Method for preliminary assessment of quality of diagnostic tests

FIELD: information technology.

SUBSTANCE: disclosed is a method for preliminary assessment of quality of diagnostic tests, consisting in that, based on the description of internal parts of the diagnosed article, an equivalent standard model of connections is formed; for the obtained standard model of the diagnosed article, combinations of input test signals are formed; for each combination of input test signals, parameters of combinations of output signals are determined, wherein at the inputs of the obtained standard model of the diagnosed article, corresponding combinations of input signals are given in a corresponding sequence given in the assessed diagnostic test; for each combination of given input signals, except the first, parameters of combinations of response signals at the outputs of the standard model of the diagnosed article and in characteristic intermediate points between standard models of component parts of the article are determined and, by comparing response signals obtained for the previous combination of given input signals, change in values of response signals is determined; preliminary efficiency of the diagnostic test is calculated; a preliminary decision on sufficient quality of the assessed diagnostic test is made, as a result of which the assessed diagnostic test is sent for refinement or for experimental checking.

EFFECT: shorter time for diagnosing engineering systems.

5 dwg, 1 tbl

 

The invention relates to the field of diagnostics of technical systems and can be used in assessing the effectiveness of diagnostic tests technical systems (including electronic equipment) of different complexity.

The known method of formation diagnostic tests based on the use of the reference model diagnostic products based on the book: Reliability and efficiency in the technique. The guide 10 so v.9. Technical diagnostics. Edited Via. - M.: Mashinostroenie, 1987, s-178. - [1]. The essence of this method consists in applying to the inputs of a reference sample of the controlled equipment sets of input signals corresponding to the actual combinations of input signals, for each regular situation (the standard set of input signals) measure the signals appearing at the outputs of the reference sample and the characteristic (control) intermediate points of the reference sample of this type of apparatus, the measured value combinations of the input signals, the values of combinations of the output signals and the values of combinations of signals in the intermediate control points fixed for later use when diagnosing the condition and diagnosis of this type of electronic equipment.

The advantage of the method [1], is the ease of formation diagnostic tests and on the note of tests, that allows you to determine the status of the controlled products of this type (according to the principle of good/bad) to match the reference output signals and output signals of the scanned sample of products of this type for the same combinations of input (test) signals.

The disadvantages of the method [1] is a limited scope, the impossibility of formation tests in the absence of the reference samples and the lack of reliability of tests.

The prototype of the present invention is a Method of formation diagnostic tests" on the patent of the Russian Federation: EN 2261471 C1 from 27.09.2005,, IPC G05F 11/22, G05B 23/00 - [2]. The method consists in the fact that on the basis of the description of the internal parts of the diagnosed product form is equivalent to the reference model compounds, breaks equivalent to the reference model compounds include pre-trained reference model component parts of this diagnostic products, obtained for the reference model diagnostic products form the combination of input test signals with predetermined combinations of signals with predetermined sequences of input signals, for each combination of input test signals to determine the parameters of the combinations of the output signals on the inputs received reference fashion is diagnosed and products set the appropriate combination of input signals in the respective sequence reflecting the real time performance of inspected parts, for each combination of the set of input signals determine the parameters of the combinations of the response signals at the outputs of the reference model of the diagnosed device and in typical intermediate points between the reference models of the component parts of the product are entered by computer parameter values of the response signals received from outputs of the reference model and the intermediate points of the standard model diagnostic products, together with the parameters of the corresponding test input signals to the database, repeat the process of applying the input test signals and determination of parameters of equivalent output signals to a complete enumeration of all States of the standard model diagnostic products, formed a set of input test signals and associated criteria equivalent output signals are used to diagnose States real products and Troubleshooting component parts of products.

Prototype method provides the possibility of forming tests in the absence of reference samples of control objects. In the method prototype for the formation of the diagnostic tests used sequence of input vectors (combinations of the input signals arriving at the inputs diagnosed goods only in the course of its normal operation. However, such sequences, the AK rule, do not provide as optimal control process, and the necessary depth diagnosis. In this regard, the procedure for diagnosing apply a specially crafted diagnostic tests.

The purpose of diagnostic tests is the detection of possible malfunctions of the inspected parts. This is achieved by ensuring the passage of the changing information through the maximum number of circuits inspected parts.

