JP4041598B2 - Vibration control device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a vibration damping device, and more particularly to a vibration damping device configured to suppress vibration of a structure by moving an additional mass based on an output from a sensor that detects a vibration state of the structure.
[0002]
[Prior art]
For example, a structure such as a building is provided with a damping device for damping vibrations caused by an earthquake or wind pressure. In this type of vibration control device, an additional mass having a predetermined weight mainly corresponding to the mass of the building is displaced according to the vibration state of the building to suppress the vibration of the building.
[0003]
As a conventional vibration damping device, for example, an additional mass is slidably supported by a linear bearing or the like, and a transmission mechanism such as a ball screw that is screwed to the additional mass is driven by a motor or the like, so that the additional mass reciprocates horizontally. There is a damping device configured to be configured.
In this type of vibration control device, a motor as an actuator is driven and controlled by a drive signal from a control device that calculates a control amount according to the magnitude of an output value from a sensor that detects a vibration state such as the displacement and speed of a building. As the added mass moves, the vibration of the building is suppressed.
[0004]
In addition, the range of movement of the additional mass is determined in advance in the vibration damping device, and limit switches that detect that the additional mass has reached the limit position of the movement range are provided at both ends of the movement range. .
[0005]
[Problems to be solved by the invention]
However, in the vibration damping device having the above configuration, for example, when excessive vibration propagates to the structure, the output value from the sensor that detects the vibration state also becomes excessive, so control according to the magnitude of the output value. The amount may be excessive, and the amount of movement of the additional mass may exceed the movement range. As described above, when the additional mass exceeds the moving range, the limit switch is turned on to prevent the additional mass from colliding with the stopper, and the entire control system of the vibration damping device is stopped.
[0006]
For this reason, conventionally, when the additional mass stops at a position beyond the movement range, it is necessary for the operator to manually return the additional mass to a position within the movement range. There is a problem that it takes time. There is also a problem that the vibration control device does not work until the worker returns.
Accordingly, an object of the present invention is to provide a vibration damping device that solves the above-described problems.
[0007]
[Means for Solving the Problems]
In order to solve the above problems, the present invention has the following features.
The invention according to claim 1 has a calculation means for generating a drive signal based on a detection signal output from a sensor for detecting the vibration of the structure, and an actuator according to the drive signal output from the calculation means In the vibration control device that controls the vibration of the structure by moving the additional mass by driving
A limit switch for detecting that the additional mass exceeds a preset movement range ;
When the limit switch detects that the additional mass exceeds the movement range, the additional mass is stopped, and after a predetermined time has elapsed, the additional mass is automatically returned to the movement range and the calculation is performed. Control means for resuming control by the drive signal output from the means;
The is characterized in that it comprises.
[0008]
Therefore, according to the first aspect of the present invention, when it is detected by the limit switch that the additional mass exceeds the movement range, the additional mass is stopped, and after that, after a predetermined time has elapsed, the additional mass is brought into the movement range. In addition to being automatically reset, control is resumed by the drive signal output from the calculation means, so even if the additional mass stops at a position beyond the moving range, the return work is unnecessary, and the labor required for the return work by the worker Therefore, the maintenance when the additional mass is excessively displaced can be omitted, and the vibration damping state can be quickly restored.
[0009]
The invention according to claim 2 is the vibration damping device according to claim 1, wherein the control means stops the addition when the additional mass stops at a position exceeding a preset movement range. The mass is automatically returned to the center position of the moving range.
Therefore, according to the second aspect of the present invention, when the additional mass is stopped at a position exceeding the preset moving range, when the additional mass is automatically returned to the center position of the moving range, it is restarted. In addition, the movable range of the additional mass can be secured in both directions, and the vibration control operation can be performed without limiting the vibration direction.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below with reference to the drawings.
FIG. 1 is a schematic configuration diagram showing an embodiment of a vibration damping device according to the present invention. FIG. 2 is a front view of the vibration damping device. FIG. 3 is a longitudinal sectional view of the vibration damping device.
