JPH01275867A - Vibration control method for building - Google Patents

Abstract

PURPOSE:To make it possible to control buildings' complex vibration and to improve vibration control effect, by installing a plurality of active type vibration control devices which control weights, capable of making relative movement against the building in accordance with vibration of the building, and by realizing simultaneous control by a plurality of vibration control devices. CONSTITUTION:One of the methods proposed by this description is that a vibration control device AMD1 which controls vibrations in the X direction and vibration control device AMD2 which controls vibrations in the Y direction are arranged so that they are placed at right angles each other. Sensors S1-S4 made of accelerometers are arranged at weights 2 and a building body 1. Detected signals are transmitted to a control device, and levels of the signals at synthesization with amplified response signals of the weight 2 is controlled by an automatic gain control circuit. One of the methods to control vibration is that with reaction taken at the building 1, control force is applied to the building 1 through the weight 2 and, at the same time, simultaneous control by a plurality of vibration control devices is applied. By the above-mentioned methods, complex vibration of the building can be controlled and vibration control effect can be improved, too.

Description

[Detailed Description of the Invention] [Field of Industrial Application] This invention relates to a method of damping vibrations in a building using an active damping device to reduce vibrations generated in the building due to external forces such as earthquakes and wind. .

[Conventional technology]

The applicant is JP-A-62-268478 and JP-A-63
- In Publication No. 78974, etc., a vibration control device consisting of an additional mass and an actuator is installed at the top of a building, etc., and when the building receives an external force such as an earthquake or wind, by controlling the operation of the actuator, the weight as an additional mass is installed. This disclosure discloses an active vibration damping device that takes a reaction force and applies a force to the building body to control the vibration.

Figure 4 shows an outline of an active vibration damping system. For example, a weight 2 is provided as an additional mass on the top of a building 1, substantially separate from the building 1, and the weight 2 and the building 1 are combined. A hydraulic cylinder as an actuator 3 is interposed between the actuator and the actuator. When vibrations occur in the building 1 due to earthquakes, wind, etc., the sensor 4a installed in the building 1 senses the vibrations, sends a signal to the control circuit, and sends an output signal corresponding to the vibration of the building 1 to the actuator 3. The signal is sent to the connected servo valve to control the actuator 3. Note that by providing a sensor 4b also on the actuator 3 side, the movement of the actuator 3 can be controlled by feeding back. In addition, although the above is closed-loop control, it is also possible to predict the response of the building by analyzing seismic waves sent from wide-area and narrow-area seismometers, and combine it with loop control during control.

[Problem to be solved by the invention]

By the way, when a hydraulic cylinder or the like is used as the actuator 3, the direction of control is limited, so even if vibrations in one direction of the building can be suppressed, vibrations in the other direction cannot be suppressed.

Also, depending on the design of the building, relatively large effects can often be obtained even with control in only one direction, but external forces such as earthquakes and wind are uncertain external forces, and in eccentric buildings, etc.
By suppressing torsional vibration components, more effective control becomes possible.

Furthermore, since secondary vibration components may become large in high-rise or super-high-rise buildings, the restraining effect can be improved by suppressing the secondary vibration components.

This invention aims to solve the above-mentioned problems in a method of damping a building using an active damping device.

[Means to solve the problem]

The active vibration control device used in this invention is basically to output a control force proportional to the vibration speed of the building, and the signal from the vibration detection means installed in the building is amplified by an amplifier circuit, and the output control signal is used to By controlling the actuator and applying a control force to the building by applying a reaction force to the weight, it is possible to suppress vibrations in the building.

In this invention, a plurality of the above-mentioned vibration damping devices are provided in a building to be controlled, and complex vibrations of the building are controlled by simultaneously controlling the plurality of vibration damping devices. A plurality of these vibration damping devices can share one hydraulic power source, thereby simplifying the equipment.

Specifically, by using two vibration damping devices to perform control in directions orthogonal to each other, it is possible to perform control according to the planar shape of the building (see Figure 1).

In addition, if the main purpose is to control vibration in a specific direction, the main vibration damping device should be installed at the center of the plane of the building, and the auxiliary vibration damping device should be installed at the edge of the building in the same direction as the main vibration damping device. By doing so, it is possible to control the torsional vibration component of the building with an auxiliary vibration damping device (see Figure 2).

In addition, for high-rise buildings or super high-rise buildings, in addition to the main vibration damping device installed at the top of the building, an auxiliary vibration damping device is installed on the floor that is the antinode in the secondary vibration mode, and both By controlling these simultaneously, the secondary vibration components of the building can be controlled by an auxiliary vibration damping device (see Figure 3).

〔Example〕

Next, specific examples will be described.

