SU503374A1 - Device for detecting and localizing intermittent faults - Google Patents

Description

where t is the cumulative number of calls, and AiAz, B, Ci, € 2 are the coefficients depending on the allowable lower PQ value and the donable upper PI value of the probability of failure Rsb. the probability of an error of the first kind, when Hi is accepted, but actually the hypothesis is true, But, and the probability of an error of the second kind, when Yao's hypothesis is accepted, and in fact the hypothesis of Y, is true.

HL + 5 ™

or

 + Bm

The hypothesis of Yao is accepted, and if the condition

X Ci + В „, or X Сг + В, п

H.'s hypothesis is accepted.

The lines of blocks 6-9 of the data memory are pre-recorded in binary code the results of calculations, respectively, of the left and right parts of expression (1), the left and right parts of expression (2) for the values of the number of calls t V, 2v, ..., rv, where v is the number of calls in a group; g is the maximum number of groups that can be tested to accept one of the two hypotheses of Yao and HI.

When servicing a call by each of the monitored objects 2, the corresponding impulse is sent to the corresponding counter 3 of the number of calls assigned to this object. If the monitored object 2 fails, then the countdown pulse arrives at the corresponding counter 1 of the number of failures. The distributor 4 scans the counters 3 for the number of calls and the counters 1 for the number of failures corresponding to the monitored objects 2. At the moment when the distributor 4 stops on the corresponding counter 3 for the number of calls, information comes from it to the control unit 5. If at the time of the scan the accumulated number of calls t of the controllable object 2 is V, 2v,. . ., g, then control block 5 permits testing of the hypotheses of Yao and / ij in block 10 of comparison and analysis, from which a blocking signal is sent to the input of the distributor 4.

In the mode of detecting the Yao hypothesis, the control unit 5 reads information from the corresponding line of the data memory block 6 into the comparison and analysis unit 10. A sequential comparison is made of this information with information on the number of failures K accumulated up to a given moment, of the controlled object 2 supplied from the corresponding counter 1 of the number of failures via control block 5.

If, when comparing the information received by the Yao hypothesis, then from the output of the comparison and analysis unit 10, the signal about the hypothesis Yao enters the registration unit 11, from which the confirmation signal is sent to the control unit 5, at the same time permission is given to switch the distributor 4 to the next position

for analyzing the state of the next monitored device 2. From the control unit 5, the reset signal of the number of calls counter and the number 1 of the number of failures corresponding to the monitored object 2 for which the analysis is performed is not detected.

If, when comparing the information in block 10, the comparison and analysis of the hypothesis of Yao is not accepted, then the hypothesis H,

for which the control unit 5 reads information from the corresponding line of the data storage unit 7 into the comparison and analysis unit 10, where a bitwise comparison is made with the information accumulated to this

the time of the number of failures In a controlled object 2.

If, when comparing the accepted gynetosis Yaa, then from the output of the unit 10 of comparison and analysis, the signal of the gynetosis H comes to the unit 11 of registration. If, however, the comparison is not received by the gynetosis H, then the blocking signal is output from the output of the comparison block 10 to the input of the distributor 4, after which the next controlled object 2 is scanned.

If at the moment of scanning any controlled object 2 the necessary number of calls has not accumulated, then the blocking signal of the distributor 4 from the output of block 10

However, the analysis does not appear, and the distributor 4 proceeds to scan the next monitored object 2.

The operation of the device in the localization mode is carried out similarly to the operation in the mode

detection. It is excellent that the monitored objects 2 are tested with the help of control tests and are blocked from serving normal calls, and the control unit 5 reads information from the rulers

data storage unit 8 when testing the Yao hypothesis; and data storage unit 9 when testing hypothesis N.

Claims (1)

Invention Formula A device for detecting and localizing intermittent faults, containing counters for the number of failures, connected to the corresponding controlled objects, is so that, in order to increase the reliability of the device in the absence of a priori data on the intensity of the failure flows, to the output each monitored object is connected to a counter of the number of calls, whose additional inputs, as well as additional inputs of the counters of the number of failures are connected to the distributor, and their outputs to the control unit, the outputs of which through etstvuyuschie blocks of data memory and directly connected to the inputs of the comparison and analysis unit, as well as to the input of the registration unit, to the other inputs of which the distributor and the comparison and analysis unit are connected, with the comparison and analysis unit connected to the input of the distributor.