JP3222602B2 - Building vibration control device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an active vibration damping device which suppresses shaking of a building or the like due to an earthquake by driving an additional mass.

[0002]

2. Description of the Related Art As a vibration damping device for preventing a building or the like from shaking due to an earthquake, an additional mass is supported on the building via an actuator, and when the vibration of the building is detected, the additional mass is driven in the vibration direction of the building. An active vibration damping device that suppresses the vibration of the building by the reaction force is known.

[0003]

However, when the additional mass is supported by a plurality of actuators that stroke in the same direction, a difference occurs in the load applied to the actuator unless the actuator is arranged at the same distance from the center of gravity of the additional mass. In such a case, if the actuator is simply stroked with the same pressure, a difference occurs in the stroke distance of the actuator, and a twist occurs between the additional mass and the building. As a result, there is a possibility that an undesired phenomenon that the building causes torsional vibration due to the operation of the vibration damping device may occur.

[0004] The present invention has been made to solve the above problems, and has as its object to prevent torsional vibration of a building caused by a vibration damping device.

[0005]

SUMMARY OF THE INVENTION The present invention provides a plurality of actuators which stroke in the same direction in response to an input vibration control command signal, an additional mass supported by a building via these actuators, And a means for outputting the vibration suppression command signal in accordance with the vibration of the object.In the vibration damping device for a building, the difference between the stroke distance detected by the detecting means and the stroke distance detected by the detecting means is calculated. Means for correcting the vibration suppression command signal for each actuator so that the calculated difference is eliminated.

[0006]

By correcting the vibration suppression command signal to each actuator so as to eliminate the difference in the detected stroke distances, the stroke distances of the actuators become equal, and the twisting of the additional mass can be prevented.

[0007]

1 and 2 show an embodiment of the present invention.

In FIG. 1, reference numeral 1 denotes a building supported on the ground 2, and an additional mass 4 is supported on the roof of the building 1 through hydraulic actuators 5 and 6 arranged in parallel. Actuators 5 and 6 output signals i of adders 7 and 8
Displaces in the axial direction according to ₁ and i ₂ .

As shown in FIG. 2, these signals i ₁ and i ₂ are amplified by servo amplifiers 9 and 10, respectively, and then input to servo valves 11 and 12, where the amplified signals of servo valves 11 and 12 are amplified. The hydraulic pressure corresponding to i ₁ and i ₂ is supplied to the actuators 5 and 6 to expand and contract the actuators 5 and 6. When the actuators 5 and 6 are electrically driven, a motor driver may be used instead of the servo amplifier 9 (10) and a servo motor may be used instead of the servo valve 11 (12).

The signal i ₁ is obtained by adding the vibration suppression command signal f ⁰ x ₁ described later and the torsion compensation signal −α (Y ₁ −Y ₂ ) in the adder 7. Similarly, the signal i ₂ is obtained by adding the vibration suppression command signal f ⁰ x ₂ and the torsion compensation signal α (Y ₁ −Y ₂ ) in the adder 8.

A speed sensor (not shown) is attached to the building 1, and the output of the speed sensor is input to vibration control command circuits 13 and 16 shown in FIG. Damping command circuit 13 outputs to the adder 7 a damping command signal f ⁰ x ₁ in accordance with the speed signal. Further, the vibration damping command circuit 14 also damping command signal f ⁰ x ₂ and outputs to the adder 8 according to the speed signal.

Meanwhile, each of the displacement sensors 5A and 6A actuator 5 and the 6 is attached, the stroke distance signal Y ₁ and Y ₂ which they are output is input to the differential amplifier 15. The differential amplifier 15 outputs the difference (Y ₁ −Y ₂ ) to the torsion compensation circuits 14 and 17.

The torsion compensation circuit 14 outputs a torsion compensation signal -α (Y ₁ -Y ₂ ) obtained by multiplying the input signal from the differential amplifier 15 by a torsion compensation coefficient -α.