As shown in FIG. 1 to FIG. 3, the vibration damping device 1 is generally constructed by a vibration absorber 3 installed on the roof of a building 2 as a structure as a vibration control operation by a control signal from the control device 4. 2 to suppress vibration in the X direction.
[0011]
The dynamic vibration absorber 3 is configured such that the additional mass 6 slides in the X direction on the base 5 installed on the roof of the building 2, and the additional mass 6 is about 0.5% with respect to the total mass of the building 2. For example, it has a weight of about 5 to 10 t. Therefore, the additional mass 6 is slidably supported by the linear bearing 7 on the base 5.
Further, an AC servo motor (hereinafter referred to as “motor”) 8 and an electromagnetic brake 9 as an actuator are provided on the base 5, and an output shaft 8 a of the motor 8 is provided with bearings 11 and 12 via a coupling 10. Are coupled to a ball screw 13 which is supported by the shaft. The ball screw 13 is screwed into the additional mass 6 and penetrates. Accordingly, the additional mass 6 moves in the recess 5 a of the base 5 by the rotation of the ball screw 13.
[0012]
In the state before the vibration suppression operation, the center position of the additional mass 6 is set to stop at the center position (point C) that coincides with the center of the movement range. In addition, the movement range of the additional mass 6 in the recess 5a of the base 5 is determined in advance, and is set by a distance L1 in the left-right direction (X direction) around the center (point C). Left and right limit switches 15a and 15b are installed at positions moved by a distance L1 from point C). Further, stoppers 16a and 16b are provided at positions separated by a distance L2 from the attachment positions of the left and right limit switches 15a and 15b.
[0013]
The left and right limit switches 15a and 15b are turned on when the additional mass 6 moves excessively past a predetermined movement range and the end of the additional mass 6 comes into contact. When detection signals from the left and right limit switches 15a and 15b are input to the control circuit 17 of the control device 4, the control circuit 17 stops the power supply to the motor 8 and operates the electromagnetic brake 9 to stop it. As a result, even when the additional mass 6 is driven with a controlled amount exceeding the moving range, it is prevented from stopping at the position immediately before the stoppers 16a and 16b and coming into contact with the stoppers 16a and 16b.
[0014]
In addition, the control circuit (control means) 17 controls vibration suppression when an earthquake occurs, as will be described later, and once the additional mass 6 moves to a position exceeding a preset movement range, the system is temporarily stopped. Thereafter, after a predetermined time has elapsed, the motor 8 is driven to perform a return operation for returning the additional mass 6 to the center (point C) of the movement range.
For example, when the building 2 vibrates due to wind pressure or an earthquake, the control circuit 17 calculates a control amount corresponding to the magnitude of the vibration and outputs a drive signal to the motor 8 of the dynamic vibration absorber 3 as will be described later. The motor 8 rotates the ball screw 13 by supplying a drive signal, and moves the additional mass 6 in the X direction (vibration direction). At this time, the vibration of the building 2 is suppressed by the reaction of the inertial force of the added mass 6 that is generated.
[0015]
The electromagnetic brake 9 is in an off state in the vibration suppression mode, and brakes the ball screw 13 in a non-rotatable state in the stop mode when the power is turned off.
For example, a vibration state detection sensor (hereinafter simply referred to as “sensor”) 14 that detects a vibration state due to an earthquake or wind pressure based on displacement, velocity, or acceleration is installed on the odd-numbered floor and the roof of the building 2. Incidentally, these sensors 14, the buildings 2 moves X ₁ direction and outputs a positive detection signal, also become the building 2 moves X ₂ direction as the vibration direction detecting means for outputting a negative detection signal Yes.
[0016]
The dynamic vibration absorber 3 is provided with a displacement sensor 18 that detects the displacement of the additional mass 6. Incidentally, the displacement sensor 18, the additional mass 6 moves X ₁ direction and outputs a positive detection signal, so the additional mass 6 moves X ₂ direction as the moving direction detecting means for outputting a negative detection signal Yes.
