JP3063016B2 - Vibration suppression device using linear motor - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vibration damping device using a linear motor.

[0002]

2. Description of the Related Art A conventional active vibration damping device detects vibration of a structure caused by an earthquake or wind by a control device, sends a control signal obtained by the control device to a drive device, and activates the drive device. Then, an additional load for damping is applied. The driving device uses an electrohydraulic actuator, or drives the additional mass using a rotary motor and a ball screw or gear.

[0003] In addition, the drive unit is partially used together with a coil spring or the like to reduce the driving force of the drive unit, and when the drive unit is not used, an additional load for vibration suppression is applied to the structure to be damped. By vibrating in synchronism, the damping effect is enhanced.

[0004]

One of the means for improving the damping effect is to increase the amount of movement of the additional mass for damping. When the cylinder is driven by an electro-hydraulic actuator, (a) the cylinder is It needs to be long, and the cost increases dramatically. (B) The characteristics of the actuator are different between the case where the cylinder is extended and the case where the cylinder is retracted, and the control becomes complicated. (C) In order to use the actuator as a tuned mass damper without driving the actuator in combination with a spring or the like, the actuator needs to be devised. There are problems such as.

On the other hand, when the vibration damping additional mass is driven by using a rotary motor and a ball screw or a gear, (a) the rotational motion is changed to a linear motion, and the efficiency is inevitably reduced. (B) Control delay and impact acceleration due to backlash occur. (C) It is necessary to pay attention to the design (rigidity, lead angle, etc.) of the ball screw.

In order to further enhance the damping effect, it is necessary to increase the additional weight. However, when an electrohydraulic actuator or a rotary motor and a ball screw or a gear are used, the driving force is increased to increase the mass. A proportional capacity or number of drives is required.

The present invention is proposed in view of the above-mentioned problems, and an object thereof is to provide a tuned mass damper which can solve the problem of loss and backlash caused by a motion converting mechanism and has high performance. Can easily increase the thrust, simplify the structure,
An object of the present invention is to provide a vibration damping device for a structure using a linear motor that can reduce the cost and easily adjust the stroke and the thrust.

[0008]

In order to achieve the above object, a vibration damping device using a linear motor according to the present invention comprises a linear motor stator and a linear motor arranged above a vibration damping additional mass. An attachment for fixing both ends of the stator to the structure to be damped and a linear motor stator supported by the same linear motor stator and a linear motor movable element connected to the additional mass for vibration suppression via a jig. A linear motor configured to drive a mass, a slide mechanism interposed between the additional mass for vibration suppression and the structure to be damped, and a restoring force mechanism between the linear motor mover and the mounting body. And a damping mechanism is interposed between the lower surface of the additional mass for vibration damping and the upper surface of the structure to be damped (claim 1).

Further, in the vibration damping device according to the first aspect, the linear motor, the restoring force mechanism, and the damping mechanism are disposed in two directions orthogonal to each other, and the movable element of each linear motor is connected via a rod and a jig. It is connected to the additional mass for vibration suppression (claim 2).

[0010]

The vibration damping device of the present invention is configured as described above, and when the structure to be damped vibrates due to an earthquake or wind,
This vibration is detected by the control device, and the obtained detection signal is sent to the linear motor, and a linear control force for reducing the vibration of the structure to be damped is added to the additional mass for damping,
The structure to be damped is damped. As described above, the present vibration damping device is usually used as a so-called active mass damper that actively operates in response to a shaking of a structure to be damped due to an earthquake or the like.

When the linear motor is not controlled for any reason or reason, the power supply to the linear motor is stopped to bring the linear motor into a non-operating state, while the vibration damping additional mass and the accompanying A vibration system including a mass to be controlled, a restoring force mechanism, and a damping mechanism is vibrated in synchronization with the period of the structure to be damped, and the vibration damping device is used as a tuned mass damper.

[0012]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of a vibration damping device according to the present invention. When the vibration damping device of the present invention is installed on a structure for the purpose of reducing the vibration of the structure due to a wind or an earthquake, a vibration damping device driven in the same direction is used for the vibration damping in one direction (FIG. 1 to FIG. 1). (See FIG. 3). Further, when performing vibration suppression in two directions, the linear motor is installed in two directions orthogonal to each other (see FIGS. 4 and 5).

1 to 3, reference numeral 1 denotes an additional mass for damping, 2 denotes a structure to be damped, and the additional mass 1 for damping passes through a ball bearing (slide mechanism) 3. It is movably supported by the target structure 2. Reference numeral 4 denotes a linear motor for imparting a linear motion to the additional mass 1 for damping.
The linear motor 4 is controlled based on a control signal from a control device that detects vibration of the structure to be damped due to an earthquake or wind.

4a is a linear motor mover, 4b is a linear motor stator, and the linear motor stator 4b is disposed above the vibration damping additional mass 1, and both ends of the stator 4b are attached to the mounting body 11. The linear motor mover 4a is fixed to the damping target structure 2 through the linear guide 5 and the pin 6 (a jig).
And the linear motor mover 4a is connected to the mounting body 11 via the coil spring 7 (restoring force mechanism), so that the linear motor mover 4a and the upper surface of the damping target structure 2 A viscous damper 10 (damping mechanism) is provided between the additional mass 1 and the lower surface of the additional mass 1.

