JPH07306115A - Vibration tester for structure, method for testing vibration of structure and structure thereof - Google Patents

Abstract

PURPOSE:To make it possible to perform the accurate vibration test by outputting a vibrating signal for vibration response at the time earlier than the response time of a vibrator, and making the vibrating time of a structure and a reaction measuring time agree. CONSTITUTION:External force, which is applied on a structure, is sequentially inputted into a vibration-response computing block 11 from an external-force input block 14. The block 11 computes the vibration response after a constant time DELTAt by the vibration-response analyzing method based on the numerical-value model of the structures other than the structure 2 under test. A vibrating-signal forming block 12 forms the vibrating signal based on the response. At this time, a response-delay computing block 13 compares the vibrating signal value from the block 12 and the measured displacement value from a displacement measuring means 10 and computes the response delay sigma at a vibrator 7. Then, the vibrating signal corresponding to the vibration response after the constant time DELTAt computed with the block 11 is outputted at the time earlier than the delay time sigma from that time. As a result, the displacement to be realized can be realized at the time for the realization.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vibration test method for a structure and an apparatus therefor, and more particularly to a structure in which a vibration test of only a part of a structure and a vibration response numerical analysis of another part are combined in real time. Vibration test method, apparatus therefor, and structure.

[0002]

2. Description of the Related Art In a normal vibration test of a structure, the entire target structure is mounted on a vibration table and vibrated. On the other hand, if the target structure becomes large, the load limit of the vibrating table may be exceeded. In such a case, the reduced model test or the partial model test is adopted. However, for structures such as non-linear structures where it is difficult to establish a similarity rule or structures with large vibration coupling with surrounding structures, the above-mentioned reduction or the shaking table test using a partial model is not accurate. Could be. To solve this,
A vibration test method for a structure has been considered in which a vibration test of only a part of the structure by a vibration exciter and a vibration response numerical analysis of another part are combined. This test method is called "quasi-dynamic test" or "pseudo-dynamic test",
For example, the Architectural Institute of Japan, Report No. 229 (Showa 50)
(Year) An example of the system is described on pages 77 to 83. Further, JP-A-61-34438 and JP-A-61-132835
And Japanese Patent Application Laid-Open No. 62-220831. The central difference method is used for numerical calculation in these test devices.

A quasi-dynamic test using the central difference method will be described below. Now, as shown in FIG. 2, of the structure 1, only a part 2 is an actual vibration test target, and the other part 3 is a vibration response numerical analysis target. The equation of motion of this analysis target part 3 is

[Equation 1] Can be written. However, M is a mass matrix, C is a damping matrix, K is a stiffness matrix, x is a displacement vector, f is an external force vector, and q is a reaction force vector. It is considered that (Equation 1) is numerically solved at fixed time intervals Δt. Since (Equation 1) holds at a certain time t _i , the subscript i
When the value of time t _i is expressed by

[Equation 2] Is. Here, time t _i-1 = t _i −Δt and time t _{i + 1} = t _i
It is assumed that the acceleration is constant between + Δt. Then,

[Equation 3] Is obtained. Substituting (Equation 3) into (Equation 2) and solving for x _{i + 1} ,

[Equation 4] Becomes This is the central difference method, the displacement vector x _i-1, x _i at time t _i-1 and the time t _i, the external force vector f _i at time t _i, the value of the reaction force vector q _i, the time t _{i + 1} Displacement vector x _{i + 1} of

