JPH10227149A - Installation method for piezoelectric actuator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To decrease the number of piezoelectric actuators and obtain damping performance by making the number of piezoelectric actuators arranged at the outer edge section of a column that faces the outside of a building in the control direction of the building larger than that of those arranged at the inner edge section of the column that faces the inside of the building. SOLUTION: Axial force and bending moment control is carried out in each column member and piezoelectric actuators are installed only at the outer edge section of a column. Therefore, even if same phase or opposite phase control voltage is applied to both inner edge and outer edge, piezoelectric actuator count components that contribute to control will increase. In addition, of given piezoelectric actuators, the number of piezoelectric actuators which permit to obtain the best damping performance and realize the same damping performance is minimized. Therefore, the number of piezoelectric actuators installed is cut while maintaining damping performance. Therefore, labor needed for installing piezoelectric actuators can be reduced, and load of a piezoelectric actuator controller can be lowered.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of installing a piezoelectric actuator which is installed on a pillar constituting a building and is controlled so that deformation of the building due to external force is reduced.

[0002]

2. Description of the Related Art When a frame responds or deforms due to an external force,
The column members constituting the frame are deformed according to the deformation of the frame.
Conventionally, in order to suppress such deformation of the frame, a piezoelectric actuator that expands and contracts in accordance with an input voltage is embedded at an end of a column member of the frame, and the piezoelectric actuator is configured to reduce the detected deformation amount of the frame. There has been proposed a vibration damping technique for controlling an input voltage of a semiconductor device.

[0003] By the way, in the conventional vibration suppression technology (Summary of 1996 Annual Conference of the Architectural Institute of Japan, 21468, "Study on Active Vibration Control of Smart Structure Using Solid Actuator", Kotaro Toyama et al.), FIG. As shown in
The piezoelectric actuator is embedded in the four corners of the pillar member.
By expanding and contracting the four piezoelectric actuators for each column member, deformation of the column members is suppressed, and the response of the entire frame is reduced.

In this vibration damping technique, as shown in FIG. 8 (b), two piezoelectric actuators at the inner edge and two piezoelectric actuators at the outer edge are cooperated with each other to expand and contract in opposite directions. And the bending moment of the column member is controlled. When controlling the axial force along the axial direction of the column member, two piezoelectric actuators on the inner edge and two piezoelectric actuators on the outer edge are simultaneously expanded and contracted in the same direction.

[0005]

However, according to the above-mentioned prior art, since either the bending moment control or the axial force control is performed separately for each column member constituting the frame,
It is necessary to embed the piezoelectric actuators in all four corners of one column member in a symmetrical arrangement, and there is a problem that the number of piezoelectric actuators to be installed increases.

[0006] For this reason, a large amount of labor is required for installing a large number of piezoelectric actuators on each column in a symmetrical arrangement, and a large load is applied to a control system for simultaneously controlling a large number of piezoelectric actuators.

Therefore, in order to solve the above-mentioned problem with the conventional installation method, a method of reducing the number of columns by reducing the number of column members on which the piezoelectric actuators are installed may be considered. However, in this method, the control force for suppressing the deformation of the entire frame is insufficient, and there is a possibility that the vibration damping performance is reduced.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-described circumstances, and has as its object to provide a method of installing a piezoelectric actuator which can reduce the number of piezoelectric actuators to be installed without deteriorating vibration damping performance. I do.

[0009]

[Means for Solving the Problems]

(Structure of the present invention) In order to achieve the above object, a first aspect is provided.
The invention relates to a method of installing a piezoelectric actuator which is installed on a pillar constituting a building and which is controlled so that an axial force and a bending moment for reducing deformation in a control direction of the building act on each pillar. In the above, the number of piezoelectric actuators installed on the outer edge of the pillar facing the outside of the building in the control direction is larger than the number of piezoelectric actuators installed on the inner edge of the pillar facing the inside of the building in the control direction. It is characterized by having done.

