JP2589590B2 - Damping device - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a vibration damping device that suppresses a high-rise building from shaking against an earthquake or wind.

(Prior Art) The present inventors have disclosed in Japanese Patent Application Laid-Open No. 2-167959 a movable weight support for a movable weight which is configured to be movable on a base in a horizontal direction and to support only a vertical load. Department and
A coil spring device interposed between the movable weight and a position restoring function and a trigger function of the movable weight; and a coil spring device provided between the movable weight and a base. There has been proposed a seismic isolation device in which the gantry is mounted on the base via three types of devices arranged independently of each other with a vibration energy absorbing damper.

(Problem to be Solved by the Invention) The movable weight has a large weight, and when used as a weight (additional weight) of a dynamic vibration absorber, a large vibration damping effect is expected.

However, no matter how small the resistance of the movable bearing portion of the movable weight is, the movable weight has a frictional resistance to move horizontally, and the vibration of the movable weight is smaller than the frictional resistance of the movable weight. In other words, the same weight does not move, and the damping effect is not exhibited.

The present invention has been proposed in view of such a problem, and it is an object of the present invention to provide an active-type vibration damping device in which the movable weight can exert an effect as a dynamic vibration absorber even in a minute vibration.

(Means for Solving the Problems) In order to achieve the above object, a vibration damping device according to the present invention is provided with a movable weight that is horizontally movable on a base and is configured to support only a vertical load. A spring device interposed between the movable weight and the base, and having a position restoring mechanism for the weight, and a movable device provided between the movable weight and the base. In a vibration damping device in which the movable weight is installed on the base via the respective devices arranged independently of each other with the vibration energy absorbing damper of the weight, the movable weight and the base are mounted on the movable weight. A driving device for forcibly generating the movable weight is disposed between the reaction force support and the driving force support, the driving device having one end connected to the reaction force support and the other end connected to the reaction force support. It is composed of an actuator connected to the movable weight, and the movement of the movable weight and the base is performed. Vibration sensor to measure the vibration and the detection signal of the sensor,
The movable weight is provided with a control device for applying a force in a direction opposite to a frictional resistance acting on the weight.

(Operation) Since the present invention is configured as described above, in the case of a small vibration, the driving device disposed between the movable weight and the reaction force support causes the movable weight to be movable. By simply applying an external force in the direction opposite to the frictional resistance acting on the movable weight and cutting off the frictional resistance at the movable bearing portion of the movable weight, the movable weight exhibits a vibration damping effect as a dynamic vibration absorber. It is to let.

Furthermore, when the structure receives a large vibration such as a large earthquake or a typhoon, the movement of the movable weight and the base is measured by a vibration sensor in the control device, and the detection signal of the sensor is used to measure the movement of the driving unit including the actuator. Activate the device, forcibly apply a force to the movable weight in the opposite direction to the frictional resistance acting on the same weight by the same driving device,
An active vibration damping function that suppresses the vibration of the structure and suppresses the vibration quickly is provided.

The present invention will be described below with reference to the drawings.

3 and 4 show one embodiment of the present invention, and (1)
Is a base such as a fixed floor, and (2) is a movable weight on which an additional weight for adjusting the weight is loaded, and a frame for loading the additional weight is shown in the drawing. Movable weight (2)
A bearing ball (3) is mounted below the support point of
The bearing ball (3) is rotatably supported on a horizontal bearing ball receiving plate (4) fixed on the upper surface of the base (1), and the bearing ball (3) and the bearing ball (3) Thereby, the movable support portion of the gantry is configured, the support portion supports only a vertical load, and the gantry moves freely in the horizontal direction, so that resistance during the movement is minimized.

A coil spring (5) is connected to a rope (6) at one end thereof. The coil spring with the rope (5) is arranged in a cross shape, and the free end of the coil spring (5) is connected to the base (1). ) Is fixed to a stopper (7) disposed thereon, and the free end of the cord (6) is coupled to a stopper (8) disposed on the movable weight (2).

The rigidity of the coil spring (5) is set so that the rigidity and the fixed period determined by the upper movable weight (2) and the weight loaded thereon are the same as the primary natural period of the structure. Thereby, the swing of the structure can be reduced.

Further, a cylindrical container (9) is installed on the base (1), and a moving member suspended from the movable weight (2) in a viscous fluid (10) filled in the container (9). (11) is inserted to constitute a vibration energy absorbing damper.

