JPH04194179A - Active type vibration control system using cylinder lock device - Google Patents

Abstract

PURPOSE:To promote the safety of a structure by providing a cylinder lock device between a column and beam skeleton and a variable rigidity element and, at the same time, controlling a damping coefficient of the lock device by a computer. CONSTITUTION:Braces 35 are fixed to a column and beam skeleton 31 consisting of columns 33 and beams 34 through a cylinder lock device equipped with a pressure oil selector valve. An opening of the selector valve is controlled by a computer by the direction of recovering force of the column and beam skeleton 31 against layer displacement with vibration external force and the direction of damping force against the skeleton of the cylinder lock device A. According to the constitution, the safety of a structure can be secured.

Description

Detailed Description of the Invention [Field of Industrial Application] The present invention uses a cylinder lock device installed in the column-beam frame of a structure to reduce the amount of response of the structure to external vibrational forces such as earthquakes, and improve the structure's performance. This relates to active vibration damping systems to ensure safety.

[Conventional technology]

The applicant incorporates variable rigidity elements (earthquake-resistant elements) in the form of places, walls, etc. into the column-beam frame of a structure, and makes the rigidity of the variable rigidity element itself or the state of connection between the frame body and the variable rigidity element variable. We have developed active bracing systems and variable rigidity structures that improve the safety of structures by analyzing their characteristics using computers and changing the rigidity of structures to eliminate vibrations from external vibrational forces such as earthquakes and wind. Various proposals have been made (for example, JP-A-62-268479, JP-A-63-11477).
No. 0, JP-A-63-114771, etc.).

In addition, various active damping systems have been proposed that take into consideration the non-resonance and damping properties of structures by using hydraulic variable damping devices with variable damping coefficients (for example, Japanese Patent Application Laid-Open No.
209568-71 etc.).

Further, as a variable damping device that can be used in these active damping systems, there is a cylinder lock device disclosed in Japanese Patent Application No. 2-37992. The basic principle of this cylinder locking device is that hydraulic chambers are provided on both sides of both rod-shaped pistons in the cylinder body, and the pistons are fixed by closing or flowing the pressure oil in both hydraulic chambers with a switching valve. Or it can be moved freely. When a cylinder lock device is used in an active damping system, a variable stiffness element is provided within the column-beam frame of the structure, and a cylinder body is provided between the column-beam frame and the variable stiffness element (or between the variable stiffness elements). and connect the rod to the other. When the switching valve is fully open, the pressure oil can substantially move freely, and the damping coefficient of the cylinder lock device takes the minimum value Cmtn. At this time, relative movement between the column-beam frame and the variable rigidity element is also substantially free. When the switching valve is closed, there is virtually no movement of pressure oil (it does not necessarily have to be completely closed), and the damping coefficient of the cylinder lock device is the maximum value c, 68.
Take. At this time, the column-beam frame and the variable rigidity element are substantially fixed or nearly fixed.

[Problem to be solved by the invention]

The present invention has been newly proposed as an active vibration damping system for structures, and a cylinder lock device is installed within the column-beam frame to control the structure's response to wind, earthquakes, etc.
The cylinder locking device is actively controlled to reduce the layer shear force applied to the structure while observing the external disturbances), thereby reducing the response of the structure and increasing the safety of both the structure and equipment. The purpose is to ensure a comfortable living space as well as to ensure a comfortable living space.

[Means to solve the problem]

The active damping system of the present invention provides variable rigidity elements within the column-beam frame of a structure, connects the column-beam frame and the variable-rigidity elements (or the variable-rigidity elements to each other) via a cylinder lock device, and By controlling the opening/closing state of the switching valve of the cylinder lock device from time to time in response to such external vibrational forces, the response of the structure to external vibrational forces is reduced.

A cylinder lock device has hydraulic chambers on both sides of a double rod-shaped piston in the cylinder body, and the piston is fixed or movable by closing the pressure oil in both hydraulic chambers with a switching valve or allowing it to flow. Then, the cylinder is connected to one of the column-beam frame and the variable rigidity element, or to one of the variable rigidity elements, and the rod is connected to the other.

By opening the switching valve and allowing relative displacement between the cylinder and the rod, relative displacement between the column and beam frame and the variable rigidity element is also allowed, and by closing the switching valve and restraining the relative displacement between the cylinder and the rod, the column and beam The frame and the variable stiffness element are substantially fixed, and the stiffness of the variable stiffness element is added to the stiffness of the column and beam frame.

