JP2001279953A - Damping device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make compact of a damping device in the damping device making use of a hydraulic cylinder and to effectively control the vibration of a structure. SOLUTION: The damping device is constituted of a movable manhole provided so as to make it possible to make displacement to the structure 9, the hydraulic cylinder 3 moving the movable manhole 2, a hydraulic pump 4 driven by an electric motor 8 and first and second passages 21 and 22 for constituting a closed circuit connecting the hydraulic pump 4 and hydraulic cylinder 3, and it is so constituted that a discharge direction of the hydraulic pump 4 is changed over in accordance with the vibration of the structure 9.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement in a vibration damping device for suppressing a structure such as a building from shaking due to an earthquake or a strong wind.

[0002]

2. Description of the Related Art Conventionally, as a vibration control device of this kind, a vibration control device disclosed in Japanese Patent Publication No. 14513/1990 is provided with a movable mass provided displaceably with respect to a structure and a nut on the movable mass side. A ball screw and a motor for rotating and driving the ball screw are provided, and the movement of the movable mass is controlled to suppress the swing of the structure.

However, it is difficult to sufficiently secure the durability and impact resistance of the ball screw because of the structure in which the inertia force of the heavy movable mass is received in point contact with the ball.

[0004] Further, as disclosed in Japanese Utility Model Registration No. 2519112, as shown in FIG. 5, a hydraulic cylinder 3 for moving a movable mass 2 is provided, and a control unit 54 controls the hydraulic cylinder 3 via a servo valve 53. The hydraulic cylinder 3 is expanded and contracted by supplying pressurized hydraulic oil to the movable mass 2 to reciprocate. At this time, the swing of the structure is canceled by the reaction force acting on the movable mass 2.

[0005]

However, in such a conventional vibration damping device, since the flow of hydraulic oil is controlled by the spool of the servo valve 53 in order to extend and retract the hydraulic cylinder 3, energy is reduced. There was a problem that efficiency was low. Further, a pipe or the like for connecting the servo valve 53 to the hydraulic power source 51 is required, and there is a problem that the size and cost of the apparatus are increased.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and has as its object to reduce the size of a vibration control device using a hydraulic cylinder and to effectively suppress the vibration of a structure.

[0007]

According to a first aspect of the present invention, there is provided a movable mass provided displaceably with respect to a structure, a hydraulic cylinder for moving the movable mass, a hydraulic pump driven by an electric motor, and a hydraulic pump. A first and a second passage forming a closed circuit connecting the hydraulic cylinders are provided, and the discharge direction of the hydraulic pump is switched according to the swing of the structure.

A second invention is characterized in that, in the first invention, a hydraulic pump is connected to a hydraulic cylinder, and an electric motor, a hydraulic pump, a hydraulic cylinder, and first and second passages are unitized. .

According to a third invention, in the first or second invention, a spring for urging the movable mass to a predetermined position, a communication path bypassing the hydraulic pump and connecting the first and second paths, and a communication path And a communication path opening / closing means for opening / closing the communication path.

According to a fourth aspect of the present invention, in the third aspect, a normally-open electromagnetic shut-off valve is provided as the communication path opening / closing means, which shuts off the communication path when energized and opens the communication path when not energized. To do.

According to a fifth aspect of the present invention, in the third or fourth aspect, a relief valve for releasing fluid pressure from one of the first and second passages to the other, and a relief valve and a hydraulic pump for the first and second passages are provided. And a pump opening / closing means for opening and closing between them.

According to a sixth aspect of the present invention, in the fifth aspect, a normally closed electromagnetic shut-off valve for shutting off the first and second passages when power is not supplied is provided as the pump opening / closing means.

[0013]

According to the first aspect, the discharge direction of the hydraulic pump is switched according to the swing of the structure, whereby the direction of expansion and contraction of the hydraulic cylinder is switched, and the movable mass reciprocates. Thus, the vibration damping device functions as an active mass damper that suppresses the swing of the structure due to the reaction force of the movable mass.