Next, a quasi-dynamic test using the central difference method will be described. FIG. 3 shows the apparatus configuration of the test, and the above-mentioned vibration response analysis is performed by the computer 5. The external force vector is, for example, seismic force, and is input in a normal vibration test for vibrating the entire structure, and is stored in the computer in advance or is input from a different device to the computer at each time and generated. The reaction force vector is calculated from the calculation result (displacement vector at t _i ) at time t _{i−1 in} the computer 5,
A drive signal of relative displacement of both ends (2a, 2b) of the test object structure 2 (displacement of the boundary point 2a itself with the structure 3 when the test object structure 2 is fixed to the foundation 4) is output, The signal is input to the vibration exciter control device 6, and the reaction force wall 9
Is added to the structure to be tested 2 by the vibrator 7 fixed to
The reaction force with respect to the displacement is measured by the reaction force measuring means 8 such as a load cell attached to the vibration exciter driving unit 7a, and is taken into the computer. In this way, since the data at time t _i is obtained, the displacement vector at time t _{i + 1} can be calculated by (Equation 4). By the above method, a part of the vibration test can be performed while considering the influence of the vibration response of the entire structure, and the vibration response of the entire structure can be evaluated.

[0005]

In the quasi-dynamic test, the time axis in the vibration test is greatly extended, and only the reaction force related to the displacement is used in the vibration response analysis. However, it is insufficient when the reaction force of the structure under test includes a time-dependent term (reaction force related to velocity or reaction force related to acceleration). That is, it is necessary to match the time axis in the vibration response calculation with the time axis in the vibration test to perform vibration.

Therefore, a real-time vibration test apparatus and method as described in JP-A-5-10846 have been considered. This real-time vibration is calculated by calculating the vibration response after a certain time from the reaction force measurement time in a computer that performs vibration response analysis, and applying a vibration generator drive signal to realize the vibration response after the certain time. It becomes possible by outputting to the control device of the shaker.

However, the vibration exciter used in the vibration test apparatus is, for example, a hydraulic exciter, and it is inevitable that a slight delay occurs in the actual displacement response with respect to the drive signal. In addition, this response delay is not constant but generally fluctuates due to various factors (frequency, amplitude, etc.).

The influence of the response delay of the vibration exciter on the vibration test will be described below. Now, it is assumed that the displacement x to be applied to the vibration test target structure is a sine wave. That is,

[Equation 5] However, A is the amplitude and ω is the circular frequency. If there is a response delay δ of the shaker and the structure under test is a linear spring with a spring constant k, the reaction force q input to the calculator is

[Equation 6] Call The energy variation qE for this element in one period of oscillation is

[Equation 7] Becomes That is, an increase in energy occurs in proportion to the delay time δ. Expressing this energy fluctuation as an equivalent damping coefficient Ceq,

[Equation 8] Becomes If this negative damping is greater than the original damping of the structure under test, the vibration will gradually increase and divergence will occur.
Further, even when divergence does not occur, the vibration response cannot be accurately obtained because the damping differs from the original value. The technique disclosed in Japanese Patent Laid-Open No. 5-10846 does not deal with this problem.

An object of the present invention is to provide a vibration test method for a structure which does not cause divergence in the vibration response analysis and allows accurate tests even if the vibration exciter has a response delay depending on the amplitude and frequency. And its device and structure.

[0010]

[Means for Solving the Problems] The above-mentioned object is to model a part of a structure with a real object and to model another part with a numerical model, and the real modeled part is a reaction force from the real object model to the vibration exciter. Excitation is performed by one or a plurality of exciters equipped with a reaction force measuring means for measuring, and the numerical model of the other part is incorporated in a computer as a vibration response calculation program, and the reaction force measuring means is added to the computer. By sequentially inputting the measured value of the reaction force measured by and the external force value applied to the structure, the vibration response calculation program calculates the vibration response of the numerically modeled part after a certain time from the reaction force measurement time. Then, in the vibration testing method of the structure which repeatedly executes the operation of generating the vibration signal of the vibration exciter based on the calculated value and vibrating the real model, the real model is excited by the vibration of the vibration exciter. In addition to Calculate the displacement measurement value and the vibration signal value input to the vibration exciter to calculate the response delay time of the vibration exciter, and subtract the calculated response delay time from the above fixed time. This is achieved by applying a vibration signal corresponding to the vibration response after the fixed time to the vibration exciter at the time after the reaction force measurement time, and by the vibration of the vibration exciter, an actual model can be obtained. Calculate the corrected value of the response delay time of the vibration exciter by comparing the measured value of the displacement added to the above with the vibration response calculation value, and subtract the preset vibration exciter response delay time from the above fixed time. When the elapsed time has elapsed from the reaction force measurement time, an excitation signal corresponding to the vibration response after the certain time is applied to the exciter, and the set exciter response delay time is corrected by the correction value. It is achieved by The vibration signal is achieved by periodically applying the time to the vibration exciter with a time period smaller than the constant time, and is achieved by configuring the vibration response calculation means with a digital computer, and This is achieved by connecting an external device for inputting the numerical model of the second part to the computer equipped with the vibration response calculation means, and when there are a plurality of the vibration exciters, This is achieved by providing the above-mentioned vibration signal generation means and vibration-motor response delay calculation means for each vibration machine.