The torsion compensation circuit 17 outputs a torsion compensation signal α (Y ₁ −Y ₂ ) obtained by multiplying the input signal from the differential amplifier 15 by a torsion compensation coefficient α.

As a result, as the stroke distance Y ₁ of the actuator 5 becomes larger than the stroke distance Y _{2 of the} actuator 6, the servo command current to the servo valve 11 is corrected in such a direction as to reduce the valve opening.
The servo command current to 2 is corrected in a direction to increase the valve opening. That is, the damping command signal f ⁰ x ₁ and f ⁰ in the direction of the difference between the stroke distance of the two actuators 5 and 6 is eliminated
x ₂ is corrected.

Next, the operation will be described.

When the building 1 is vibrated, a speed sensor attached to the building 1 outputs a speed signal to the vibration suppression command circuits 13 and 16. Damping command circuit 13 and 16 respectively output a vibration command signal f ⁰ x ₁ and f ⁰ x ₂ corresponding to the speed signal to the adder 7 and 8.

In the stationary state, since the stroke distances of the actuators 5 and 6 are equal, the signals i ₁ and i ₂ input to the servo amplifiers 9 and 10 by the adders 7 and 8 at the beginning of the driving of the additional mass 4 are the vibration suppression command signals f It is equal to ⁰ x ₁ and f ⁰ x _2. The actuators 5 and 6 stroke with hydraulic pressure based on these signals, and displace the additional mass 4 in the same direction as the vibration direction.

According to the strokes of the actuators 5 and 6, the stroke distance signals Y ₁ and Y ₂ are output from the sensors 5A and 6A.
Is output, and the differential amplifier 15 inputs the difference (Y ₁ −Y ₂ ) to the torsion compensation circuits 14 and 17. The output of the stroke distance Y ₁ and Y ₂ when the same is twisted compensation circuit 14, 17 is zero, the compensation signal -α twist compensation circuit 14 and 17 when there is a difference according to the difference (Y ₁ - Y ₂ ) and α (Y
₁ -Y ₂ ) is output. Thus, the damping command signal so that the difference of the stroke distance (Y ₁ -Y ₂₎ is eliminated f ⁰ x ₁ and f
⁰ x ₂ is corrected.

The signals i ₁ and i ₂ output from the adders 7 and 8 after the start of the vibration damping operation cancel the difference in the stroke distance detected by the displacement sensors 5A and 6A in this manner. As a result, the additional mass 4 is displaced relative to the building 1 without twisting. Therefore, there is no fear that torsional vibration is exerted on the building 1.

The above control can be applied to any actuators arranged in parallel regardless of the driving direction of the additional mass.

[0022]

As described above, according to the present invention, the vibration damping command signal is corrected so that the difference in the stroke distance of the actuator for driving the additional mass is eliminated. Even if the load is not uniform, the actuator will expand and contract equally. For this reason, it is possible to prevent a disadvantage that the use of a plurality of actuators causes a torsional vibration in a building, in which the torsion phenomenon of the additional mass occurs.

[Brief description of the drawings]

FIG. 1 is a diagram of a vibration damping device showing an embodiment of the present invention.

FIG. 2 is a block diagram illustrating a configuration of a torsion compensation circuit.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Building 4 Additional mass 5, 6 Actuator 5A, 6A Displacement sensor 7, 8 Adder 13, 16 Vibration suppression command circuit 14, 17 Twist compensation circuit

Continuation of the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) E04H 9/02 341 F16F 15/02

Claims (1)

(57) [Claims] A plurality of actuators that stroke in the same direction in response to an input vibration suppression command signal; an additional mass supported by the building via these actuators; In a vibration damping device for a building having a means for outputting a vibration command signal, a difference between a means for detecting a stroke distance of each actuator and a stroke distance detected by a detecting means is calculated, and the calculated difference is eliminated. Means for correcting the vibration suppression command signal for each actuator as described above.