Since the hydraulic cylinder is operated by expanding and contracting the hydraulic cylinder by switching the discharge direction of the hydraulic pump, there is no need for a servo valve for switching the flow of hydraulic oil and its hydraulic pressure source, etc., thereby achieving high energy efficiency and simplifying the structure. To be peeled off.

According to the second aspect of the present invention, since the electric motor, the hydraulic pump, the hydraulic cylinder, and the first and second passages are provided as a unit, no hydraulic piping or the like is required, and the apparatus can be made compact.

According to the third aspect, when the hydraulic cylinder functions as a passive mass damper, the communication passage is opened through the communication passage opening / closing means, and the movable mass opposes the spring as the structure shakes. Make the hydraulic cylinder expand and contract. The throttle means imparts damping resistance to the hydraulic oil flowing through the communication passage as the hydraulic cylinder expands and contracts, thereby absorbing vibration energy and suppressing the swing of the structure.

According to the fourth aspect of the invention, when the power is cut off, the communication passage is opened by stopping the energization of the normally-open electromagnetic shut-off valve, and the hydraulic cylinder functions as a passive mass damper without locking its movement. In addition, the vibration of the structure is suppressed.

According to the fifth aspect, when the hydraulic cylinder functions as a passive mass damper, the pump opening / closing means cuts off communication between the first and second passages to the hydraulic pump, and hydraulic oil does not flow to the hydraulic pump side. In this way, the entire amount of hydraulic oil flowing with the expansion and contraction of the hydraulic cylinder is guided to the throttle means through the communication passage. As a result, the desired damping resistance is provided via the throttle means, and the vibration of the structure is suppressed.

The pump opening / closing means opens and closes the first and second passages between the relief valve and the hydraulic pump, so that the relief valve works in any case where the pump opening / closing means opens and closes.
Excessive increase in pressure in the first and second passages is avoided.

According to the sixth aspect of the invention, the power supply to the normally closed electromagnetic shut-off valve is stopped at the time of a power failure, whereby the communication between the first and second passages to the hydraulic pump is cut off, and the hydraulic cylinder functions as a passive mass damper. And the shaking of the structure is suppressed.

[0021]

Embodiments of the present invention will be described below with reference to the accompanying drawings.

As shown in FIG. 1, structures 9 such as high-rise buildings
Is provided with a vibration damping device 1 that suppresses shaking due to an earthquake or strong wind. The vibration damping device 1 includes a movable mass (weight) 2 installed on the upper floor of a structure 9 and a hydraulic cylinder 3 that expands and contracts with the displacement of the movable mass 2. The movable mass 2 is displaceably supported via a plurality of rollers 5, while the main body of the hydraulic cylinder 3 is fixed to a structure 9, and a piston rod 35 extending from the hydraulic cylinder 3 is connected to the movable mass 2.

As shown in FIG. 2, the vibration damping device includes a hydraulic cylinder 3, an electric hydraulic pump 4, various valves for controlling the flow of hydraulic oil, and a power package 10 in which hydraulic circuits and the like connecting these units are unitized. The hydraulic piping for the package 10 is not required.

On the side of the cylinder 33 of the hydraulic cylinder 3, a damper block 60, an electromagnetic valve block 50 and a pump block 40 are provided side by side, and these are fastened to the cylinder 33 via a plurality of bolts 45. The hydraulic pump 4 is housed in the pump block 40. The electric motor 8 is fastened to one end of the pump block 40 via a plurality of bolts 46, and the tank 20 is fastened to the other end of the pump block 40 via a plurality of bolts 47. Pump block 40
Extends in parallel with the cylinder 33 together with the electric motor 8 and the tank 20, so that the power package 10 is downsized.

