JPH0639851B2 - Vibration control device - Google Patents

Description

The present invention relates to a vibration control device that controls a vibration by moving a movable mass body using a ball screw.

In recent years, building structures such as buildings have become higher and larger in scale and the like, but due to the refinement of design methods, they tend to be flexible and lightweight. Therefore, strong winds and external disturbances such as earthquakes cause vibrations as shown by the dotted line in Fig. 1. Such vibrations make building residents uncomfortable, especially during earthquakes. May cause large vibrations. A vibration control device (1) shown in FIG. 2 has been conventionally used to solve such a problem. This vibration control device (1) is installed on a floor near the roof of the high-rise building (2) shown in FIG. 1, and has a movable mass body (3) capable of reciprocating, and this movable mass body (3). A hydraulic actuator (4) for moving the actuator, a hydraulic servo (5) for operating the actuator (4), a vibration sensor (6) for detecting the vibration of the high-rise building (2), and the movable mass body (3). skyscraper
It consisted of a spring (7) interposed between (2) and.

In the conventional vibration control device (1) having such a structure, when the high-rise building (2) which is a vibrating object tries to vibrate in the vibration direction shown in the figure, the vibration is detected by the vibration sensor (6). . Based on this detection signal, the hydraulic servo (5) causes the hydraulic actuator (4) to actuate a control force proportional to the vibration speed, so that the movable mass body (3) interlocked with this acts in the direction opposite to the vibration direction. It moved and its inertia controlled the vibration.

However, since the conventional vibration control device uses a hydraulic actuator, the device itself becomes quite large,
It required a lot of space for installation. It also had the drawbacks that it required maintenance quite often and was noisy.

The present invention has been made in order to eliminate the above drawbacks, and provides a vibration control device having a simple structure and easy maintenance. An embodiment of the present invention will be described below with reference to the drawings.

In Fig. 3, (8) is a drive motor.
(8) is fixed to the mount (9), and the shaft end of the ball screw (11) is fixedly fitted to the output shaft (10). This ball screw
(11) is near the end on the side where the drive motor (8) is fixed,
It is rotatably held by a bearing (12) fixed to the mount (9), and a nut (13) is screwed to a screw portion on the other end side. This nut (13) is fixed to the movable mass body (3), and the rotation of the shaft of the ball screw (11) causes the nut (13) to move.
A movable mass body (3) having a linear bearing (15) slidably fitted in (14) at its lower end is reciprocated back and forth.

(16) is a limit switch for electrically restricting the movement of the movable mass body (3), (17) is a mechanical stop, and (18)
Is a controller. (19) is the base holding the parts, (2
Reference numeral 0) is a cover that covers the whole body, and all the parts from the vibration sensor (6) to the movable mass body (3) are housed together.

Next, the operation of the vibration control device according to the present invention will be described. When the high-rise building (2) tries to vibrate in the vibration direction shown in the figure, the vibration sensor (6) detects the signal and the controller (18) detects the vibration acceleration. Send a signal. The controller (18) receives this signal,
After being integrated and converted into a speed signal, a current corresponding to the speed signal is sent to the drive motor (8), so that the drive motor (8) generates torque T corresponding to the vibration speed and rotates. By this,
The nut (13) screwed to the ball screw (11) fixedly fitted to the drive motor (8) is in the direction opposite to the vibration direction if friction is ignored. L: Because it receives the control force of the lead length of the ball screw, and moves with the movable mass body (3),
Vibrations of the tall building (2) are damped.

The equation of motion at this time is expressed by the following equation.

Where m ₁ : modal mass of high-rise building k ₁ : spring constant of 〃 m ₂ : mass of movable mass k ₂ : spring constant between movable mass and high-rise building Displacement, speed, acceleration of high-rise buildings Displacement, velocity and acceleration of the movable mass F: External force U: Control force C: Gain constant If the magnitude of the vibration velocity exceeds the set value, the momentum of the movable mass (3) becomes large and it is attached to this. The protrusions (20) thus pushed push down the limit switch (16) to open the circuit, so that the current to the drive motor (8) connected in series with this is cut off. Therefore, the movable mass body (3) is
A spring (not shown) formed between (19) and the spring (19) pushes it back to the neutral point, thus avoiding collision with the stopper due to overload.