The above configuration is described in detail in the above-mentioned Japanese Patent Application Laid-Open No. 2-167959.

Further, a driving device (12) is interposed between the movable weight (2) and a reaction force support (A) such as a structure side wall disposed on the base (1), and the driving device (12) is provided. 12) is a movable weight (2)
Are arranged at four diagonal corners and are joined to the reaction force support (A) by a rotatable pin joint so that a force can be applied to the movable weight (2) in any direction. I have.

FIG. 5 shows the relationship between the applied force and the deformation when the movable weight is deformed, and FIG. 5 shows the relationship when the movable weight (2) is deformed. It shows the relationship between force and deformation. As is clear from FIG. 5, the deformation of the movable weight (2) is zero until a force corresponding to the frictional resistance acts, and when the same force as the frictional resistance acts, the frictional force is canceled. In addition, the deformation increases according to the restoring force characteristic of the weight. The force acting on the stationary movable weight is an inertial force, and the movable weight (2) does not move unless the inertial force exceeds the frictional resistance.

Next, a method of detecting the reversal of the direction of the frictional resistance will be described.

 The frictional resistance F is represented by the following equation.

F = μW However, μ Friction coefficient W Weight of additional weight The acting direction acts in the opposite direction to the moving direction. Accordingly, the equation of motion is as follows.

m + c + Kx + μmg sgn () = υ (acceleration) (velocity) (displacement) (frictional force) As is apparent from the above equation, the frictional force is equal in μmg, and only positive and negative values are generated. Therefore, the frictional resistance can be always canceled by measuring the vibration speed of the additional weight with a vibrometer and applying a μmg force in the direction opposite to the direction of the speed.

The vibration sensor (13) shown in FIG.
6) Oscillator (14) Controller (17) and driving device.

Next, the direction in which the additional weight is moved first will be described. The principle of vibration suppression of a vibration damping device using an additional weight used for reducing vibration of a structure is as follows. The additional weight oscillates with a phase shift of 90 degrees. " If there is no frictional resistance in the support of the additional weight, the additional weight (8) will naturally vibrate with a phase shift of 90 degrees, but in actuality, in the case of a small earthquake or wind, the additional weight (8) will not easily vibrate . Therefore, when the additional weight is stopped, the vibration of the structure is measured by the vibration sensor. When the displacement of the vibration of the structure becomes maximum (the speed is zero and the acceleration is maximum), the direction in which the displacement of the structure returns is Conversely, the actuator is moved by applying force to the additional weight. Thereafter, a constant force may be applied in a direction opposite to the speed of the additional weight. In addition, since the control is not performed actively, it is considered that the adjustment is automatically performed during the vibration even if the direction in which the first movement starts is slightly different.

Accordingly, by applying a force to cancel the frictional resistance by the driving device, a displacement is generated even with a small vibration, and the movable weight (2) vibrates at a natural period determined by its weight and the rigidity of the spring. It will be.

FIG. 1 shows an embodiment of the present invention configured to cut off the frictional resistance, wherein a base (1) and a movable weight (2) are provided.
The vibration sensor (13) is provided, and the vibration sensor (1
3) is connected to a vibration amplifier (16), an oscillator (14), and a controller (17), a detection signal of the vibration sensor (13) is input to a controller (17), and a driving signal is supplied to the driving device (12). It is configured to be emitted.

Since the illustrated embodiment is configured as described above,
If the inertial force applied to the movable weight (2) during the initial vibration is smaller than the frictional resistance between the bearing ball (3) and the receiving plate (4), the base (1) and the movable weight (2) ), The movable weight (2) is stationary while the base (1) is moving (that is, the movable weight (2) is moved by the base (1)). ) And the vibration amplifier (16), oscillator (14),
A detection signal is sent to the controller (17), and a drive signal is sent to the driving device (12) by the controller (17).
A force is applied to the movable weight (2) in the direction opposite to the frictional resistance through the device (12).

Thus, when relative displacement occurs between the movable weight (2) and the base (1), the ball bearing (3) mounted on the movable weight (2) receives the bearing ball on the base (1). By rolling on the plate (4), the movable weight (2)
Moves smoothly horizontally and operates as a dynamic vibration absorber.

Accordingly, the moving member (11) suspended from the movable weight (2) has a viscous fluid (10) contained in a cylindrical container (9).
The movement inside creates a viscous drag, which absorbs vibration energy.