A second aspect of the present invention is characterized in that, in the first aspect of the present invention, no piezoelectric actuator is provided on the inner edge portion, and a piezoelectric actuator is provided only on the outer edge portion. (Principle of the present invention) Generally, it can be considered that the deformation of a frame is a combination of bending deformation and shear deformation. At this time, a deformation due to an axial force acting in the axial direction of the column and a deformation due to a shear force generated in a shear plane perpendicular to the axis occur simultaneously in each of the column members constituting the frame.

Therefore, in order to suppress the deformation due to the axial force and the shear force acting on each column member at the same time, it is assumed that the entire frame is damped by controlling the axial force and the bending moment for each column member. The optimum arrangement in the case where n piezoelectric actuators are attached to one column member end will be considered with reference to FIGS.

As shown in FIG. 2A, it is assumed that a number of piezoelectric actuators are installed at the outer edge of the column and (na) number of piezoelectric actuators are installed at the inner edge of the column, and control of all n piezoelectric actuators is performed simultaneously. I do. Note that the inner edge is a column end facing the inside of the frame in the control direction (the direction of the control force given to the frame to suppress deformation), and the outer edge is a column end facing the outside of the frame in the control direction. Part.

Here, the number of installed piezoelectric actuators will be considered by decomposing them into a number component contributing to axial force control and a number component contributing to bending moment control.

In the case of axial force control, since a force is generated in the axial direction, the magnitudes and signs of the number components of the inner edge and the outer edge are equal. That is, if this number component is x, FIG.
As shown in (b), the actuator having the number component x at both the inner edge and the outer edge contributes to the axial force control.

In the bending moment control, since a bending moment is generated, a difference in the force generated by the actuator between the inner edge and the outer edge becomes a problem, and the number components contributing to the bending moment between the inner edge and the outer edge are equal in magnitude. And the signs are reversed. That is, if this number component is y,
As shown in FIG. 2B, an actuator having a number component whose inner edge is −y and whose outer edge is y contributes to bending moment control.

Therefore, when the same control voltage is applied to the inner and outer edge actuators, the number of inner edge actuators is (x−y) and the number of outer edge actuators is (x + y). And the number of inner edge actuator installations (na) as a precondition
When the number of the actuators and the number of actuators at the outer edge are applied, the following simultaneous equations are established.

Xy = n-ax + y = a (1) When the equation (1) is solved, x = n / 2 and y = (2a-n) / 2. That is, as shown in FIG. 1 (a), when a control voltage having the same phase is applied to both sides, n / 2 sets are used in the axial force control.
The bending moment control is equivalent to the arrangement of (2a-n) / 2 sets of piezoelectric actuators. In the case of in-phase bending moment control, the equivalent number of piezoelectric actuators (2a-
Since n) / 2 increases as a increases, it can be seen that the vibration suppression performance improves as a increases.

When the control voltages of opposite phases are applied to the inner and outer edge actuators, respectively, the sign of the number component on either side is inverted so that the number of the inner edge actuators is (-x + y), The number of outer edge actuators installed can be expressed as (x + y). When the number of installed actuators at the inner edge (na) and the number of installed actuators at the outer edge a, which are prerequisites, are applied to the number of installations thus expressed, the following simultaneous equations are established.

−x + y = n−ax + y = a (2) When the equation (2) is solved, x = (2a−n) / 2 and y = n / 2. That is, as shown in FIG. 1B, when the control voltages having opposite phases are applied to both sides, the axial force control requires (2a-
In the case of n) / 2 sets of bending moment control, the arrangement is equivalent to n / 2 sets of piezoelectric actuators. In the case of antiphase axial force control, the equivalent number of piezoelectric actuators (2a-n) / 2
Since a increases as a increases, it can be seen that the vibration suppression performance improves as the a increases.

