JP3690077B2 - Test equipment - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an improvement in a test apparatus that tests the strength of a structure by applying a load to the structure with an actuator.
[0002]
[Prior art]
Conventionally, when testing the strength of a structure such as a building, for example, a displacement or load feedback system as shown in FIG. 3 is used. For example, in a displacement feedback system, an actuator 101 that applies a load to a place to be tested of a structure is provided. The displacement of the actuator 101 is measured by a displacement meter 102, and a target value (setting signal) of the displacement of the actuator 101 is measured. Is input from the setting signal generator 103, and the adder 104 calculates these deviations. This deviation is amplified by the amplifier 105 and then input to the PID control device 106. The PID control device 106 controls the servo valve 107 based on this input signal so that the displacement of the actuator 101 matches the setting signal. To do. In this way, the structure is given a displacement according to a preset setting signal, and the strength of the structure is measured. In the load feedback system, a load meter is used instead of the displacement meter 102 of FIG.
[0003]
By the way, in the strength test of such a structure, for example, the structure 110 that is a foundation pile of a cross-sectional inverted T-shaped building as shown in FIG. 4, for example, from two different directions (for example, a vertical direction and a horizontal direction). A test may be performed by applying a load at the same time. That is, a load is applied to the column portion 112 extending vertically upward from the substrate portion 111 of the structure 110 by the actuator A from vertically above, while a load is applied by the actuator B from the horizontal direction. In this case, by changing the load applied by the actuator B following the displacement of the actuator A (that is, the deformation of the structure 110), the column part 112 of the structure 110 is deformed in the vertical direction, and from the horizontal direction. Measure the strength when subjected to a load.
[0004]
Conventionally, when measuring the strength against such a combined load in the vertical direction and the horizontal direction, each of the actuator A and the actuator B is provided with a feedback system as shown in FIG. Then, the detection signal from the displacement meter 102 of the feedback system on the actuator A side is input to the setting signal generator 103 of the feedback system on the actuator B side, and the setting signal on the actuator B side is adjusted according to the detection signal on the actuator A side. .
[0005]
[Problems to be solved by the invention]
However, if the detection signal on the one actuator A side is input to the setting signal generating unit 103 on the other actuator B side in this way, the calculation time in the setting signal generating unit 103 which is actually a computer is only as much as the calculation time. A delay occurs in the response of the actuator B. For this reason, it is difficult to make the load of the actuator B follow the displacement of the actuator A in real time (for example, a delay of about 100 μsec to 200 μsec).
[0006]
The present invention has been made paying attention to such a problem. A deformation or a load applied to a structure by at least one of a pair of actuators is input to a digital signal processor, and a target value of the other actuator is obtained. It is an object of the present invention to provide a test apparatus that can follow the operation of one actuator with high accuracy without delay with respect to the operation of one actuator.
[0007]
[Means for Solving the Problems]
Referring to FIG. 1 showing an embodiment, the invention according to claim 1 is a test apparatus in which a specimen is loaded from different directions by a plurality of actuators 1, 2. A first feedback circuit B for controlling the one actuator 1 so that the deformation or load x of the specimen by one actuator 1 coincides with the target value x0, and the specimen by the one actuator. A digital signal processor 9 which receives a deformation or load x and outputs a target value y0 of the deformation or load y of the specimen by another actuator 2 of the plurality of actuators 1 and 2 based on the deformation or load; The deformation or load y of the specimen by the other actuator 2 is the digital signal processing program. Tsu and a second feedback circuit A for controlling the other actuator 2 so as to match the target value y0 outputted from Sa 9.
[0008]
In the section of the means for solving the above-described problems for explaining the configuration of the present invention, the drawings of the embodiments of the invention are used for easy understanding of the present invention. It is not limited.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.
[0010]
As shown in FIG. 1 as a block diagram, the test apparatus according to the present invention includes a feedback system B that controls the displacement of an actuator 1 (actuator B) and an actuator 2 (actuator A). 110), and a feedback system A that performs PID control of the load applied to 110).
[0011]
The actuator 1 on the feedback system B side applies a load in the horizontal direction to the pillar portion 112 of the structure 110 as shown in FIG. 4, for example. The displacement setting signal (target value) x0 of the actuator 1 is The setting signal generator 3 is set from the personal computer 20. On the other hand, the actual displacement x of the actuator 1 (that is, the deformation of the structure 110) x is detected by the displacement meter 4, and the deviation between the detected value x and the setting signal x0 is calculated in the adder 5. When this deviation is amplified by the amplifier 6 and input to the PID controller 7, the PID controller 7 causes the servo valve of the actuator 1 so that the displacement x of the actuator 1 coincides with the set signal (target value) x0. 8 is controlled.
[0012]
The detected displacement value x of the actuator 1 is also input to a digital signal processor 9 (hereinafter abbreviated as “DSP”). The DSP 9 calculates a target value y0 of the load applied by the actuator 2 based on the detected value x and outputs it as a digital signal. The target value y0 is, for example, between an upper limit value y0max and a lower limit value y0min as shown in FIG.