Since the container (9) of the vibration energy absorbing damper is circular, it acts evenly in the horizontal 360 ° direction.

When the external force acting on the movable weight (2) is removed, the movable weight (2) returns to its former position by the coil spring (5) and the driving device (12).

According to the above embodiment, the movement of the base (1) and the movable weight (2) is always measured by the sensor (13), and the detection signal from the sensor (13) is input to the oscillator (14) and the controller (17). The controller (17) issues a drive signal to the drive device (12) to perform an operation of only applying a force in the opposite direction to the frictional resistance to the movable weight (2), thereby providing a vibration damping effect. It is possible to perform analysis of a computer or the like and difficult control if unnecessary.

When the external force acting on the movable weight (2) is large, for example, when the structure receives a large earthquake or a typhoon, the movable weight moves naturally without operating the driving device (12). Exhibits the vibration damping effect as a vibration absorber.

FIG. 2 shows another embodiment of the present invention, wherein the vibration sensor (13) comprises a vibration meter amplifier, a controller (17), an A / D
The movable weight (2) swings as described above and is connected to the converters (18) and (19) and the computer (15), and when the swing exceeds a certain swing, the detection signal from the vibration sensor (13) is detected. However, the A / D converter (18) (19) computer (1
5), a control signal is issued to the driving device (12) via the controller (17), and the external force applied to the movable weight (2) by the driving device (12) is controlled, and the active vibration Control becomes possible.

(Effects of the Invention) According to the present invention, in the control device as described in the above-mentioned Japanese Patent Application Laid-Open No. 2-167959, the movable weight is provided between the movable weight and a reaction force support provided on a base. By disposing a driving device that forcibly generates a displacement, the frictional force applied to the movable weight by the same driving device in the direction opposite to the frictional resistance force applied to the movable weight by the same driving device at the time of micro-vibration, to cut the frictional resistance, The vibration damping effect is effectively exerted even at the time of minute vibration.

Thus, the driving device includes an actuator having one end connected to the reaction force support and the other end connected to the movable weight, and a vibration sensor for measuring the movement of the base and the movable weight. In response to the detection signal, the movable weight is provided with a control device that applies a force in a direction opposite to the frictional resistance acting on the same weight, so that even in the case of minute vibration, the movable weight can serve as a dynamic vibration absorber. Active vibration control that exerts the effect described above has been made possible.

[Brief description of the drawings]

FIGS. 1 and 2 are side views showing respective embodiments of the vibration damping device according to the present invention, respectively. FIGS. 3 and 4 are side views each showing a vibration damping device main body portion together with a bottom view. FIG. 5 is an explanatory diagram showing the relationship between the force and displacement of the vibration damping device when the movable weight is deformed. (1) ... base, (2) ... movable weight, (3) ... bearing ball, (4) ... bearing ball receiving plate,
(5) ... coil spring, (6) ... cable, (7) ... stopper, (8) ... stopper, (9) ... cylindrical container, (1)
0) Viscous fluid (11) Moving member (12) Driving device (13) Vibration sensor (14) Oscillator
(15) Computer, (16) Vibration amplifier,
(17) ... Controller, (18) ... A / D converter, (1
9)… D / A converter, (A)… reaction force support.

 ────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Takeshi Miyama 4-6-115 Sendagaya, Shibuya-ku, Tokyo Inside Fujita Industries Co., Ltd. (56) References JP-A-1-105879 (JP, A) JP-A-1 -207575 (JP, A) JP-A-2-167959 (JP, A)

Claims (1)

(57) [Claims] 1. A movable weight support portion of a movable weight which is horizontally movable on a base and is configured to support only a vertical load, and is interposed between the movable weight and the base. A spring device having a weight position restoring mechanism, and a vibration energy absorbing damper of the movable weight provided between the movable weight and the base, each of the devices being independently disposed. In the control device in which the movable weight is installed on the base via, the movable weight is forcibly displaced to the movable weight between the movable weight and a reaction force support member disposed on the base. And a driving device for causing the
One end is constituted by an actuator connected to the reaction force support, the other end is connected to the movable weight, a vibration sensor for measuring the movement of the movable weight and the base, and receiving a detection signal of the sensor, A vibration damping device comprising a control device that applies a force to a movable weight in a direction opposite to a frictional resistance force acting on the weight.