As described above, in both cases of in-phase and out-of-phase control voltages, the larger the number a of the outer edges installed, the more the actuator contributes to the control of the axial force control and the bending moment control. It can be seen that the equivalent arrangement increases, and the larger the value of a, the more effective the arrangement.

The number of actuators at the outer edge a
Is equal to the upper limit value n (a = n), that is, it is understood that the most efficient arrangement is to concentrate the piezoelectric actuators on the outer edge of the column member end. When a vibration damping device having the same capacity is configured, the number of actuators can be reduced by arranging the piezoelectric actuators concentrated on the outer edge of the column member end.

(Operation of the Present Invention) When an external force acts on a building, the building undergoes a coupled deformation of a bending deformation and a shearing deformation, and each column constituting the building is deformed by an axial force. And deformation due to shear force occur simultaneously. At this time,
According to the first aspect of the present invention, the piezoelectric actuator is controlled so that the axial force and the bending moment for reducing the deformation of the building in the control direction act on each column. Here, as the control direction, a direction in which the building is easily deformed, for example, a horizontal 1
Direction or two horizontal directions. When there are two or more control directions, a piezoelectric actuator can be prepared for each control direction.

As described above, according to the present invention, the control of the axial force and the control of the bending moment are simultaneously performed, and the number of the piezoelectric actuators installed on the outer edge of the column facing the outside of the building in the control direction is determined by the control direction. Because the number of piezoelectric actuators installed on the inner edge of the column facing inward was larger than the number of piezoelectric actuators installed on the inner edge of the pillar, the piezoelectric actuator was not symmetrically installed on the outer edge and the inner edge based on the principle of the present invention. Even if the number of actuators is reduced, effective vibration suppression becomes possible.

According to the second aspect of the present invention, no piezoelectric actuator is provided on the inner edge portion, and a piezoelectric actuator is provided only on the outer edge portion. The highest vibration damping performance among the number of actuators installed is obtained. That is, when the same vibration suppression performance is realized, the number of piezoelectric actuators can be minimized.

[0025]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 3 shows a three-dimensional frame 10 on which a piezoelectric actuator is installed by the method for installing a piezoelectric actuator according to the embodiment of the present invention. The three-dimensional frame 10 is modeled as a four-layer, one-span three-dimensional frame composed of four pillars 14 as shown in the three-dimensional frame elevation view and the three-dimensional frame plan view of FIG. The base of the first layer of each pillar 14 constituting the three-dimensional frame forms a mounting portion 12 for the piezoelectric actuator.

As shown in the elevation view of the piezoelectric actuator installation part in FIG. 1, the installation part 12 is a steel material 1 forming a pillar.
8 (for example, H-section steel) and 2
And a pair of arms 20. The piezoelectric actuator 16 is installed between the two pairs of arms 20 via a mounting jig 22. Note that only the horizontal short side direction of the three-dimensional frame is the control direction, and the elevation view of the installation part shows the elevation of the installation part 12 when viewed from the control direction.

As shown in the plan view of the conventional installation section in FIG.
In the conventional installation section 24, piezoelectric actuators are installed at four corners of a pillar end in a symmetrical arrangement. That is, FIG.
In the conventional three-dimensional frame model composed of four pillars, a total of 16 piezoelectric actuators are conventionally arranged (FIG. 6).
(B)). On the other hand, in the installation part 12 according to the embodiment of the present invention, as shown in the installation part plan view of the present invention in FIG. 1, the two corners of the outer edge of the pillar end with respect to the control direction of the three-dimensional frame. And the piezoelectric actuators 16 are arranged only in the. That is, in the embodiment of the present invention, a total of eight piezoelectric actuators are arranged in the three-dimensional frame model of FIG. 3 (see FIG. 6A).

FIG. 3 shows an example of a method of installing a piezoelectric actuator in a three-dimensional frame having four columns of 1.times.1 span and a control direction of one direction. An example of a method of installing the piezoelectric actuator will be described with reference to FIG.