y0 = αx + β (1)
Is calculated.
[0013]
On the other hand, the actual load y applied by the actuator 2 is detected by the load cell 10, and the adder 11 calculates the deviation between the detected value y of the load and the target value y0. This deviation reaches the amplifier 13 through an ON / OFF switch 12 interposed between the DSP 9 and the amplifier 13, is amplified by the amplifier 13, and is input to the PID control device 14. Then, the PID control device 14 controls the servo valve 15 of the actuator 2 so that the load y applied by the actuator 2 matches the output y0 of the DSP 9.
[0014]
It should be noted that the target values x0 of displacement output from the setting signal generator 3 and the coefficients α and β in the arithmetic expression (1) of the target value y0 in the DSP 9 can be arbitrarily changed by operating the personal computer 20.
[0015]
Next, the operation of the test apparatus configured as described above will be described.
[0016]
First, when the structure 110 which is a specimen is deformed from the horizontal direction and the strength of the structure 110 against the deformation is tested, that is, only the actuator 1 is operated to control only the feedback system B side. In this case, the switch 12 is set to OFF (open). Thereby, while the control of the feedback system B proceeds, no signal is input to the feedback system A side, so the feedback system A does not operate and the actuator 2 does not apply a load to the structure 110.
[0017]
On the other hand, when the structure 110 is subjected to deformation from the horizontal direction and a test is performed in which a load is applied from the vertical direction according to the deformation in the horizontal direction, that is, when control combining the feedback system B and the feedback system A is performed. The switch 12 is turned on (connected). Then, the output signal αx + β of the DSP 9 based on the displacement x of the actuator 1 (that is, deformation of the structure 110) is input to the feedback system A. By controlling the load y applied by the actuator 2 using the input signal αx + β as a target value, the load control by the actuator 2 can be performed with a certain relationship as shown in FIG. The strength test of the structure 110 can be performed in the case where the deformation is applied from the horizontal direction and the load is applied from the vertical direction.
[0018]
In this case, the DSP 9 can immediately calculate the target value of the load of the actuator 2 on the basis of the detection signal of the displacement of the actuator 1 and input it to the feedback system A. It is possible to follow the control with high accuracy without delaying the control on the B side, and to apply a desired load to the deformation of the structure 110.
[0019]
As described above, the DSP 9 can easily change the coefficients α and β of the target value αx + β of the load applied by the actuator 2. That is, according to the present invention, it is possible to freely and easily change the load control condition in the feedback system A, and the degree of freedom in testing is significantly improved.
[0020]
In the above-described embodiment, an example in which the present invention is applied to a test apparatus in which a load is applied to the structure 110, which is a specimen, with two actuators 1 and 2, is shown. The present invention is not limited to the above, and the present invention applies a load to the specimen from three or more actuators in different directions, and other actuators provide the specimen according to the displacement or load applied to the specimen by one of these actuators. You may apply to the testing apparatus which feedback-controls the displacement or load given to a test body.
[0021]
In the above embodiment, in relation to the claims, one actuator is the actuator 1 (actuator B), the other actuator is the actuator 2 (actuator A), and the first feedback circuit is the feedback system B. The second feedback circuit corresponds to the feedback system A, and the specimen corresponds to the structure 110.
[0022]
【The invention's effect】
According to the present invention, the digital signal processor calculates the target value of the deformation or load of the specimen by another actuator based on the deformation or load applied to the specimen by one actuator, and this is calculated as the second feedback. Since the signal is input to the circuit, other actuators can be made to follow with high accuracy without delaying deformation or load applied to the specimen by one actuator, and the accuracy of the test can be improved. In the digital signal processor, the constant for calculating the target value of deformation or load given by another actuator can be easily changed, so that the control conditions for deformation or load by the second feedback circuit can be set. It is possible to change freely and easily, and the degree of freedom of the test is remarkably improved.
[Brief description of the drawings]
FIG. 1 is a block diagram showing an example of an embodiment of a test apparatus to which the present invention is applied.
FIG. 2 is a characteristic diagram showing the relationship between the deformation by the actuator B and the target value of the load by the actuator A. FIG.
FIG. 3 is a block diagram of a conventional test apparatus.
FIG. 4 is a cross-sectional view showing a structure that is also a specimen.
[Explanation of symbols]
1 Actuator B
2 Actuator A
3 Setting signal generator 4 Displacement meter 5 Adder 6 Amplifier 7 PID controller 8 Servo valve 9 DSP
10 Load Cell 11 Adder 12 Switch 13 Amplifier 14 PID Controller 15 Servo Valve 20 Personal Computer 110 Structure

Claims (1)

In a test apparatus that loads a specimen from different directions with multiple actuators,
A first feedback circuit for controlling the one actuator so that deformation or load of the specimen by one actuator among the plurality of actuators matches a target value;
A digital signal processor that receives deformation or load of the specimen by the one actuator and outputs deformation or load target value of the specimen by other actuators of the plurality of actuators based on the deformation or load; ,
And a second feedback circuit for controlling the other actuator so that a deformation or load of the specimen by the other actuator matches a target value output from the digital signal processor. Test equipment.

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