KR20170049740A - Apparatus and Method for reducing oscillation frequency of Tuned Liquid Column Damper - Google Patents

Abstract

According to an embodiment of the present invention, an apparatus for reducing an oscillation frequency of a tuned liquid column damper comprises: a tuned liquid column damper placed in an upper portion of a structure, and varying flow velocity of a liquid flowing therein in accordance with oscillation of the structure to reduce oscillation of the structure; an oscillation sensor measuring oscillation of the structure; a level sensor detecting the level of the liquid flowing in the tuned liquid column damper; and a control unit controlling an opening rate of a flow velocity variable orifice provided in the multidirectional tuned liquid column damper based on a measured value of the oscillation sensor and the level detection sensor.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a vibration damper,

The present invention relates to an apparatus and method for controlling vibration frequency damping of a tuning fluid main damper.

It is very important to minimize vibration due to waves and winds in fixed and floating offshore structures. Tuned Mass Damper (TMD), which reduces the vibration of structures by using force due to inertia force of mass, (Tunneled Liquid Column Damper) to reduce the vibration of the structure.

However, the TMD adjusts the stiffness of the spring to synchronize with the cycle of the structure, which requires additional additional equipment, high installation cost, and difficult maintenance.

TLCD, on the other hand, is easy to install and maintain because it adjusts the liquid level in the tank and synchronizes with the cycle of the structure.

However, the conventional TLCD has a problem that attenuation occurs only in a single direction.

That is, the conventional TLCD has a U-shaped cross-sectional shape. When the TLCD has a U-shaped cross-sectional shape as described above, there is a problem in that attenuation is performed only for a specific directional vibration.

On the other hand, due to the recent depletion of oil fields in the coastal area, orders for new fixed and floating offshore structures have been expanded to deep-sea areas, and the size and exposure of natural sources such as waves and winds have become more severe. Vibration regulations for floating ocean structures are becoming more stringent.

Therefore, in order to maintain the safety of the structure and to create a safe and comfortable working environment for the operator, it is strongly required to develop a high performance high efficiency dam to damp low frequency vibrations generated by natural vibration sources such as waves and winds.

Korean Patent Publication No. 10-2014-4938 (Publication date 2014.01.14.)

SUMMARY OF THE INVENTION It is an object of the present invention to provide an apparatus and method for controlling vibration frequency damping of a tuned liquid main damper capable of varying a flow velocity of a liquid flowing in the damper, .

According to an aspect of the present invention, there is provided an apparatus for controlling a vibration frequency attenuation of a tuning liquid main damper, the apparatus being located at an upper portion of a structure, varying a flow rate of a liquid flowing inside the structure, A tuning fluid main damper for damping the vibration of the tuning fluid; A vibration detection sensor for measuring vibration of the structure; A water level sensor for sensing the level of the liquid flowing in the synchronous solution main damper; And a controller for controlling an aperture ratio of the flow rate variable orifice provided in the multi-directional synchronizing liquid main damper based on the measured values of the vibration sensor and the water level sensor.

The vibration frequency damping control method of a tuning fluid main damper according to an embodiment of the present invention includes: measuring vibration of a structure in a vibration detection sensor; Analyzing a vibration direction, a vibration magnitude, and a vibration frequency band of the structure using the vibration measurement value of the structure in the vibration frequency analysis unit; Measuring the level of the liquid contained in the tuning solution main damper located on the structure at the level sensor; The attenuation vibration frequency of the tuning fluid main damper for attenuating the vibration of the structure and the flow rate of the liquid according to the vibration frequency of the main damper are calculated based on the measurement value measured by the water level sensor and the resultant value analyzed by the vibration frequency analysis section in the signal processing section ; Controlling the operation of the flow rate variable orifice by generating a control signal for controlling the opening ratio of the flow rate variable type orifice so that the liquid in the main fluid damper flows at a flow rate of the liquid calculated by the signal processing unit; And displaying to the user the opening operation of the flow rate variable orifice and the rate and rate of change of the flow rate of the liquid.

According to one embodiment of the present invention and another embodiment, there is an effect that the vibration of the structure can be attenuated by varying the flow velocity of the liquid flowing in the structure according to the vibration change of the structure.

