SU1327139A1 - Apparatus for determining optimal period of articles maintenance - Google Patents

Abstract

The invention relates to specialized computational tools and can be used in determining the maintenance parameters of systems whose subsystems are integrated by a single process of functioning. In addition to the optimal service period, the device provides a determination of the amount of maintenance of the system, which expands the functionality of the device. The device contains information input unit 1, delay element 2, counters 3, 14, time sensor 4, elements AND 5, 15, nonlinear conversion units 6, elements 7, 11, integrator 8, division unit 9, comparison unit 10, recorder 12 and a decoder 13. The determination of the scope of maintenance is achieved by sequentially calculating the reliability functions of all the subsystems of the i-: task. 2 Il. (L

Description

The invention relates to specialized computing devices and can be used in determining the maintenance parameters of systems whose subsystems are integrated by a single operation process and are only brought into service in fixed, in advance

certain time intervals. From the point of view of reliability, such systems are, for example, automated production lines, computers, complex radio electronic systems, etc.

The purpose of the invention is to expand the functionality of the device by determining the volume of maintenance of the system.

The determination of the amount of maintenance is carried out according to the criterion of maximum system availability. The availability factor of each subsystem is determined from the expression

R; (t) dt

Ti

Where

H :.

the maintenance period of the i-th subsystem, p. (t) is the reliability function of the i-th subsystem.

Period t. may take one of the possible values depending on the accepted for the whole system of regulation of types of technical service;

i

.

- the number of types of technical

service,

1, if the i-subsystem is serviced in the J-M form of technical maintenance of the systems, O, otherwise, the ratio of the prepared subsystem can take on possible values depending on the selected frequency of its injection:

J K,

 ri

I CC,.

jsi j

The choice of a specific maintenance frequency for each subsystem leads to the fact that each service type of the system will be delivered in accordance with a certain number of subsystems, the maintenance period of which is chosen equal to the regularity of this service type. This means that thereby the task of determining the amount of maintenance for each type will be solved.

The structure of a large number of systems

0

It is a series-parallel connection of subsystems. The expression for the availability factor of such systems is the product of groups of factors of the form P and l-P (I-K). The maximum availability of the system in this case is achieved with the maximum availability of the individual systems. This means that the solution to the problem of determining the volume of maintenance of the system consists in assigning the maintenance operation by each subsystem to that type of maintenance, at which the value of the subsystem's maximum availability is maximum. The operation of the device is based on this algorithm.

FIG. 1 shows a block diagram of the proposed device; in fig. 2 - functional block diagram comparison, option.

A device for determining the optimal period for servicing a product includes an information input unit 1, delay element 2, first counter 3, time sensor 4, main retract element AND 5 /, additional second elements AND 5--5,;

0

five

0

five

0

five

main block 6 non-linear conversion, additional blocks 6, -6, non-linear conversion, first element OR 7, integrator 8, block 9 division, block 10 comparison, second element OR 11, recorder 12, decoder 13, second counter 14, first element AND 15.

Unit 10 contains a comparison element 16, an AND element 17, a delay element 18, a one-shot 19 and a memory element 20.

The facility operates as follows.

Before starting work on block 1 (representing, for example, a dial-in field, the dialing is carried out using switches or buttons), the frequency of the types of maintenance set for the system, i.e. T-values, and recorded in the time sensor. Information about the number of types of maintenance through the second input is fed to the first counter 3, setting its maximum size. Through the second outputs of block 1, the blocks 6 of the realizing functions P (t) are adjusted.

 with the start of operation, sensor 4 through the first output sets, in order of increasing, a sequence of possible values of T. periods of system maintenance. Each value T. is accompanied by a gating pulse that appears at the second output of sensor 4. The value T passes through one of the elements AND 5 to the input of the main unit corresponding to the first of the subsystems of the system under consideration. The values of the function P. (t) are sent through the first element OR 7 to the integrator 8. The upper limit of the integration is determined by the current value of the first output.

sensor. With the integrator signal, sootf

P. (t) dt, arrives at

about

The first input of dividing unit 9, to the second input of which the current value T is received from sensor 4. To the third strobe input of dividing unit 9 by KK 1 (g - d) The maximum value of K is reached by a maintenance period 25 equal to T-j. The impulse c i of the comparator does not come, but an overflow pulse appears at the output of the first counter 3, since its maximum set from the control panel is equal to I. The overflow impulse goes to the second input of the element 15. The first input of this element connected with the output of the comparison unit 10, is

thirty

inverse. Therefore, in the absence of an impulse, an accompanying value is given.