FIG. 5A shows two horizontal directions (x
The method of installation when controlling the deformation in the (direction, y-direction) is different for each of a 2 × 2 span (9 pillars) building and a 3 × 3 span (16 pillars) building in the building plane. The case is shown. Here, the piezoelectric actuator for controlling the x direction is indicated by a black square, the piezoelectric actuator for controlling the y direction is indicated by a white circle, and the piezoelectric actuator for controlling any of the x and y directions is indicated by a black circle. ing.

As shown in FIG. 5 (a), in both the 2 × 2 span and the 3 × 3 span buildings, the piezoelectric actuator is installed only on the pillar having a surface that comes into contact with the outside of the building, and For a column whose surface in contact with the exterior of the object is perpendicular to the y direction, two piezoelectric actuators (white circles) for y-direction control are installed only on the outer edge of the surface of the column, and the exterior is in contact with the exterior of the building. For a column whose surface is perpendicular to the x-direction, two piezoelectric actuators (black squares) for x-direction control are provided only on the outer edge of the column surface.

However, the pillars at the four corners of the building plane are:
Since there are two contact surfaces with the outside and each column surface is perpendicular to the x direction and the y direction, x
An actuator for directional control and an actuator for y-direction control are installed. Among them, a piezoelectric actuator (black circle) for controlling any one of the x and y directions is installed at an outer edge corresponding to the four corners of the building plane.
That is, a total of three piezoelectric actuators are installed on the pillars at the four corners of the building plane.

In the example shown in FIG. 5 (a), the piezoelectric actuator is installed only on the column having a surface that comes into contact with the outside of the building. However, when the number of spans is large, the piezoelectric actuator is installed on the column inside the building. Alternatively, a piezoelectric actuator may be provided. In this case, the piezoelectric actuator is installed at the outer edge of one of the pillar surfaces (surface close to the outside of the building) facing the outside of the building among the pillar surfaces perpendicular to the control direction. However, if it is installed on the pillar in the center of the building, it will be installed on both sides.

Next, FIG. 5B shows an installation method for controlling the deformation of the building in one horizontal direction (y direction). The installation method is a 3 × 1 span (eight columns) building plane. And a 4 × 2 span (15 pillars) building. In this case, only the actuator (white circle) for y-direction control is used.

As shown in FIG. 5 (b), in both the 3 × 1 span and the 4 × 2 span buildings, only the columns whose surfaces in contact with the outside of the buildings are perpendicular to the y direction are provided. Two piezoelectric actuators (white circles) for y-direction control are installed on the outer edge of the column surface perpendicular to the y-direction.

In the example shown in FIG. 5B, the piezoelectric actuator for y-direction control is installed only on a column having a column surface that comes into contact with the outside of the building. The piezoelectric actuator may also be installed on a column inside the device. In this case, a piezoelectric actuator for y-direction control is installed at the outer edge of one of the pillar surfaces (surface close to the outside of the building) facing the outside of the building among the pillar surfaces perpendicular to the control direction. However, if it is installed on the pillar in the center of the building, it will be installed on both sides.

Next, the configuration of the vibration damping device according to the present embodiment will be described with reference to FIG. It is assumed that the piezoelectric actuator 16 is installed on each pillar member of the building 11 in FIG. 4 by the installation method shown in FIG. 3 or FIG. That is, as shown in FIG. 1C, this is a case of optimal installation in which the piezoelectric actuator is installed only at the outer edge of the column.

As shown in FIG. 4, a sensor 30 for detecting a physical quantity related to the amount of deformation of the building 11 that has been deformed and responded to by an external force is attached to the top of the building 11. The physical quantity detected by the sensor 30 includes, for example, acceleration in two horizontal directions (x, y). In this case, the sensor 30 uses the acceleration in the x and y directions at the top of the building as an analog signal. Output.

