of the conductor member 300 so that the conductor member 300 can move without being disturbed from the inside thereof.

In the illustrated embodiment, the insertion groove 430 is formed through the deceleration part 400 in the left-right direction, but may be formed in another shape that does not interfere with the movement of the conductor member 300.

A plurality of magnets 440 are located inside the first magnetic portion 410 and the second magnetic portion 420 to form an electromagnetic field for generating Lorentz force according to the movement of the conductor member 300.

The magnet 440 according to the embodiment of the present invention may be provided as an electromagnet, so that an electromagnetic field may be formed when a current is applied from a separate power supply means (not shown). Alternatively, the magnet 440 may be provided as a permanent magnet, but in this case, a separate method for maintenance must be devised.

In the illustrated embodiment, the magnet 440 is provided in a cylindrical shape, and in the first magnetic force portion 410 and the second magnetic force portion 420, three rows in the vertical direction, three in the left and right directions, four, and three in the order They are stacked and provided, but the shape and arrangement method may be changed.

However, the magnets 440 in the first magnetic portion 410 and the second magnetic portion 420 are provided in the same configuration and number, and are generated in the first magnetic portion 410 and the second magnetic portion 420. It is preferable that the movement of the conductor member 300 is not made unintentionally due to the difference in electromagnetic force.

The current or voltage applied to the magnet 440 may be adjusted. Accordingly, the strength of the electromagnetic field formed by the magnet 440 and the Lorentz force generated as the conductor member 300 moves within the electromagnetic field can be adjusted.

Accordingly, the damping force of the semi-active type tuned mass attenuator according to an embodiment of the present invention may be adjusted.

The frame 450 forms the outside of the deceleration part 400. Inside the frame 450, the above-described first magnetic portion 410, second magnetic portion 420, and insertion groove 430 are positioned.

When the mass body 100 starts to vibrate due to the vibration of the structure, the elastic member 500 adjusts the frequency of the mass body 100 and provides a restoring force that allows the mass body 100 moved to the left or right to move to the other side. to provide.

In the illustrated embodiment, the elastic member 500 is provided as a coil spring, but may be provided in any form capable of providing an elastic force or a restoring force to the mass body 100.

The frequency and period of the mass body 100 by the elastic member 500 may be determined by the following equation.

Here, m is the mass of the mass body 100 and k is the elastic modulus of the elastic member 500.

In the illustrated embodiment, the elastic member 500 extends to the left and right of the mass body 100 along the rail part 200 and is provided as two, and the connection method and number can be changed.

Referring to FIG. 10, the semi-active tuned mass attenuator according to an embodiment of the present invention further includes a control unit 600.

The control unit 600 senses information related to the movement of the mass body 100, uses this to calculate a current for generating a Lorentz force sufficient to control the movement of the mass body 100, and supplies it to the reduction unit 400. .

In an embodiment, the control unit 600 may be provided in a form capable of input/output and operation of information such as a microprocessor.

The control unit 600 includes a sensor module 610, an integration module 620, an electromagnetic force calculation module 630, a magnetic flux density determination module 640, a current calculation module 650, and a current application module 660.

The sensor module 610 detects the acceleration of the moving mass 100 in response to the vibration of the structure. The acceleration of the mass body 100 sensed by the sensor module 610 is transmitted to the integration module 620 to be described later and calculated as a velocity.

The integration module 620 integrates the acceleration sensed by the sensor module 610 over time and calculates it as a speed. At this time, since the movement of the mass unit 100 cannot always be guaranteed to be constant, noise may exist in the result of the integration.

The integration module 620 includes a high-pass filter unit 622 to filter the integration result value less than or equal to a specific value to improve the reliability of the speed of the integrated mass body 100.

The electromagnetic force calculation module 630 calculates an electromagnetic force for generating a Lorentz force sufficient to control the movement of the mass body 100 by using the velocity of the mass body 100 calculated by the integration module 620.

