JPH0791486A - Active type vibration damping device - Google Patents

Abstract

PURPOSE:To provide a biaxial type active damping device which damp vibration in all directions in a horizontal plane through a simple mechanism and one measure. CONSTITUTION:A horizontally support measure 20 is supported to an upper support plane C paralleling the measure by means of four wires 21 intercoupled in the same height position as that of the center of gravity of the measure. Further, the measure 20 is supported by two hydraulic cylinders 22a and 22b located within planes A and B, passing the center of gravity G and crossing each other at right angles, and obliquely supported at the center of gravity G of the measure and the upper support plane C through respective ball joints 3. This constitution performs damping in all directions and operates the component in an X-direction of vibration by the cylinder 22b and a component in an Y-direction by the cylinder 22a without intercoupling the two hydraulic cylinders 22a and 22b and improves a damping effect.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a two-axis active vibration damping device.

[0002]

2. Description of the Related Art Various active damping devices have been disclosed.
FIG. 2 shows an example of a vibration damping device for only one direction, which is a device for driving a circular arc-shaped mass 4 on a roller 5 via a speed reducer 2 and a gear mechanism 3 by a motor 1 and damping the vibration.

On the other hand, FIG. 3 shows a device which is a two-way vibration damping device for damping vibrations in both the X and Y directions in a plane. This is one in which two unidirectional vibration damping devices shown in FIG. That is, the X-axis damping device is mounted on the Y-axis damping device. Therefore, the mass 4b of the Y-axis direction vibration control device
Are arranged in parallel with each other, and a vibration damping device in the X-axis direction is mounted on a connecting body connecting them.

FIG. 4 is also an example of a two-way vibration damping device.
This has one mass in the frame 9, and is structured so that the ball screw 7 is driven by the motor 1 and the mass 4 is driven in the χ axis direction or the У axis direction. Reference numeral 8 is a wire that supports the mass 4. The mechanism becomes extremely complicated in order to suppress the vibration in all directions in the horizontal plane by these two directions or one unit. In addition, this device can operate as a passive vibration damping device at the time of an abnormality such as a power failure, but at that time, it is not possible to change the required degree of damping and it is not possible to provide optimum damping. Further, the two-axis type vibration damping device as shown in FIG. 3 is inefficient because the two masses are respectively moved in two directions.

Further, FIG. 5 (Japanese Patent Laid-Open No. 204582/1990) shows a plurality of frames (four in the figure) mounted on the frame 11 provided on the building with the mass 7 and between the upper surface of the mass 7 and the frame. Arm 8
Horizontal displacement is freely supported by this, and the horizontal hydraulic cylinders 9, 9 are provided between the mass 7 and the frame 11 so as to intersect each other at 90 °, and the structure is provided on the side surface of the mass 7. It is provided with a plurality of dampers 10 for buffering the collision with. When the frame 11 shakes together with the building, the mass 7 tends to be displaced relative to the frame 11 due to the inertial force. On the other hand, hydraulic oil is supplied from the hydraulic pressure supply device to the hydraulic cylinder 9 at a rate according to the direction of the shaking, and as a result, the mass 7 is driven in the same direction as the shaking against the relative displacement. .

As a result, the cell 7 has four parallel arms 8
It swings along the arc specified in paragraph 1 while maintaining a horizontal posture. Further, the hydraulic cylinder 9 also rotates in the horizontal and vertical directions in response to the displacement of the mass 7 while rotating the universal joint 12. Along with the displacement of the mass 7, a reaction force based on the inertial resistance of the mass 7 acts on the hydraulic cylinder 9, and the reaction force is transmitted through the cylinder tube.
It provides the vibration damping force in the opposite direction to the swing. However, in this structure, since the two hydraulic cylinders 9 are horizontally mounted between the upper surface of the mass and the frame, the two hydraulic cylinders are coupled (interfere) with each other. As a result, the control law becomes complicated, and unnecessary force is applied to the cylinder, resulting in a very poor vibration damping efficiency.

[0007]

SUMMARY OF THE INVENTION A simple mechanism and yet one
It is an object of the present invention to provide a two-axis active vibration damping device that can perform vibration damping in all directions in a horizontal plane with one mass.

[0008]

[Means for Solving the Problems] Horizontally supported mass 20
A plurality of wires 21 having one end connected to the same height position as the center of gravity around the mass 20 and the other end supported by an upper support plane C parallel to the mass 20, and the center of gravity G of the mass 20. In two vertical planes A and B passing through each other and orthogonal to each other, one end is the center of gravity G of the mass 20, and the other end is the supporting plane C of the upper part.
The two hydraulic cylinders 22a and 22b are supported obliquely via a ball joint 23.