The output terminal of the sensor 30 is connected to a computer 32. The computer 30 controls the entire device based on a predetermined program, and an AD converter 34 that samples the input analog output signal of the sensor 30 at a predetermined cycle and converts it into a digital signal.
A microcomputer 38 for managing and calculating a control voltage signal to the piezoelectric actuator, a DA converter 40 for converting the calculated control voltage signal as digital data into an analog signal, and AD converters 34 and D
An input / output interface circuit 36 interposed between the A-converter 40 and the microcomputer 38 for controlling an interface of input / output data.

The microcomputer 38 calculates a control voltage signal to each piezoelectric actuator for reducing the amount of deformation of the building 11 detected from the output signal of the sensor 30 based on a predetermined control theory. Here, the microcomputer 38 simultaneously controls the axial force and the bending moment of each column member. In addition, as the predetermined control theory, a so-called model matching method, H
が あ る There is control theory. Further, both the output feedback method and the state feedback method can be applied. The control voltage signal thus calculated is supplied to the DA converter 40 via the input / output interface circuit 36.
And converted to an analog signal.

The DA converter 42 is connected to an amplifier 42 for amplifying a control voltage signal to each piezoelectric actuator, and each output terminal of the amplifier 34 is connected to each piezoelectric actuator 16 installed on the building 11. ing.

Next, the operation of the present embodiment will be described. When an external force acts on the building 11 of FIG.
A coupled deformation of the bending deformation and the shear deformation occurs. The sensor 30 detects a physical quantity related to the amount of deformation of the building and outputs the physical quantity to the computer 32. And the computer 32
Based on the above control theory, calculate the axial force and bending moment to be applied to each column member to reduce the deformation of each column member where the deformation due to the axial force and the deformation due to the shear force are simultaneously occurring, A control voltage signal to each piezoelectric actuator for generating the axial force and the bending moment is calculated and output.

After being amplified by the amplifier 42, the control voltage signal is supplied to each piezoelectric actuator 16, and each piezoelectric actuator 16 expands and contracts according to the supplied control voltage. Thereby, the axial force and the bending moment act on each column member, the deformation of each column member due to the axial force and the deformation due to the shear force are reduced, and the deformation of the whole building is reduced.

When the control direction is two directions as shown in FIG. 5A, the sensor 30 detects a physical quantity corresponding to the deformation amount in the x direction and the y direction, and the microcomputer 32
The piezoelectric actuator for x-direction control and the piezoelectric actuator for y-direction control are independently controlled so as to reduce the deformation in each direction.

As described above, in the present embodiment, the axial force control and the bending moment control are performed by each of the column members.
As shown in (c), the piezoelectric actuator is installed only on the outer edge of the column. Thus, as described above with reference to FIGS. 1A and 1B in the “principle of the present invention”, when the control voltage of either the same phase or the opposite phase is applied to both sides of the outer edge and the inner edge, Even if there is, the number component of the piezoelectric actuators contributing to the control increases, and the maximum damping performance can be obtained among the given number of the piezoelectric actuators. That is, when the same vibration suppression performance is realized, the number of piezoelectric actuators can be minimized.

For example, in the case of the three-dimensional frame 10 shown in FIG. 3, the number of piezoelectric actuators to be installed is 16 (FIG. 6).
Even if the number is reduced from eight (see FIG. 6B) to eight (see FIG. 6A), substantially the same vibration damping performance can be achieved.

The 2 × 2 span (post 9) shown in FIG.
Book), in the case of a 3 × 3 span (16 pillars) building, in a conventional installation method, when four piezoelectric actuators are respectively installed on a pillar having a surface that comes into contact with the outside, a total of 32 piezoelectric actuators are respectively provided. Forty-eight piezoelectric actuators are required. On the other hand, in the installation method of the present embodiment, as shown in FIG. 5A, almost the same piezoelectric actuators are installed only by installing 20 piezoelectric actuators in 2 × 2 span and 28 piezoelectric actuators in 3 × 3 span. Vibration suppression performance can be obtained, and reduction of 12 and 20 piezoelectric actuators can be achieved.

