JP3397199B2 - Control method of variable damping device for damping structure - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an efficient control method for a variable damping device for a seismic control structure for reducing the vibration of a building due to an external vibration force such as an earthquake or wind.

[0002]

2. Description of the Related Art As a damping system of a hydraulic damper type for reducing the vibration of a building, there is a variable damping device or the like in which the opening degree of an opening / closing control valve can be controlled in two stages of full opening and full closing (for example, See Japanese Patent No. 2959554).

The basic structure of such a variable damping device is, as shown in FIG. 4, a cylinder 2, a piston 3 which reciprocates in the cylinder 2, a hydraulic chamber 4 provided on both sides of the piston 3, and both hydraulic chambers 4. The opening / closing control valve 6 and the like provided in the flow path 5 for connecting the two are connected to each other, and the opening / closing control valve 6 is opened / closed in two stages of full closing and full opening by the current supply from the controller, so that the damping coefficient becomes the maximum value C _max . It is possible to switch to two levels of the minimum value C _min .

Since such a variable damping device 10 is mounted between building layers via structural elements such as braces 13, the mechanical characteristics of the device part including the braces 13 are as shown in FIG. It is represented by a Maxwell type model in which pots are connected in series.

In the invention disclosed in the above-mentioned Japanese Patent No. 2959554, by switching the damping coefficient of the device, that is, the valve opening at the maximum amplitude point of vibration, large energy absorption as shown in FIG. It can be reduced.

Further, since the valve opening need only take two steps, that is, the valve opening is fully closed or fully opened, a device capable of continuously variably controlling the valve opening (for example, see Japanese Patent Publication No. 7-45781). In comparison, the structure of the device can be simplified.

[0007]

However, by using the two-step switching type variable damping device as described above, as shown in FIG.
When such control is performed, the load generated in the device is suddenly unloaded at the maximum displacement point at which the damping coefficient is switched from C _max to C _min , so that a large acceleration is instantaneously generated. Sometimes.

In the sense that the building response displacement is greatly reduced and the seismic safety is improved, the above control is sufficient, but during a wind response due to a small earthquake or typhoon, there is a possibility that habitability will be impaired by the generated acceleration. There is.

The present invention is intended to solve the above-mentioned problems, and is for a vibration control structure capable of reducing the response of both acceleration and displacement while maintaining the simple structure of the variable damping device . An object of the present invention is to provide a control method for a variable damping device.

[0010]

According to a first aspect of the present invention, there is provided a control method for a variable damping device for a vibration control structure, which is provided on a cylinder, a piston reciprocating in the cylinder, and both sides of the piston. A plurality of hydraulic chambers that connect both hydraulic chambers
E Bei and provided in the flow channel opening and closing control valve, by controlling the opening and closing of the front SL-off control valve provided in a plurality of channels, to switch the damping coefficient of the device in multiple stages of three or more stages The control method of the variable damping device
The response displacement in the vibration cycle.
The maximum damping coefficient before the position reaches the maximum amplitude point
Possible by switching from C _max to an intermediate damping coefficient C _mid
Avoid sudden unloading of the force generated in the variable damping device, and
At the maximum point, the attenuation coefficient is reduced to the minimum value from the intermediate attenuation coefficient C _mid.
Completely remove the remaining load by switching to the extinction coefficient C _min
And the attenuation coefficient is cut again to the maximum attenuation coefficient C _max .
It is characterized in that the control for changing is repeated .

This variable damping device, like the conventional variable damping device, is fixed inside the column-beam frame by, for example, fixing the cylinder to the beam of the column-beam frame and connecting the piston to a seismic element such as a brace or a seismic wall. Incorporated (cylinder and piston can be installed in reverse, or the device can be incorporated into seismic element)

The open / close control valve for each flow path can basically be controlled between fully open and fully closed, or between two types of opening (open and closed) having a certain throttle that gives a specific damping coefficient. If In that case, by closing all the on-off control valves, the damping coefficient has the maximum damping coefficient C _max .

The damping coefficient which is the main object of the present invention is 3
As for the case of controlling a variable damping device that can be switched in stages, two flow paths connecting both hydraulic chambers are provided in parallel, an opening / closing control valve is provided in both flow paths, and one flow path further has an orifice or other throttle. Is provided, or the opening degree of the on-off control valve itself is made different as described above, so that two types of damping coefficients C _mid and C _min are closed when either one is closed.
Is obtained.

