JPH0346076A - Signal structure identifying device - Google Patents

Abstract

PURPOSE:To perform signal classification correctly by performing the final and the optimum correspondence of a division signal including the correspondence of an unknown signal generating source with the division signal with a signal identifying device. CONSTITUTION:The signal identifying device 5 identifies the structure of each division signal according to a path obtained with a dynamic programming method (Dynamic Programming:DP) computer 4. The division signal conformed to a well-known signal source is identified with knowledge with respect to before and behind well-known signal sources and objects. Therefore, even when the division signal obtained from the unknown signal generating source having the same similarity as that of the reference feature quantity of the well-known signal source and that of the division signal conforming to the generating source exists, correct correspondence can be performed with the degree of collation of position information. In such a way, the signal classification can be performed correctly.

Description

[Detailed Description of the Invention] [Industrial Field of Application] The present invention provides a method for processing time-series signals when there are spatially arranged signal sources and time-series signals obtained by measuring and dividing the sources. The present invention relates to a signal structure identification device that is applied to all signal processing or some means for which it is useful to establish a correct correspondence with a signal generation source.

[Conventional technology]

Conventional signal structure identification devices include, for example, (1) means for classifying divided signals and associating them with signal generation sources by comparing feature quantities calculated from the divided signals with reference feature quantities of known signal generation sources; (Figure 3).

(2) Means for classifying the divided signals and associating them with the signal generation sources by comparing the converted positions of the divided signals calculated from the measurement time and the measuring device moving speed with the position information of the signal generation sources determined by the structure (Fig. 4) ).

It was common to adopt one or the other.

[Invention tries to solve it! Ill! [) In the conventional example shown in FIG. 3, classification may be incorrect if the reference feature amount and the feature amount due to an unknown signal generation source are similar, or if there is a signal omission. There is a problem in that it is not known which signal source corresponds to the signal that is missing.

In the conventional example shown in FIG. 4, there is a problem in that if there is a change in the moving speed of the measuring instrument, a deviation occurs in response.

The problem of the present invention is to obtain the information used in the conventional example shown in FIG.
It is an object of the present invention to provide a signal structure identification device that can effectively combine the information used in the conventional example shown in FIG. 4 to solve the conventional problems and perform more accurate signal classification.

[Means to solve the problem]

The signal structure identification device according to the present invention includes a signal splitting device that receives sequential signals from a test element moving along a predetermined path, and a feature value effective for association with respect to each divided signal divided by the signal splitting device. A feature amount calculation device that calculates the feature amount, and a comparison between the feature amount and the reference trace amount of the signal generation source, and a comparison between the spatial arrangement converted from the measurement time and measurement speed and the spatial arrangement of the known signal generation source.
a DP formulation device that uses the DP to formulate a path that corresponds to the optimal correspondence between the divided signal and the known signal generation source; The present invention is characterized by comprising a signal identification device that determines the correspondence between a signal and the signal generation source.

That is, in the present invention, a DP formulation device is added, and the matching between the divided signals and the signal generation source is performed using a very small amount of matching degree (the score of the node of the matching graph of the divided signal and the signal generation source shown in FIG. 6). ) and the degree of matching between the position of the signal source and the converted signal position (corresponding to the score of the branch of the matching graph). Also, by adding a DP calculation device, The optimal correspondence between the source and the divided signals can be found without using a brute force method, and the signal identification device can find the final correspondence, including the correspondence between the unknown signal source and the divided signals. It is possible to perform optimal correspondence between divided signals.

[Effect]

According to the present invention, when there is time-series data without retrograde data, it is divided □, there is a signal source with a reference value, and the position of the signal source, the speed of the measuring device, and the measurement time are obtained. Even when the feature values of the reference trace amount other than the known signal source and the divided signal due to the unknown signal source are similar, the influence of the matching ring between the spatial position of the known signal source and the converted position of the divided signal In addition, even if a signal is missing, it is possible to identify the location of the known signal source by comparing the structural position of the known signal source with the converted position of the divided signal. It can be determined whether a divided signal is missing or not, and even if there is a fluctuation in the moving speed of the measuring instrument, it can prevent mismatching based on the degree of matching between the reference trace amount of the known signal source and the characteristic amount of the divided signal. be able to.

〔Example〕

FIG. 1 is an overall configuration diagram of an embodiment of the present invention, where I is a signal division device, 2 is a feature calculation device for each divided signal, 3 is a DP formulation device, 4 is a DP calculation device, and 5 is a DP calculation device. A signal identification device is shown.

In FIG. 1, the functions of each part are as follows: O Signal splitting device l Mechanically splits the signal when the signal amplitude remains below a certain value for a certain period of time.