1 is a block diagram showing a vibration frequency attenuation control apparatus of a tuning fluid main damper according to an embodiment of the present invention.
FIGS. 2 to 8 are illustrations showing alterable structures of the embodiment of the tuning liquid main damper proposed in the present invention. FIG.
FIG. 9 is a perspective view showing one embodiment of the flow rate variable orifice shown in FIG. 1; FIG.
10 is an exploded perspective view of Fig.
11 is a plan view of Fig.
12 and 13 are front views of Fig.
14 is a perspective view showing another embodiment of the flow rate variable orifice shown in Fig.
15 is an exploded perspective view of Fig.
Fig. 16 is a plan view of Fig. 14. Fig.
17 and 18 are front views of Fig.
19 is a flowchart illustrating a method of controlling the vibration frequency attenuation of the tuning fluid main damper according to an embodiment of the present invention.
20 to 22 are graphs showing vibration reduction performance evaluation of the synchronized liquid columnar damper shown in FIG. 1 in the direction of the excitation, FIG. 20 is a graph of vibration reduction performance evaluation when the excitation direction is 0 degrees, FIG. FIG. 22 is a graph showing a vibration reduction performance evaluation when the direction of excitation is 45 degrees; FIG.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings, in order that those skilled in the art can easily carry out the present invention. In the following detailed description of the preferred embodiments of the present invention, a detailed description of known functions and configurations incorporated herein will be omitted when it may make the subject matter of the present invention rather unclear. In the drawings, like reference numerals are used throughout the drawings.

In addition, in the entire specification, when a part is referred to as being 'connected' to another part, it may be referred to as 'indirectly connected' not only with 'directly connected' . Also, to "include" an element means that it may include other elements, rather than excluding other elements, unless specifically stated otherwise.

Hereinafter, an active precision damping control apparatus and method for optimizing the performance of a tuning fluid main damper according to an embodiment of the present invention will be described in detail with reference to the drawings.

1 is a block diagram showing a vibration frequency attenuation control apparatus of a tuning fluid main damper according to an embodiment of the present invention.

1, a vibration frequency damping control apparatus 1000 of a tuning liquid main damper according to an embodiment of the present invention includes a tuning fluid main damper 300, a vibration detection sensor M, a water level detection sensor P1 To P4, and a control unit 500.

The tuning fluid main damper 300 is located at an upper portion of the structure and functions to damp the vibration of the structure by changing the flow velocity of the liquid flowing in the damper 300 according to the vibration of the structure.

The tuning fluid main damper 300 comprises four vertical pipes 10 and four horizontal pipes 20 connecting between the vertical pipes 10 and each vertical pipe 10 and a horizontal pipe 10, So that the vertical pipe 10 and the horizontal pipe 20 share the liquid contained therein. Here, it is preferable that the lower end of the vertical pipe 10 is hermetically closed so as to be able to receive the liquid.

The tuning fluid main damper 300 receives liquid in a space formed in the vertical pipe 10 and the horizontal pipe 20 and causes the sloshing phenomenon to reduce the vibration. (300) is formed in a rectangular shape so that vibration can be controlled in many directions.

The vibration detection sensor M may measure a vibration of the structure, and the vibration detection sensor may be an acceleration sensor. The vibration sensor may be an inertial measurement unit (IMU), a 3D gyroscope, a 3D accelerometer, a 3D magnetometer, an image sensor (for example, a CCD (charged coupled device) / RTI > and / or other sensor devices.

The level sensors P1 to P4 sense the level of the liquid flowing in the main pipe damper.

The control unit 500 controls the opening ratio of the flow rate variable orifice 100 provided in the synchronous solution main damper 300 based on the measured values of the vibration detection sensor M and the level detection sensors P1 to P4 .

The control unit 500 may include a vibration frequency analysis unit 510, a signal processing unit 520, and a control signal generation unit 530.

The vibration frequency analyzer 510 performs a function of analyzing the vibration magnitude, vibration direction, and vibration frequency band of the structure sensed by the vibration sensing sensor M.

The signal processing unit 520 is connected to the tuning solution main damper (not shown) for attenuating the vibrations of the structure based on the measured values of the water level sensors P1 to P4 and the analyzed values of the vibration frequency analysis unit 510 300) and the flow velocity of the liquid.