[0011]

[Function] Since the vibration signal for the vibration response to be realized at a certain time is output earlier by the vibration generator response time, the time when the structure is actually vibrated by the vibration generator and the reaction force measurement time , And there is no problem such as oscillation due to response delay, and an accurate vibration test can be performed. In addition, by calculating the correction value of the response delay time of the shaker from the measured value of the above displacement and the vibration response calculation value added to the actual model by the shaker, the shaker response delay time is compensated. Can perform accurate tests. Also, at least the computer that outputs the excitation signal is a digital computer, and the excitation signal is output in advance before the actual time to be realized by making the time step of the excitation signal output smaller than the above fixed time. The time accuracy can be improved. Also, by using a digital computer as the computer on which at least the vibration response calculation program is installed, it becomes possible to easily input various numerical models to the computer and conduct experiments, and to use the vibration test device in a wide range of structures. Will be applicable to. Also, by connecting an external device for inputting a numerical model to a computer equipped with a vibration response calculation program, it becomes easy to input the numerical model into the computer, which facilitates model change and vibration. The test apparatus can be applied to a wide range of structures. In addition, when multiple exciters are installed, by providing an exciter signal generation means and an exciter response delay calculation means for each exciter, the exciter response delay for a plurality of exciters is increased. Can be performed in parallel and the processing for generating the excitation signal can be performed in parallel, and the time required for these operations can be shortened, so that it can be easily applied to a complex structure.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIG. First, the configuration of this embodiment will be described. The structure 2 to be tested among the structures 1 is fixed to the foundation 4. An exciter 7 fixed to the reaction wall 9 and controlled by the controller 6
Can apply a displacement to the object 2 via the drive unit 7a. A reaction force measuring means 8 is installed in the drive unit 7a of the shaker, and measures the reaction force from the test target structure 2 to the shaker 7 when the test target structure 2 is displaced. it can. Further, the vibration exciter 7 is provided with a measuring unit 10 for measuring displacement due to vibration.

The computer (or computer group) 5 is equipped with a vibration response calculation block 11, a vibration signal generation block 12, a response delay calculation block 13, and a vibration signal external force data input block 14. Further, a time management means 15 for managing the working time of the work of these blocks is also installed. Further, the external force data input block 14 to the vibration response calculation block 11, the vibration response calculation block 20 to the excitation signal generation block 12, and the response delay calculation block 1
3 to the excitation signal generation block 12, and the excitation signal generation block 12 to the response delay calculation block 13 are provided with data transmission means 19 to 22, respectively.

All of these blocks 11 to 14 may be mounted on one computer. Alternatively, they may all be installed in different computers. Alternatively, some blocks may be mounted together in one computer, and the test device may be configured by a plurality of computers as a whole. In short, the computer or the computer group may have any configuration as long as the functions described below can be implemented. Further, the computer may be a digital computer, an analog computer, or a hybrid computer in which both are combined. In this respect as well, the computer or the computer group may have any configuration as long as the functions described below can be implemented. Further, the data transmission means is, for example, a data bus or the like in the case of a digital computer, a cable for transmitting a voltage signal in the case of an analog computer, and
An A / D converter or a D / A converter may be installed at the input / output of the block. In short, the transmission means may be configured in an appropriate form according to the configuration of the computer or the computer group.