The viscous damper 10 is used for
Container (container filled with viscous material) 8 disposed on the upper surface of
The resistance plate 9 is provided vertically on the lower surface of the vibration damping additional mass 1 and immersed in a viscous body in the container 8.

Next, the operation of the vibration damping device will be specifically described. The controller detects the vibration of the damping target structure 2 at the time of an earthquake or the like, and sends a detection signal obtained at that time to the linear motor 4 to move the movable element 4 a, the linear guide 5, and the pin 6.
By driving the additional mass 1 for damping through the above, the damping control of the damping target structure 2 is performed.

The additional mass 1 for damping is given a restoring force by a coil spring 7, and the additional mass 2 to be damped is a viscous damper 1.
0 gives a damping force. As described above, the additional mass 1 for vibration damping is driven by the linear motor 4 to reduce the vibration of the structure 2 to be damped, but if the vibration is not damped for any reason, the linear motor 4 Stop supplying power to
A vibration system including the additional mass for vibration damping 1, the viscous damper 10, and the coil spring 7 is vibrated in synchronization with the period of the structure 2 to be damped.

FIGS. 4 and 5 show a vibration damping device which operates in two horizontal directions. A linear motor 4, a coil spring 7 and a viscous damper 10 are arranged in two orthogonal directions. 4 a is connected to the vibration damping additional mass 1 via the rod 12, the linear guide 5 and the pin 6.

[0019]

As described above, the vibration damping device using the linear motor of the present invention detects the vibration by the control device when the structure to be damped vibrates due to the earthquake or wind as described above.
The obtained detection signal is sent to a linear motor, and a linear control force that reduces the vibration of the structure to be damped is applied to the additional mass for vibration suppression, thereby damping the structure to be damped. The problem of loss, backlash, and the like caused by the conversion mechanism can be solved.

When the linear motor is not controlled for any reason or reason, the power supply to the linear motor is stopped to put the linear motor in a non-operating state, while the vibration-suppressing additional mass and the accompanying Since the vibration system composed of the mass and the restoring force mechanism and the damping mechanism vibrates in synchronization with the period of the structure to be damped, a tuned mass damper with good performance can be obtained.

Further, since the lengths of the linear motor stator and the linear guide can be increased, the stroke of the vibration damping additional mass can be easily increased.

Further, the number of linear motor movers can be increased for one linear motor stator, and the thrust can be easily increased.

Further, since the movable direction of the mass damper type vibration damping device constituted by the restoring force mechanism for damping additional load, the damping mechanism and the driving mechanism is limited to one direction, the structure can be simplified and the cost can be reduced. In addition to the reduction, the stroke and the thrust can be easily adjusted.

[Brief description of the drawings]

FIG. 1 is a plan view showing a vibration control device using a linear motor according to an embodiment of the present invention, with a part thereof cut away.

FIG. 2 is a view taken in the direction of arrows in FIG. 1;

FIG. 3 is a roll view of FIG. 1;

FIG. 4 is a plan view, partially cut away, of another embodiment of the present invention, and is a ha-ha diagram of FIG. 5;

FIG. 5 is a view as viewed in the direction of arrows in FIG. 4;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Additional mass for vibration suppression 2 Structure to be damped 3 Slide mechanism (ball bearing) 4 Drive mechanism (linear motor) 4a Linear motor mover 4b 固定 Stator 5 Jig (linear guide) 6 〃 (pin) 7 Restoring force mechanism (coil spring) 8 Viscous body container of damping mechanism 9 抵抗 Resistance plate 10 Damping mechanism (viscous damper) 11 Mounting body 12 Rod

────────────────────────────────────────────────── ─── Continued on the front page (72) Inventor Mitsuharu Hirasawa 4-6-115 Sendagaya, Shibuya-ku, Tokyo Inside Fujita Corporation (72) Inventor Kiyoshi Tanaka 4-6-115 Sendagaya, Shibuya-ku, Tokyo Fujita Corporation (72) Inventor Yoshiya Nakamura 4-6-1 Sendagaya, Shibuya-ku, Tokyo Fujitanai Co., Ltd. (72) Inventor Masatake 4-6-1 Sendagaya, Shibuya-ku, Tokyo Fujitauchi Co., Ltd. (72) Invention Person Kazuya Murakoshi 4-6-15 Sendagaya, Shibuya-ku, Tokyo Fujita Co., Ltd. (56) References JP-A-3-28542 (JP, A) JP-A-60-109473 (JP, A) (58) Survey Field (Int.Cl. ⁷ , DB name) E04H 9/02 F16F 15/02

Claims (2)

(57) [Claims] 1. A linear motor stator disposed above an additional mass for vibration damping, and both ends of the linear motor stator are supported by the linear motor stator and an attachment body for fixing both ends of the linear motor stator to a structure to be damped. A linear motor that drives the vibration-damping additional mass by a linear motor mover connected to the vibration-damping additional mass via a jig is provided, and a linear motor is provided between the vibration-damping additional mass and the vibration-damping target structure. A slide mechanism is interposed, and a restoring force mechanism is interposed between the linear motor mover and the mounting body, and between a lower surface of the vibration damping additional mass and an upper surface of the vibration damping target structure. A vibration damping device using a linear motor, wherein a damping mechanism is interposed. 2. The linear motor, the restoring force mechanism, and the damping mechanism are disposed in two orthogonal directions, and a mover of each linear motor is attached to the vibration damping additional mass via a rod and a jig. A vibration damping device using the linear motor according to claim 1 connected.