The control signal generator 530 generates a control signal for controlling the aperture ratio of the flow velocity variable type orientalis 100 so that the liquid in the synchronous liquid main damper flows at the flow velocity of the liquid calculated by the signal processing unit 520 And controls the operation of the flow rate variable orifice 100.

The display unit 600 displays the operation of the flow rate variable orifice 100 and the rate and rate of change of the liquid flow rate to the user.

The display unit 600 may be implemented as various types of displays such as a liquid crystal display (LCD), an organic light emitting diode (OLED) display, and a plasma display panel (PDP). A driving circuit, a backlight unit, and the like, which may be implemented in the form of an a-si TFT, a low temperature poly silicon (LTPS) TFT, an OTFT (organic TFT), or the like may be also included in the display unit 150.

FIGS. 2 to 8 are diagrams illustrating exemplary embodiments of the tunable liquid main damper according to the present invention. FIG. 2 is a schematic view showing an embodiment of the present invention, in which eight horizontal pipes 20 and eight vertical pipes 10, (For example, a pipe flange) (not shown).

3 (a) is a cross-sectional view of the vertical pipe 10 and four horizontal pipes 20 connecting the vertical pipes 10, (B) is a structure including a horizontally diagonal reinforcing pipe (30) for connecting the horizontal pipe and the vertical pipe And further includes a horizontal diagonal reinforcing pipe 30 which is installed in a diagonal direction with respect to the horizontal pipe 20 to reinforce the structure.

4 (a) is a sectional view showing a state in which the vertical pipe 10 and the horizontal pipe 20 are arranged in a diagonal direction (vertical direction) in addition to the four vertical pipes 10 and the four horizontal pipes 20 connecting the vertical pipes 10, And a vertical diagonal reinforcing pipe 40 for reinforcing the structure by connecting the horizontal pipe and the vertical pipe to each other. (B) is a structure in which eight horizontal pipes and eight vertical pipes are interconnected (for example, a pipe flange) And a vertical diagonal reinforcing pipe 40 for reinforcing the structure by connecting the vertical pipe 10 and the horizontal pipe 20 in a diagonal direction to each other by using a structure .

5 (a) is a perspective view of the horizontal pipe 20, which is installed in a diagonal direction with respect to the horizontal pipe 20 in addition to the four vertical pipes 10 and four horizontal pipes 20 connecting the vertical pipes 10, (B) is a structure including a horizontal diagonal reinforcing pipe 30 and a vertical diagonal reinforcing pipe 40 installed in a diagonal direction with respect to the vertical pipe 10 to reinforce the structure. As shown in Fig.

6 may be a structure including a ring pipe 50 formed in a ring shape and a plurality of vertical pipes 10 spaced apart at regular intervals and installed vertically to the ring pipe 50.

7 shows a structure including a ring pipe 50 formed in a ring shape and a plurality of vertical pipes 10 spaced apart at regular intervals and vertically installed on the ring pipe 50, And a horizontal diagonal reinforcing pipe 30 installed in a diagonal direction to reinforce the structure.

8A shows a ring pipe 50 formed in a ring shape and a plurality of vertical pipes 10 spaced apart at regular intervals from each other and vertically installed in the ring pipe 50, A vertical diagonal reinforcing pipe 40 for reinforcing the structure by connecting the ring pipe 50 and the vertical pipe 10 in a diagonal direction to a structure including a horizontal diagonal reinforcing pipe 30 installed in a diagonal direction to reinforce the structure, (B) may be a structure comprising two layers of the structure of (a).

Fig. 9 is a perspective view showing one embodiment of the flow rate variable orifice shown in Fig. 1, Fig. 10 is an exploded perspective view of Fig. 9, Fig. 11 is a plan view of Fig. 9, and Figs. 12 and 13 are front views of Fig. .

Referring to FIGS. 9 to 13, the orifice device 100 may include a body 110 and an aperture ratio controller 120.

The body 110 forms an outer surface of the orifice 100 and may be installed inside the tuning fluid main damper 300. The body portion 110 may be installed at the center of the horizontal portion 312.

