JPH02285177A - Vibration controlling method and vibration controller tower-like construction - Google Patents

Abstract

PURPOSE:To control easily the vibration of a tower, etc., by rotating a plurality of rotating bodies separately at the periphery of the upper part of a tower-like construction, and controlling the composition of forces of rotation so as to make the same period and the reverse direction with the motion of the tower-like construction caused by wind. CONSTITUTION:Hollow ring shaped housing bodies 3 and 3 are supported to the periphery of the upper part of a tower-like construction 1 by supporting members 2. After that, traveling trucks 5 and 6 as rotating bodies are interlocked with a rail 4 constructed inside the housing body 3 so that they are capable of making periodic rotation more than two. Then, a sensor 7 measuring the motion which occurs in the construction 1 by external force and a controller controlling the running of the trucks 5 and 6 based on the result of measuring are provided. The rotational period of the trucks 5 and 6 is controlled as same as the vibration period of the construction 1 and, at the same time, the direction of rotation and the phase are controlled to influence the composition of forces of rotation to the reverse direction to the moving direction of the construction 1. According to the constitution, even in a tower, etc., having no sufficient space, the vibration can be easily controlled.

Description

DETAILED DESCRIPTION OF THE INVENTION "Field of Industrial Application" The present invention relates to a method and apparatus for suppressing vibrations acting on a tower-like structure due to external forces such as wind.

``Prior Art'' A method of installing a vibration damping device at the top of a tower is used as a device to reduce vibrations caused by wind and earthquakes in a tower-like structure and improve the function and livability of the structure.

Additionally, various dampers have been proposed to increase the internal damping of structures. In particular, domestic examples of dampers installed in long and narrow structures such as observation towers include dynamic dampers and sloshing dampers.

The vibration damping construction method using dynamic dampers is a method that attempts to suppress the vibration of the building body by adding a small vibration system (e.g., a pendulum or hydraulic damper) that is tuned to the natural period of the building body. Also, the seismic isolation construction method using a sloshing damper is a method in which a sloshing tank filled with fluid is installed above the building, and the vibration period of the building and the fluid are synchronized, so that the water in the sloshing tank resonates. This is a method of suppressing vibrations in buildings.

"Problems to be Solved by the Invention" However, when trying to apply vibration damping methods using dynamic dampers or sloshing dampers to elongated tower-like structures among buildings, there is a risk that the following problems may occur. A) Song.

First, when a tower-like structure becomes taller and its vibration period becomes longer, the vibration damping construction method using a dynamic damper will
It is necessary to increase the mass of the dynamic damper and lengthen its stroke in order to accommodate longer periods, but it is difficult to secure extra installation space for the dynamic damper in tower-like structures, and if it is not possible to install it, Even so, there are problems in that efficiency is poor and period adjustment is difficult.

In addition, when a tower-like structure becomes taller and its vibration period becomes longer, from several seconds to 30 seconds, there is a risk that a construction method using a sloshing damper will not be able to generate a large reaction force due to stable sloshing of the fluid. There is also the problem that if you try to obtain sufficient reaction force, the sloshing tank becomes huge and it is difficult to secure installation space.

The present invention has been made to solve the above-mentioned problems, and provides a vibration suppression method and a vibration suppression device that can be easily applied to tower-like structures with little installation space and can effectively obtain a vibration suppression effect. The purpose is to

"Means for solving the problem" In order to solve the problem, the invention described in claim 1 has the following features:
Two or more rotating bodies are provided on the upper side of the tower-like structure so that they can rotate independently around the structure, and the period and direction of the response motion that occurs in the tower-like structure due to external forces such as wind are measured, and The two or more rotating bodies are rotated with the same period as the response motion of the tower-like structure, and the response motion is canceled out by the resultant reaction force of the two or more rotating bodies. This suppresses vibration.

In order to solve the above problem, the invention described in claim 2 has the following features:
Two or more rotating bodies are provided on the upper side of the tower-like structure so that they can rotate individually around the tower-like structure, and the tower-like structure is provided with two or more rotating bodies that can rotate freely around the tower-like structure, and the tower-like structure is provided with A sensor is provided for measuring the period and direction of the response motion, and the tower-like structure has the same period as the response motion of the tower-like structure detected by the sensor, and cancels the response motion of the tower-like structure. It is equipped with a control device that rotates the rotating body in the direction shown in FIG.

"Action J: When an external force such as wind acts on a tower-like structure, the tower-like structure moves in response to the external force, but two or more rotating bodies installed on the upper side of the tower-like structure rotate. By applying a composite reaction force caused by the inertia of two or more rotating bodies to the tower-like structure,
Inhibits response movements.

In addition, the motion suppression effect on tower-like structures can be increased or decreased depending on the rotation radius and mass of the rotating body installed, so by installing a rotating body with a rotation radius and mass that corresponds to the scale of the tower-like structure, A desired vibration suppression effect can be obtained regardless of the size of the structure. Furthermore, even if there is no installation space within the tower-like structure, the rotating body can be installed along the outer periphery of the tower-like structure, thereby making it possible to implement the system without being constrained by the installation space.