A transmission means 16 for transmitting the reaction force measurement value from the reaction force measuring device 8 to the vibration response calculation block 11 is installed. Further, transmission means 18 for transmitting the displacement measurement value from the displacement measurement means 10 to the phase delay calculation block 12 is installed. In addition, from the excitation signal generation block 12 to the control device 6
A vibration signal transmission means 17 is installed in the. These transmitting means take various forms depending on the configuration of the computer or the computer group, the type of the measuring means, and the like. In short, any configuration may be used as long as the functions described below can be performed.

Next, the procedure for carrying out the vibration experiment according to this embodiment will be described. Structures other than the target structure 2 on which the actual vibration test is performed are numerically modeled and input to the vibration response calculation block 11. Further, the external force such as an earthquake applied to the structure 1 is sequentially input to the vibration response calculation block 11 from the external force data input block 14 through the external force data transmission unit 19 under the control of the time management unit 15. .

In the vibration response calculation block 11, a method such as the central difference method described in the section of the prior art is programmed, and the numerical value of the portion 3 of the structure 1 excluding the structure 2 to be tested is programmed. The model is input, and the vibration response after a certain time Δt is calculated. For the central difference method,
The vibrational response is displacement. However, the vibration response analysis method is not limited to the central difference method, various methods can be used, and the vibration response to be calculated is not limited to displacement, and may be velocity, acceleration, or the like.

The vibration signal generation block 12 generates a vibration signal based on the vibration response calculation result of the vibration response calculation block 11. For example, when the experiment of the structure 1 shown in FIG. 2 is performed by vibrating the real model of the partial structure 2, the displacement of the point 2 a obtained by the numerical model of the structure 3 is modeled by the vibrating machine 7 by the vibrating machine 7. Add to. When generating this excitation signal, the response delay calculation block 13 knows the response delay time δ of the vibration exciter, as will be described later. Therefore, as shown in FIG.
The vibration signal corresponding to the vibration response calculated by the vibration response calculation block 11 after the fixed time Δt may be output earlier by the delay time δ than that time. Then,
As shown in, the desired displacement can be realized at the desired time. That is, from the reaction force measurement time, a fixed time Δt
After the time of subtracting the exciter delay time δ from, a vibration signal corresponding to the vibration response after a fixed time Δt is output.

To the response delay calculation block 13, the vibration signal value is input from the vibration signal generation block 12 through the vibration signal transmission means 21. Further, the measurement value of the vibration displacement by the vibration exciter 7 is input from the displacement measuring means 10 to the response delay calculation block 13 through the displacement measurement value transmitting means 18. The response delay calculation block 13 calculates the response delay of the vibration exciter 7 by comparing the vibration signal value and the displacement measurement value. The calculation method is performed as follows, for example.

As shown in FIG. 6, the excitation signal value x is an amplitude A, a sine wave with a circular frequency ω, the displacement measurement value y is an amplitude A, a sine wave with a circular frequency ω, and is delayed by δ from the excitation signal value x. Suppose that
Ie

[Equation 9]

[Equation 10] When these two signals are drawn on the xy plane, the elliptical shape in FIG. 7 is obtained, and the area I in the ellipse is obtained by integrating xdy over one cycle and represents the energy generated due to the delay time.

[Equation 11] Therefore, the delay time δ is obtained by measuring the integral I, the amplitude A, and the circular frequency ω by these equations. Also,
The same processing may be performed every half cycle. Alternatively, it can be calculated by obtaining a cross-correlation function of the excitation signal value x and the displacement measurement value y.