The body part 110 may include an opening 111 to allow the liquid filled in the main body damper 300, that is, the water receiving part 310, to flow to both sides.

The aperture ratio adjusting unit 120 adjusts the aperture ratio of the opening 111. The aperture ratio adjusting unit 120 includes at least one shaft 121 mounted on the body 110, an adjusting block 122 rotating around the shaft 121, And a rack gear 124 meshing with the pinion 123. The rack gear 124 may be a rod-shaped gear.

At this time, the shaft 121 may be installed to cross the opening 111, and a plurality of the shaft 121 may be provided in a row.

Meanwhile, the control block 122 may have a columnar shape having an elliptical cross section. In this way, the flow of the fluid can be made more smooth.

A plurality of the pinions 123 are provided at one ends of the plurality of shafts 121 and the rack gear 124 may be provided to be engaged with the plurality of pinions 123. As the rack gear 124 linearly reciprocates, the plurality of pinions 123 can be rotated at the same angle, so that the adjustment block 122 rotates together, 111 can be adjusted.

The opening ratio adjusting unit 120 may further include a driving unit (not shown) for providing a driving force to linearly reciprocate the rack gear 124.

At this time, there is no limitation on the structure and type of the driving unit (not shown), and various forms can be applied without limitation as long as the rack gear 124 can reciprocate linearly.

14 is a perspective view showing another embodiment of the flow rate variable orifice shown in Fig. 1, Fig. 15 is an exploded perspective view of Fig. 14, Fig. 16 is a plan view of Fig. 14, and Figs. 17 and 18 are front views of Fig. 14 .

Referring to FIGS. 14 to 18, the orifice 200 according to another embodiment of the present invention may include a body 210 and an aperture ratio controller 220.

The body 210 may include a pair of control block receiving portions 212 receiving the control blocks 222 on both sides of the opening 111. [

Meanwhile, the aperture ratio adjusting unit 220 may include a columnar adjusting block 222 having a fan-shaped cross section.

At this time, the pair of shafts 221 may be provided on both sides of the opening, and the control block 222 is received in the control block receiving portion 212 by rotating about the shaft 221 as a center axis, The aperture ratio of the opening 111 can be maximized.

The aperture ratio adjusting unit 220 includes a pair of pinions 223 provided at one ends of the pair of shafts 221 and a pair of rack gears 224 engaged with the pair of pinions . At this time, the pair of rack gears 224 may be integrally formed or joined together by a connecting member 225 to be able to behave integrally.

Accordingly, when the pair of rack gears 224 is linearly reciprocated, the control block 222 is received in the control block receiving portion 212 to minimize the opening ratio of the opening portion 111, The adjustment block 222 may block the opening so as to maximize the aperture ratio of the opening 111.

19 is a flowchart showing a method of controlling the vibration frequency attenuation of the tuning fluid main damper according to one embodiment of the present invention.

Referring to FIG. 19, a vibration frequency attenuation control method (S100) of a tuning liquid main damper according to an embodiment of the present invention measures vibration of a structure in a vibration sensor M (S110) The vibration frequency analyzer 510 analyzes the vibration direction, vibration size, and vibration frequency band of the structure using the vibration measurement values of the structure (S120).

Next, the water level sensors P1 to P4 provided in the tuning liquid main damper 300 located on the structure measure the level of the liquid contained in the tuning liquid main damper 300 (S130).

Thereafter, the signal processing unit 520 in the control unit 500 determines the vibration level of the structure based on the measurement values of the water level sensors P1 to P4 and the result of the analysis by the vibration frequency analysis unit 510 The attenuation vibration frequency of the synchronizing liquid main damper 300 and the flow rate of the liquid are calculated S140.

The control signal generator 530 in the control unit 500 controls the flow rate of the fluid in the main flow damper 100 so that the liquid in the main fluid damper 300 flows at the flow rate of the liquid calculated by the signal processing unit 520 A control signal for controlling the opening ratio is generated and the operation of the flow rate variable orifice 300 is controlled (S150).

Finally, the display unit 600 displays the opening operation of the flow rate variable orifice 300, the flow velocity change rate and the rate of change of the liquid to the user (S160).