With the cylinder lock device installed as described above, in the active damping system of the present invention, the direction of the restoring force of the column-beam frame against the inter-story displacement due to external vibration force and the damping force of the cylinder lock device on the column-beam frame are determined. Regarding the direction of , when the direction of the restoring force and the direction of the damping force are the same, the switching valve is fully opened and the damping coefficient of the cylinder lock device is at the minimum value Cmi. When the direction of the restoring force and the direction of the damping force are opposite to each other, the switching valve is closed and the damping coefficient of the cylinder lock device is controlled to take the maximum value cma+t.

The direction of the restoring force is given, for example, from the interstory displacement detected by a sensor such as a displacement meter installed in the column-beam frame on each floor of the structure. The sensor may be a speedometer, or the sensor may be provided in the cylinder locking device.

The direction of the damping force is given, for example, from the relative speed between the cylinder and the rod, which is detected by a sensor such as a speedometer provided in the cylinder lock device. In addition, it can also be determined from the value of the pressure gauge of the cylinder lock device.

[For production]

The active damping system of the present invention reduces the response of the structure by reducing the layer shear force related to the structure, and the direction of the restoring force of the column-beam frame and the damping force from the cylinder lock device are controlled. At the time when the directions are the same, the damping coefficient of the cylinder locking device is at the minimum value Cat. By doing so,
The layer shear force roughly corresponds to the restoring force. On the other hand, when the direction of the restoring force and the direction of the damping force are opposite, the damping coefficient of the cylinder lock device is set to the maximum value cm in order to maximize the damping force of the cylinder lock device and reduce the layer shear force. I try to take it.

〔Example〕

Examples of the present invention will be described below.

Figures 5 and 6 show an example of the cylinder lock device A used in this embodiment, in which both sides of the double rod-shaped piston 2 in the cylinder body 1 (hereinafter, left and right sides in the figures are respectively referred to as left and right sides) are shown. A hydraulic chamber 6 is provided in the left and right hydraulic chambers 6, and the pressure oil in the left and right hydraulic chambers 6 is closed by a valve.
Or fix the piston 2 by causing it to flow,
Alternatively, it can be moved left and right.

The left and right hydraulic chambers 6 are respectively provided with an outflow prevention check valve 8 that prevents pressure oil from flowing out of the hydraulic chamber, and an inflow prevention check valve 9 that prevents pressure oil from flowing into the hydraulic chamber. The left and right outflow prevention check valves 8 are connected to the cylinder body 1.
are connected by an inflow channel 10 provided along the
The left and right inflow prevention check valves 9 are connected by an outflow passage 11 provided along the cylinder body 1, and the inflow passage 10 and the outflow passage 11 are connected via a switching valve 12.
The switching valve 12 is configured to switch between connecting and blocking the flow paths 10 and 11.

In addition, the switching valve 12 is a switching valve having an inlet boat 14 and an outlet port 15 on one end side of the valve body and a back pressure boat 16 on the other end side, and the inlet port 14 and the back pressure boat 16 are connected. A shutoff valve 18 is provided on the pressure port 16 side to prevent pressure oil from flowing out.

An example of such a switching valve 12 is a cartridge-type switching valve, which has a throttle 22 and is made up of a cartridge 24 biased by a spring 25, as shown in FIG. 5, and is closed by back pressure and biasing force. Can be used. In the hydraulic circuit diagram of FIG. 6, this is replaced with a piston-type switching valve that is opened and closed by the movement of the piston 13 having a small diameter portion 13a and a large diameter portion 13b, and closed by the difference in pressure receiving area.

In order to be able to install it in a narrow installation space, as shown in FIG. In that case, check valves 8 and 9 may be provided on both sides of the tube 5, and the outflow passage 11 may be provided on the side of the cylinder body 1.

Further, it is preferable to provide an accumulator 20 in the inflow channel 10 or the outflow channel 11 for the purpose of compensating for volume changes due to oil compression and temperature changes.

This cylinder lock device A mentioned above! -! Since the cylinder body 1 is equipped with two oil passages 10 and 11, check valves 8 and 9, and a switching valve 12, the passage length can be shortened and the passage area can be reduced. By being large and reducing passage resistance, it is possible to flow a large amount of pressure oil at high speed and shut it off instantaneously. Furthermore, by using a back pressure type switching valve, it can be opened and closed instantaneously, and in combination with the above-mentioned structure, the response speed can be extremely fast.