The above-described procedure is summarized in a flowchart as shown in FIG. The reaction force is taken in from the reaction force measuring means 8 (step 801), and the external force data input block 14
External force data is received from (step 802), and the vibration response calculation block 11 uses these to obtain the vibration response (step 803). Next, the response delay calculation block 13 obtains the vibration exciter delay time δ from the displacement and the vibration response (step 804), and the vibration signal generation block 12 generates the vibration signal from the vibration exciter delay time δ and the vibration response calculation value. Is generated (step 805). The vibration signal generated in this way is given to the vibration exciter 7 to vibrate the test object, and the reaction force and external force data are taken in again at the next processing time (steps 801, 80).
2), the following processing is repeated until the end condition is satisfied. The termination conditions are set in advance with respect to the elapsed time, the number of processing times, and the like.

In this embodiment, the vibration response calculated by the vibration response calculation block 11 is a value after a fixed time Δt, but since the response delay of the vibration exciter is δ, Δt>
It is desirable to set the fixed time Δt so as to be δ.
This is because if this relationship does not hold, it will be impossible to completely cancel the delay of the vibration exciter. Usually, the approximate value of the response delay of the vibration exciter can be predicted in advance, so it is easy to determine the fixed time Δt.

According to this embodiment, since the displacement of the vibration exciter can be matched with the time axis of the vibration response analysis means, it is possible to avoid an increase in energy due to the vibration response of the vibration exciter in the vibration response calculation. The vibration test of the structure can be carried out stably and accurately. Further, according to the present embodiment, the response delay time of the exciter can be corrected every one cycle or half cycle, and the excitation signal can be output earlier by the delay time. A vibration test with high accuracy can be performed.

Next, another embodiment will be described with reference to FIG. In this embodiment, the data transfer means 22 from the vibration signal generation block 12 to the response delay calculation block 13 in the embodiment of FIG. 1 is replaced with a data transfer means 23 from the vibration response calculation block 11 to the response delay calculation block 13. Is provided. In this embodiment, the response delay calculation block 13 does not calculate the response delay δ of the vibration exciter itself, but calculates the error β between the response delay currently used and the actual response delay. The calculation method is different only in that the vibration response calculation value is used instead of the vibration signal value of (Equation 9) to (Equation 11), and that the result is an error β of the vibration exciter response delay. Only. A response delay time of the vibration exciter is set in advance in the vibration signal generation block 12, and the delay time is corrected using the error β as a correction value.

Also in this embodiment, since the displacement of the vibration exciter can be matched with the time axis of the vibration response analysis, it is possible to avoid an increase in energy due to the delay of the vibration exciter response in the vibration response calculation, and the structure The vibration test can be performed stably and accurately. Similarly, according to this embodiment, the response delay time of the vibration exciter can be corrected every one cycle or half cycle, and the vibration signal can be output earlier by the delay time. It is possible to perform vibration tests with high accuracy.

Another embodiment of the present invention will be described with reference to FIG. In this embodiment, the vibration response calculation block 11 in the embodiment shown in FIG. 1 is installed in a digital computer 24 different from the computer 5. According to the present embodiment, even if the part to be numerically modeled is a very complicated model, the mass matrix, the stiffness matrix, etc., can be input in the form of digital values, so the input is easier than in an analog computer. Become.
Also, the same test apparatus can be applied to various structures. Further, this embodiment can be applied to the embodiment shown in FIG.

In FIG. 10, the digital computer 24 is shown as being independent of the computer in which other blocks are mounted, but other blocks may be mounted in the digital computer 24. At least, if the vibration response calculation block 11 is installed in the digital computer, the configuration of the other blocks can take various forms.

Another embodiment will be described with reference to FIG. In this embodiment, an external device 25 for data input is connected to the digital computer 24 of the embodiment shown in FIG. The external device 25 is, for example, a keyboard or a display.
According to this embodiment, since it is easy to input the numerical model,
The test device can be applied to a wide range of structures. Further, this embodiment can be applied to the embodiment shown in FIG.