The detection signals from the sensors 14 (14 _{1 to} 14 ₅ ) and the displacement sensor 18 are amplified by amplifiers 19 _{1 to} 19 ₅ and 20. The signals amplified by the amplifiers 19 _{1 to} 19 ₅ and 20 are converted into digital signals by the A / D converter 21 and output to the arithmetic unit 22. The computing device 22 computes a control amount for the dynamic vibration absorber 3 based on the digital signal input from the A / D converter 21.
[0017]
Further, the calculation result of the calculation device 22 is converted into an analog signal by the D / A converter 23 and supplied to the drive circuit 24 of the motor 8. The drive circuit 24 is driven according to the control amount calculated by the calculation device 22. The command voltage is output to the motor 8 of the dynamic vibration absorber 3 as a signal.
FIG. 4 is a block diagram for explaining the configuration of the control circuit 17.
[0018]
As shown in FIG. 4, the control circuit 17 includes a movement direction determination circuit 25 that determines the movement direction of the additional mass 6 based on detection signals from the left and right limit switches 15a and 15b, and a detection signal output from the movement direction determination circuit 25. A timer 26 which starts timing by the arrival of the detection signal, a memory 27 which stores the movement direction of the additional mass 6 by the arrival of the detection signal output from the movement direction determination circuit 25, and a detection signal output from the movement direction determination circuit 25. And a CPU 29 for automatically stopping the additional mass 6 to the center position after the supply of power to the power supply circuit 28 is stopped by the arrival of the power and the timer signal from the timer 26 is output. The memory 27 is a non-volatile memory that does not erase stored data even when power supply is stopped.
[0019]
When the additional mass 6 moves beyond a predetermined movement range, the CPU 29 recognizes the moving direction of the additional mass 6 by the incoming detection signal of one of the left and right limit switches 15a and 15b, and sends it to the drive circuit 24. Is stopped and the drive control of the motor 8 is stopped. Then, the CPU 29 controls the driving of the motor 8 via the drive circuit 24 when the timer signal from the timer 26 is output, and automatically returns the additional mass 6 to the center position. Therefore, even if the additional mass 6 stops at a position beyond the moving range, the labor and time required for the return work by the worker can be eliminated, and maintenance when the additional mass 6 is excessively displaced can be omitted. It is possible to quickly return to the vibration suppression state. Further, since the additional mass 6 is automatically returned to the center position (origin position) of the movement range, the movable range of the additional mass 6 can be secured in both directions (X ₁ and X ₂ directions) when restarted. Therefore, the vibration damping device 1 can perform a vibration damping operation without limiting the vibration direction when it is restarted.
[0020]
Here, control processing executed by the CPU 29 will be described.
FIG. 5 is a flowchart of control processing executed by the CPU 29.
In FIG. 5, in step S1 (hereinafter, “step” is omitted), when a detection signal of excessive displacement of the additional mass 6 is input from either one of the left and right limit switches 15a and 15b, the process proceeds to S2, and the drive circuit The power supply to 24 is stopped and the motor 8 is stopped. Subsequently, in S3, it is checked whether or not the acceleration calculated based on the detection amount from each sensor 14 (14 _{1 to} 14 ₅ ) is equal to or larger than a predetermined value set in advance.
[0021]
In S3, when the calculated acceleration is equal to or greater than a predetermined value set in advance, the process proceeds to S4 and waits for a certain time (for example, about 5 minutes). That is, in S4, when the timer signal from the timer 26 is output, the process proceeds to S5, and the acceleration calculated based on the detection amount from each sensor 14 (14 _{1 to} 14 ₅ ) is set to a predetermined value. Check if it is greater than or equal to the value.
[0022]
In S5, when the acceleration is equal to or greater than a predetermined value (the input is larger than the vibration suppression capability, for example, a system error is considered), the additional mass 6 moves to a position beyond the predetermined movement range. Therefore, the process proceeds to S6 and the control system of the vibration damping device 1 is stopped.