The cylinder lock device A can be conceptually simplified as shown in FIG. control between unlocked and unlocked states. At this time, the damping force of the cylinder lock device A on the frame body is the same as that of the cylinder body 1 and the piston 2.
It is given as a resistance force (P=cv') proportional to the power of the relative velocity of .

Next, a specific control method using such a cylinder lock device will be explained.

Figure 2 shows an outline of a structure to which the system of the present invention is applied, in which cylinder lock device A is installed.
A cylinder lock device A is interposed between the column-beam frame 31 of each layer in the frame body constituted by #3 and the beam 34 and the inverted V-shaped place 35 as a variable rigidity element incorporated in the column-beam frame 31. ing. Figure 3 shows this as a vibration model, where kFi is the elastic modulus of the column-beam frame in the first layer, kBi is the elastic modulus of the place (variable stiffness element) in the first layer, and C8 is the elastic modulus of the first layer This is the damping coefficient (variable) of the cylinder lock device installed in the column-beam frame.

In the above model, the layer shear force Q acting on the first layer
, is the damping force of the cylinder lock device installed in that layer (
ctvi') and the restoring force of the column-beam frame in that layer (kpiX
It can be expressed as a quantity obtained by multiplying the sum of i> by a negative sign.

That is, Q,=-((ctv+')+(kptxt))
−(1)Q,=”(mi(father soup father)) Here, ml: Mass of the first node i = Relative acceleration of the i-th node ji: Earthquake human force acceleration Now, focusing on equation (1), Consider reducing Q. Here, Q is composed of the damping force (clv,') of the cylinder lock device and the restoring force (k) of the column-beam frame.
ptXt), and when the signs of both are equal, the damping force contributes to increasing Q. Therefore, the damping coefficient C0 of the cylinder lock device is set to 0 to control the damping force so that it does not work.

That is, here, C1. is the minimum value of the damping coefficient that the cylinder lock device can take, and C□ is the damping coefficient that provides the maximum damping effect for the structure.

The control law is given by equation (2), and in equation (2),
Since C0 and kFl are constants, the control law can be expressed in a simplified form as shown in the equation below.

According to equation (3), the state quantities vi' and x1 are measured in real time, a computer makes a judgment, and a control command is sent to the cylinder lock device, thereby making it possible to control the structure.

Figure 1 summarizes an example of the active damping system according to the present invention in the form of a flowchart, and shows the response of the structure to external disturbances such as earthquakes and wind by measuring the interstory displacement of each layer and the relative relationship of the cylinder lock device. Sensing regarding speed.

From these, it is determined whether the signs of the restoring force of the column-beam frame and the damping force of the cylinder lock device are equal, and if the signs are the same, the switching valve of the cylinder lock device is fully opened so that the damping force is 0 or almost 0. , when the signs are reversed, the switching valve is closed to generate the maximum damping force.

FIGS. 7 to 14 show examples of installing a cylinder lock device in a column-beam frame.

In the example shown in FIG. 7, a cylinder lock device A is interposed between the column-beam frame 31 and an inverted V-shaped place 35 as a variable rigidity element.

In the example shown in FIG. 8, a cylinder lock device A is interposed between frames 41 that are erected or suspended from a column-beam frame 31 and upper and lower beams 34, and a moment resistance frame as a variable rigidity element is constructed. This is the case.

In the example of FIG. 9, the column-beam frame 31 and R as a variable rigidity element
A cylinder lock device A is interposed between C and the earthquake-resistant wall 42.

The example in Figure 10 is an example where a cylinder lock device A is provided at the base of a seismic isolation structure in combination with a seismic isolation rubber 43 such as laminated rubber, and the cylinder lock device A plays the role of a damper in the seismic isolation structure. is fulfilled. The variable stiffness element in this case can be considered the foundation of the structure.

In the example shown in FIG. 11, an X-shaped place 44 provided within the column-beam frame 31 is used as a variable rigidity element, and a cylinder lock device A is interposed laterally in the center of the X-shape.

The example in Figure 12 is similar to the example in Figure 11, where the X-shaped place 45
While the example shown in FIG. 9 was a horizontal type in which the cylinder lock device A was installed horizontally, this example is a vertical type in which the cylinder lock device A is installed vertically.

