JPS60183569A - Surveying method of signal generation source - Google Patents

Abstract

PURPOSE:To survey accurately even a signal source generated in media in an optional shape, such as the container and piping of nuclear power plant equipment, which has an area where no signal is transmitted by installing detectors at proper positions in those media. CONSTITUTION:The detectors 6-8 are installed at proper positions in a medium in an optional shape. Information on a shape which allows signal transmission and information on the signal arrival time delay of the detectors 6-8 are entered or inputted, and then parts corresponding to the signal arrival time delay of the detectors 6-8 are hatched on the basis of the detector 8 which detects a signal first, entering an initial state. Then when a signal arrives at corners P1-P3 to which no signal is transmitted later, circles of signal arrival time delay are drawn having centers at the corners and the intersection HP of arcs of equal arrival time delay from the detectors 6-8 is estimated as a signal generation source. Thus, the arcs of equal signal arrival time delay from the respective detectors are used to survey the signal generation source on a drawing, color display, etc.

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The present invention provides a method for detecting the source of (i) such as -I impact sound using a sensor installed at a predetermined location in a medium having an arbitrary shape. Exploration method for signal generation: Two related.

[Technical background of the invention and its problems] For example, items left behind in the reactor during reactor construction or nuclear study exchanges, or damaged items due to falling or deteriorating plant equipment parts may be damaged in the reactor. It may be mixed into the primary system. This foreign material that gets mixed into the primary reactor system is called Federal loose parts. Such loose parts tend to stay in the reactor pressure vessel and the bottom of the steam generator, and have a negative impact on the plant.The negative impact that loose parts have on the plant is damage to fuel rods due to channel box closure. , an increase in radioactive crud in the primary reactor system, inability to drive control rods, damage to the steam generator, etc. will occur, and furthermore, a safety issue will occur during the continuation of plant operation. In this way, we can remove the loose parts that create defects in the plant (first, we need to detect where the loose parts are located in the plant). For this reason, the loose fitting method is to impact the plant container, the inner ring of the piping, etc. A method for locating the position of loose shoes (V-snow shoes) has already been proposed. A time difference direct indication method that directly utilizes the arrival time difference data of the overhead shock waves of the 4i sound tester has been proposed. In this case, there is a part where the 6q strike sound location eel estimation zone +'-4g cannot be transmitted. There was a problem.

[Purpose of the invention] The present invention (a) above: This invention was made in view of the circumstances, and its purpose is to provide suitable locations in a medium having an arbitrary shape, such as inside a container such as a plant container, vinegar, or a pipe. To provide a method for detecting the source of a signal such as an impact sound by installing a sensor in the sensor and using the sensor to detect a source of a signal such as an impact sound. In addition, the method of detecting the source of A1□ in a medium with an arbitrary shape θk (2, the position of the AI sensor installed in the medium and the delay in the arrival time of A:C for each sensor) An initial state of an area corresponding to the signal arrival time delay in each sensor is set based on the information in h, and an output device displays the area corresponding to the signal arrival time delay in each sensor at a time when the drop is further than this initial state. In addition, the point where the areas corresponding to the signal arrival time delays for each sensor that went back to the same time from the initial state intersect is estimated to be the signal generation hill. There is a region where no signal is transmitted, and a color display or printer is used as the output device.

Next, the principle of the No. 6 source search method according to the present invention will be explained.

It's like the vibrations of 1'X are transmitted to IA like sound (
, No. 4 does not propagate in a space where there is no medium. To be honest, unless the vibration is at a supercrystalline frequency, the signal is transmitted by what is called an omnidirectional wave υ. When such a transmission is destroyed, the value of transmission distance #/transmission speed corresponds reasonably to the transmission distance as long as the transmission speed is constant. Therefore, the difference in the arrival time delay of individual signals due to the difference in the mounting position of the detector corresponds to the distance between the detector and the signal generation position, so the difference in signal arrival time can be replaced with the difference in signal propagation distance. .

FIG. 1(a) shows that when a signal is generated at the HP position, the detectors Pl, P2. It is a diagram showing how a signal is transmitted to P8. In other words, the signal generated at time to is at time 'l+'2 and time'1, and at time t5 the signal is detected by detector Pl.
i:, at time t6, detector Pz, at time t8, detector P8
reached. In this case, the information obtained is 0. Information on the signal arrival time delay of Δt for the detector P2 and 3Δt for the generator P8 and the detector Pl.