Further, the 3 × 1 span (column 8) shown in FIG.
In the case of a building having 4 × 2 spans (15 pillars), in the conventional installation method, when four piezoelectric actuators are respectively installed on pillars on which actuators are to be installed, a total of 32 piezoelectric actuators and 40 piezoelectric actuators are respectively provided. Piezoelectric actuator is required. On the other hand, in the installation method of the present embodiment, FIG.
As shown in (b), 16 3 × 1 spans, 4 × 2
By installing only 20 piezoelectric actuators in a span, almost the same vibration damping performance can be obtained, and reduction of 16 and 20 piezoelectric actuators can be achieved.

As described above, in the present embodiment, the number of piezoelectric actuators to be installed can be reduced without lowering the vibration damping performance, so that the labor for installing the piezoelectric actuators can be reduced and the load on the controller of the piezoelectric actuators can be reduced. Can be reduced.

Although the embodiment of the present invention has been described above, it is needless to say that the present invention is not limited to the above-described example, and various changes can be made without departing from the gist of the present invention.

For example, in this embodiment, an example has been described in which two piezoelectric actuators are installed on the outer edge of one pillar.
One or three or more piezoelectric actuators may be installed on the outer edge according to the column member. When three or more piezoelectric actuators are provided on the outer edge, the arrangement of those piezoelectric actuators can be changed as appropriate.

Further, the present invention is not limited to the example of installation on a building having a span shown in FIGS. 3 and 5, and can be applied to any building having a plurality of columns.

Further, the example in which the piezoelectric actuator is installed at the base of the column member of the first layer (first floor) of the three-dimensional frame has been described. However, the piezoelectric actuator is installed at the base of the column member of the second layer (second floor). The present invention can also be applied to a case where vibration is damped using the piezoelectric actuator of each layer.

[0054]

EXAMPLE Next, a vibration experiment was conducted to vibrate a three-dimensional frame on which a piezoelectric actuator was mounted according to the mounting method according to the above-described embodiment, and the results of vibration suppression of the vibrated frame were used to implement the present invention. This will be described below as an example.

In this excitation experiment, a three-dimensional frame (see FIG. 3) having a weight of about 500 kg per layer in four 1 × 1 spans was used as a building model, and a uniform power spectrum was obtained over a wide frequency range. This three-dimensional frame was placed on a vibrating table capable of vibrating in one direction (excitation direction) with a broadband random wave having the following. In this three-dimensional frame, as shown in FIG.
According to the installation method according to the present invention, two piezoelectric actuators were installed only on the outer edge in the vibration direction (control direction) per column, that is, a total of eight piezoelectric actuators. Then, control for suppressing the vibration of the vibrated three-dimensional frame at the primary natural frequency was performed using a vibration damping device (see FIG. 4) connected to the piezoelectric actuator.

The vibration damping device according to the present embodiment controls the piezoelectric actuator and detects the acceleration in the vibration direction (sensor 3 in FIG. 4) installed at the top of the three-dimensional frame.
0), an amplitude value for each frequency of frame vibration at the top of the frame is calculated based on the output signal, and the amplitude value is divided by the amplitude value of the shaking table (foundation) to obtain an amplification factor for each frequency. It is calculated and output as the vibration suppression result. The amplification factor indicates a transfer function of a building (three-dimensional frame), and indicates that the smaller the amplification factor, the more the deformation and vibration of the building are suppressed.

For comparison, in this vibration experiment, FIG.
As shown in (b), in accordance with the conventional installation method, four piezoelectric actuators were symmetrically installed on each pillar at both the inner edge and the outer edge in the vibration direction (control direction) (a total of 16 piezoelectric actuators). The damping result in the case and the result in the case of not damping by the damping device were obtained.