In S5, when the acceleration calculated based on the detection amount from each sensor 14 (14 _{1 to} 14 ₅ ) is smaller than a predetermined value set in advance, the moving distance of the additional mass 6 is within the predetermined moving range. Therefore, it progresses to S7. In S3, when the calculated acceleration is equal to or less than a predetermined value set in advance, the moving distance of the additional mass 6 is within the predetermined moving range, and the process proceeds to S7. In S7, the detection signals from the left and right limit switches 15a and 15b are not detected until a certain time (for example, about 5 minutes) elapses.
[0023]
Then, in S8, the movement direction of the additional mass 6 by the moving direction determining circuit 25 checks whether the direction X ₁ or X ₂ direction based on either one of the detection signals of the left and right limit switch 15a, 15b. Subsequently, the process proceeds to S9, where the vibration suppression control by the motor 8 is stopped, the power supply to the drive circuit 24 is resumed, the motor 8 is moved in the direction opposite to the detection position, and the additional mass 6 is moved to the center position (origin). Automatically return to position). At this time, the rotation speed of the motor 8 is controlled so as to be a slower movement speed than that in the vibration suppression control in which the movement speed of the additional mass 6 is, for example, about 20 cm / min.
[0024]
In the next S10, the detection of the left and right limit switches 15a and 15b is resumed. In step S11, the vibration suppression system is restarted.
As described above, when the additional mass 6 is excessively displaced, the motor 8 is stopped and the system is stopped. However, when the predetermined time elapses, the motor 8 is driven and the additional mass 6 is automatically centered. Since it can be returned to the position, labor and time required for the return work by the worker can be eliminated, maintenance when the added mass is excessively displaced can be omitted, and the vibration suppression state can be quickly returned.
[0025]
In S7, if the system does not enter the restart state even after the set time has elapsed, it is determined as abnormal and the system is stopped.
In the above embodiment, the CPU 29 has been described as realizing the return operation of the additional mass 6 by executing software. However, the present invention is not limited to this, and the configuration is realized by hardware of an electric circuit instead of the CPU 29. As good.
[0026]
FIG. 6 is a flowchart for explaining a modification of the process executed by the CPU 29.
In FIG. 6, the CPU 29 checks whether or not the output value from each sensor 14 (14 _{1 to} 14 ₅ ) is equal to or greater than a predetermined value set in advance in S21. In S21, when the output value from each sensor 14 (14 _{1 to} 14 ₅ ) is equal to or larger than a predetermined value set in advance, it is determined that the building 2 is oscillating and the process proceeds to S22, and the arithmetic device 22 Read the control amount of vibration suppression control calculated in.
[0027]
Subsequently, in S23, braking by the electromagnetic brake 9 is released. In S24, the drive control of the motor 8 is started to suppress the vibration of the building 2.
In the next S25, it is checked whether a detection signal is output from the left limit switch 15a. In S25, when the detection signal is not output from the left limit switch 15a, the process proceeds to S26 to check whether the detection signal is output from the right limit switch 15b. In S26, when the detection signal is not output from the right limit switch 15b, the process proceeds to S27 to check again whether or not the output value of each sensor 14 (14 _{1 to} 14 ₅ ) is not less than a predetermined value set in advance. To check. In S27, when the output value from each sensor 14 (14 _{1 to} 14 ₅ ) is equal to or larger than a predetermined value set in advance, the process returns to S22, and the vibration damping control process after S22 is repeated.
[0028]
However, in S27, when the output value from each sensor 14 (14 _{1 to} 14 ₅ ) is equal to or less than a predetermined value set in advance, the process proceeds to S28, where power is supplied to the drive circuit 24 and the additional mass 6 is centered. Automatically return to the position (origin position). Thereafter, in S29, the power supply to the drive circuit 24 is stopped and the motor 8 is stopped. In S30, the electromagnetic brake 9 is operated to brake the additional mass 6.
[0029]
In S25, when a detection signal is output from the left limit switch 15a, it is determined that the additional mass 6 has exceeded the limit position in the left direction, and the moving direction of the additional mass 6 is stored in S31. In step S33, the power supply to the drive circuit 24 is stopped and the motor 8 is stopped.
