JPH0314940A - Damping device - Google Patents

Abstract

PURPOSE:To reduce a installation space so as to improve damping efficiency by fitting into a frame a movable mass capable of moving in two directions perpendicular to a vertical line and providing fixed pistons, cylinders fitted slidably onto the pistons, and pressurized chambers for charging or discharging oil on both ends of the frame in the moving direction of movableness. CONSTITUTION:When a structure 1 is swung in the left direction, the oil pres sure in a pressurized chamber 12 on the right side end part in the axis direction of a mass 7 is raised and the oil pressure of a pressurized chamber 12 on the left side end part is lowered to actively move the mass 7 in the left direction. At this time, generated inertial reaction force acting on the mass 7 in the right direction eliminates deflection of the structure 1 in the left direction. When the structure 1 is swung in the right direction, the above operations are reverse. By repeating such operations, vibration is damped, and the deflection of the structure 1 is efficiently reduced. In this way, an installation space can be sub stantially reduce.

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to a vibration damping device.

[Prior Art] Various types of vibration damping devices have been developed in the past to control and reduce vibrations caused by wind force in high-rise buildings, vibrations caused by engine excitation force in ships, and the like.

The above-mentioned vibration damping device includes an axle type and a two-axle combination type.

Figure 4 shows an example of an axle-type vibration damping device, in which a freely movable shaft ffia is connected to bending force actuators b that are fixed in position and arranged on both sides in the damping direction. Then, oil whose pressure is controlled by a command from a control device (not shown) is supplied to the pond pressure actuator, and the quality
The FIA is actively moved and its inertial reaction force is used to dampen vibrations.

In the case of the above-mentioned single-axis damping device, in order to control free vibration,
As shown in the figure, it is necessary to arrange at least one on each of the X and Y axes.

Figure 5 shows an example of a two-axis combination type vibration damping device.
A mass C installed so as to be freely movable as shown in the figure
are connected to hydraulic actuators d which are disposed on both sides of the material in the X and Y axis directions and are fixed in position. Each hydraulic actuator d has an X. Since vibration damping in the Y-axis direction is performed using the same material mC, the materials are connected via a horizontally rotatable pin joint e.

[Problem to be solved by the invention] However, in the single-axis vibration damping device shown in FIG.
Since a vibration damping device in the axial direction and a vibration damping device in the Y-axis direction are installed, there is a drawback that the installation space becomes large.

In addition, in the two-axis combination type vibration damping device shown in Fig. 5, since the same ffic is connected from all sides via pin joints e, when operating simultaneously in the X and Y axis directions, each hydraulic actuator Since there is a misalignment between the direction of expansion and contraction of d and the direction of movement of mass C, vibration damping efficiency is poor, and moreover, if pin joint e has joint clearance r, as shown in an enlarged view in Figure 6, play will occur. Therefore, the control characteristics against high frequency vibrations were poor.

The present invention was developed in view of the above-mentioned circumstances, and requires less installation space than conventional vibration damping devices, has high damping efficiency, and has good control characteristics, especially against high-frequency vibrations. The purpose is to provide a shaking device.

[Means for Solving the Problems] The present invention includes a plurality of movable masses that are movable in two directions perpendicular to each other, respectively fitted in upper and lower positions within the same frame, and at both ends of each movable mass in the movement direction of the frame. a piston fixed to both ends in the moving direction of each movable mass; a cylinder into which the piston is slidably fitted in the moving direction of the movable mass; and a pressure-controlled cylinder formed between the cylinder and the piston. This invention relates to a vibration damping device characterized by being provided with a hydraulic actuator that is connected to a pressurizing chamber that supplies and discharges music.

[Function] Therefore, in the present invention, when vibration occurs in the structure, pressure-controlled pressure is supplied to the pressurizing chamber according to the vibration situation, and the movable mass is moved relative to the pressure chamber by the hydraulic pressure. When the structure is moved, vibrations in two directions perpendicular to each other are simultaneously damped by the inertial reaction force generated by this movement, and the structure is damped.

[Implementation example] Embodiments of the present invention will be described below with reference to the drawings.

FIGS. 1 to 3 show an embodiment of the present invention, in which a structure i
This figure shows a vibration damping device 2 that is hung on the ceiling of a building.

As shown in the figure, a frame 5 is provided which integrally includes hollow cylindrical parts 3 and 4 arranged vertically so as to be perpendicular to each other in the axial direction. , masses 6 and 7, each of which is a cylindrical movable mass, are slidably fitted in the axial direction of each of the cylindrical portions 3.4,
Furthermore, a piston 9 having a pressure receiving surface 8 formed thereon is fixed to both ends of each of the mats ffi 8, 7 in the fine direction, and the piston 9 is fitted inside each of the mats ffi 6, 7 so as to be slidable in the axial direction. Cylinder l supported at both ends of each cylindrical part 3.4
A pressurizing chamber {2 is provided between the inner surface of the cylinder IO and the pressure receiving surface 8 of the piston 9 to which pressure-controlled pressure can be supplied and discharged from a servo valve (not shown), and the hydraulic actuator l3 Configure.