FIG. 3 shows a hydraulic circuit of the power package 10. The first and second passages 21 and 22 are
A closed circuit connecting the hydraulic cylinder 3 and the hydraulic cylinder 3 is formed. By switching the rotation direction (discharge direction) of the hydraulic pump 4 driven by the electric motor 8, the expansion / contraction operation direction of the hydraulic cylinder 3 is switched.

When the hydraulic cylinder 3 and the movable mass 2 function as an active mass damper, the swing of the structure 9 is detected through a sensor (not shown), and the control unit detects the direction of rotation of the electric motor 8 according to the swing of the structure 9. And the rotation speed is controlled to move the movable mass 2 so as to suppress the swing of the structure 9.

The fixed displacement hydraulic pump 4 is connected to the first and second passages 2.
A pair of ports to which the first and second ports are connected are provided, and hydraulic oil sucked from one port is discharged from the other port.
The discharge direction of hydraulic oil is switched according to the rotation direction of the hydraulic pump 4 driven by the electric motor 8.

The hydraulic cylinder 3 is constituted by a double rod type hydraulic cylinder in which piston rods 35 and 36 project from both ends of the cylinder 33. First and second oil chambers 31 and 32 are defined inside the cylinder 33 by pistons 34, and the first and second oil chambers 31 and 32 have first and second passages 21 and 32, respectively.
22 are respectively connected.

The first and second oil chambers 31, 32 of the piston 34
, The combined volume of the first and second oil chambers 31 and 32 does not change even if the hydraulic cylinder 3 expands and contracts, eliminating the flow of hydraulic oil into and out of the tank 20, Poor suction can be prevented. In addition, the capacity of the tank 20 is reduced so that the power package 1
0 can be reduced in size.

The first and second passages 21 and 22 are provided with a check valve 4.
It communicates with the tank 20 via 1 and 42. Check valve 4
1 is opened for the flow of hydraulic oil flowing from the tank 20 to the first passage 21, the check valve 42 is opened for the flow of hydraulic oil flowing from the tank 20 to the second passage 22, Is replenished. The hydraulic circuit including the check valves 41 and 42 is housed in the pump block 40 together with the hydraulic pump 4.

A single relief valve 15 for releasing fluid pressure from one of the first and second passages 21 and 22 to the other is provided. Regulated by The relief valve 15 is connected to the first and second passages 21 and 22 through four check valves 11 to 14.
Interposed between That is, the first check valve 11 opens for the flow of hydraulic oil flowing from the first passage 21 to the inlet of the relief valve 15, and the flow of hydraulic oil flows from the outlet of the relief valve 15 to the first passage 21. A second check valve 12 that opens to the second passage 22;
A third check valve 13 opened for the flow of hydraulic oil toward the inlet of the second passage 2 and a second passage 2 from the outlet of the relief valve 15
And a fourth check valve 14 that opens for the working fluid flowing to the second.

In order to make the hydraulic cylinder 3 and the movable mass 2 function as a passive mass damper, a spring 7 for urging the movable mass 2 to a predetermined position with respect to the hydraulic cylinder 3 and one of the first and second passages 21 and 22 to the other. A communication passage 23 that guides hydraulic oil flowing to the communication passage; a throttle valve (a throttle means of the present invention) 24 that provides damping resistance to the hydraulic oil flowing through the communication passage 23;
A normally-open electromagnetic shut-off valve (communication passage opening / closing means of the present invention) 25 for opening and closing the communication passage 23 is provided.

The communication passage 23 is connected to the first and second passages 21 and 22 between the hydraulic cylinder 3 and the relief valve 15. The throttle valve 24 and the electromagnetic shutoff valve 2
5 is housed in the damper block 60.

The normally-open electromagnetic shut-off valve 25 is maintained at a position for opening the communication passage 23 when the solenoid is not energized.
At the time of the energization, the position is switched to a position where the communication path 23 is shut off against the spring.

