JPH08303050A - Vibration control device of automatic damping coefficient adjustment type - Google Patents

Abstract

PURPOSE: To enhance safety as well as comfortability by applying the constitution in which a variable damping device installed within a frame is equipped with a device for amplifying and converting displacement to signal electric power, an integrating circuit for finding displacement and the like, and a vibration frequency at every moment is fed back. CONSTITUTION: A pinion 20, a rack 21, an increasing gear train 22 to amplify relative displacement are provided in such a state as connected to the piston 4 of a piston type variable damping device 1 installed within the column-beam frame of a structure, and a generator 23 is driven to convert displacement velocity to signal electric power. Furthermore, a differentiating circuit 26 for differentiating the signal electric power and finding acceleration (a) acting on the frame is provided, together with an integrating circuit 27 for integrating the signal electric power and finding displacement X. Then, a vibration frequency ω1 at every moment is identified from the acceleration (a) and the displacement X by using an equation W1 =1a/x1<1/2> , and fed back to the device 1 for controlling a piston 3. At the same time, the application of a damping force is thereby kept at a high level, when the vibration period of a building varies or higher harmonics are prominent. According to this construction, the safety and comfortability of the structure can be enhanced.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a damping coefficient adjusting type damping device for imparting a high damping property to the response of a structure to a vibration external force such as an earthquake or wind and reducing the vibration.

[0002]

2. Description of the Related Art A variable damping device for a seismic control structure is installed in a frame of a structure, and the damping coefficient of the device is actively changed according to the characteristics such as individual earthquakes and external wind forces. The damping resistance reduces the sway of the structure, and the control means using a computer or the like can perform control in which the damping property of the structure is evaluated.

As such a variable damping device for a vibration control structure, there is, for example, the one described in JP-A-2-289769.

FIG. 2 is a diagram showing an example of such a variable damping device as a hydraulic circuit diagram. Hydraulic chambers 6 are provided on the left and right sides of a double rod type piston 3 that reciprocates in a cylinder 2, and the left and right sides of the hydraulic chambers 6 are provided. The piston 3 is fixed or movable left and right by closing and flowing the hydraulic pressure in the hydraulic chamber 6 with a valve.

Then, the cylinder 2 and the rod 4 are respectively connected to the columns of the structure, the beam frame main body, or the seismic resistant elements such as the brace and the seismic wall to provide damping resistance against the deformation of the columns and the beam frame.

The left and right hydraulic chambers 6 respectively include an outflow prevention check valve 8 for preventing the pressure oil from flowing out of the hydraulic chamber 6 and an inflow prevention check valve 9 for preventing the pressure oil from flowing into the hydraulic chamber 6.
Is provided for connecting the left and right outflow prevention check valves 8 to each other, and the left and right inflow prevention check valves 9
An outflow passage 11 for connecting the two is provided.

These inflow channel 10 and outflow channel 11
A flow rate control valve 12 is provided at the connecting position of, and the damping coefficient c of the variable damping device 1 can be adjusted by changing the opening degree of the flow rate control valve 12.

Further, in this example, the flow rate control valve 12 has a large flow rate switching valve 12a having an inlet port 15 and an outlet port 16 on one end side of the valve body and a back pressure port 17 on the other end side.
A shut-off valve 12b capable of controlling the outflow of pressure oil to the back pressure port 17, and in response to a command from the valve opening controller 28, the shut-off valve 12b opens and closes, and accordingly, the large flow rate switching valve. 12a operates, and the large flow rate switching valve 12
The opening degree of a and the damping coefficient c of the device according to the opening degree are adjusted and controlled.

That is, by adjusting the opening degree of the flow rate switching valve 12 and finely adjusting the connection state between the completely locked state and the completely free state, various damping coefficients c are given, and the damping coefficients c and According to the vibration state of the frame body, the natural period of the frame body and the damping constant h of the frame body at that time are given.

Further, the inflow passage 10 or the outflow passage 1
1 is provided with an accumulator 19 and the like for the purpose of compensating for volume change due to compression of hydraulic oil and temperature change.

[0011]

When the damping coefficient c of the variable damping device is changed to reduce the response of the building frame, various control laws using various parameters can be considered. With such changes, the natural frequency of each order of the column / beam structure and the entire building changes, the damping constant h also changes accordingly, and when the natural frequency of higher than 2nd order is predominant. There are various factors that complicate the rule.

On the other hand, it is possible to perform a complicated analysis by a computer based on a signal from a sensor or the like installed inside or outside the building or in a device section, but it is costly and the device is not required. Problems with the stability of the operation and control of are likely to occur.

The present invention relates to a hydraulic cylinder type damping device as disclosed in, for example, Japanese Patent Application Laid-Open No. 2-289769, which utilizes the relative movement between the cylinder and the piston due to swaying to open the valve. Provide a vibration control device that automatically adjusts.

In this device, it is not necessary to separately provide a power source and a sensor for control purpose, and passively exerts a vibration damping effect similar to that of an active vibration damping device without using energy from other sources.