The results of the above vibration experiment will be described with reference to the respective graphs shown in FIG. In the graph of FIG. 7, the horizontal axis represents the frequency (0 to 100 Hz), and the vertical axis represents the amplification factor (0 to 100 Hz).
50 times).

FIG. 7A shows the results of a vibration experiment in the case where vibration was not damped by the vibration damping device. As shown in the figure, the amplification factor is rapidly increased to a peak value at a building model of the primary natural frequency f ₁ (about 50). When the frequency shifts from the peak position to the higher frequency side, the amplification factor sharply decreases. However, the amplification factor sharply increases again at the secondary natural frequency f ₂ of the building model,
The peak is smaller than the primary natural vibration. Then, it falls again at a higher frequency. That is, the vibration caused by wideband random waves, building model, it can be seen that the deformation and vibration mainly in the frequency f _1.

FIG. 7B shows a result obtained by installing a piezoelectric actuator and damping the vibration by the installation method according to the present embodiment. Note that this result indicates that each of the eight piezoelectric actuators was controlled by an axial force control and a bending moment control.
It is a vibration suppression result in a case where control is performed so as to reduce only the next natural vibration. As shown in the figure, it can be seen that the peak value of the amplification factor of the primary natural vibration is about 6, which is much smaller than the peak value of about 50 when no vibration is damped.

For comparison, FIG. 7C shows the result of damping vibration by installing 16 piezoelectric actuators by the conventional installation method. This result is a damping result obtained when only the axial natural force control of the 16 piezoelectric actuators is performed to control only the primary natural vibration. As shown in the figure, it can be seen that the peak value of the amplification factor of the primary natural vibration is about 6, which is much smaller than the peak value of about 50 when no vibration is damped.

FIG. 7D shows the result of damping vibration by installing 16 piezoelectric actuators by a conventional installation method. This result is a vibration damping result obtained when only the bending moment control of the 16 piezoelectric actuators is performed to control only the primary natural vibration. As shown in the figure, it can be seen that the peak value of the amplification factor of the primary natural vibration is about 6, which is much smaller than the peak value of about 50 when no vibration is damped.

As described above, in this embodiment, the same vibration damping result was obtained even when the number of piezoelectric actuators to be installed was reduced from 16 to 8 in the related art. That is, the effect of the present invention that the number of piezoelectric actuators can be reduced without lowering the vibration suppression performance was confirmed.

Although the present embodiment deals with the vibration suppression for reducing only the primary natural vibration, the present invention is also applicable to the case where the control for simultaneously reducing the primary natural vibration and the secondary natural vibration is performed by the vibration damping device. It goes without saying that the effects of the invention can be maintained.
Such control is performed by calculating a control voltage for reducing the primary natural vibration and a control voltage for reducing the secondary natural control voltage, and inputting a control voltage as a result of adding each control voltage to the piezoelectric actuator. realizable.

[0065]

As described above, according to the first aspect of the present invention, the control of the axial force and the control of the bending moment are simultaneously performed, and the piezoelectric element installed at the outer edge of the column facing the outside of the building in the control direction. Since the number of actuators is larger than the number of piezoelectric actuators installed on the inner edge of the column facing the inside of the building in the control direction, the number of installed piezoelectric actuators can be reduced without lowering the vibration control performance. Is obtained.

Further, according to the second aspect of the present invention, no piezoelectric actuator is provided on the inner edge portion, and the piezoelectric actuator is provided only on the outer edge portion. A further effect is obtained that vibration performance can be obtained and the number of piezoelectric actuators to be installed can be minimized without lowering the vibration suppression performance.