The quality of each diagnostic test is determined by the results of the field experiments (tests) to diagnose the product by making artificial faults and determining the response to these faults analyzed test data and on real operation. This procedure is laborious, monotonous, time-consuming, requires a lot of attention, patience and perseverance. This leads to the need to reduce time and material costs on the assessment of the quality of diagnostic tests. As one of the ways to solve this problem it is proposed to determine the degree of coverage of each test case information circuits diagnosed even before testing. After analyzing the coverage of diagnosed object specific test you can spend p is adveritising quality score for this test and make decisions about the readiness of the analyzed test to use when conducting trials to assess its effectiveness (quality), or about sending the analyzed test for completion.

In the method-prototype "define the parameters of the combinations of the response signals at the outputs of the reference model diagnosable product characteristic in the intermediate points between the reference models of the component parts of the product" [2], i.e. prototype method provides information, on the basis of which further can be carried out a preliminary assessment of test quality. However, this method does not assume use this information to determine the extent of coverage of diagnosed object specific test and, accordingly, the prototype method does not allow a preliminary assessment of test quality. Another disadvantage of the prototype method is the use of a sequence of input vectors received at the inputs diagnosed goods only in the course of its normal operation.

These drawbacks are aiming to create opportunities preliminary quality assessment of diagnostic tests.

The task is solved in (the essence of the invention), which method consists in the fact that on the basis of the description of the internal parts of the diagnosed product form is equivalent to the reference model compounds, breaks equivalent to the reference model compounds include pre-trained reference model component parts of this slave isdel what I for the obtained reference model diagnosable products are formed combination of input test signals with predetermined combinations of signals with predetermined sequences of input signals, for each combination of input test signals to determine the parameters of the combinations of the output signals, thus:

on the inputs received reference model diagnostic products set the appropriate combination of input signals (input signals) in the sequence specified in the evaluated diagnostic test

for each combination of the set of input signals, except the first, determine the parameters of the combinations of the response signals at the outputs of the reference model of the diagnosed device and in typical intermediate points between the reference models of the component parts of the product, and comparing the response signals received for the previous combination of the set of input signals, determine the occurrence of a change of the values of the response signals,

- the number of changes in the values of parameters of signals in each chain reference model diagnosed articles counted by computer and recorded in the database

on the basis of data on the quantities of changes in the values of parameters of signals of all the circuits of the standard model diagnostic products after filing in the model dia is esteruelas product of all input actions from the estimated diagnostic test calculates preliminary efficacy of this test (the degree of test coverage information circuits diagnosed products) according to the formula:

where N is the number of chains, accessed via the outputs of the reference model and the characteristic of the intermediate point between the reference models of the component parts of products,

NISM- the number of the N circuits in which there was at least one change of values of parameters of signals,

- for each output of the reference model diagnostic products and each characteristic intermediate point between the reference models of the component parts of the product display a visual indication of a change in information (also, have you changed the info parameters of signals in them during the passage of the estimated diagnostic test,

- based on the value of the preliminary effectiveness To evaluate a diagnostic test, as well as visually displaying signs of changing parameters of the signals at the outputs of the reference model diagnostic products and typical intermediate points between the reference models of the component parts of products adopt the advanced solution of sufficient quality to evaluate a diagnostic test, which evaluated the diagnostic test is sent back for revision or sent for experimental validation.

Thus, the technical result from the use of the invention is to eliminate the disadvantages of the prototype of the a, namely:

use as input information specially crafted diagnostic tests;

providing preliminary quality assessment of diagnostic tests.

Introduction in the present invention a distinction: "the inputs received reference model diagnostic products set the appropriate combination of input signals (input signals) in the sequence specified in the evaluated diagnostic test is necessary to remove the limitations of the prototype method associated with a sequence of input vectors received at the inputs diagnosed goods only in the course of its normal operation.

Introduction "for each combination of the set of input signals, except the first, determine the parameters of the combinations of the response signals at the outputs of the reference model of the diagnosed device and in typical intermediate points between the reference models of the component parts of the product, and comparing the response signals received for the previous combination of the set of input signals, determine the occurrence of a change of the values of the response signals, which is necessary to determine whether the information changes during the execution of the test on the outputs diagnosed of the product and its characteristic intermediate points.