Another embodiment will be described with reference to FIGS. In the present embodiment, as shown in FIG. 12, the computer equipped with the excitation signal calculation block 12 in the embodiment of FIG. 1 is a digital computer 26, and as shown in FIG. The step is smaller than the time from the reaction force measurement time of the vibration response calculation calculated by the vibration response calculation block. According to the present embodiment, complicated processing such as extrapolation and interpolation can be easily performed in creating a vibration signal, and since the time step is reduced, the accuracy of canceling the response delay of the vibration exciter becomes high, and high accuracy is achieved. Experiment becomes possible.

In FIG. 12, the digital computer 26 is shown as being independent of the computer in which other blocks are installed, but other blocks may be installed in the digital computer 26. If at least the excitation signal generation block 12 is installed in the digital computer, the configuration of the other blocks can take various forms.

In the above embodiments, the case where the structure to be tested and the vibration exciter are one set has been shown, but the present invention can be applied even if they are plural sets. In that case, the response delay calculation block 13 and the excitation signal generation block 12 are required for each exciter. An embodiment in the case of a plurality of shakers will be described with reference to FIG. Now, when a block composed of the foundation 4, the reaction force wall 9, the vibration exciter 7 and the like is collectively referred to as a vibration table, a response delay calculation block 13 and a vibration signal generation block are provided to the respective vibration tables K1 to KN. It is provided with twelve installed computers 27. Note that FIG.
In FIG. 4, the drawings from the shaking table K2 to the shaking table K (N-1) are omitted, and the same reference numerals are used for the respective parts of each shaking table and the computer 27.

The operation of this embodiment is shown in the flow chart of FIG. When the calculation of the vibration response is completed in steps 1501 to 1503, the result is distributed to each of the computers 27, and within each computer 27, the calculation of the vibration response delay of the corresponding vibration table (step 1504-j) is performed. The generation of the vibration signal (step 1505-j) is executed in parallel. However, j is the number of the vibration table, and j = 1 to N. in this way,
Since the calculation of the response delay of each exciter and the generation of the excitation signal based on it can be performed in parallel for each computer, the calculation processing time can be shortened. Therefore, as shown in FIG. 16, the response delay of the exciter is reduced. Can be expanded, or the time from the reaction force measurement time of the vibration response obtained by the vibration response calculation can be shortened, and the calculation accuracy can be improved. Note that, in FIG. 15 as well, the view from the shaking table K2 to the shaking table K (N-1) is omitted.

In the above embodiment, the response delay calculation block 13 and the excitation signal calculation block 12 may be installed in different computers. Further, these blocks may be mounted in different CPUs on one or a plurality of parallel computers. In short, it is only necessary that the above-described processing for each vibration exciter can be performed in parallel.

The external force data input block 14 of the above-mentioned embodiment will be described below. The function of the external force data input block 14 is to sequentially input external force data such as seismic force to the vibration response calculation block 11. There are various ways to construct this block. For example, when the vibration response calculation block 11 is a digital computer, the time history numerical value data of the external force may be input in advance in the array in the calculation program and sequentially read and used for calculation.

Further, as shown in FIG. 17, the computer on which the external force data input block 14 is mounted is a digital computer 2.
8, an internal storage device 29 for storing external force data is provided in the computer, and the data is sequentially read while being managed by the time management means 15, converted into a form corresponding to the vibration response calculation block 11, and output. . Depending on the configuration of the computer equipped with the external force data input block 14 and the vibration response calculation block 11, the output form may be an analog signal from a D / A converter or a digital signal transferred via a data bus. Or Also, FIG.
As shown in FIG. 8, if the computer 28 is provided with an external device 30 such as a display and a keyboard to facilitate data input, it becomes easy to perform a test on various input data.

Further, as shown in FIG. 19, external force data may be, for example, data measured at the same time as the test is performed or data measured as an analog signal, and this signal may be input to the vibration response calculation block 11. Conceivable.
At this time, when the computer in which the vibration response calculation block 11 is installed is a digital computer, the time management unit 15 manages the digital data and the A / D converter 31 sequentially converts the digital values.

In the above embodiments, the vibration by the vibration exciter was translation in one direction. However, depending on the structure to be tested and the numerical modeling, even in the case of rotation or in a plurality of directions. May be applied, or a combination of translation and rotation may be used.