The magnetic flux density determination module 640 is required by using the electromagnetic force calculated by the electromagnetic force calculation module 630, the area of the plate portion 310 of the conductor member 300, and the magnet 440 of the reduction unit 400 Determine the magnetic flux density required to create a Lorentz force of magnitude.

The current calculation module 650 calculates the strength of the current and voltage that can generate the magnetic flux density determined by the magnetic flux density determination module 640 and the current application duration.

The current application module 660 applies a current to the reduction unit 400 according to the intensity and duration of the current calculated by the current calculation module 650. To this end, a power supply unit (not shown) that can be controlled by an electric signal from the current application module 660 may be provided.

3. Description of the control method of the semi-active type tuned mass damper

The semi-active tuning mass attenuator according to an embodiment of the present invention is installed in a structure to semi-actively attenuate the vibration of the structure through the above-described configurations.

Hereinafter, a method of controlling a semi-active tuned mass attenuator according to an embodiment of the present invention will be described in detail with reference to FIGS. 11 to 13.

When the structure in which the semi-active tuning mass attenuator according to an embodiment of the present invention is installed starts to vibrate by an external force, the mass body 100 starts to vibrate accordingly. The natural frequency of the mass body 100 may be calculated by the elastic member 500.

First, the sensor module 610 detects the acceleration of the mass body 100 (S100) and transmits it to the integration module 620.

The integration module 620 integrates the received acceleration of the mass body 100 and calculates it as the velocity of the mass body 100 (S200). In this process, information related to the natural frequency of the vibration of the mass body 100 may be considered.

In addition, as described above, in order to improve the reliability of the integrated speed, the high pass filter unit (HPF) 622 may filter the error value of the calculated speed (S210).

The electromagnetic force calculation module 630 calculates the required electromagnetic force using the calculated speed (S300).

In this case, the damping force for controlling the movement of the mass body 100 may be calculated by the following equation.

는 도체 부재(300)의 도전율(20

에서 Cu :

, Al :

),

는 진공 투자율

을 나타내며,

는 자석(440)의 세기

를 나타낸다.

는 자석(440)과 도체 부재(300) 사이의 거리,

는 도체 부재(300)의 두께를 나타내며,

은 도체 부재(300)와 자석(440)이 겹쳐지는 면적을 나타낸다. In the above formula

Is the conductivity of the conductor member 300 (20

From Cu:

, Al:

),

Is the vacuum permeability

Represents,

Is the strength of the magnet 440

Represents.

Is the distance between the magnet 440 and the conductor member 300,

Represents the thickness of the conductor member 300,

Represents an area where the conductor member 300 and the magnet 440 overlap.

The magnetic flux density determination module 640 determines the required magnetic flux density by using the calculated electromagnetic force, the area of the plate part 310 of the conductor member 300 and the information on the magnet 440 of the reduction part 400 (S400). .

The current calculation module 650 calculates the voltage to be applied, the magnitude of the current, and the application time according to the determined magnetic flux density (S500).

When the current application module 660 applies a current to the reduction unit 400 according to the calculated voltage, the magnitude of the current, and the application time (S600), an electromagnetic field is formed in the reduction unit 400 and is connected to the mass body 100. As the conductor member 300 moves, a Lorentz force is generated to control the movement of the mass body 100.

4. Description of the effect of the tuned mass attenuator according to the embodiment of the present invention

Hereinafter, the effect of the tuned mass attenuator according to an embodiment of the present invention will be described in detail with reference to FIGS. 14 to 18.

14 is a graph showing the transition of the damping force when a viscous damping device according to the prior art is used (a) and when a coulomb friction device is used (b).

Referring to FIG. 14A, when a viscous damping device is used, the damping force according to the moving speed of the mass changes linearly, and the maximum and minimum values of the damping force cannot be limited. Therefore, there is a limitation in that it is not possible to actively control the vibration of the structure and thus the movement of the mass.

Referring to FIG. 14B, when a Coulomb friction device is used, it can be seen that the damping force is always constant regardless of the speed of the mass. In other words, the damping force cannot be changed according to external conditions, and thus the vibration of the structure and the movement of the mass accordingly cannot be actively controlled.