Introduction "count the number of changes in the values of parameters of signals in each chain reference model diagnosed articles counted by computer and entered into the database and" on the basis of data on the quantities of changes in the values parameters of signals of all the circuits of the standard model diagnosed articles after submitting the model to diagnose the product of all input actions from the estimated diagnostic test calculates preliminary efficacy of this test by the formula:

where N is the number of chains, accessed via the outputs of the reference model and the characteristic of the intermediate point between the reference models of the component parts of products,

NISM- the number of the N circuits in which there was at least one change in the parameter values of the signals required to calculate a quantitative assessment of the quality of the analyzed test.

Introduction "for each output of the reference model diagnostic products and each characteristic intermediate point between the reference models of the component parts of the product display a visual indication of a change in information (also, have you changed the info parameters of signals in them during the passage of the estimated diagnostic test" is necessary for the qualitative assessment of the quality of the analyzed test.

Introduction based on the value of the preliminary effectiveness To evaluate a diagnostic test, as well as visually displaying signs of changing parameters of the signals at the outputs of the reference model diagnostic products and the characteristic intermediate points between the reference models of the component parts of products adopt the advanced solution of sufficient quality to evaluate a diagnostic test, in which assessed the diagnostic test is sent back for revision or direct experimental verification is necessary for a decision on the preliminary assessment of the quality of the analyzed diagnostic test.

Figure 1 is conventionally depicted electronic circuit, which plays the role of diagnostic products.

Figure 2 - diagram of the electrical connections between the contacts of the device Y1The ... Y6figure 1.

Figure 3 is a full - featured model of the schema diagnosed articles figure 1 with the inclusion of device models Y2, ..., Y5in the appropriate places model the electrical connections figure 2.

Figure 4 - circuit model in figure 3 for a preliminary quality assessment of diagnostic tests of the claimed method.

Figure 5 is a visual representation of a real diagnostic object.

The practical implementation of the method is illustrated in figure 1÷5.

For this purpose, as an example, diagnostic products used electronic circuit, which are branched by the input logic circuit, having in its composition 6 radio electronic elements, indicated in figure 1 legend Y1, ..., Y6.

Device Y1 and Y6 represent the input and output connectors. Device Y2, ..., Y5 represent the corresponding logic integrated the scheme (with logical functions depicted within the contours of the designations of these devices in the diagram Fig 1).

Electrical connections between the contacts of the device Y1, ..., Y6 shown in figure 2. The implementation of the electrical connections under this scheme in the form of electrical conductors between the respective contacts will be a physical model of the electrical connections of the products presented on figure 1.

The internal properties of each active device (Y2, ..., Y5), part of the products 1, can be represented by an equivalent functional models. In this case, functions of devices included in the product 1, can be characterized by the following descriptions of logic functions:

where a1, a2signals on input pins (1, 2) Y2, Y3and Y5;

and5- signal on the output contacts (5) devices Y2, Y3and Y5;

b1b3b4signals on input pins (1, 3, and 4) device Y4;

b5- signal at output pin (5) device Y4.

Device models Y2, ..., Y5should my settings be fully consistent with the properties and parameters of the real devices of the same type.

As the activation of the device models Y2, ..., Y5in sootvetstvujusjie in model electrical connections figure 2 is conventionally shown in figure 3. In the result we have a fully functional model circuit apparatus 1, for which you want to evaluate the effectiveness of a given test.

The circuit model of figure 3 to evaluate the effectiveness of diagnostic tests of the claimed method are presented in figure 4. The set of input actions 1 running from the computer 2 generates the input of the i-th test apparatus 1. Generated input signals are fed to the inputs of the standard model 3 (figure 3). Response reference model 3 for each combination of test input actions will manifest itself in the form of a combination of the output signals on the outputs of the model 3, which are fixed by the definition block of the response signals 4.

Simultaneously with the latching of the output signals of the block definition of the response signals 4 captures the signal parameters of the response model (figure 3) products with outputs of device models Y2, Y3and Y4(which is the intermediate control points scheme 1).