20 to 22 are graphs showing vibration reduction performance evaluation of the synchronized liquid columnar damper shown in FIG. 1 according to the excitation direction. Table 1 below shows conditions for vibration reduction performance test by the excitation direction.

Excitation frequency [1Hz] Direction of excitation 0 degree Direction of 22.5 degrees Direction of rotation 45 degrees Empty TLCD 34.8 33.3 33.3 Filled TLCD 5.8 6.6 7.3 Vibration reduction rate 83.3% 80.2% 78.1%

FIG. 20 is a graph showing a vibration reduction performance evaluation when the direction of the excitation is 0 degrees, FIG. 21 is a graph showing the vibration reduction performance evaluation when the excitation direction is 22.5 degrees, and FIG. (TLCD), when the frequency 1 Hz applied to the structure is applied, the liquid contained in the pipe constituting the main liquid damper (TLCD) of the synchronizing liquid absorbs the vibration energy applied to the structure, It is confirmed that the vibration is reduced.

According to the vibration frequency damping control device of the tuning fluid main damper according to the embodiment of the present invention, the flow rate of the liquid flowing in the main damper of the tuning fluid varies according to the vibrations of the structure, Can be attenuated.

For reference, the control unit 500 disclosed in an embodiment of the present invention may be a computing device, and the computing device may include at least one processing unit and memory.

The processing unit may include a central processing unit (CPU), a graphics processing unit (GPU), a microprocessor, an application specific integrated circuit (ASIC), a field programmable gate array (FPGA) And may have a plurality of cores.

The memory may be a volatile memory (e.g., RAM, etc.), a non-volatile memory (e.g., ROM, flash memory, etc.), or a combination thereof.

The computing device may also include additional storage. Storage includes, but is not limited to, magnetic storage, optical storage, and the like.

The storage may store computer readable instructions for implementing one or more embodiments disclosed herein, and other computer readable instructions for implementing an operating device, application programs, and the like. The computer readable instructions stored in the storage may be loaded into memory for execution by the processing unit.

On the other hand, the computing device may include communication connection (s) that enable it to communicate with other devices (e.g., temperature measurement unit, zero calibration unit) through the network. Here, the communication connection (s) may include a modem, a network interface card (NIC), an integrated network interface, a radio frequency transmitter / receiver, an infrared port, a USB connection or other interface for connecting a computing device to another computing device . The communication connection (s) may also include wired connections or wireless connections.

Each component of the computing device described above may be connected by various interconnects (e.g., peripheral component interconnect (PCI), USB, firmware (IEEE 1394), optical bus architecture, etc.) As shown in FIG.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the present invention is not limited to the disclosed exemplary embodiments, but various changes and modifications may be made without departing from the scope of the present invention.

Therefore, the embodiments disclosed in the present invention are not intended to limit the technical spirit of the present invention, but are intended to illustrate and not limit the scope of the technical spirit of the present invention. The scope of protection of the present invention should be construed according to the claims, and all technical ideas which are within the scope of the same should be interpreted as being included in the scope of the present invention.

1000: Vibration damping control device of tuned liquid main damper
10: vertical pipe 20: horizontal pipe,
30: horizontal diagonal reinforcing pipe 40: vertical diagonal reinforcing pipe,
50: ring pipe 100: orifice device
110, 210: body portion 111: opening
120, 220: aperture ratio adjusting portion 121, 221: shaft
122, 222: adjusting block 123, 223: pinion
124, 224: rack gear 300: synchronizing solution main damper
P1 ~ P4: Level sensor M: Vibration sensor
500: control unit 510: vibration frequency analysis unit
520: Signal processor 530: Control signal generator
600:

Claims (11)