In Figure 1, two vibration damping devices are installed at the top of a building in orthogonal directions to control the building in two directions, X and Y. In the figure, the X-direction vibration damping device is AMDI (
AMD stands for Active Mass Driver)
, the vibration damping device in the Y2 direction is AMD2. By controlling two orthogonal vibration control devices, vibrations in all directions can be controlled.

Note that S1 to S4 in the figure indicate the arrangement of accelerometers as vibration detection means.

In the embodiment shown in Figure 2, two vibration control devices are installed in the same direction at the center and end of the top of the building, and the main vibration control device (in the figure) is installed in the same direction.
AMD I) performs main control, and an auxiliary vibration damping device (AMD2 in the figure) at the end controls torsional vibration components.

Figure 3 shows a high-rise building where the primary vibration component is controlled by a damping device (AMD 1' in the figure) at the top of the building, and the secondary vibration component is installed on the floor corresponding to the antinode position of the secondary vibration mode. It is controlled by a vibration damping device (AMD2 in the figure).

Fig. 5 is a conceptual diagram of the signal hydraulic system of the active damping device. Accelerometers (31, S2) are installed as sensors in the weight of the damping device (AMD) and the building, respectively, and response signals are generated as control signals. sending it to the circuit.

After phase adjustment and amplification are performed by the control signal generation circuit as described later, the control signal is sent to the comparison circuit. On the other hand, an output signal is also sent from the sensor S1 that detects the movement of the weight to the comparison circuit, thereby performing feedback control.

The control signal passed through the comparison circuit is sent to the hydraulic servo valve attached to the hydraulic cylinder, and the hydraulic servo valve is controlled. The hydraulic system constitutes a circulation path consisting of a hydraulic tank, a hydraulic pump, a hydraulic servo valve, and a hydraulic cylinder, and an accumulator is provided between the hydraulic pump and the hydraulic servo valve.

A hydraulic cylinder is operated under the control of a hydraulic servo valve, which takes a reaction force to the building and applies force to the weight of the vibration damping device to suppress the vibrations of the building.

Figure 6 shows the embodiment of Figure 2, that is, the main vibration damping device (
In addition to AMDI), an auxiliary vibration damping device (AMDI) is installed at the end of the building.
D2) is installed and an auxiliary damping device is used to control torsional vibration components.

In Figure 6, input 1 is the acceleration of the weight of the main vibration control device installed at the center of the top of the building, which is sensed by sensor Sl (see Figure 2), and input 2 and input 4 are the acceleration of the weight of the main vibration control device installed at the center of the top of the building, which is sensed by sensor S2. The acceleration at the center of the top, input 3, is the acceleration of the weight of the auxiliary damping device installed at the top end of the building, which is sensed by sensor S3, and input 5 is the acceleration at the top end of the building, which is sensed by sensor S4.

Input 1 is passed through a low-pass filter to remove minute vibration components and noise, amplified, and then sent to the phase adjuster via an integrating circuit or directly. Input 1 is acceleration, which is 90' out of phase with velocity, but since mechanical parts such as hydraulic cylinders have mechanical delays due to friction and other factors, the phase is adjusted by 90° using an integral circuit as necessary. Adjustment is performed in the range of 0 to 90° using a phase adjuster. The signal level is then adjusted by an amplifier.

Similarly, the input 2 has minute vibration components and noise removed, the phase is adjusted, and then the signal level is brought to a preset level by passing through an automatic gain adjustment circuit. Note that the control signal is 90° out of phase with the vibration of the building.

Input 1 and input 2 are combined through parallel amplifier circuits as described above.

The vibration of the weight of a seismic damping device must be within the capacity of the device, and there is a limit to its amplitude, whereas the vibration of the building side varies depending on the scale of the earthquake, ranging from small accelerations to large accelerations. There are even things. Therefore, an automatic gain adjustment circuit is installed on the building side, but when the acceleration on the building side is small, the amplification factor in the building side circuit increases, and as the acceleration on the building side increases, the amplification factor in the building side circuit increases. becomes smaller. As a result, when the acceleration on the building side is small, control is performed that is 90° out of phase with the vibration of the building, whereas when the acceleration on the building side is large, control approaches the movement of the weight, and the control is performed on the building side. Since the acceleration is large, the control is performed almost in sync with the vibration of the building, that is, the hydraulic cylinder does not operate, and the weight appears to be stationary relative to the building. When the acceleration on the building side decreases, the amplification factor in the circuit on the building side increases again, making it possible to accelerate vibration damping of the building.

In addition, the composite signal synthesized through parallel amplifier circuits is
Furthermore, by passing through a gain adjustment circuit, the signal is output at a preset level, and the movement of the weight is controlled within the capability of the vibration damping device.

Input 3 is the acceleration of the weight of the auxiliary damping device, and is adjusted by the same amplifier circuit as input 1 above.