This is information on the position of P2+Pil.

FIG. 1(b) shows each of the above-mentioned detectors P, . . . P2.
FIG. 6 is a diagram for explaining the process of searching for a signal generation source from information regarding the signal arrival time delay and information regarding the position of P8. From the information regarding the position now obtained, the position of the detectors Pl+P2+P8 can be determined. Also, from the information regarding the signal arrival time delay, the detector Pl+P2+PB
It can be seen that signals are generated at points separated by a distance of 111 or more, O9Δt and 3Δt, respectively. This range is shaded in FIG. 1(b). Next, each detector p
1. P2. The signal transmitted to p8 is transmitted from each detector pl, p2. If we add △t to the time delay to p8 and pass the time, that is, the 11th gl
The time t when the detectors Pl and P21PB of a each received the
5°t6. As we move from time tB to time 1 (,) through the I+jJ center circle with a delay in signal arrival time, on ratio 1 diagram (b), the source HP of island No. 1 gradually approaches, and the intersection of the three concentric circles becomes (signal source) - IP and 41r. In this way, it is possible to search for the signal generation dQI-IF. Areas are also divided into Area A, where No. 16 is transmitted like a piece, and Area B, where the signal cannot be transmitted unless it is transmitted. For area A (for two, the position of the signal at a certain time t can be drawn as an equidistant curve, or for area B, as shown in Figure 1 (C), the corner PK of area C is As shown in Figure 1(d), the wave propagation becomes anchored by an equidistant gravity centering on PK.This phenomenon is caused by a very small △ being a continuation of the tangents of the circle, as shown in Figure 1(d). Furthermore, this phenomenon occurs independently in areas where there is a region C where no signal is transmitted.

Therefore, no matter how rough the area C is, the same phenomenon as described above will be repeated in the vicinity.

In this way, when searching for a signal generation helix in the case where there is a region C where no signal is transmitted, it is necessary to draw a shape in advance in which the signal will be transmitted. This method is different from the signal generation source search method in 1id(b).

In other words, in the drawing in which information regarding the shape of signal transmission is entered or input, information regarding the position of each detector and the axis regarding the delay in arrival time of No. 1 of each precipitator are also entered. Using the detector that first detected No. 1d as a reference, the part corresponding to the signal arrival time delay in the valley detector is shaded to form the cutting edge 1 state.Next, in time, the signal is not transmitted. If you set up at a corner of the castle, the signal centered at that corner: 4jj If you follow the arc of the delayed signal by tζ, the intersection of the arcs that is the delay in the arrival time of the IG signal from each detector will be In this way, the source of the signal can be traced on a drawing or a color display, etc., using an arc of equal signal arrival time delay from each detector.

Examples of the invention] An embodiment of the present invention will be described with reference to the drawings.

Figures 2 (a) to (C) are diagrams for explaining the signal generation im-exploration force method in a medium having an arbitrary shape, and show the process of estimating the A2 source in a two-dimensional case. It is something. As shown in the figure, there are obstacles 2 and 3.4 in the container 1 that prevent signal 1a from transmitting, so the signal J'+
;; The space 5 occupied by the medium can have an arbitrary shape. 6, 7.8 are sensors.

Now, in Figure 2 (a), for example, a side army sound is generated,
Assume that sensors 6 and 7 receive the signals at the same time, and sensor 8 receives them 11 times later.

First, the setting of the initial state in the signal source detection method of the present invention will be explained. Information regarding the shape conveyed by No. 1 generally needs to be investigated in advance, but in power plants, chemical plants, etc., it can be known at the design stage, so it can be considered □□□ knowledge. Further, information regarding the position of each sensor is naturally considered to be known. Furthermore, information regarding the signal arrival time delay of each sensor can be obtained by receiving the information with the actual device. In other words, in this embodiment, since the sensors 6 and 7 simultaneously receive the signal, the received time is the reference time, and the sensor 8 receives the signal tl later than the reference time.