The signal response for each combination of input test analyzes the computer 2 and stored. In addition, the computer 2 for each k-th chain reference model diagnosed product counts the number of changes in the values of parameters of signals occurring after the submission of all input actions of the i-th test and determines the efficiency of the i-th test K, according to the following expression (1).

The process of determining the effectiveness of the i-th test K shown in table 1, column:

t=s(s=1...5) values of signals in the circuits of the device 1, after the filing of the t-th input action;

Σt(t=2...5) - the amount of change of the signals occurring in the circuit device 1, for a period of time, starting from the beginning of the test and ending supply of t-th input action;

PISM- indicative signal change occurring in the circuits of the device 1, at the time of the test (since the beginning of the test and completing the submission of the last 5-th input action: "+" change, "-" - changes was not.

Table 1
Circuitj=1j=2Σ2j=3Σ3j=4Σ4j=5Σ5PISM
Input circuitY1-1-Y2-10110 20213+
Y1-2-Y2-2101120303+
Y1-3-Y3-1110100112+
Y1-4-Y3-2101010112+
Y1-5-Y4-41100 10112+
Y1-6-Y5-2101120314+
Chain with intermediate control pointsY2-5-Y4-1110101010-
Y3-5-Y4-3011111102+
Y4-5-Y5-10 00111111+
Y5-5-Y6-2110011203+

From table 1 it is seen that N=10, NISM=9 and hence the efficiency of the test is equal to K=0,9.

Information about the absence of change of the signals of the n-th chain (n=1, N) indicates that in the presence of faults in it, these faults will not be detected. Thus, before the application of tests you can pre-evaluate the effectiveness of diagnostic tests to detect in testing the object parts of the equipment not covered by the test, and to analyze the reasons for this. These reasons include:

- unused circuits, for example, "hanging" contact chip;

the circuit can include a circuit or grounding;

- the chain is not covered by the test due to the insufficient quality level of the test.

The analysis of the object of diagnosis figure 1 the process of passing test

table 1 showed that the effectiveness of the test K=0.9, and not K=1, related to an insufficient level of quality test, in which none of the j-th input signals are not supplied to the input terminals (1, 2) device Y2figure 1 sequence is "11", resulting in no change of the signal at output pin (5) device Y2during the entire test. For this reason, a malfunction Y2data will not be detected. To eliminate this drawback and improve the efficiency of the test, you must complete the test in the part sequence "11" input contacts (1, 2) device Y2.

The real object of diagnosing cards cell with a gray mask (for clarity) is shown in figure 5, where:

1 is a screen form program 2 displays the test object with the visual representation of the degree of coverage of the evaluated test information circuits diagnosed of the object 3 is an enlarged view of one of the elements of the object being diagnosed, 4 - radioelements diagnosed object. The radioactive elements are indicated by red colour contacts that have not been alteration of the information under test, green contacts, in which there has been a change of information.

The results of the analysis can be decided enough will precede the flax level of performance test or the need to Refine the test.

Thus, the claimed method preliminary quality assessment of diagnostic tests provides an opportunity-based models to obtain reliable data on the extent of coverage of the test circuits of diagnosed object that allows you to decide on a sufficient level of performance test or the need for revision of the test.

The proposed method provides equal quality assessment of diagnostic tests based on physical models (models electrical connections, models of component parts of equipment), and based on appropriate mathematical models. With the essence of the method and its effectiveness does not depend on the way the model is implemented.

As blocks 1 generating test signals (represented in figure 4) in the case of diagnostic objects in the form of electronic equipment (figure 1) can be used the appropriate code combinations generators, pulse generators, signal generators, special forms, etc. known from the prior art. As blocks 4 define the parameters of the response signals can be used digital oscilloscopes, logic analyzers, signature analyzers, and other appropriate measuring device known from the prior art.

In the case of mathematical reference is Adela blocks 1, 3, 4 (figure 4) is implemented within the computer 2 in the form of appropriate software products, adequate to their physical equivalents.

Presents a way to visually demonstrated in figure 5, which shows the practical implementation of this method.

LITERATURE

1. Reliability and efficiency in the technique. The guide 10 so v.9. Technical diagnostics. Ed. VLA. - M.: Mashinostroenie, 1987, s-178.