15 shows a simulation result according to the use of a semi-active tuned mass attenuator according to an embodiment of the present invention. The illustrated simulation was performed using a hyperbolic tangent model as an example of a hyperbolic function, but the model for simulation is not necessarily limited to the corresponding function.

This simulation was performed using the hyperbolic tangent model as an example, when the behavior of the quasi-active tuned mass attenuator according to the embodiment of the present invention is continuous and differentiable over the entire speed section, it will play the role of a stable quasi-active tuned mass attenuator. Because you can expect to be able to.

Accordingly, when the mass body 100 moves at a high speed, an excessive damping force is not applied, and thus improved control efficiency can be obtained compared to the tuning mass damper according to the prior art.

Alternatively, the simulation according to the use of the quasi-active tuned mass attenuator according to an embodiment of the present invention may be performed using a Saturated Viscous model, an industrial Stribeck model, a Bingham model, and the like.

16 illustrates changes in the response of a structure according to various design variables when the semi-active tunable mass attenuator according to an embodiment of the present invention is applied using the above-described hyperbolic tangent model.

Even when using the quasi-active type tuned mass attenuator according to the embodiment of the present invention, it can be seen that a response similar to that of the conventional tuned mass attenuator occurs, which is the case of the semi-active type tuned mass attenuator according to the embodiment of the present invention. It means that it can be applied.

In particular, referring to the graphs indicated by thick broken lines (conditions c ₁ = 8, c ₂ = 10), it can be seen that a remarkably improved effect occurs in the frequency ratio range of 95% to 105% compared to the conventional tuned mass attenuator. I can.

17 illustrates displacement (a) and acceleration (b) when the semi-active tuning mass damper according to an embodiment of the present invention moves according to various design variables.

In particular, referring to FIG. 17A, the required stroke can be predicted through the displacement response of the semi-active tuned mass attenuator.

Referring to the graph (c2 = 10, c1 = 20 N) at the lowermost side, according to an embodiment of the present invention, when applying a semi-active tunable mass attenuator, in the frequency ratio section of 95% to 105%, the conventional It can be seen that the displacement and acceleration are significantly reduced compared to the tuned mass attenuator.

18 is a result of normalizing the damping force of the quasi-active tuning mass damper according to an embodiment of the present invention to the optimal damping force of the tuning mass damper according to the prior art for each optimal hyperbolic tangent model determined according to the damping ratio and mass ratio of the structure Is a graph showing.

It can be seen that each normalized result shows a certain pattern, especially a tendency to converge to a specific value. Based on this result, the following equation can be derived.

Since the semi-active tuning mass attenuator according to the embodiment of the present invention controls the movement of the mass body 100 by using the Lorentz force generated by the conductor member 300 moving inside the electromagnetic field generated by the magnet 422, Compared to a conventional tuning mass damper that controls the movement of a mass by friction between fluids or members, the efficiency and reliability of control are improved, and the durability period is increased, so that maintenance time, cost and manpower are reduced.

In addition, since the damping capacity can be variably changed according to the vibration of the structure in which the semi-active tuning mass damper is installed, it is possible to effectively attenuate the vibration of the structure.

Although the above has been described with reference to preferred embodiments of the present invention, those of ordinary skill in the art will variously modify and change the present invention without departing from the spirit and scope of the present invention described in the following claims. You will understand that you can.

100: mass
200: rail part
300: conductor member
310: plate
320: protrusion
322: coupling hole
400: reduction part
410: first magnetic field
420: second magnetic field
430: insertion groove
440: magnet
450: frame
500: elastic member
600: control unit
610: sensor module
620: integral module
622: high pass filter unit
630: electromagnetic force calculation module
640: magnetic flux density determination module
650: current calculation module
660: current application module

Claims (9)

