JPH0431606Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a vibration control device that controls the vibration of a vibrating body such as a building by the movement of a movable mass member.

Now, a vibrating body 1 of a building etc. as shown in Fig. 1.
In recent years, a vibration isolating device using the principle of a mass damper as shown in FIG. 2 has been used as one of the vibration countermeasures. This MAAss damper has a movable mass member 4 attached to a vibrating body 1 via a spring 2 and an actuator 3, and a control force corresponding to the amount of vibration of the vibrating body 1 is applied to the movable mass member 4 from the actuator 3. The vibrating body 1 is moved back and forth using the reaction force.
Its operation is expressed by the following equation of motion.

Msa〓s＋Csa〓 _s ＋Ksa _s ＋Kd（a _s −a _d ）＝Fa−Fc
...(1) Mda _d + Kd (a _d - a _a ) = Fc ... (2) In the above formula, Ms is the mass of the vibrating body 1, a _s is the displacement of the vibrating body 1, and Cs is the displacement of the vibrating body 1. Damping constant, Ks is the spring constant of vibrating body 1, Kd is the spring constant of spring 2, Md
is the mass of the movable mass member 4, ad is the mass of the movable mass member 4
displacement, Fa is the external force, and Fc is the control force.

As mentioned above, the conventional vibration control device has _{a control force Fc=Cm.a〓 s that} is proportional to the vibration speed a〓 s of the vibrating body 1.
(Here, Cm is the gain constant) for actuator 3
The movable mass member 4 is moved in the direction of stopping the vibration of the vibrating body 1 to dampen the vibration, but the vibration of buildings and other structures is caused not only by vehicles running, but also by earthquakes and buildings underground. Since the direction in which the force is generated varies widely up to the point of driving, etc., vibration control devices are installed individually in two orthogonal axes as shown in Figure 3, and the component forces in each axis direction are suppressed. , has achieved its purpose. Note that in FIG. 3, for convenience, the vibrating body 1, the spring 2, the actuator 3, and the movable mass member 4 are shown.
In order to identify the movement of each of the two axes, subscripts X and Y are given to related equipment. However, since the vibration control device is installed separately for each axis, separate installation space is required for each axis, which reduces the utilization efficiency of buildings, etc., and also doubles the number of movable mass members with a high weight ratio, which reduces vibration. There were drawbacks, such as an increase in the cost of reinforcing the building to support the control equipment.

This idea was made to eliminate these drawbacks, and by sharing one movable mass member with a two-axis vibration control device, it is possible to create a vibration control device that is highly space efficient and relatively easy to support. It is intended to provide.

An embodiment of this invention will be described in detail below with reference to the drawings. FIG. 4 is a diagram showing a two-axis control vibration control device according to this invention, and FIG. 5 is a detailed view of FIG. 4 viewed from above. In order to identify the motion of each of the two axes, related equipment is given suffixes X and Y. Note that in FIG. 4, some related equipment is omitted for convenience. In FIGS. 4 and 5, reference numeral 3 denotes an actuator consisting of a movable core 5 and a support core 6. A movable mass member 4 is fixed to the tip of the movable core 5, and the support core 6 moves in the reciprocating direction of the movable core 5. It is supported on the vibrating body 1 while having a degree of freedom only within a plane that is orthogonal and parallel to the vibrating body 1 . Movable mass member 4
It is connected to an actuator 3 by a spring 2, and is designed to reciprocate in accordance with the reciprocating movement of the movable core 5. 7 is an accelerometer that detects the vibration of the vibrating body 1, and 8 is a controller that receives and amplifies the vibration signal and issues an input command to the actuator 3. A correction actuator 9 is fixed to the vibrating body 1 and is composed of a correction movable core 10 and a correction support core 11. An actuator 3 for the other axis is fixed to the tip of the correction movable core 10, and the correction actuator 9 is fixed to the vibrating body 1. As the movable core 10 reciprocates, it reciprocates only in a plane that is perpendicular to the reciprocating direction of the actuator 3 and parallel to the vibrating body 1. 12 is a position detector that detects the amount of reciprocating motion described above; 13 is a position detector that detects the amount of reciprocating motion in the axial direction of the movable mass member 4; and 14 is a component that receives the two detection signals described above and amplifies and corrects the difference. This is a correction controller that issues a correction command to the actuator 9.

