JP3124159B2 - Seismic test system - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a seismic test system for performing a seismic test by installing a model on a shaking table using a shaking table in a power plant or the like.

[0002]

2. Description of the Related Art FIG. 6 is an explanatory diagram of a conventional seismic test method using an entire model, and FIG. 7 is a configuration diagram of a conventional seismic test device. In both figures, in the power plant, etc., FIG.
The main specimen to be evaluated for the earthquake response 30 is, for example, the case of the main model 12 such as a main steam pipe. At this time, the seismic acceleration input to the main model 12 enters from the gantry 2 and the top 21a of the cylindrical auxiliary model 21 on the steam supply source side as shown in FIG. Therefore, when evaluating the seismic response 30 of the main model 12, the movement of the auxiliary model 21 has an important meaning.

Therefore, the auxiliary model 21 cannot be omitted, and a model that simulates the actual machine structure faithfully is manufactured, and the auxiliary model 21 is supported on the gantry 3 by the supports 22 and 23.
Further, it is necessary to support the vibration table 1 with the support legs 24 for installation. However, there are restrictions on the size, mounting capacity, manufacturing cost, and the like of the shaking table 1, and in some cases, it was not possible to manufacture the auxiliary model 21 and perform an earthquake-resistant test.

[0004]

As shown in the prior art, there are the following problems when an auxiliary model is manufactured with high accuracy and an earthquake-resistant test is to be performed. (1) The size and mounting load of the shaking table are limited, and an auxiliary model exceeding this limit cannot be mounted. (2) The seismic response is governed by the three factors of mass, damping, and stiffness of the model, but it is very difficult to simulate the damping with high accuracy. (3) When the auxiliary model is very heavy, additional equipment necessary for assembling such as a crane for transportation is required, which significantly increases the cost. (4) The production of the auxiliary model is very costly, and incorporating it requires human labor and days. (5) When an experiment is performed by changing the frequency of the auxiliary model, a plurality of auxiliary models need to be manufactured, which increases the model manufacturing cost, the number of days for assembling, and labor.

[0005] Due to the above reasons, cost, process,
Due to physical constraints, there was a problem that the intended seismic test could not be performed.

[0006]

According to the present invention, in order to solve the above-mentioned problem, in a system for performing an earthquake-resistant test on a model to be evaluated together with an auxiliary model, an auxiliary model manufactured by simulating a conventionally used experimental structure is used. Without using
Instead, the actuator is controlled by an actuator and a control device including a digital computer and an analog control device to generate the same earthquake response as that of the auxiliary model, and a means for performing a seismic test of the model to be evaluated.

That is, according to the first aspect of the present invention, a steam pipe of a power plant is simulated and attached to a vibration table via a first frame.
In the evaluation target model, in a system for performing seismic model experiment evaluation target model by connecting an auxiliary model simulating the steam supply source in the pipe is connected, set to the vibration table
An actuator coupled between the second frame and the model to be evaluated, a digital computer that incorporates a seismic response analysis routine and calculates an earthquake response of the auxiliary model, and receives a command signal from the digital computer; A control device comprising an analog control device that outputs a control signal of the actuator, and a control signal from the control device is sent to the actuator, and the drive of the actuator drives the evaluation target model and the auxiliary model. Another object of the present invention is to provide a seismic test system using the shaking table, wherein the shaking table is replaced with the auxiliary model by performing almost the same movement.

According to a second aspect of the present invention, there is provided the digital computer according to the first aspect of the present invention, wherein an acceleration signal from an accelerometer installed on a shaking table to which the model to be evaluated is attached, the model to be evaluated and a tip of the actuator are provided. And input the load signal from the load cell inserted between the two to obtain the seismic response value of the auxiliary model in the seismic response analysis routine, and calculate the phase and gain characteristics of the seismic response value using the phase and gain characteristics of the actuator.
The system is equipped with a function to make corrections in consideration of the performance and output it as a command signal to the analog control device, and responds to the vibration of the model to be evaluated with less time delay. Things.

[0009]

According to the present invention, since the digital computer has a built-in auxiliary model seismic response analysis routine, the digital computer calculates the auxiliary model seismic response signal. calculate. The command signal enters an analog control device, which converts the command signal into a control signal for an actuator and controls the actuator. Since the actuator is connected to the model to be evaluated, its piston vibrates at the connection part in the same manner as the vibration of the auxiliary model and vibrates the model to be evaluated.From the viewpoint of the model to be evaluated, it is as if there is an auxiliary model. In other words, the evaluation can be performed in the same manner as when an overall model exists.