[Brief description of the drawings]

FIG. 1 is a diagram for explaining the principle of the present invention,
(A) is a number component of the inner and outer edges of the piezoelectric actuator that contributes to axial force control and bending moment control when the same phase control voltage is applied to both sides of the inner and outer edges of the column member. Number components of the inner edge and outer edge of the piezoelectric actuator that contribute to axial force control and bending moment control when opposite-phase control voltages are applied to both sides,
(C) is a figure which each shows the optimal arrangement | positioning of a piezoelectric actuator.

FIG. 2 is a diagram for illustrating the principle of the present invention, in which (a)
FIG. 3 is a diagram showing the number of piezoelectric actuators installed on the inner and outer edges of the column member, and FIG. 2 (b) is a diagram for explaining the results of FIG.

FIG. 3 is an elevation view of a three-dimensional frame according to the embodiment of the present invention;
FIG. 3 is a plan view, an elevation view of a portion where the piezoelectric actuator is installed in the three-dimensional frame, and a plan view.

FIG. 4 is a diagram showing a structure in which a piezoelectric actuator is installed by the installation method according to the embodiment of the present invention, and a configuration of a vibration damping device that controls the piezoelectric actuator.

5A and 5B are diagrams illustrating an example of installation of a piezoelectric actuator according to an embodiment of the present invention, wherein FIG.
FIG. 3B is a diagram illustrating an example of installation in the case of two-way control, and FIG.

6A and 6B are schematic diagrams illustrating a case where a piezoelectric actuator is installed on a three-dimensional frame according to an embodiment of the present invention. FIG. 6A illustrates a case where a piezoelectric actuator is installed by the installation method according to the embodiment of the present invention. () Is a schematic diagram when a piezoelectric actuator is installed by a conventional installation method.

FIGS. 7A and 7B are diagrams showing the results of a vibration experiment according to an example of the present invention in terms of the amplification factor for each frequency, where FIG. 7A shows the result when vibration suppression is not performed, and FIG. (C) Vibration damping results obtained when only the axial force control was performed by the conventional installation method, and (d) vibration results obtained when only the bending moment control was performed by the conventional installation method. It is a figure which shows each damping result.

FIG. 8 is a diagram for explaining the prior art, in which (a)
Is a diagram showing how to install a conventional piezoelectric actuator,
(B) is a diagram for explaining bending moment control by a piezoelectric actuator installed by a conventional installation method.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Three-dimensional frame (building) 12 Installation part of piezoelectric actuator 14 Column member 16 Piezoelectric actuator 30 Sensor 32 Computer 42 Amplifier

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Nobuyoshi Murai 1-5-1, Otsuka, Inzai City, Chiba Prefecture Inside the Technical Research Institute, Takenaka Corporation (72) Inventor Satoru Satoru Aizawa 1-5-1, Otsuka, Inzai City, Chiba Prefecture (72) Inventor Takashi Fujita 575-28 Nakano Hisagi, Nagareyama City, Chiba Prefecture (72) Inventor Takayoshi Kamata 1-6-6-102, Shukugawara, Tama-ku, Kawasaki City, Kanagawa Prefecture (72) Invention Person Takayoshi Hatayama 63-30 Yuigaoka, Hiratsuka-shi, Kanagawa Sumitomo Heavy Industries, Ltd. (72) Inventor Takeo Arikabe 63-30 Yuyogaoka, Hiratsuka-shi, Kanagawa Sumitomo Heavy Industries, Ltd.

Claims (2)

[Claims] 1. A piezoelectric actuator installed on a pillar constituting a building and controlled to apply an axial force and a bending moment to each pillar to reduce deformation in a control direction of the building. The method, wherein the number of piezoelectric actuators installed on the outer edge of the pillar facing the outside of the building in the control direction is the number of piezoelectric actuators installed on the inner edge of the pillar facing the inside of the building in the control direction. A method of installing a piezoelectric actuator, wherein the number is greater than the number. 2. The method according to claim 1, wherein a piezoelectric actuator is not provided at the inner edge portion, and a piezoelectric actuator is provided only at the outer edge portion.