The vibration control device of this invention having the above configuration detects the acceleration of each axis by the accelerometer 7 attached to the vibrating body 1, and sends a signal corresponding to each axis to the controller 8. The controller 8 receives the acceleration signal from the accelerometer 7 and controls the corresponding actuator 3 to generate a control force on the vibrating body 1 that is proportional to the vibration speed of the vibrating body for each axis. The actuator 3 generates a control force between the movable mass member 4 and the vibrating body 1 in proportion to their respective vibration speeds, vibrates the movable mass member 4 in a direction that stops the vibration of the vibrating body 1, and performs vibration damping. On the other hand, the position detector 13 provided on the movable mass member 4 detects the amount of reciprocating motion of the movable mass member 4 for each axis, and the position detector 12 provided on the actuator 3 detects the relative position of the actuator 3 for each axis. and sends each detection signal to the correction controller 14. The correction controller 14 is provided corresponding to the correction actuator 9, and inputs the output of the relative position detector 12 and the output of the position detector 13 for each axis, so that the difference between the two outputs becomes zero. The correcting actuators 9 corresponding to the respective correction actuators 9 are drive-controlled. Since the correction actuator 9 is driven until the difference between the two signals becomes zero, the relative position of the actuator 3 for the other axis is corrected by the amount of reciprocation of the movable mass member 4. Therefore, the reciprocating movement of one shaft is not affected.

In this way, the vibration control device of this invention can independently and smoothly apply corresponding predetermined control forces to one movable mass member from two mutually orthogonal directions. Furthermore, since one movable mass member is shared by the two-axis vibration control device, the device is characterized by high space efficiency and relatively easy device support.

In the above explanation, one movable mass member is shared by vibration control devices with two orthogonal axes, but the same effect can be obtained even if the vibration control device is expanded to a vibration control device with three orthogonal axes. Needless to say.

[Brief explanation of the drawing]

Figure 1 is a diagram showing the vibration state of buildings, etc., Figure 2 is a vibration model diagram of a general mass damper, Figure 3 is a diagram showing vibration suppression in any direction in a horizontal plane by a conventional mass damper, and Figure 4 is a diagram of this vibration model. FIG. 5 is a detailed view of FIG. 4 seen from above, showing an embodiment of the invention. In the figure, 1 is a vibrating body, 3 is an actuator, 4 is a movable mass member, 7 is an accelerometer, 8 is a controller, 9 is a correction actuator, 12 and 13 are position detectors,
14 is a correction controller. Note that the same reference numerals in the figures indicate the same or corresponding parts.

Claims (1)

[Scope of utility model registration request] A plurality of vibration detecting means each detecting acceleration in at least two axes generated in a vibrating body vibrating in response to an external force, one movable mass member reciprocating in a direction orthogonal to the vibrating body, and a movable part. are respectively coupled to the one movable mass member via springs so that their reciprocating directions are perpendicular to each other, and the support part has a degree of freedom in a plane perpendicular to the reciprocating direction of the movable part and parallel to the vibrating body. a plurality of actuators each supported on a vibrating body with a plurality of actuators; a plurality of relative position detectors provided on the plurality of actuators to detect relative positions of the actuators for each axis; a plurality of controllers that control the corresponding actuators to generate a control force on the vibrating body proportional to the vibration speed of the vibrating body for each axis in response to the acceleration signal detected by the vibration detection means; a plurality of correction actuators each coupled to the actuator and moving the corresponding actuator in a direction perpendicular to the reciprocating direction of the movable part of the actuator; a reciprocating motion detector to detect;
A plurality of actuators are provided corresponding to the plurality of correction actuators, and drive and control the respective correction actuators so that the difference between the output of the relative position detector and the output of the reciprocation amount detector for each axis is zero. A vibration control device comprising: a correction controller.