Therefore, by controlling the two opening / closing control valves in combination with the two flow paths, the maximum damping coefficient C _max , the intermediate damping coefficient C _mid , and the minimum damping coefficient C _min (usually, the opening is large). When the open / close control valve is opened, the minimum damping coefficient C is substantially obtained regardless of the open / close state of the other open / close control valve.
It becomes possible to control between three steps of damping factors (being _min ).

In principle, switching in four or more stages can be considered in the same way by increasing the number of parallel flow paths.

According to a second aspect of the present invention , in the method of controlling the variable damping device for a vibration control structure according to the first aspect, the variable damping device is provided.
But at least one of said plurality of channels, in which an orifice is provided in series with the switching control valve of the flow path
It is a limited case .

Although related to what has been described in the description of the invention according to claim 1, by providing an orifice in series with the on-off control valve, the damping coefficient C _mid peculiar to the flow passage can be determined (the intermediate damping). The coefficient C _mid becomes a plurality of different attenuation coefficients C _mid1 , C _mid2 , ... In the case of switching in four steps or more).

According to a third aspect of the present invention , in the method of controlling the variable damping device for a vibration control structure according to the second aspect , the variable damping device is provided.
But in which off control valve provided in said orifice in series was limited <br/> case in which are set to be opened when deenergized.

When power is cut off due to a power failure or when the device is stopped to avoid malfunction, the opening / closing control valve is closed for the flow path without an orifice among the two flow paths provided in parallel. If the open / close control valve is opened for a certain flow path, it can function as a passive hydraulic damper that gives a damping coefficient (intermediate damping coefficient C _mid ) according to the restriction by the orifice. The same can be considered when there are three or more channels.

A variable damping device for such a vibration control structure is
For example write set via the seismic elements in beam-column rack premises structure or
Be done.

The control of the variable damping device can also be controlled by providing a sensor separately from Column rack構側a device based on the response of the structure due to an earthquake or the like, patents mentioned above 29595
As in the invention described in Japanese Patent Publication No. 54, if a plurality of arranged variable attenuators are individually controlled by the information of only the device section, a system that does not require a sensor, a control computer, wiring or the like outside the device is obtained. You can also do it.

[0022]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows an example of the basic structure (FIG. 1 (a)) and its installation form (FIG. 1 (b)) in an embodiment of the variable damping device used in the present invention. is there. This variable damping device is designed so that the damping coefficient of the device can be switched among three stages of a maximum value C _max and a minimum value C _min , and an intermediate value C _mid thereof, whereby a displacement response reducing effect is obtained as described later. The acceleration response can be significantly reduced while maintaining.

As a concrete configuration of the variable damping device 1 shown in FIG. 1 (a), a cylinder 2, a piston 3 which reciprocates in the cylinder 2, and hydraulic chambers 4 provided on both sides of the piston 3 are shown. And two flow paths 5a and 5b are provided in parallel so as to connect the two hydraulic chambers.

An open / close control valve 6a (electromagnetic switching valve or the like) capable of switching between fully open and fully closed is provided in the flow path 5a in the upper side of the figure which constitutes the circuit A. On the other hand, the lower flow path 5b forming the circuit B is similarly provided with an open / close control valve 6b that can be switched between fully open and fully closed.
An orifice 8 is provided in series with b (an electromagnetic switching valve or the like).

The maximum damping coefficient C _max is realized by closing both the circuits A and B, and the circuit B is kept closed.
Is opened to realize an intermediate damping coefficient C _mid defined by the orifice 8, and regardless of the state of the circuit B, the minimum damping coefficient C _min is realized by opening the circuit A.

The orifice characteristic of the orifice 8 of the circuit B is determined by the target unloading speed, but this value is simply set in a form close to the damping characteristic when the device is set as a passive damper. You can

In this case, the circuit A is set to be closed when the power is cut off and the power supply is set to open when the power is supplied, and the circuit B is set to be open when the power is cut and closed when the power is supplied. At the time of a power failure, only the circuit B is valid and can function as a passive damper having a damping coefficient C _mid .

That is, the three-stage switching variable damping device is
It can also function as a damper with a fail-safe function when the power is cut. In order to function as a passive damper, it is necessary to exhibit appropriate damping characteristics, and this is realized by the fixed orifice 8 in Fig. 1 (a), but instead of the orifice, a pressure regulating valve, etc. It is also possible to use.

FIG. 2 shows the relationship between the load F of the variable damping device and the interlayer deformation x in the case of a constant amplitude δ in the control example using the variable damping device of FIG.