Feature amount calculation device 2 for each divided signal The signal features include (1) feature information of the divided signal, i.e., information that depends on the signal generation source, (++) time information, i.e., the arrangement of the entire signal generation source. Some things depend on the relationship.

For example, when the present invention is applied to structure identification using an ECT signal, which is one of the non-destructive inspections of a PWR plant S/G, two types of signals called an X signal and a y signal are obtained. (Figure 7). Examples of feature quantity (1) for associating this divided signal with a structure include the maximum value of the y signal, the amplitude of the X signal, and the like. - A summary of examples is shown in Figure 8.

An example of time information (!i) is the time from the start of the overall measurement until the start of measurement of the divided signals.

Dr formulation device 3 Performs necessary settings for the DP in order to use the DP to associate divided signals with known signal generation sources. This will be explained in detail. The divided signals are plotted on the horizontal axis in the order of measurement. Known signal sources are plotted on the vertical axis in order of spatial arrangement. The path is determined by associating the horizontal and vertical axes with DP. In DP, (1) path search S range and setting of evaluation function corresponding to (i+) are important.

(1) Path search range (1) in FIG. 9 shows the path search range when excessive generation of signals corresponding to unknown signal generation sources is taken into consideration. (2) in FIG. 9 shows the path search range when taking into account signal omissions corresponding to known signal generation sources.

(3) in FIG. 9 shows a case in which both are considered.

(10-compatible evaluation function settings A typical example is one in which an evaluation function related to signal feature information and an evaluation function related to signal position information are added with weight.The evaluation function related to signal feature information is There is a method that normalizes and adds the difference between the reference feature of the source and the feature of the divided signal.

Some evaluation functions related to position information normalize the distance between known signal generation sources and the converted distance between divided signals (obtained by referring to the correspondence up to the previous step).

(Figure 1O).

Signal identification device 5 identifies the structure of each divided signal according to the path obtained by the DP calculation device 4. The divided signals associated with the known signal generation sources are identified as the corresponding signal generation sources. The divided signals associated with the unknown signal generation sources are identified based on knowledge of the previous and subsequent known signal generation sources and objects.

A diagram conceptually summarizing the above flow is shown in FIG.

〔Effect of the invention〕

When associating a signal measured by moving a measuring instrument with a signal source that is spatially arranged, (1) the reference feature of a known signal source and its source; Even if there is a divided signal obtained from an unknown signal generation source that has a degree of similarity comparable to the feature value of the corresponding divided signal, correct association can be made based on the matching degree of the position information.

(2) Even if a divided signal corresponding to a known signal source is missing, the signal source corresponding to the missing signal can be obtained from the position information.

(3) If there is a fluctuation in the moving speed of the measuring instrument (for example, the original signal source (4), (event is the divided signal (1),
(2), even if the signal (1) is converted to a conversion position between the source (4) and 0 due to fluctuations in measurement speed, the difference between the base fli feature amount and the feature amount of the divided signal It becomes possible to perform correct correspondence based on the degree of matching.

[Brief explanation of drawings]

FIG. 1 is an overall configuration diagram of an embodiment of the present invention, and FIG.
A conceptual diagram of the properties of the target signal of the present invention, FIGS. 3 and 4 are conceptual diagrams showing conventional examples, respectively, FIG. 5 is a conceptual diagram of the method of the present invention in correspondence with the conventional example, and FIG. , FIG. 7 is a diagram showing an example of a target signal in an embodiment of the present invention, and FIG. 8 is a diagram showing an example of a matching graph of divided signals and signal generation sources corresponding to FIG. FIG. 9 is a diagram showing an example of a signal waiting amount in an embodiment of the invention, FIG. 9 is a diagram showing an example of a DP flaw detection range, and M2O diagram is a diagram showing an example of a DP evaluation function in an embodiment of the invention. FIG. 11 is a diagram showing a conceptual flow of an embodiment of the present invention. 1... Signal division device, 2... Feature calculation device, 3.
...DP formulation device, 4...DP calculation device, 5...
Signal identification device.

Claims (1)

[Claims] a signal dividing device that receives sequential signals from a test element moving along a predetermined path; a feature calculating device that calculates a feature effective for association with respect to each divided signal divided by the signal dividing device; Dynamic programming is used to match the feature values with the reference feature values of the signal generation source, and to match the spatial arrangement converted from the measurement time and measurement speed with the spatial arrangement of known signal generation sources.
a DP formulation device that uses the DP to find a path corresponding to an optimal correspondence between the divided signal and the known signal generation source; A signal structure identification device comprising: a signal identification device that finally determines the correspondence between the divided signal and the signal generation source.