The hydraulic pump 4 in the first and second passages 21 and 22
And a pair of electromagnetic shut-off valves (pump opening / closing means of the present invention) 26 and 27 for interrupting communication with the tank 20. Each electromagnetic shutoff valve 26, 27 is the first,
The second passages 21 and 22 are interposed between the relief valve 15 and the hydraulic pump 4. The electromagnetic shutoff valves 26 and 27 are housed in the electromagnetic valve block 50.

Normally closed electromagnetic shutoff valves 26 and 27
Is switched to a position in which the communication between the first and second passages 21 and 22 to the hydraulic pump 4 is cut off via the check valves 28 and 29 when the power is not supplied, and the first and second ports are opposed to the spring when the power is supplied. The position is switched to a position where the passages 21 and 22 are opened.

The coiled spring 7 is interposed between the cylinder 33 and the movable mass 2 such that the piston rod 35 is inserted inside the coiled spring 7.

Next, the operation will be described.

When the vibration damping device 1 functions as an active mass damper, the control unit energizes the respective electromagnetic shut-off valves 25, 26, 27 to cut off the communication passage 23, and to cut off the first and second passages 21, 22. Are opened to form a closed circuit connecting the hydraulic pump 4 and the hydraulic cylinder 3. In this state, by switching the rotation direction of the hydraulic pump 4 via the electric motor 8, the discharge direction of the hydraulic pump 4 is switched, and the hydraulic cylinder 3 expands and contracts, causing the movable mass 2 to reciprocate. The control unit controls the moving direction and the moving speed of the movable mass 2 according to the swing of the structure 9 detected by the sensor, so that the swing of the structure 9 is canceled by the reaction force acting on the movable mass 2.

This operation will be described in detail. When the hydraulic pump 4 rotates in one direction, the hydraulic oil in the first oil chamber 31 is sucked into the hydraulic pump 4 through the first passage 21 and discharged from the hydraulic pump 4. The operating oil that is supplied is pumped through the second passage 22 to the second oil chamber 32, and the piston 34 moves rightward in FIG. Conversely, when the hydraulic pump 4 rotates in the other direction, the operating oil in the second oil chamber 32 is
Hydraulic oil discharged from the hydraulic pump 4 is pumped into the first oil chamber 31 through the first passage 21, and the piston 34 moves leftward in FIG.

As described above, since the hydraulic cylinder 3 is extended and contracted by switching the direction of rotation of the hydraulic pump 4, a servo valve for switching the flow of hydraulic oil and its hydraulic pressure source are not required, and high energy efficiency can be obtained. Thus, the structure is simplified, and the vibration damping device 1 is made compact.

When the vibration damping device 1 functions as a passive mass damper, the control unit controls each electromagnetic shut-off valve 2.
The energization of the valves 5, 26, 27 is stopped, the communication passage 23 is opened, the communication between the first and second passages 21, 22 and the hydraulic pump 4 and the tank 20 is cut off, and the throttle valve 24 and the hydraulic cylinder 3 are connected. Construct a closed circuit.

In this state, the movable mass 2 expands and contracts the hydraulic cylinder 3 against the spring 7 as the structure 9 shakes. When the piston 34 moves rightward in FIG.
The hydraulic oil in the second oil chamber 32 is sent to the first oil chamber 31 through the second passage 22, the communication passage 23, and the first passage 21. Conversely, when the piston 34 moves to the left in FIG.
The hydraulic oil in the first oil chamber 31 is sent to the second oil chamber 32 through the first passage 21, the communication passage 23, and the second passage 22.

As the hydraulic cylinder 3 expands and contracts in this manner, hydraulic oil flows through the communication passage 23, and the throttle valve 24 provides damping resistance to the flow of the hydraulic oil, thereby absorbing vibration energy. To prevent the structure 9 from shaking.