In the invention of claim 2, the digital computer receives an acceleration signal from an accelerometer installed on the shaking table and a signal from a load meter installed between the actuator tip and the model to be evaluated. Then, the seismic response of the auxiliary model is obtained by the seismic response analysis routine, and the response value is adjusted in consideration of the phase and gain characteristics of the actuator, corrected, sent to the analog control device, and the actuator is controlled. Therefore, the seismic response is calculated at a high speed within a range where the time delay is negligible with respect to the vibration of the evaluation target model. The same evaluation can be made as if there is a whole model.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be specifically described below based on embodiments shown in the drawings. FIG. 1 is a configuration diagram of an earthquake-resistant test system according to one embodiment of the present invention. In the figure, a characteristic portion of the present invention is a portion A shown in FIG. FIG.
Is equipped with a control device 4 installed on a foundation 13, an actuator 10 having a piston rod 14, a load meter 11, and an accelerometer 15, and the gantry 2 is mounted on the shaking table 1. Fixed to The actuator 10 is fixed to the gantry 3 and the piston rod 1
The tip of 4 is attached to the main model 12 via the load cell 11. The control device 4 includes a high-speed digital computer 6 and an analog control device 5 for converting a signal output from the computer 6 into a control signal 8 for an actuator.

In the present invention, when the vibrating table vibrates,
Receiving the shaking table acceleration signal 7 and the load signal 9 applied to the tip of the piston rod from the main model 12, the digital computer 6 calculates the seismic response value of the auxiliary model when the auxiliary model is equipped, and calculates the phase and gain of the actuator 10. The phase and gain characteristics are corrected in consideration of the characteristics, and then
The analog controller 5 converts the calculated motion into a control signal 8 necessary for causing the actuator 10 to move the same motion as the seismic response value at the connection point of the obtained auxiliary model with the main model, and inputs this to the actuator 10. I do.

As a result, the piston rod 14 of the actuator 10 has the same vibration behavior as that of the connection point of the auxiliary model with the main model 12. Such an operation is performed by the control device 4, that is, the high-speed digital computer 6 every moment with almost no time delay, thereby obtaining an earthquake response behavior of the main model with respect to an earthquake input over a certain period of time.

Next, the operation of the embodiment having the above configuration will be described with reference to FIGS. FIG. 2 is a block diagram of each element in the embodiment of the configuration shown in FIG. 1, and FIG. 3 is a diagram schematically showing a signal flow in detail. These figures are basically the same in nature, and FIG. 2 is a little more detailed, and will be described with reference to both figures. In FIG. 2, a portion A indicates a component of the present invention, and is a portion to be replaced with an auxiliary model. The high-speed digital computer 6 has an analysis model 16 (shown in the schematic diagram of FIG. 3 and omitted in FIG. 2) capable of performing an earthquake response analysis of the omitted auxiliary model, an earthquake response analysis routine 19, and a gain and phase correction routine. 20 are incorporated.

As shown, the high-speed digital computer 6 receives as input the acceleration signal 7 from the accelerometer 15 of the shaking table 1 and the actually measured value of the load signal 9 from the main model 12. The seismic response is calculated by the auxiliary model seismic response analysis routine 19 at a high speed within a range in which the time delay can be ignored, the phase and gain correction routine 20 is performed, the phase and gain are corrected, and the command signal 17 is corrected.
Is output to the analog control device 5.

The analog control device 5 compares the difference between the command signal 17 and the measured signal 18 with the control signal 8 to the actuator 10.
Output as As a result, the piston rod 14 moves in the same manner as the command signal 17 (see FIG. 3). Therefore, from the viewpoint of the main model 12, it is as if there is an omitted auxiliary model, and the seismic response of the main model can be evaluated in the same manner as when the entire model exists.

This can be described by the following mathematical expressions. The seismic response of the main model is determined by the acceleration input signal 7 on the shaking table 1 and the load signal 9 (F _p ) from the auxiliary model as shown in the following equation. The seismic response of the auxiliary model is based on the acceleration input signal 7 on the shaking table 1 and the main model 12.
Is determined by the load signal 9 (−F _p ) from the following.

[0018]

(Equation 1)

Here, M _p , C _p , K _p , and x _p are the mass, damping, stiffness, and displacement of the main model, respectively, and M _s , C
_s, K _s, x _s is the mass of each auxiliary model, damping, stiffness, is the displacement. In addition, the load F _p is obtained by calculating two displacement differences x _s
Determined by the -x _p.

Therefore, in order for the seismic response of the main model to be equivalent to the case where the auxiliary model is actually made, the equation (1)
It suffices if the F _p in the table matches. That is,
Displacement difference x _s -x _p so that it is sufficient to match. Therefore, displacement of the piston rod so as to coincide with the displacement x _s in the formula (2), so that it moving the actuator.

[0021] On the other hand, the seismic response displacement x _s of the auxiliary model,
The load (−F _p ) of the main model 12 and the acceleration input signal 7 may be obtained from the equation (2). In this system, this _Fp and the acceleration input signal 7 are actually measured by a sensor (accelerometer 15).
A displacement (x _s ) of the auxiliary model is obtained by using equation (2), and the actuator 10 is controlled so as to follow this signal as a command signal. The simulator performs a motion equivalent to the auxiliary model instead of the auxiliary model. It is what it was.