FIG. 2(a) illustrates the initial state of the No. 8 source search method based on information regarding the propagation shape of No. 48, the position of each sensor, and the 1i++ delay in signal arrival at each sensor. That is, in FIG. 2(a), the signals from each sensor 6, 7, and 8 when the song is created at time t1 from the time when sensor 8 receives signal A1) are represented by diagonal lines. .7 is displayed as a dot, and sensor 8
9+ line is applied as shown in FIG. 2(a). In FIG. 2(a), for example, the diagonal portion to the left of the corner Pl is an area where the signal from the sensor 8 is not transmitted in a straight line, so the signal is transmitted centered around the corner Pl in this area. Both the upper part of corner P2 and the lower shaded part of corner P8 are areas where the signal from the sensor 8 cannot be transmitted in a straight line, so it is exactly the same as the case of corner P1. propagation of signals.

Next, when displaying a state where time has passed from the initial state of 2nd [; t
! i! The portion to which this has been applied becomes larger as shown in FIG. 1(b). The outer periphery of this hatched area will be referred to as the sensor envelope line. Furthermore, facing the time, valley sensor 6.
FIG. 2(C) shows a state in which the respective envelopes of 7.8 intersect at one point HP, and this intersection HP is determined as the signal generation source.

FIG. 3 is a flowchart showing the signal generation and detection method of the present invention described above.

That is, when a +7 signal generation cool detection command is issued, first, the shape of the gap through which the signal propagates is memorized. Next, input the position of each sensor and the signal arrival time delay of each sensor.

The shape of these 4m propagation spaces.

Based on the position of each sensor and the signal arrival time delay of each sensor, an initial state of the signal source search is determined 65. From this initial state, it takes more time.

Calculate the propagation distance of the two-phase signal over this time, and display the progress on an output display device such as a color display or printer each time the propagation distance is calculated. Therefore, the signal arrival time delay is changed, and based on this, the propagation distance of 1 corresponding to the change of this time delay from the initial state is output, and this is displayed on the output display device. In this way, if the signal generation source is tracked through the envelope lines of each sensor and the envelope lines intersect at one point, the position of the intersection is estimated as the signal generation source and the signal generation bowl search command is issued. will end.

In the above embodiment, for simplicity, the signal generation source detection method was explained in a two-dimensional plane, but in the case of three dimensions, the signal generation source detection method in the above embodiment is different only in that the signal generation source detection method is three-dimensional. Of course, it can be carried out in exactly the same way as in the case of the method.

[Effects of the Invention] As explained above, according to the signal source detection method of the present invention, even a signal source generated in a medium having a spectacular shape that has a region where a signal does not propagate can be accurately detected. .

[Brief explanation of drawings]

Figure 1 (a) is a diagram showing the temporary accommodation of No. 46,
Figure (b) is a diagram for explaining the principle of the signal source detection method of the present invention, t + = (c) is a diagram showing how the signal is transmitted when there is an area where the signal does not transmit, 1st
Figure (d) is a diagram to clarify the quotient 1 shown in the 11th MeJ (C), Figures 2 (a) to (C) l″i
FIG. 3 is a flowchart of the method for detecting the signal generation source in FIG. 2, which is an embodiment of the present invention. 2.3.5... Obstacles where signals cannot be transmitted 5... Spaces where signals are captured 6.7.8... Sensor agent Patent attorney Yoshiaki Inomata Clk or one person) 1st
Figure 2 (C) Figure 3

Claims (3)

[Claims] (1) In a method for detecting a signal source in a medium having an arbitrary shape, the signal arrival at each sensor is based on the position of a plurality of sensors installed in the medium and information regarding the (N arrival time delay) for each sensor. An initial state of an area corresponding to a time delay is set, and an output device displays an area corresponding to a delay in the signal arrival time of each sensor at a time further away from this initial state, and each sensor moved at the same time from the initial state. 4. A method for detecting the source of the No. 4 signal, characterized in that the point where the areas corresponding to the signal arrival time delays intersect is estimated to be the signal source. (2) The method of detecting a signal source according to claim 1, wherein there is a region in which a signal is not transmitted in a medium having an arbitrary shape. (3) The signal generation and stimulation method according to claim 1, wherein the output device is a color display or a printer.