In the figure, 14 is an acceleration sensor for the feed hanok, 15
16.17 indicates a bearing, and 16.17 indicates a sealing device.

According to the above configuration, when vibration occurs in the structure 1, the pressure-controlled ura 11 is supplied to the pressurizing chamber 12 according to the vibration situation, and the bending pressure directly applies each mass 6.7 to the structure 1. When the object 1 is moved in a manner that resists the vibration of the object 1, the inertial reaction force produced by this movement simultaneously damps the vibrations in two directions perpendicular to each other, thereby damping the vibration of the structure i.

For example, if structure 1 swings to the left in Figure 1,
When the pressure in the pressurizing chamber 12 configured at the right end of the mass 7 in the pongee direction is increased and the oil pressure in the pressurizing chamber l2 configured at the left end is lowered, the mass 7 actively moves to the left. moved,
The inertial reaction force acting to the right of the mass 7 generated at this time causes the structure l to swing to the left.

If the structure 1 swings to the right, perform the reverse operation of the above operation. As this operation is repeated, the vibrations are damped and the structure 1 is damped.

It goes without saying that the pressure in each pressurizing chamber 12 is controlled by a well-known control mechanism (not shown).

Therefore, according to the above, the mass 6.7 and the hydraulic actuator 13 are coaxially integrated, and the same frame 5
By providing masses 6 and 7 that can move in two directions perpendicular to each other at the upper and lower positions of the inside, the vibration damping device 2 can be greatly improved compared to conventional single-shaft type or two-shaft combination type vibration damping devices. Therefore, the installation space can be reduced.

Furthermore, as mentioned above, since the mass ffi6.7 and the bending force actuator l3 are coaxially integrated, the mass 6.7
．． The moving direction of the hydraulic actuator 7 and the expansion/contraction direction of the hydraulic actuator 13 always reliably match, and vibration damping efficiency can be greatly improved compared to conventional damping devices.

Furthermore, the pressure-receiving surfaces 8 of the pistons 9 fixed to both ends in the axial direction of each mass 6.7 directly receive the pond pressure of the pressurizing chamber l2, so the vibration efficiency is extremely high, and the bin joint e is adopted. There is no play as in the case (see FIG. 6), and good control characteristics can be ensured even against high-frequency vibrations.

It should be noted that the vibration damping device of the present invention is not limited to the above-described embodiments, and it goes without saying that various changes can be made without departing from the gist of the present invention.

[Effects of the Invention] As explained above, the vibration damping device of the present invention can produce various excellent effects as described below.

■ Two lines at right angles to each other at the top and bottom positions in the same frame.
By providing a movable mass that can move in the direction, the installation space for the vibration damping device can be significantly reduced compared to the conventional one.

<n> Since each movable mass and the hydraulic actuator are coaxially integrated, the direction of movement of the movable mass and the direction of expansion and contraction of the pressure actuator always match reliably, greatly improving vibration damping efficiency. I can do it.

■ Since each movable mass itself is moved by the hydraulic pressure of the pressurized chamber via pistons fixed to both ends, the excitation efficiency is high and good control characteristics can be ensured even against high-frequency vibrations. can.

[Brief explanation of the drawing]

Fig. 1 is a sectional view of an embodiment of the present invention, Fig. 2 is a sectional view taken in the direction of arrows 1 and 2 in Fig. 1, and Fig. 3 is a sectional view taken in the direction of Fig. 4 is a plan view showing an example of a conventional single-axis type vibration damping device, Fig. 5 is a plan view showing an example of a conventional two-axis combination type vibration damping device, and Fig. 6 is a plan view showing an example of a conventional two-axis combination type vibration damping device. FIG. 3 is an enlarged view of the pin joint of the shaking device. In the figure, l is a structure, 2 is a vibration damping device, 5 is a frame, 6,
7 is a mass (movable mass), 9 is a piston, 10 is a cylinder, 1L is oil, 12 is a pressurizing chamber, and 13 is a pressure actuator. Figure 1 i Box 4 7 Figure 5 ▼ Figure 6 C

Claims (1)

[Claims] 1) 2 at right angles to each other at the top and bottom positions in the same frame
A plurality of movable masses movable in the direction are respectively fitted, and a piston is fixed to both ends of the frame in the direction of movement of each movable mass; 1. A vibration damping device comprising a hydraulic actuator comprising a cylinder slidably fitted into the piston, and a pressurized chamber formed between the cylinder and the piston to supply and discharge pressure-controlled oil.