Next, the present invention and a conventional whole model are manufactured and data obtained by experiments are compared. FIG. 4 shows the waveform of vibration with time on the horizontal axis and displacement (Displacement) on the vertical axis.
Is a conventional waveform produced by making a whole model and experimenting, and (b) is a waveform to which the present invention is applied. FIGS. 5A and 5B show frequency analysis in which the horizontal axis represents frequency and the vertical axis represents power spectrum density. FIG. 5A shows a conventional frequency analysis using the entire model, and FIG. 5B shows a frequency analysis to which the present invention is applied.

4 and 5, the characteristics of (a) and (b) are well compared, and the seismic test system of the present invention can accurately perform an experiment without producing an auxiliary model simulating a real machine. It can be understood that it is appropriate.

[0024]

As described above, according to the seismic test system of the present invention, when the seismic test of the model to be evaluated is performed using the auxiliary model, the auxiliary model is replaced with the auxiliary model. A system that calculates the equivalent signal with an actuator that moves in the same way and a control device that controls it, drives the actuator, and performs a seismic test of the main model,
Furthermore, the control system is equipped with an earthquake response analysis routine and a function to correct the phase and gain characteristics by inputting the acceleration signal and load signal of the main model. It has the following effects.

An auxiliary model is not manufactured, and is transported for an earthquake-resistant experiment based on a signal obtained by calculation.
No special crane equipment is required. For this reason, seismic tests that were impossible in the past due to limitations on dimensions and weight have become possible, and elements that are difficult to simulate in model production, such as attenuation, can be accurately revealed.

In addition, the number of man-hours and the number of working days associated with the model change are reduced, and the model production cost is not required. Only the numerical value of the analysis model in the digital computer is changed, and the main model for the auxiliary model having a plurality of vibration characteristics is changed. The seismic response test can be performed accurately with no time delay, and no special time consideration is required for shaking table excitation.

Furthermore, in addition to the above-mentioned effects, the system of the present invention is low in cost, compact as a device, capable of consolidating seismic tests, and achieving rationality as compared with the case where an auxiliary model is actually manufactured and experiments are performed. It is.

[Brief description of the drawings]

FIG. 1 is an overall configuration diagram of a seismic test system according to an embodiment of the present invention.

FIG. 2 is a block diagram of components of the seismic test system according to one embodiment of the present invention.

FIG. 3 is a schematic diagram of the block diagram shown in FIG. 2;

4A and 4B are waveform diagrams comparing the present invention and conventional experimental data. FIG. 4A shows a case where a conventional overall model is used, and FIG.
Indicates that of the present invention.

FIG. 5 is a diagram of frequency analysis comparing the present invention with conventional experimental data. FIG.
(B) shows that of the present invention.

FIG. 6 is an explanatory diagram showing a conventional seismic test method using an entire model.

FIG. 7 is a configuration diagram of a conventional seismic test system.

[Explanation of symbols]

 Reference Signs List 1 shaking table 2 gantry 3 gantry 4 controller 5 analog controller 6 high-speed digital computer 7 shaking table acceleration signal 8 control signal 9 main model load signal 10 actuator 11 load meter 12 main model 14 piston rod 15 accelerometer 16 earthquake response analysis model Example 17 Command signal 18 Actual measurement signal 19 Earthquake response analysis routine 20 Phase and gain correction routine

──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Tomohiro Ito 2-1-1 Shinhama, Arai-machi, Takasago City, Hyogo Prefecture Inside the Takasago Research Laboratory, Mitsubishi Heavy Industries, Ltd. (72) Inventor Toshio Yamashita 6-16-1, Hinoshima Enouracho, Shimonoseki-shi No. 3 Shimonoseki Shipbuilding Co., Ltd. (72) Inventor Masahiro Morita 2-8-25 Shinhama, Araimachi, Takasago City, Hyogo Prefecture Inside Takashi Engineering Co., Ltd. (56) References JP-A-2-82132 (JP, A) JP-A-5-142089 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) G01M 7/02

Claims (2)

(57) [Claims] 1. A first embodiment of a steam plant of a power plant ,
The evaluation target model attached to the shaking table via the gantry ,
In a system in which an auxiliary model simulating a steam supply source connected to the pipe is connected to perform an earthquake-resistant model experiment of a model to be evaluated, a second gantry provided on the shaking table and a target to be evaluated are described. An actuator coupled between the model and
A digital computer that incorporates an earthquake response analysis routine to calculate the earthquake response of the auxiliary model, and a control device that receives a command signal from the digital computer and outputs a control signal of the actuator and an analog control device. it sends a control signal from the control unit to the actuator, the vibrating table being characterized in that replaced the auxiliary model the evaluation target model by driving the same actuator to movement substantially the same as the auxiliary model Seismic test system used. 2. The digital computer according to claim 1, further comprising: an acceleration signal from an accelerometer installed on a shaking table on which the model to be evaluated is mounted; and a load signal from a load meter inserted between the model to be evaluated and the tip of the actuator. enter seek seismic response values of the auxiliary model seismic response analysis routine, the same seismic response value phase position of the gain characteristics the actuator
A function of correcting a phase and a gain in consideration of a characteristic and outputting the same as a command signal to an analog control device, and responding to a vibration of the model to be evaluated with a small time delay. 1. The seismic test system according to 1.