[0038]

According to the present invention, the divergence of the vibration response analysis due to the response delay of the vibration exciter does not occur, and the vibration test of only a part of the structure and the vibration response numerical analysis of the other part are combined in real time. There is an effect that the vibration test of the structure to be performed can be performed stably and accurately.

[Brief description of drawings]

FIG. 1 is a block diagram showing an embodiment of an apparatus of the present invention.

FIG. 2 is a diagram showing an example of a target structure of a vibration test.

FIG. 3 is a schematic system diagram of a vibration test of a structure which is performed by combining a vibration test of only a part of the structure and a vibration response numerical analysis of another part.

FIG. 4 is an explanatory diagram of a shaker response delay calculation method.

FIG. 5 is an explanatory diagram of a shaker response delay calculation method.

FIG. 6 is an explanatory diagram of a shaker response delay calculation method.

FIG. 7 is an explanatory diagram of a shaker response delay calculation method.

FIG. 8 is an operation flowchart of the embodiment of FIG.

FIG. 9 is a block diagram showing another embodiment of the device of the present invention.

FIG. 10 is a block diagram showing another embodiment of the device of the present invention.

FIG. 11 is a block diagram showing another embodiment of the device of the present invention.

FIG. 12 is a block diagram showing another embodiment of the device of the present invention.

13 is an explanatory diagram of an excitation signal generation method in the embodiment of FIG.

FIG. 14 is a block diagram showing another embodiment of the device of the present invention.

15 is an operation flowchart of the embodiment in FIG.

FIG. 16 is an explanatory diagram of effects of the embodiment of FIG.

FIG. 17 is a diagram showing an example of an external force data input block.

FIG. 18 is a diagram showing an example of an external force data input block.

FIG. 19 is a diagram showing an example of an external force data input block.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 structure 2 structure to be tested 3 structure to be simulated 4 foundation 5 computer or computer group 6 controller for vibration exciter 7 vibration exciter 8 reaction force measuring means 9 reaction force wall 10 displacement measuring means 11 vibration response calculation block 12 Excitation signal generation block 13 Excitation device response delay calculation block 14 External force data input block 15 Time management means 24 Digital computer equipped with vibration response calculation block 25 External device 26 Digital computer equipped with excitation signal generation block 27 Response delay calculation Digital computer with block and excitation signal generation block 28 Digital computer with external force data input device 29 Internal storage device 30 External device 31 A / D converter

Claims (10)