Input 4 and human power 5 are the accelerations at the center of the building and at the edges of the building, respectively. After passing through a low-pass filter and a buffer amplifier, the difference is taken by a synthesis amplifier, and the same adjustment operation as input 2 above is applied to the torsional vibration component. is combined with the input 3 signal that has passed through the amplifier circuit, and then passes through the automatic gain adjustment circuit.
A control signal for the weight of the auxiliary damping device is output.

In this embodiment, an automatic gain adjustment circuit is provided in the amplifier circuit for amplifying the response signal from the building side, so that the level of the signal when combined with the amplified response signal from the weight side is adjusted. Therefore, in a range where the vibration of the building is not so large, the amplification factor of the response signal on the building side is large, so that control is performed in accordance with the vibration of the building. And the vibration of the building is strong (
As the weight increases, the amplification factor of the response signal from the building side decreases, and the contribution rate of the movement of the weight side to the control increases. In this state, the vibration of the building is large, but since the vibration damping device is controlling within a certain range of capability, the vibration of the weight gradually approaches the vibration of the building, and the control is also controlled to bring it closer to the vibration of the building. Become. As a result, during times of strong shaking, the weight moves almost integrally with the building (staying stationary relative to the building), and the safety of the device is maintained without receiving large forces from the building.

When the earthquake, etc. subsides and the vibration of the building becomes smaller, the amplification factor of the response signal on the building side increases again due to the action of the automatic gain adjustment circuit, giving vibration in the opposite direction to the vibration of the building and damping the vibration. Control can be performed to speed up the process.

Furthermore, as for the output of the composite signal, the output level of the composite signal is further adjusted by an automatic gain adjustment circuit, so that the vibration control device does not operate excessively even in response to excessive vibrations of the building. In other words, if the vibration of the building exceeds the ability of the vibration damping device, it will be controlled within the range of the vibration damping device's ability, and if the vibration is even larger, the vibration of the building will be controlled by bringing the movement of the weight closer to the movement of the building. safety can be ensured.

Regarding the embodiment shown in FIG. 1 and the embodiment shown in FIG. 3, two control circuits for the vibration damping device (AMDI) in the center of the building shown in FIG. 6 described above may be provided and controlled separately.

[Effects of the Invention] In the present invention, since a plurality of active damping devices are controlled simultaneously to suppress vibrations in a building, various types of control such as those described below can be easily performed.

■ Bidirectional control is possible by using two damping devices in orthogonal directions.

■ One main damping device controls horizontal vibration, and the other
By suppressing torsional vibration with an auxiliary vibration damping device on the base, it can be applied to eccentric buildings.

■ By installing it on the intermediate floor of a building, it is possible to simultaneously control the primary and secondary vibration components together with the main vibration control device at the top of the building.

■ Combinations of the above ■ to ■ are also possible.

[Brief explanation of the drawing]

Figures 1 to 3 show examples of the arrangement of vibration damping devices in different embodiments. Figures 1 and 2 are plan views, Figure 3 is an elevation view, and Figure 4 is an active type vibration damping device. An explanatory diagram showing an overview of the vibration damping system, Figure 5 is a conceptual diagram of the signal hydraulic system of the active vibration damping system, and Figure 6 shows an example of the signal generation circuit of the active vibration damping system in the embodiment shown in Figure 2. FIG. 1...Building body, 2...Weight, 3...Hydraulic cylinder, 4a, 4b...Sensor Figure 1 Figure 3 Figure 2 Figure 4 Figure 1

Claims (5)

[Claims] (1) Active type consisting of a weight that is movable relative to the building, an actuator interposed between the weight and the building, and a control circuit that generates a control signal to control the actuator in response to vibrations of the building. Install multiple vibration control devices,
A method for damping vibrations in a building, characterized by controlling vibrations in the building by controlling multiple vibration damping devices simultaneously. (2) The method of damping vibrations in a building according to claim 1, characterized in that two vibration damping devices are arranged in directions whose actuators are perpendicular to each other, and control is performed in directions perpendicular to each other. (3) The method for damping vibrations in a building according to claim 2, wherein the actuators of the two vibration damping devices are driven by one common hydraulic power source. (4) The vibration damping device consists of two devices, a main vibration damping device and an auxiliary vibration damping device.The main vibration damping device is installed in the center of the plane of the building, and the auxiliary vibration damping device is installed at the edge of the plane of the building. Install it in the same direction as
Claim 1 characterized in that the torsional vibration component of the building relative to the control direction of the main vibration damping device is controlled by the auxiliary vibration damping device.
Seismic control methods for the listed buildings. (5) The vibration control device consists of two devices, a main vibration control device and an auxiliary vibration control device.The main vibration control device is installed at the top of the building, the auxiliary vibration control device is installed on the middle floor of the building, and the secondary vibration control device 2. The method of damping vibrations in a building according to claim 1, wherein the vibration components are controlled by an auxiliary vibration damping device.