JPS61132835A - Temporary motion vibration-proof experimental device - Google Patents

Abstract

PURPOSE:To avoid the generation of an error of a higher order mode at the time of a response calculation, and to improve the experimental accuracy by giving an attenuation of the vicinity of the highest order mode of a response of a specimen as a larger value than others, as an attenuation term of a mathematical expression model of the specimen. CONSTITUTION:A displacement target value Xa of a specimen 1 is derived by executing a response calculation by a target value operator 5, based on a load quantity Fa of a displacement loading device 2a for giving a displacement of a prescribed vibration mode by applying a force to the specimen 1, and a mathematical expression model of the specimen 1 given from a constant setting device 6. In this case, to an attenuation term of the mathematical expression model, an attenuation factor of the vicinity of the highest order mode of a response of the specimen 1 is given as a larger value than others. Subsequently, from a displacement target value Xa and a displacement quantity Ya of the specimen 1, a displacement command value Va given to the specimen 1 is calculated by a displacement controller 7, and also based on a deviation of said value and a displacement quantity Wa of the displacement loading device 2a, a load quantity is controlled.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a temporary seismic test device that applies force to a test object such as a structure to cause displacement in a predetermined vibration mode corresponding to seismic waves, etc. This invention relates to an improvement in means for calculating a target displacement value of a body.

(Prior Art) In this type of conventional pseudo-motion seismic testing equipment, a response is calculated based on the load amount of a displacement loading device that applies force to a test object such as a structure to displace it, and a mathematical model of the test object. It was supposed to perform calculations and calculate the zero displacement target value.In this case,
The damping term of the mathematical model of the test piece used for the above response calculation is:
It was set to a relatively small value, about the level of attenuation that is normally considered.

[Problem that the invention seeks to solve]

However, in the above-mentioned conventional temporary motion seismic test equipment, if a regular error occurs in the direction of application, such as an undershoot error, in the displacement loading device, this error may cause the calculation result to change during response calculation. There was a risk of higher-order mode errors occurring.

Therefore, even if regular errors occur in the applied direction in the displacement loading device, there is no risk of higher-order mode errors occurring during response calculation to determine the displacement target value, and the experimental accuracy can be improved. The purpose of this project is to provide a temporary seismic test device that can be measured.

[Means for solving problems]

The present invention is characterized by taking the following measures in order to solve the above problems and achieve the objects.

That is, based on the load amount by a displacement loading device configured to apply force to a test object such as a structure and give displacement in a predetermined vibration mode, and the mathematical model of the test object given by a constant setting device. , a response calculation is performed by a target value calculator to calculate a displacement target value of the test object. At this time, the damping ring in the mathematical model of the test object is given a damping rate near the highest mode of the test object response that is larger than the other values. Then, a displacement controller calculates a displacement command value to be given to the test body based on the displacement target value that is the output of the target value calculator and the displacement amount of the test body;
The present invention is characterized in that the load amount of the displacement loading device is controlled based on the deviation between the displacement command value that is the output of the displacement controller and the displacement amount of the displacement loading device.

[Effect]

By taking the above measures, even if regular errors occur in the displacement loading device in the direction of force applied by the amplifier, chute, etc., higher-order mode errors will be avoided when calculating the response to determine the displacement target value. This can be avoided.

〔Example〕

Embodiments of the present invention will be described below with reference to the drawings.

The figure is a block diagram showing the configuration of an embodiment of the present invention.

In the figure, 1 is a test object such as a structure.

Reference numerals 2a and 2b are two displacement loading devices that apply a force to the test specimen 1 to give it displacement in a predetermined vibration mode, and in this embodiment, a hydraulic shirt is used. 3a and 3b are load detectors that respectively detect the amount of load on the test specimen 1 by the displacement loading devices 2a and 2b, and their outputs fa, zl)G;t are digitally converted by A/D converters 4a and 4b. and is supplied to the target value calculator 5 as digital load signals Fa and Fb. The target value calculator 5 is provided with an output from the constant setter 6, that is, a mathematical model of the test object 1 consisting of a mass matrix, an attenuation matrix, and a test input (seismic wave) of the test object 1. Thus, in the target value calculator 5, a response calculation is performed based on the digital load signals Fa, Fb and the mathematical model, and the displacement target values Xa, Xb of the test body 1 are calculated. The displacement target values Xa and Xb are sent to the displacement m unit 7.