"Embodiment" Figures 1 and 2 show an embodiment of the present invention, in which a wall with an inner diameter larger than the outer diameter of the uppermost tower structure l is installed near the top of the tower structure l. An annular storage body 3.3 is provided horizontally at a predetermined distance from above and below, and the center of the storage body 3 is aligned with the axis of the tower-like structure 1.

The storage body 3 has a hollow structure with a circular cross section as shown in FIG. A rail 4 is laid horizontally inside the storage body 3, and this rail 4 goes around the outside of the structure I at a predetermined radius. A traveling truck (rotating body) 5.6 is engaged with the upper and lower sides of the rail 4, respectively, so as to be able to freely run along the rail 4. Each of these traveling carts 5.6 is equipped with a self-blade traveling device and can independently travel along the rail 4 with a self-blade. As the traveling device for the traveling carts 5 and 6, a traveling device using a general electric motor can be used, but a traveling device using a linear motor can also be used.

In addition, at the top end of the tower-like structure l, there is a state of response movement (
A sensor 7 is provided to measure the movement direction, velocity, phase, period, etc.).

Furthermore, a control device is provided at the top end of the tower-like structure I to control the traveling device of the traveling carriage 5.6 based on the measurement results of the sensor 7. This control device has sensor 7
The traveling trolley 5.6 is made to travel in a period that is the same as the period of the response movement of the tower-like structure 1 measured by , and the resultant reaction force generated by the traveling of the traveling trolley 5.6 is expressed as It acts in the direction opposite to the direction of the response movement.

Next, a case will be described in which an external force such as wind is applied to the tower-like structure I having the above structure.

The traveling carriages 5.6 are individually caused to travel along the rail 4 at predetermined angular velocities (2π/T) by a control device, and with the traveling carriages 5.6 maintaining a predetermined positional relationship. As a result, the traveling carriages 5 and 6 rotate around the tower-like structure l. Note that T in the above equation indicates the period of the traveling truck 5 or 6.

Here, when an external force due to wind force acts on the tower-like structure l, the tower-like structure l starts a response movement. When this response movement is started, the sensor 7 detects the state of the response movement (movement direction, speed, phase, and period) of the tower-like building 1. In this case, the control device controls the period T of the rotational motion of the traveling vehicles 5, 6 to match the period of the tower-like structure 1, and also controls the direction and phase of the rotational motion of the traveling vehicles 5, 6. ,
As a result, the combined reaction force (control force) of the traveling carriage 5.6 is directed in a direction opposite to the moving direction of the tower-like structure 1, and acts in a direction that cancels out the response movement of the tower-like structure 1. here,
If the mass of one running bogie is denoted by W and the radius of the track of the running bogie is r, then a control force expressed by the formula F=Wr(2π/T) acts on one running bogie. is adjusted so as to be approximately in antiphase with the response motion speed of the tower-like structure 1.More specifically, the control device controls the position and rotation speed of the traveling carriage 5.6 in accordance with automatic control theory.
Control is performed in response to response movements while adjusting the errors included in them. In addition, if the response motion of the tower-like structure l is large, or if the motion is expected to be complicated, it can be handled by increasing the number of traveling carts 5 and 6 that run along the rail 4. . In other words, when a response motion appears in a tower-like structure l in a frequency mode (primary mode, secondary mode, torsion mode, etc.), it is necessary to prepare traveling carts with different masses for each mode and run them. You should do it.

Here, furthermore, the rotation direction of the traveling carts 5 and 6, and the rotating direction of the traveling carts 5 and 6,
．． 6, the inertial force (control force) acting on the tower-like structure l will be explained based on FIGS. 4 to 6.

First, when considering the plane coordinates with the origin at the center of the rotation radius of the traveling carriage 5.6, the running carriage 5.6 is simultaneously located on the X-axis on the plane coordinates in FIG.

When the robot is moved at the same speed in the direction of the arrow in FIG. 4, the control force is generated in the direction along the y-axis. Also,
When the carriages 5.6 are moved at the same speed in the direction of the arrow in FIG. 5 so that they are simultaneously positioned on the y-axis on the plane coordinate system in FIG. 5, a control force is generated in the direction along the X-axis. Furthermore, by adjusting the moving direction and phase of the traveling trolley 5.6, the sixth
As shown in the figure, since the control force can be applied in an elliptical shape in plane coordinates, an effective vibration suppression effect can be obtained even when the tower-like structure l moves in response to an external force in an elliptical orbit. I can do it.

Therefore, as mentioned above, by avoiding running the traveling trolley 5.6, it is possible to efficiently suppress the response motion generated in the tower-like structure l due to external forces such as wind, and bring about a vibration damping effect on the tower-like structure l. can. Furthermore, the above-mentioned structure can be expected to be sufficiently effective as a cloud-free construction method when building a tower-like structure with a height of 600 m to 1000 a+, for example.

FIG. 3 shows another example of the storage body provided in the tower-like structure 1, and the storage body 3° in this example is formed to have an elliptical cross section. As in this example, the storage body may have an elliptical cross section, or may have other shapes. In addition,
It is preferable that the design of the storage body provided in the tower-like structure is designed so as not to spoil the beauty of the tower-like structure.