As a semi-active type tuned mass attenuator provided in a structure,
Mass body 100;
A rail portion 200 to which the mass body 100 is movably coupled to one side thereof;
A conductor member 300 provided on the mass body 100 and extending along the length direction of the rail part 200; And
It is located spaced apart from the mass body 100 by a predetermined distance, and includes a deceleration part 400 into which the conductor member 300 is inserted,
The reduction unit 400,
As a pair of vertical frames 460 provided to face each other on the outermost side, consisting of first and second vertical frames 461 and 462, the plate shape extending along the length direction of the rail part 200 , Vertical frame 460;
A first magnetic force portion 410 fixed to the inside of the vertical frame 460 disposed to face each other, wherein a magnet 440 is provided on the first vertical frame 461;
A second magnetic force portion 420 fixed inside the second vertical frame 462 facing the first vertical frame 461 and having a magnet 440 on the second vertical frame 462; And
As an insertion groove 430 formed between the first magnetic portion 410 and the second magnetic portion 420, the magnet 440 and the second magnetic portion 420 provided in the first magnetic portion 410 ) Is a space formed between the magnets 440 provided in, and has a slit shape extending in the same direction as the length direction of the rail part 200, an insertion groove 430; Including,
The conductor member 300,
A conductor member 300 that attenuates the movement of the mass body 100 in a state inserted into the insertion groove 430, and has a plate shape extending in the same length direction as the rail part 200, and the first In the space formed between the magnet 440 provided in the vertical frame 461 and the magnet 440 provided in the second vertical frame 462, formed to move along the length direction of the rail part 200,
Semi-active tuned mass attenuator.
The method of claim 1,
The magnet 440 provided on the inside of the first magnetic portion 410 and the second magnetic portion 420 is an electromagnet,
Semi-active tuned mass attenuator.
The method of claim 2,
The intensity of the current applied to the magnet 440 can be adjusted,
Semi-active tuned mass attenuator.
The method of claim 1,
A plurality of the reduction units 400 are provided,
One side and the other side of the mass body 100 are positioned at a predetermined distance apart from the mass body 100, respectively,
Semi-active tuned mass attenuator.
The method of claim 4,
The reduction unit 400 is
One side and the other side of the mass body 100 are spaced apart from the mass body 100 by a predetermined distance and provided with the same number,
Semi-active tuned mass attenuator.
The method of claim 1,
The one side 110 and the other side 120 of the mass body 100 is provided with an elastic member 500, respectively,
Semi-active tuned mass attenuator.
As a control method of a semi-active type tuned mass attenuator, the semi-active type tuned mass attenuator,
As a semi-active type tuned mass attenuator provided in a structure,
Mass body 100;
A rail portion 200 to which the mass body 100 is movably coupled to one side thereof;
A conductor member 300 provided on the mass body 100 and extending along the length direction of the rail part 200; And
It is located spaced apart from the mass body 100 by a predetermined distance, and includes a deceleration part 400 into which the conductor member 300 is inserted,
The reduction unit 400,
A first magnetic force portion 410 provided with a magnet 440 therein;
A second magnetic force portion 420 having a magnet 440 disposed therein, and facing the first magnetic force portion 410; And
Includes an insertion groove 430 formed between the first magnetic portion 410 and the second magnetic portion 420,
The conductor member 300 is inserted into the insertion groove 430,
(a) sensing the acceleration of the mass body 100 by the sensor module 610;
(b) calculating the velocity of the mass body 100 by integrating the detected acceleration by the integration module 620;
(c) calculating the electromagnetic force according to the calculated speed by the electromagnetic force calculation module 630;
(d) determining, by the magnetic flux density determination module 640, a magnetic flux density using the calculated electromagnetic force;
(e) comprising the step of calculating, by the current calculation module 650, the magnitude of the voltage and current to be applied according to the determined magnetic flux density,
Control method of semi-active type tuned mass attenuator.
The method of claim 7,
The step (b),
(b1) filtering the calculated error value of the speed by the high pass filter unit (HPF) 622,
Control method of semi-active type tuned mass attenuator.
The method of claim 7,
After step (e),
(f) the current application module 660 further comprising the step of applying a current to the reduction unit 400 according to the calculated magnitude of the voltage and current,
Control method of semi-active type tuned mass attenuator.

Images