[0030] Specifically, since before reaching the response displacement amplitude maximum point, switch the damping coefficient from C _{ma x} to C _mid. As a result, the force generated in the device section slowly escapes, so that shock acceleration due to sudden unloading does not occur.

If C _mid is perfectly adjusted, the load becomes exactly 0 at the maximum amplitude point, but this is not necessarily the case in an actual random seismic response embodiment, so C _mid
The value is set to a slightly large value, and the attenuation coefficient is switched from C _mid to C _min at the maximum amplitude point. As a result, the remaining load is completely absorbed, and the energy absorption efficiency can be maintained high.

[0032] FIG. 3 is an overview of the seismic control structure incorporating variable damping device 1 for use in the present invention, through the brace 13 constituted the variable damping device 1 as described above pillars only write set to the beam rack premises, control method described above
By controlling the variable damping device 1 by using , the building is provided with a vibration control function, and it is possible to prevent the occurrence of momentary large acceleration due to sudden unloading of the load, and to make the living comfortable even with vibration due to a small earthquake or wind. Can maintain sex.

[0033]

The control method of the variable damping device of the present invention is as follows.
Characteristics of a variable damping device that can control the damping coefficient in three stages or multiple stages by using a plurality of parallel flow paths while maintaining a simple structure in which the opening and closing of the opening / closing control valve is switched in two stages
When applied to a seismic control structure, the variable damping device can be controlled by the method of the present invention.
By doing so, it is possible to avoid a large acceleration that occurs momentarily when switching the damping coefficient.

That is, it is possible to reduce the response of both acceleration and displacement while maintaining a simple structure.
As a result, it is possible to maintain comfortable habitability during seismic control.

[Brief description of drawings]

FIG. 1 is a variable reduction to be controlled by a control method according to the present invention.
Show one embodiment of Attenuation device is (a) is a schematic view showing a basic structure of a variable damping device, (b) is an explanatory view showing an example of the installation mode.

FIG. 2 is a graph showing the relationship between the load F of the variable damping device and the interlayer deformation x in a control example according to the control method of the present invention in the case of a constant amplitude.

FIG. 3 is a schematic diagram showing a vibration control structure to which the present invention is applied .

FIG. 4 shows a conventional example, (a) is a schematic diagram showing a basic structure of a conventional two-stage switching variable damping device, and (b) is an explanatory diagram showing one example of its installation form.

5 is a diagram of a dynamic model corresponding to FIG. 4 (b).

FIG. 6 is a graph showing the relationship between the load F and the interlayer deformation x of the variable damping device in the control example of the conventional two-stage switching variable damping device in the case of a constant amplitude.

[Explanation of symbols]

1 ... Variable damping device, 2 ... Cylinder, 3 ... Piston, 4 ...
Hydraulic chambers, 5, 5a, 5b ... Flow paths, 6, 6a, 6b ... Open / close control valves, 7 ... Control circuits, 8 ... Orifices, 10 ... Conventional variable damping device, 11 ... Pillars, 12 ... Beams, 13 ... Braces

Front page continuation (58) Fields surveyed (Int.Cl. ⁷ , DB name) E04H 9/02 311 E04H 9/02 301 F16F 15/00-15/36

Claims (3)

(57) [Claims] 1. A cylinder, a piston reciprocating in the cylinder, hydraulic chambers provided on both sides of the piston, and an opening / closing control valve provided in a plurality of flow paths connecting the hydraulic chambers. for example, pre-Symbol by controlling the opening and closing of the provided opening and closing control valve to a plurality of channels, and to switch the damping coefficient of the device in multiple stages of three or more stages of variable damping device
The control method is
The response displacement in the vibration cycle reaches the maximum amplitude point
Attenuating the damping coefficient in the foreground from the maximum damping coefficient C _max to the middle damping
By switching to the coefficient C _mid
Avoid sudden unloading of the applied force and set the damping coefficient at the maximum amplitude point.
It switched from the attenuation coefficient C _mid between the minimum damping coefficient C _min
By absorbing the remaining load completely, the damping
The control for switching the number to the maximum damping coefficient C _max is repeated.
Control method of variable damping device for seismic control structure characterized by
Law. Wherein said variable damping device, wherein at least one of the plurality of flow paths, seismic control structure according to claim 1, wherein in which off control valve and the orifice in series flow path is provided Method for controlling variable damping device for automobile. Wherein the variable attenuation device, the orifice and Vibration Control structure for variable damping apparatus off control valve provided in series claim 2, wherein is obtained by such an open state when deenergized Control method .