On the other hand, outputs Ya and Yb of first displacement detectors 8a and 8b for detecting the amount of displacement of the test object 1 are also supplied to the displacement controller 7. Thus, in the displacement controller 7, the displacement loading devices 2a, 2b are controlled based on the outputs Xa, xb of the target value calculator 5 and the outputs ya, yb of the first displacement detectors 8a, 8b. Displacement command values Va and Vb to be given to the test object 1 are calculated.

The displacement command values Va and Vb are provided by the D/A converter 9a.

After being converted into analog signals va and vb at 9b, they are supplied to one input terminal of the addition/subtraction a1oa and iob. The above adder/subtractor 10a.

The other input terminal of 10b is connected to the displacement loading device 2a,
A second displacement detector 11a, 1 detects the amount of displacement of 2b.
Outputs wa and vyb from 1b are supplied. Thus, in the adder/subtractor 10a, 10b, each of the outputs va
, vb and the deviations of wa, wb are calculated. The outputs of the adders and subtracters 10a and 10b are supplied to the displacement loading devices 2a and 2b via voltage amplifiers 12a and 12b.
supplied to The displacement loading devices 2a and 2b convert an electric signal given by an electro-hydraulic conversion mechanism (not shown) into hydraulic pressure, apply a predetermined load to the test specimen 1, and displace it.

Incidentally, the attenuation matrix in the mathematical model of the test specimen 1 set by the constant setter 6 is designed to intentionally give a large attenuation rate near the highest mode of the test specimen response.

Thus, according to this embodiment, the displacement loading devices 2a, 2b
Even if a regular error such as an undershoot error occurs in the applied force direction, there is no risk of higher-order mode errors occurring during response calculation in the target value calculator 5 as in the prior art. Therefore, the accuracy of the pseudodynamic extension test can be improved.

Note that the present invention is not limited to the above embodiment.

For example, in the above embodiment, two displacement loading devices are provided, but the number is not limited to two, and a single displacement loading device or three or more may be provided. It goes without saying that various other modifications can be made without departing from the gist of the present invention.

〔Effect of the invention〕

According to the present invention, attenuation near the highest mode of the response of the test body is used as a subtraction term in the mathematical model of the test body given to a target value calculator that calculates a target displacement value of the test body by performing response calculation. Since the ratio is given as a larger value than the others, even if a regular error occurs in the applied direction in the displacement loading device,
There is no risk of higher-order mode errors occurring during response calculations to determine displacement target values (and a pseudo-seismic seismic experimental device that improves experimental accuracy can be provided).

[Brief explanation of drawings]

The figure is a block diagram showing the configuration of an embodiment of the present invention. 1... Test specimen, 2a, 2b... Displacement loading device, 3a
. 3b...Load detector, 4a, 4b/A/D converter, 5
...Target value calculator, 6...Constant setter, 7...Displacement controller, 8a, 8b-...First displacement detector, 9a,
9b O/A converter, 10a, 10b...addition/subtractor, 11a, 11b...second displacement detector, 128.
12b...power amplifier.

Claims (1)

[Claims] A displacement loading device that applies force to a test object such as a structure to cause displacement in a predetermined vibration mode, and a method that sets a damping rate near the highest mode of the test object response larger than others as a damping term in a mathematical model of the test object. A response calculation is performed based on a constant setter that is given as a value, a mathematical model of the test body given by this constant setter, and a load amount by the displacement loading device, and a target displacement value of the test body is calculated. a target value calculator; a displacement controller that calculates a displacement command value to be given to the test piece based on the displacement target value that is the output of the target value calculator and the displacement amount of the test piece; and this displacement control. 1. A pseudo-seismic seismic testing device comprising: control means for controlling the load amount of the displacement loading device based on the deviation between the displacement command value that is the output of the device and the displacement amount of the displacement loading device.