In S26, when a detection signal is output from the right limit switch 15b, it is determined that the additional mass 6 has exceeded the right limit position, and the moving direction of the additional mass 6 is stored in S32. In step S33, the power supply to the drive circuit 24 is stopped and the motor 8 is stopped.
[0030]
In S34, the standby state is maintained until the timer signal is output from the timer 26. When the timer signal is output after a lapse of a predetermined time, the process proceeds to S35 and the power supply to the drive circuit 24 is resumed. The motor 8 is driven and controlled. As a result, the additional mass 6 is driven in the direction opposite to the movement direction so far and automatically returned to the center position (origin position).
[0031]
In next S36, it is checked whether or not the center of the additional mass 6 has returned to the center position of the movement range. When it is confirmed in S36 that the center of the additional mass 6 has returned to the center position, the process proceeds to S37, the power supply to the drive circuit 24 is stopped, the motor 8 is stopped, and the additional mass 6 is moved to the center position. To stop.
As described above, when the additional mass 6 is excessively displaced, the motor 8 is stopped and the system is stopped. However, when the predetermined time elapses, the motor 8 is driven and the additional mass 6 is automatically centered. Since it can be returned to the position, labor and time required for the return work by the worker can be eliminated, maintenance when the added mass is excessively displaced can be omitted, and the vibration suppression state can be quickly returned.
[0032]
In the above embodiment, the vibration damping device for damping the building 2 is taken as an example. However, the present invention is not limited to this, and the dynamic vibration absorber 3 is not limited to a building (for example, a bridge, a steel tower, an elevated building, a stadium). Of course, the present invention can also be applied.
[0033]
【The invention's effect】
As described above, according to the first aspect of the present invention, when it is detected by the limit switch that the additional mass exceeds the movement range, the additional mass is stopped, and after the predetermined time has elapsed, the additional mass is moved to the movement range. Since the control is restarted by the drive signal output from the calculation means , even if the additional mass stops at a position beyond the moving range, it is not necessary to perform the return work. By eliminating the labor and time required, maintenance when the added mass is excessively displaced can be omitted, and the vibration damping state can be quickly restored.
[0034]
According to the second aspect of the present invention, when the additional mass is stopped at a position exceeding the preset movement range, the additional mass is automatically returned to the center position of the movement range, and is restarted. In addition, the movable range of the additional mass can be secured in both directions, and the vibration control operation can be performed without limiting the vibration direction.
[Brief description of the drawings]
FIG. 1 is a schematic configuration diagram of an embodiment of a vibration damping device according to the present invention.
FIG. 2 is a front view of a dynamic vibration absorber.
FIG. 3 is a longitudinal sectional view of a dynamic vibration absorber.
FIG. 4 is a block diagram for explaining a configuration of a control circuit 17;
FIG. 5 is a flowchart showing a procedure of control processing executed by a CPU 29;
FIG. 6 is a flowchart showing a procedure of a modified example of the control process executed by the CPU 29;
[Explanation of symbols]
1 damping device 2 Building 3 dynamic vibration absorber 4 controller 6 additional mass 8 AC servomotor 14 (14 ₁ to 14 ₅₎ the vibration state detection sensor 15a, 15b limit switches 16a, 16b stopper 17 control circuit 22 calculation device 25 movement direction Discriminating circuit 26 Timer 27 Memory 29 CPU

Claims (2)

Computation means for generating a drive signal based on a detection signal output from a sensor for detecting the vibration of the structure, and driving the actuator according to the drive signal output from the calculation means to move the additional mass , In a damping device for damping the vibration of the structure,
A limit switch for detecting that the additional mass exceeds a preset movement range ;
When the limit switch detects that the additional mass exceeds the movement range, the additional mass is stopped, and after a predetermined time has elapsed, the additional mass is automatically returned to the movement range and the calculation is performed. Control means for resuming control by the drive signal output from the means;
Damping apparatus characterized by comprising a. The vibration damping device according to claim 1,
The control unit is configured to automatically return the additional mass to a central position of the movement range when the additional mass stops at a position exceeding a preset movement range.

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