2. Patent of the Russian Federation: EN 2261471 C1 from 31.03.2004 year, IPC G05F 11/22, G05B 23/00, the Method of formation diagnostic tests - prototype.

Method preliminary quality assessment of diagnostic tests, namely, that on the basis of the description of the internal parts of the diagnosed product form is equivalent to the reference model compounds, breaks equivalent to the reference model compounds include pre-trained reference model component parts of this diagnostic products, obtained for the reference model diagnostic products form the combination of input test signals with predetermined combinations of signals with predetermined sequences of input signals, for each combination of input test signals to determine the parameters of the combinations of the output signals, wherein the inputs received reference model to diagnose isdel what I ask appropriate combination of input signals in the appropriate sequence, specified in the evaluated diagnostic test,
for each combination of the set of input signals, except the first, determine the parameters of the combinations of the response signals at the outputs of the reference model of the diagnosed device and in typical intermediate points between the reference models of the component parts of the product, and comparing the response signals received for the previous combination of the set of input signals, determine the occurrence of a change of the values of the response signals,
the number of changes in the values of parameters of signals in each chain reference model diagnosed articles counted by computer and recorded in the database
on the basis of data on the quantities of changes in the values of parameters of signals of all the circuits of the standard model diagnosed articles after submitting the model to diagnose the product of all input actions from the estimated diagnostic test calculates preliminary efficacy of this test by the formula:
K=NISM/N
where N is the number of chains, accessed via the outputs of the reference model and the characteristic of the intermediate point between the reference models of the component parts of products,
NISM- the number of the N circuits in which there was at least one change of values of parameters of signals,
for each output of the reference model diagnostirovannaya and each characteristic intermediate point between the reference models of the component parts of the product display a visual indication of a change in information of the signal parameters in them during the passage of the estimated diagnostic test
based on the value of the preliminary effectiveness To evaluate a diagnostic test, as well as visually displaying signs of changing parameters of the signals at the outputs of the reference model diagnostic products and typical intermediate points between the reference models of the component parts of products adopt the advanced solution of sufficient quality to evaluate a diagnostic test, which evaluated the diagnostic test is sent back for revision or sent for experimental validation.



 

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1 dwg

FIELD: physics.

SUBSTANCE: method of detecting malfunctions in bottles in bottle processing machines, wherein a signalling device lies independently from the point where malfunctions occur, preferably in the central part of the bottle processing machine, and the point of the malfunction is optically marked from a distance. The signalling device is optically modulated such that colour and/or image and/or beam direction and/or light pattern of the light source is time and/or spatially modulated.

EFFECT: fast detection and elimination of malfunctions.

17 cl, 1 dwg

FIELD: physics; control.

SUBSTANCE: invention relates to systems, devices and methods for monitoring and transmitting information from a system component sensor located in a high-risk zone. Transmission of information on a system component sensor located in a hazardous zone to a system controller involves use of an improved controller of the hazardous zone along with transmission of data over power lines in order to transmit diagnostic information obtained from the sensor located in the high-risk zone to a central monitor/controller located in a safe zone.

EFFECT: improved transmission of information from sensors lying in a high-risk zone to a central controller lying outside the high-risk zone.

26 cl, 4 dwg

FIELD: information technology.

SUBSTANCE: method involves mathematical planning of an experiment with a set of devices and constructing mathematical models reflecting the effect of input signals and operating action, as well as internal factors (component parameter spread), where said mathematical models are used to form sets of actions and the corresponding allowable deviation of input parameters of the devices (proof tests) in order to check conformity of the manufactured devices with given requirements.

EFFECT: high quality of inspecting manufactured devices.

2 cl, 5 dwg

FIELD: automatic control, applicable in systems with excessive quality of transducers, for example, accelerometers, a failure of one of which should not result in a failure of the control system.

SUBSTANCE: the method is based on a periodic check-up of relation between the measured parameters of motion characterizing the correct operation of the transducers, fixation of the moment of failure of the relation, comparison of the readings of the transducers at this moment and at the moment preceding the moment of disturbance of the relation, and determination of the failed transducer by the results of the comparison.

EFFECT: expanded functional potentialities due to possibility of determination of the failed transducer in any excess system.

1 dwg

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