A tuning fluid main damper located at an upper portion of the structure and varying the flow velocity of the fluid flowing therein in accordance with the vibration of the structure to attenuate vibration of the structure;
A vibration detection sensor for measuring vibration of the structure;
A water level sensor for sensing the level of the liquid flowing in the synchronous solution main damper;
And a control unit for controlling an opening ratio of a flow rate variable orifice provided in the tuning fluid main damper based on the measured values of the vibration sensor and the water level sensor.
The method according to claim 1,
Wherein at least one of the tuning fluid main dampers is stacked in a height direction.
3. The method according to claim 1 or 2,
Wherein the tuning solution main damper comprises:
Four vertical pipes with the lower end sealed; And
And four horizontal pipes connecting the vertical pipes,
Wherein each of the vertical pipe and the horizontal pipe is connected to the vertical pipe so that the vertical pipe and the horizontal pipe share the liquid contained therein.
The method according to claim 1,
Wherein the tuning solution main damper comprises:
A ring pipe formed in a ring shape; And
And a plurality of vertical pipes vertically installed in the ring pipe,
Wherein the ring pipe and the vertical pipe share both the ring pipe and the vertical pipe so that the ring pipe and the vertical pipe share the liquid contained therein.
The method of claim 3,
Wherein the tuning solution main damper comprises:
A horizontal diagonal reinforcing pipe installed in a diagonal direction with respect to the horizontal pipe to reinforce the structure; And
And a vertical diagonal reinforcing pipe connecting the vertical pipe and the horizontal pipe in a diagonal direction to reinforce the structure,
And the horizontal diagonal reinforcing pipe is connected to the horizontal diagonal reinforcing pipe so that the horizontal diagonal reinforcing pipe shares the liquid contained therein,
Wherein the vertical diagonal reinforcing pipe opens all the portions to which the vertical pipe and the vertical diagonal reinforcing pipe are connected to allow the liquid contained in the vertical diagonal reinforcing pipe to share the vibration damping control.
5. The method of claim 4,
A horizontal diagonal reinforcing pipe installed in a diagonal direction with respect to the ring pipe to reinforce the structure;
A vertical diagonal reinforcing pipe for reinforcing the structure by connecting the ring pipe and the vertical pipe in a diagonal direction; , And further comprises at least one of < RTI ID = 0.0 >
The horizontal diagonal reinforcing pipe is connected to the ring pipe and the horizontal diagonal reinforcing pipe is connected to each other so that the horizontal diagonal reinforcing pipe shares the liquid contained therein,
A vertical diagonal reinforcing pipe connected to the vertical pipe and the vertical diagonal reinforcing pipe and a portion connecting the ring pipe and the vertical diagonal reinforcing pipe to each other to allow the vertical diagonal reinforcing pipe to share the liquid contained therein, Vibration frequency attenuation control device.
7. The method according to any one of claims 1 to 6,
The flow rate variable-
A body portion having an opening; And
And an opening ratio adjusting unit having at least one shaft mounted on the body and at least one adjusting block for rotating the shaft about a central axis to adjust an opening ratio of the opening,
Wherein the adjusting block is a columnar shape having an elliptical cross section, the shaft and the adjusting block are provided in a row, the opening ratio adjusting portion includes a plurality of pinions respectively provided at one ends of the plurality of shafts, A vibration frequency attenuation control device for a tuned liquid main damper including rack gears.
8. The method of claim 7,
The shaft includes:
A pair of openings are provided on both sides of the opening, and the control block is a columnar shape having a fan-
Wherein the body includes a pair of control block receptacles on both sides of which the control block is received.
8. The method of claim 7,
Wherein the opening ratio adjusting portion includes a pair of pinions respectively provided at one ends of the pair of shafts and a pair of rack gears engaged with the pair of pinions, Vibration damping control system of main damper.
10. The method of claim 9,
Further comprising a drive unit for linearly moving the rack gear.
Measuring the vibration of the structure in the vibration detection sensor;
Analyzing a vibration direction, a vibration magnitude, and a vibration frequency band of the structure using the vibration measurement value of the structure in the vibration frequency analysis unit;
Measuring the level of the liquid contained in the tuning solution main damper located on the structure at the level sensor;
The attenuation vibration frequency of the tuning fluid main damper for attenuating the vibration of the structure and the flow rate of the liquid according to the vibration frequency of the main damper are calculated based on the measurement value measured by the water level sensor and the resultant value analyzed by the vibration frequency analysis section in the signal processing section ;
Controlling the operation of the flow rate variable orifice by generating a control signal for controlling the opening ratio of the flow rate variable type orifice so that the liquid in the main fluid damper flows at a flow rate of the liquid calculated by the signal processing unit; And
And displaying to the user the opening operation of the flow rate variable orifice and the rate and rate of change of the flow rate of the liquid.

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