The example of FIG. 13 is similar to the example of FIG. 9, in which a cylinder lock device A is interposed between the column-beam frame 31 and the RC shear wall 46 as a variable rigidity element. It is characterized in that it is provided above an opening 47 such as an entrance/exit.

In the example shown in Fig. 14, the cylinder lock device A is interposed in the center of the X-shaped place 48 of the large frame.
9 and place 48 are separated.

[Effects of the Invention] (1) By performing control using the development system of the present invention, the following advantages regarding the enforcement effect can be expected.

a. By performing the control, the layer shear force can be significantly reduced compared to the case where the control is not performed.

By reducing the shear force on the 61st floor, the amount of response (displacement, velocity, top floor acceleration) can also be automatically reduced.

Since the main focus is on reducing the shear force of the C9 layer, the restraint effect can be achieved without placing an excessive burden on the cylinder lock device and the like as well as the frame.

■ The only sensors required in the structure for the system of the present invention are a speed meter in the equipment section (a pressure gauge may be used) and a displacement meter on each floor of the building (a displacement meter in the equipment section or a speed meter on each floor of the building may be used). Yes, the sensor required for normal feedback control can be omitted.

■ By measuring ground motion acceleration at the base of a structure, it is also possible to predict the amount of response on each floor and compensate for system time delays.

[Brief explanation of the drawing]

Fig. 1 is a flowchart of an embodiment of the active deployment system of the present invention, Fig. 2 is a schematic diagram showing an example of application to a structure, Fig. 3 is an explanatory diagram of a vibration model, and Fig. 4 is a flowchart of an embodiment of the active deployment system of the present invention. A conceptual diagram of the cylinder lock device used, FIG. 5 is a sectional view showing the internal structure of a specific example of the cylinder lock device, FIG. 6 is its hydraulic circuit diagram, and FIGS. 7 to 14 are the pillars and beams of the cylinder lock device. FIG. 2 is a schematic diagram showing an example of an installation position within a structure. A... Cylinder lock device, 1... Cylinder body, 2... Piston, 3...
Piston rod, 4...cover, 5...tube,
6... Hydraulic chamber, 8... Outflow prevention check valve, 9...
...Inflow prevention check valve, 10...Inflow channel, 1
DESCRIPTION OF SYMBOLS 1... Outflow channel, 12... Switching valve, 13... Piston, 14... Inlet port, 15... Outlet port, 16-... Back pressure port, 17... Bypass flow Road, 1
8... Shutoff valve, 20... Accumulator,
21... Accessory member, 22... Throttle, 23... Channel, 24... Cartridge, 25... Spring, 3
1... Column beam frame, 33... Column, 34... Beam, 35
...Place, Figure 1, Figure 2rA, Figure 3, Figure 7, Figure 9, Figure 8, Figure 10.

Claims (3)

[Claims] (1) A variable rigidity element is provided within the column-beam frame of the structure, and hydraulic chambers are provided between the column-beam frame and the variable-rigidity element or between the variable-rigidity elements on both sides of the double-rod-shaped piston in the cylinder body; The pressure oil in both the hydraulic chambers is closed by a switching valve,
or fixing the piston by causing it to flow;
Alternatively, the structure is connected via a movable cylinder lock device, and the response of the structure to the vibration external force is reduced by controlling the opening and closing of the switching valve of the cylinder lock device momentarily against vibration external forces such as earthquakes. In the active damping system, a cylinder of the cylinder lock device is connected to the column-beam frame and the variable rigidity element, or one of the variable-rigidity elements, and a rod is connected to the other, and the column-beam frame is protected against interstory displacement due to the external vibration force. Regarding the direction of the restoring force of the cylinder locking device and the direction of the damping force of the cylinder locking device with respect to the column-beam frame, when the direction of the restoring force and the direction of the damping force are the same, the switching valve is fully opened and the cylinder The damping coefficient of the locking device is set to a minimum value c_m_i_n, and at a point in time when the direction of the restoring force and the direction of the damping force are opposite, the switching valve is closed and the damping coefficient of the cylinder locking device is set to the maximum value. An active damping system using a cylinder lock device, characterized in that it is controlled so as to take c_m_a_x. (2) The active damping system using a cylinder lock device according to claim 1, wherein the direction of the restoring force is determined from interstory displacement detected by a sensor provided in the column-beam frame. (3) An active damping system using a cylinder lock device according to claim 1, wherein the direction of the damping force is determined from the relative velocity between the cylinder and the rod detected by a sensor provided in the cylinder lock device.