[Claims] 1. A structure to be tested is divided into a first part and a second part, one or a plurality of vibrators for exciting the first part, and a controller for the shaker. Reaction force measuring means for measuring a reaction force applied to the vibration exciter from the first portion attached to the vibration exciter, and for measuring a displacement applied to the first portion by the vibration exciter. Displacement measuring means, external force data input means for taking in external force data for generating vibration, and a numerical model for simulating the vibration of the second portion, using the measured value of the reaction force measuring means and the external force. A vibration response calculation unit that receives the external force data from the data input unit and calculates the vibration response of the second portion after a predetermined time has elapsed from the time when the reaction force measurement value was measured; Input the vibration response calculation value of The excitation signal generating means for generating an excitation signal for driving the exciter, the measurement value of the displacement measuring means, and the excitation signal value generated by the excitation signal generating means are input to the excitation signal. Response delay calculating means for calculating the response delay time of the shaker, from the time when the reaction force measurement value was measured, when the time obtained by subtracting the response delay time of the vibrator from the constant time has elapsed, A vibration testing apparatus for a structure, comprising: a time management unit that controls to generate and output a vibration signal corresponding to a response calculation value after the fixed time. 2. A structure to be tested is divided into a first part and a second part, and one or a plurality of vibrators for exciting the first part, and a controller for the vibrator. Reaction force measuring means for measuring a reaction force applied to the vibration exciter from the first portion attached to the vibration exciter, and for measuring a displacement applied to the first portion by the vibration exciter. Displacement measuring means, external force data input means for taking in external force data for generating vibration, and a numerical model for simulating the vibration of the second portion, using the measured value of the reaction force measuring means and the external force. A vibration response calculation unit that receives the external force data from the data input unit and calculates the vibration response of the second portion after a predetermined time has elapsed from the time when the reaction force measurement value was measured; Input the vibration response calculation value of A correction value of the response delay time with the input of the vibration signal generation means for generating a vibration signal for driving the vibration exciter, the measurement value of the displacement measurement means and the vibration response calculation value by the vibration response calculation means. And a response delay calculating means for correcting the response delay time set in the excitation signal generating means, and a time from the time when the reaction force measurement value was measured, calculated by the response delay calculating means from the fixed time. When a time obtained by subtracting the response delay time that has passed is elapsed, a time management unit that controls so that an excitation signal corresponding to the response calculation value after the fixed time is generated and output is provided. Vibration tester for structures. 3. The vibration test apparatus for a structure according to claim 1, wherein the vibration response calculation means is composed of a digital computer. 4. The external device for inputting the numerical model of the second portion is connected to the computer equipped with the vibration response calculation means. Vibration tester for structures. 5. The vibrating machine according to claim 1, wherein when there are a plurality of vibrating machines, the vibrating signal generating means and the vibrating machine response delay calculating means are provided for each vibrating machine. A vibration testing device for a structure according to one of the above. 6. A part of the structure is modeled as a real part, the other part is modeled as a numerical model, and the part modeled as a real part is provided with reaction force measuring means for measuring a reaction force from the real model to the vibration exciter. Excited by one or more exciters, the numerical model of the other part is incorporated in the computer as a vibration response calculation program, and the measured value of the reaction force measured by the reaction force measuring means in the computer. And the external force value applied to the structure are sequentially input, and the vibration response calculation program calculates the vibration response of the numerically modeled part after a certain time from the reaction force measurement time, and adds it based on the calculated value. In the vibration test method of the structure that repeatedly executes the operation of generating the vibration signal of the shaker and exciting the real model, the measured value of the displacement applied to the real model by the vibration of the shaker , Addition The response delay time of the exciter is calculated by comparing with the excitation signal value input to the machine, and the time obtained by subtracting the calculated response delay time from the above fixed time is the time after the reaction force measurement time. A vibration test method for a structure, wherein a vibration signal corresponding to a vibration response after the fixed time is applied to the vibration exciter. 7. A part of the structure is modeled with a real part, the other part is modeled with a numerical model, and the part modeled with the real part is provided with a reaction force measuring means for measuring a reaction force from the real model to the vibration exciter. Excited by one or more exciters, the numerical model of the other part is incorporated in the computer as a vibration response calculation program, and the measured value of the reaction force measured by the reaction force measuring means in the computer. And the external force value applied to the structure are sequentially input, and the vibration response calculation program calculates the vibration response of the numerically modeled part after a certain time from the reaction force measurement time, and adds it based on the calculated value. In the vibration test method of the structure that repeatedly executes the operation of generating the vibration signal of the shaker and exciting the real model, the measured value of the displacement applied to the real model by the vibration of the shaker ,Up The corrected value of the response delay time of the shaker was calculated by comparing it with the vibration response calculation value, and the time obtained by subtracting the preset shaker response delay time from the above fixed time has elapsed from the reaction force measurement time. A vibration test of a structure characterized by adding a vibration signal corresponding to a vibration response after a certain period of time to a vibration exciter at a time and correcting the set vibration exciter response delay time by the correction value. Method. 8. The vibration test for a structure according to claim 6, wherein the vibration signal is periodically applied to the vibration exciter with a time period shorter than the certain time period as a cycle. Method. 9. A structure having the vibration test device according to claim 1 as an auxiliary device, and a vibration test is performed by this test device. 10. A structure subjected to a vibration test by the vibration test method according to claim 6.