[0015]

The damping coefficient automatic adjustment type damping device of the present invention converts a relative displacement speed of a piston with respect to a cylinder of a hydraulic cylinder type damping device into a rotational movement and accelerates it. A device, a generator for generating electromotive force with increased rotational movement, a rectifier for dividing the electric power obtained by the electromotive force into a circuit and control valve driving power source, and a control speed command, and converting the speed command into an acceleration command. It is composed of a differentiating circuit and an integrating circuit for converting a speed command into a displacement command. A battery may be used together with the power source for driving the control valve.

Next, how these give the optimum damping coefficient will be described.

The optimum damping coefficient c _opt is expressed by the following equation.

[0018]

[Equation 1]

K _f = rigidity of column / beam structure only K _b = rigidity of seismic element only ω _t = vibration frequency of the entire column / beam structure including seismic element at a certain time As column / beam structure and seismic element were placed braces and variable damping device, high-rise building is complex stiffness K _c of the layer when subjected to vibration sinusoidal pressure of frequency fHz is expressed by the following equation.

[0020]

[Equation 2]

Here, ω = 2πf Here, the damping constant h of the layer can be expressed by the following equation.

[0022]

(Equation 3)

In order to maximize the real part of K _R = K _c and the imaginary part h of K _I = K _c , if dh / dc = 0,

[0024]

[Equation 4]

If the ratio of the frame rigidity K _f and the brace rigidity K _b , K _b / K _f = N, then the above equation is

[0026]

(Equation 5)

It can be expressed as Therefore, it is understood that c _opt that maximizes the damping constant h of the building is determined by K _f , K _b , and ω. Of these, K _f and K _b are determined by the specifications at the time of design, so it is sufficient if the vibration frequency ω (= 2πf) can be identified.

As a method of identifying ω, if the amplitude of the device section is x = Dsin ωt, the velocity is v = ωDco
Since s ωt and acceleration a = −ω ² Dsin ωt, ω can be identified by the following equation. If the identified ω is ω _t ,

[0029]

(Equation 6)

Therefore, according to the apparatus of the present invention, the acceleration a is calculated from the differential circuit in response to the change in the response of the building every moment.
However, the displacement x can be obtained from the integrator circuit, and the initial purpose of automatically adjusting the damping coefficient can be achieved.

[0031]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The damping coefficient automatic adjustment type vibration damping device of the present invention will be described below with reference to the drawings.

FIG. 1 is one of the embodiments of the present invention. A rack 21 is attached to one end of a cylinder 2 of a hydraulic cylinder type damping device 1 as shown in FIG. 2, and a piston is engaged with the rack 21. A pinion 20 is provided on the rod 4, and a generator 23 is driven via a speed increasing gear group 22. The generator 23 is connected to a power supply for driving the circuit and the control valve, and a rectifier 24 that divides the speed command for control. In combination with the electric power of the battery 25, a part of the power becomes a circuit and a control valve driving power source, and a part of the power enters the differentiating circuit 26 and the integrating circuit 27 to accelerate a
And the displacement x are calculated, and both are automatically controlled by the valve opening controller 28 so that the hydraulic cylinder type damping device 1 exhibits the optimum damping coefficient c _opt .

[0033]

When the device of the present invention is used, the relative movement of the cylinder and the piston of the hydraulic cylinder type damping device is fed back as it is to control the hydraulic cylinder type damping device. When the optimum damping coefficient c _opt that maximizes the damping constant h by automatically obtaining the acceleration a and the displacement x corresponding to the vibration frequency ω _t at every moment is automatically obtained, and the vibration cycle of the building fluctuates, Even in situations where high-order vibrations are predominant, it is possible to maintain high damping and enhance the safety and comfort of the building.

[Brief description of drawings]

FIG. 1 is one of the embodiments of the present invention.

FIG. 2 is a diagram showing an example of a variable damping device as a hydraulic circuit diagram.

[Explanation of symbols]

1 ... Variable damping device, 2 ... Cylinder, 3 ... Piston, 4 ... Piston rod, 6 ... Hydraulic chamber, 8
... outflow prevention check valve, 9 ... inflow prevention check valve, 10 ... inflow passage, 11 ... outflow passage, 12 ... flow control valve, 15 ... inlet Port, 1
6 ... Exit port, 17 ... Back pressure port, 19 ...
・ Accumulator, 20 ・ ・ ・ Pinion, 21 ・ ・ ・
Rack, 22 ... Accelerating gear group, 24 ... Rectifier, 2
5 ... Patery, 26 ... Differentiation circuit, 27 ... Ship circuit, 28 ... Valve opening controller

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Internal reference number FI Technical display area F16F 15/02 8917-3J F16F 15/02 A 8917-3J F

Claims (1)

[Claims] 1. A column / beam frame of a structure, and a variable damping device provided in the column / beam frame, and means for amplifying relative displacement between cylinder pistons of the variable damper. Means for converting the amplified displacement velocity into signal power, a differentiating circuit for differentiating the obtained signal power to obtain an acceleration a acting on the pillar / beam structure, and integrating the signal power for the pillar / beam structure. An integrating circuit for determining the displacement x is provided, and the following equation is calculated from the acceleration a and the displacement x. A damping coefficient automatic adjustment type damping device characterized in that the vibration frequency ω _t is identified based on the above, and is fed back to the variable damping device.