[0009]

[Operation] A hydraulic cylinder obliquely installed in the plane A of FIG.
When only the mass 22a is operated to vibrate the mass 20 in the Y direction, the B plane in the X direction vibrates similarly to the pendulum, and no force is applied to the hydraulic cylinder 22b in the B plane.
If the mass cylinder 20 is vibrated in the X direction by operating only the hydraulic cylinder 22b installed diagonally in the B plane, Y
The A plane in the direction vibrates similarly to the pendulum, and no force is applied to the hydraulic cylinder 22a in the A plane. Therefore, the two hydraulic cylinders 22a and 22b are not coupled to each other, but by operating the cylinder 22b for the X-direction component and the cylinder 22a for the Y-direction component of vibration, it is possible to suppress vibrations in all directions in the horizontal plane.

[0010]

EXAMPLE An explanation will be given with reference to FIG. In FIG. 1, reference numeral 20 denotes a square having a quadrangular shape in plan view, and four corners thereof are suspended horizontally by wires 21. Although it is not essential that the mass 20 has a quadrangular shape in plan view and that the number of the wires 21 is four, the case of the quadrangular mass will be described below. Mass 20 and wire 2
All points P connecting 1 are at the same height as the center of gravity G of the mass 20. The other end (upper end) of the wire 21 is supported at the point O on the same plane C (parallel to the horizontal plane passing through the center of gravity G). Two
2 is a hydraulic cylinder which passes through the center of gravity G, is in vertical planes A and B orthogonal to each other, and is at the same height as the fulcrum fulcrum O.
And the center of gravity G, respectively. The hydraulic cylinder 22 is attached via a ball joint 23 at the point Q and the center of gravity G.

[0011]

[Operation] Hydraulic cylinders 22a are provided in planes A and B which are orthogonal to each other.
And 22b are attached, the two hydraulic cylinders 22a and 22b can be operated without being coupled to each other.
Can be vibrated in any direction in the horizontal plane.
For example, a hydraulic cylinder installed in the A plane in the Y direction in FIG.
When only the mass 22a is operated to vibrate the mass 20 in the Y direction, the B plane in the X direction vibrates similarly to the pendulum and no force is applied to the hydraulic cylinder 22b in the B plane (hydraulic pressure). Since both ends of the cylinder support the ball joint 23, the hydraulic cylinder 22 can smoothly stay in the plane to which it belongs.

Therefore, vibration can be suppressed in all directions in the horizontal plane, and the two hydraulic cylinders 22a and 22b can be operated without being coupled to each other, so that the vibration damping efficiency is very good. Further, in an abnormal situation such as a power failure, the hydraulic cylinder 22 is operated as a damper to have an effect as a two-axis type passive vibration damping device. Further, damping can be freely adjusted by attaching a throttle valve to the hydraulic cylinder 22. By using the cylinder as a damper, an extra inertial load is less than that when an AC servo motor is used.

[0013]

[Effect] A horizontally supported mass, a plurality of wires connected at the same height position as the center of gravity of the mass are supported by an upper support plane parallel to the mass, and a plane A passing through the center of gravity G of the mass and orthogonal to each other. It was supported by two hydraulic cylinders supported by a ball joint between the center of gravity G of the mass and the upper support plane C in the plane B. Thus, a two-axis active vibration damping device having a very simple mechanism but capable of damping in all directions in the horizontal plane was obtained. Moreover, since the two hydraulic cylinders are not coupled to each other, it is possible to perform very efficient vibration damping.

[Brief description of drawings]

FIG. 1 is a perspective view of a biaxial vibration damping device according to the present invention.

FIG. 2 is a known one-way vibration damping device.

FIG. 3 is a known two-way vibration damping device.

FIG. 4 is another example of a known two-way control device.

FIG. 5 is another example of a known vibration damping device.

[Explanation of symbols]

 20 mass 21 wire 22,22a, 22b hydraulic cylinder 23 ball joint

Claims (1)

[Claims] 1. A horizontally supported mass, and a plurality of wires having one end connected to the same height position as the center of gravity around the mass and the other end supported by an upper support plane (C) parallel to the mass. When,
Two vertical planes (A) and a plane (B) which are orthogonal to each other and pass through the center of mass of the mass. One end is the center of gravity of the mass, and the other end is the supporting plane (C) of the upper part. Active damping system consisting of two hydraulic cylinders supported by