As described above, the shaft of the drive motor (8) is engaged with the ball screw (11), and the movable mass body (3) is fixed to the nut (13) of the ball screw (11). For output torque T generated by (8) The propulsive force of acts on the movable mass body (3). That is, if a force of 50 kg is required as the control force for moving the movable mass body (3), the required tokule of the motor is 8 kg-cm if the lead length is 1 cm, and a considerably small motor is sufficient. It will be. Vibration sensor (6), movable mass
(3), the ball screw (11), the drive motor (8), the controller (18), etc. are arranged on the same base (19), so that the assembly is relatively easy, especially the drive motor (8). Axial direction and ball screw
Since the axial direction of (11) and the movable direction of the movable mass body (3) are in the same direction, the arrangement is simple, the whole structure can be compact, and the movable centering adjustment is easy. Furthermore, since the position of the vibration sensor (6) and the position of the movable mass body (3) to be controlled are in the same place, the magnitude and direction of the mode at each position are always the same for any vibration mode. Therefore, stable control is performed for all vibration modes.

In the above description, an example in which the vibration control device of the present invention is applied to a high-rise building has been described, but it goes without saying that it can also be applied to other vibrating objects such as general houses, towers, and Hashizome.

As described above, according to the present invention, as the actuator, the torque T corresponding to the vibration speed is generated, and the driving motor that rotates and the output torque T of the driving motor are compared. By using an actuator provided with a ball screw that applies the force of (1) to the movable mass body, there is an effect that the size of the device can be reduced and the space of the device can be saved.

If the vibration sensor, the movable mass, the controller, the drive motor and the ball screw are arranged on the same base, and the axial direction of the drive motor, the axial direction of the ball screw and the movable direction of the drive mass are in the same direction. Since the arrangement is simple and the overall size is small, there is an effect that it can be easily attached to a vibrating object which has been difficult to install in the past.

[Brief description of drawings]

FIG. 1 is a perspective view of a high-rise building, FIG. 2 is a view showing a vibration control device showing a conventional example, and FIG. 3 is a configuration diagram of a vibration control device according to the present invention, in which (3) is a movable mass body, (6) is a vibration sensor, (8) is a drive motor, (11) is a ball screw, (18) is a controller, and (19) is a base. The same or corresponding parts in the drawings are designated by the same reference numerals.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Nobuo Kamei 325 Kamimachiya, Kamakura City, Kanagawa Mitsubishi Electric Corporation Kamakura Factory (56) References JOURNAL OF THE ENGINEING MECANICS DIVISION Vol. 106, No. EM 6, 1980 December P. 1091 ~ 1098

Claims (3)

[Claims] 1. A vibration sensor for detecting vibration of a vibrating body, a movable mass body reciprocating on the vibrating body, a signal detected by the vibration sensor, and a current corresponding to a vibration speed of the vibrating body. A flow controller and a drive motor that receives a control current from the controller to generate a torque T corresponding to a vibration speed and rotates, and a shaft portion is coupled to an output shaft of the drive motor, and a rotational movement of the shaft portion is performed. With this, the nut that moves straight in the axial direction is connected to the movable mass body, and the output torque of the drive motor is A vibration control device comprising: a ball screw that applies a force (L is a lead length of the ball screw) to the movable mass body. 2. The vibration control device according to claim 1, wherein the axial direction of the drive motor, the movable direction of the movable mass, and the detection direction of the vibration sensor are the same. 3. The vibration control device according to claim 1, wherein the vibration sensor, the movable mass body, the controller and the ball screw are arranged on the same base.