In the event of a power failure, each electromagnetic shut-off valve 25, 2
When the energization of the hydraulic cylinders 3 and 27 is stopped, the vibration damping device 1 is automatically switched to a closed circuit connecting the throttle valve 24 and the hydraulic cylinder 3, so that the movement of the hydraulic cylinder 3 is not locked and the hydraulic cylinder 3 functions as a passive mass damper.

Each of the electromagnetic shut-off valves 26 and 27 is first,
By opening and closing the second passages 21 and 22 between the relief valve 15 and the hydraulic pump 4, each of the electromagnetic shut-off valves 26,
Regardless of the opening and closing of the valve 27, the relief valve 15 operates, and the pressure rise in the first and second passages 21 and 22 is regulated to a predetermined value or less.

As another embodiment, the throttle valve 24 is connected to the communication passage 2 in accordance with the magnitude of the swing detected by the sensor.
Alternatively, the damping resistance applied to the hydraulic oil flowing through 3 may be changed.

As still another embodiment, as shown in FIG. 4, a spring 7 is interposed between the movable mass 2 and the structure 9 to urge the movable mass 2 to a predetermined position with respect to the hydraulic cylinder 3. You may.

It is obvious that the present invention is not limited to the above-described embodiment, but can be variously modified within the technical concept thereof.

[Brief description of the drawings]

FIG. 1 is a configuration diagram of a vibration damping device showing an embodiment of the present invention.

FIG. 2 is a side view of the power package.

FIG. 3 is a hydraulic circuit diagram of the power package.

FIG. 4 is a configuration diagram of a vibration damping device showing another embodiment.

FIG. 5 is a configuration diagram of a vibration damping device showing a conventional example.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 damping device 2 movable mass 3 hydraulic cylinder 4 hydraulic pump 7 spring 8 electric motor 9 structure 10 power package 21 first passage 22 second passage 23 communication passage 24 throttle valve 25 to 27 electromagnetic shut-off valve

──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. ⁷ Identification code FI Theme coat ゛ (Reference) F16F 15/02 F16F 15/02 C F15B 11/00 D (72) Inventor Kosuke Sato Komatsu, Minato-ku, Tokyo 2-4-1 World Trade Center Building Kayaba Industry Co., Ltd. F-term (reference) 3H089 AA61 CC02 DA02 DA14 DB03 DB13 DB44 DB48 DB65 EE31 GG02 HH08 HH16 JJ20 3J048 AA05 AB07 AC04 AD06 BE03 BF08 BG02 CB21 DA04 EA38 3J0EE EE63

Claims (6)

[Claims] 1. A movable mass provided displaceably with respect to a structure, a hydraulic cylinder moving the movable mass, a hydraulic pump driven by an electric motor, and a closed circuit connecting the hydraulic pump and the hydraulic cylinder. A vibration damping device, comprising: first and second passages configured to switch a discharge direction of the hydraulic pump in accordance with a swing of the structure. 2. The control system according to claim 1, wherein the hydraulic pump is connected to the hydraulic cylinder, and the electric motor, the hydraulic pump, the hydraulic cylinder, and the first and second passages are unitized. Shaking device. 3. A spring for urging the movable mass to a predetermined position; a communication path connecting the first and second paths bypassing the hydraulic pump; and applying a resistance to hydraulic oil flowing through the communication path. 3. The vibration damping device according to claim 1, further comprising: a throttle unit; and a communication passage opening / closing unit that opens and closes the communication passage. 4. 4. A normally-open electromagnetic shut-off valve as said communication passage opening / closing means, which shuts off said communication passage when energized and opens said communication passage when not energized. Damping device. 5. A relief valve for releasing fluid pressure from one of the first and second passages to the other, and a pump opening and closing means for opening and closing the first and second passages between the relief valve and the hydraulic pump. The vibration damping device according to claim 3 or 4, further comprising: 6. A normally closed electromagnetic shut-off valve for opening and closing the first and second passages when electricity is supplied and for shutting off the first and second passages when electricity is not supplied as the pump opening / closing means. The vibration damping device according to claim 5, wherein