FIG. 7 and FIG. 8 show a third embodiment of this invention.
In this example, a large-diameter portion 11 is formed near the top of the tower-like structure 10 along the outer peripheral surface of the tower-like structure IO,
This large-diameter portion 11 is divided into six upper and lower layers, and on the innermost outer periphery of each layer is a running bogie 1 equivalent to the running bogie 5.6 of the above embodiment.
2 is provided so that it can run freely. In addition, the tower-like structure 10
A sensor 7 and a control device similar to those in the previous embodiment are provided at the top end.

In this embodiment as well, the same effects as in the previous embodiment can be obtained. In this embodiment, six running carts 12 are provided, so even if the tower-like structure lO undergoes a complicated response movement, the running state of each cart 12 can be individually controlled to achieve an effect. It can exert a suppressive effect.

9 to 11 show a fourth embodiment of the present invention. In this embodiment, the top end of the tower-like structure 20 has an outer diameter larger than the outer diameter of the tower-like structure 20. A hollow disk-shaped storage body 21 is installed horizontally.

A disk 22 having an outer diameter larger than the upper end of the tower-like structure 20 is provided inside the storage body 21, and a drive device 23 for rotating the disk 22 is provided at the center inside the storage body 21. It is provided. Further, on the upper and lower surfaces of the disc 22, eighth
As shown in the figure, a groove 24 is formed that extends diametrically from the center of the disk 22 toward the outer periphery.
A traveling trolley 25 is movably and fixedly engaged with. Further, at the upper end of the tower-like structure 20, the first
A sensor 7 having the same function as the sensor 7 of the embodiment and a control device having the same function as the control device of the first embodiment are provided.

In the apparatus of this embodiment, the disk 22 is rotated in accordance with the response movement of the tower-like structure l. In addition, the traveling trolley 25
are moved along the grooves 24 and fixed at optimal positions, thereby exerting the inertial force accompanying the rotation of the disk 22, thereby suppressing the response movement of the tower-like structure 20.

By the way, the method of obtaining a constant control force by rotating the traveling carriage as in each of the above embodiments is effective for tower-like structures l.
This is limited to cases where the response of is relatively stationary, such as in the case of wind. Therefore, in the response of tower-like structure I to an earthquake, although it has little effect on unsteady strong external forces near the main earthquake motion, it is sufficiently effective against free vibration components that persist for a long time after the main motion. In this case, the vibration suppressing effect can be sufficiently exhibited.

"Effects of the Invention" As explained above, the present invention suppresses the response motion generated in a tower-like structure due to external forces such as wind by the combined reaction force of two or more rotating bodies rotating around the tower-like structure. Therefore, it is possible to obtain a tower-like structure that has a high vibration suppression effect against external forces such as wind. Furthermore, by adjusting the rotational speed, phase, and period of the rotating body, it is possible to effectively suppress the response motion in all directions acting on the tower-like structure. Furthermore, by adjusting the mass and radius of rotation of the rotating body, the magnitude of the resultant reaction force can be adjusted, so it can be applied regardless of the size of the tower-like structure.

[Brief explanation of drawings]

FIG. 1 and FIG. 2 show a first embodiment of this invention.
Fig. 1 is a side view of the tower-like structure, Fig. 2 is a sectional view of the vibration suppressor, Fig. 3 is a sectional view showing another example of the storage body, and Fig. 4 explains the behavior state of the vibration system. FIG. 5 is an explanatory diagram for explaining the behavior state of the vibration system, FIG. 6 is an explanatory diagram for explaining the behavior of the vibration system, and FIGS. 7 and 8 are diagrams for explaining the behavior of the vibration system. Fig. 7 is a side view of the tower-like structure, Fig. 8 is an enlarged view of the main part,
9 to 11 show a fourth embodiment of the present invention, in which FIG. 9 is a side view of the tower-like structure, FIG. 10 is a sectional view of the storage body, and FIG. 11 is a plan view of the disk It is a diagram. ■0...Tower-like structure, 1.2 Storage body,...Rail, rolling body),...Sensor.・・Traveling trolley (times)

Claims (2)

[Claims] (1) Two or more rotating bodies are installed on the upper side of the tower-like structure so that they can rotate independently around the structure, and the period and direction of the response motion that occurs in the tower-like structure due to external forces such as wind is measured. At the same time, the two or more rotating bodies are rotated with the same period as the response motion of the tower-like structure, and the response motion is canceled out by the resultant reaction force of the two or more rotating bodies. A method for suppressing vibrations of a tower-like structure, characterized by suppressing vibrations of the structure. (2) Two or more rotating bodies are provided on the upper side of the tower-like structure so as to be able to rotate individually around the tower-like structure, and the tower-like structure is formed by external force such as wind. A sensor is provided for measuring the period and direction of the response motion occurring in the object, and the response of the tower structure is set to the tower-like structure with the same period as the response motion of the tower-like structure detected by the sensor. A vibration suppression device for a tower-like structure, comprising a control device that rotates a rotating body in a direction that cancels the motion.