“J -“ jb of the signal at the output of the unit 10

f, fT ft T f -T. TTOT YTTJtrO il TETL O

the pulse from the second input of the element 15 passes to the input of the recorder 12. When a pulse appears, this output of the recorder records the output number of the decoder 13 with a high potential and the current value of the signal that is

T: from the second output of the sensor 4 time. The duration of its delay on element 2 is equal to the time of passage of the signal through element 5 of block 6, first element OR 7, and integrator 8. When a pulse appears at the third input of division block 9,

40

at the input of the recorder T

12, i.e. Znachishyvanie result of division, corresponding li-corresponding to the value of K

YY

P, (t) x 45

55

dt / T-, in block 10 of comparison, where (so with the arrival of a strobe pulse 0

where I

ca) compares this result with the previous KpM ..., j readiness value. In the first step, the value of Krij is compared with zero. A sequential comparison for j 2,3, ... continues until

K How

while the values increase with increasing J. As soon as the values of KC, -: begin to decrease, i.e. when the inequality K.;, K (- (1) is fulfilled for the first time), the output of the comparison unit 10 is

an impulse, This impulse indicates that the maximum K is reached with a maintenance period equal to Tj.,. The considered impulse passes on. one of the inputs of the recorder 12 and, when it appears, it fixes, firstly, that number of the decoder 13, on which there is currently a high potential, secondly, the value T-, received to the recorder at the previous step. This means that the subsystem number (in this case, the first one) and the corresponding best subsystem of this subsystem are recorded on the registrar g.

If the values of K, the values of j I are possible. two cases:

0

Lg, -; increase to -. 1, then on the J-M step

1 TO

gi

K 1 (g - d) The maximum value of K is reached by a maintenance period of 5, equal to T-j. The impulse c i of the comparator does not come, but an overflow pulse appears at the output of the first counter 3, since its maximum set from the control panel is equal to I. The overflow impulse goes to the second input of the element 15. The first input of this element connected with the output of the comparison unit 10, is

0

40

at the input of the recorder T

five

2) To

go value

 TO

g- | (s-1)

12, i.e. valueMaximum

0

is reached when the service period is Tj. The pulse from the output of the comparison unit 10 is fed to the first inverse input of the element. And 13, prohibiting the passage of an overflow pulse from the output of the first counter 3 to the fourth input of the recorder 12. When the pulse from the output of block 10 is received, the value of the technical maintenance period of the previous step, i.e. Tj.,.

The impulse, indicating the end of the procedure for selecting the service period of the first subsystem (coming either from the output of block 10 or from the output of counter 3), passes through the second element OR 11. The pulse section sets the first counter to the zero state 3, also to the zero state The reference voltage adjuster is transferred in comparison unit 10, preparing these elements for the selection of the maintenance period for the next subsystem. A cut-off of the indicated pulse causes the sensor 4 to restart time through its second input and increase the content of the second counter 14 by one. Accordingly, a high potential will now be present at the second of the outputs of the decoder 13 and the signals from the first output of sensor 4 will pass through the black (23 first additional first element AND 5 to the second block 6.j implementing the function P2 (t). The operation cycle of the device repeats.

Upon completion of the procedures for selecting service periods for all subsystems, the registrar 12 will record the possible values of the system maintenance periods and the subsystem numbers corresponding to each of the specified service periods, i.e. The system maintenance levels will be determined.

In order for the comparison unit 10 to perform the functions described in the device, it can be performed, for example, in the form shown in FIG.

At the output of the comparison element 16, the signal appears only when the amplitude of the signal at its input, connected to the output of dividing unit 9, is smaller than at the output, connected to the output of memory element 20. The comparison is carried out in the presence of a strobe pulse, supplied to the comparison element 16 from the output of the sensor 4 via the delay element 2. With the help of a strobe pulse through the element 17, the amplitude value of the signal arriving at the first input of the block 10 in the element 20 is memorized. Due to the presence of the delay element 18, the memory is memorized after the next comparison operation. The value recorded in element 20 is used on the jaw to perform a comparison operation. When a signal appears at the output of the comparison element 16, a single vibrator 19 is triggered, which forms a rectangular pulse with a duration not less than the pulse width; overflow of the first counter 3. Such a condition is necessary for effectively performing the operation of prohibiting an overflow pulse through an element 15. After completing the procedure for selecting the service period of the next subsystem, the element 20 is zeroed by cutting the pulse from the output of the second element OR 11.

Thus, with the help of the device, the choice is made not only of the maintenance intervals for relatively simple products, but also the amount of technical maintenance is determined. serving systems that include simple products as subsystems. The device is applicable for determining the scope of maintenance of a widespread class of complex systems, namely, systems that can be taken out of service only at certain, pre-planned time intervals and at specified intervals. Determining the maintenance parameters for serial-parallel or parallel-serial systems (for example, automated process lines, data paths, etc.) using a device, allows you to maximize availability - one of the most important indicators of system reliability.

Claims (1)

Invention Formula A device for determining the optimal maintenance period for a product, comprising an information input unit, first and second elements AND, a non-linear conversion unit, an integrator whose output is connected to the first input of the division unit whose output is connected to the first input of the comparison unit whose output is connected to the first input the first element And, the output of which is connected to the first input of the recorder, and the time sensor, the first output of which is connected to. the second input of the dividing unit, characterized in that, in order to expand the functionality of the device by determining the amount of maintenance, additional blocks of nonlinear conversion are introduced into it; No, additional second elements AND, elements of CLI, delay element, snnetchik and decoder, the first output of the time sensor is connected to the second input of the recorder and the first outputs of the main and additional modes of the main and additional second elements And, the outputs of which are connected to the first inputs the main and additional, nonlinear conversion units, the outputs of which are connected to the integrator input through the first IZh element, the first data source of the information input unit is connected to the first time sensor input, W the output of which, through a delay element, is connected to the third input of the division block, to the first input of the first counter and the second input of the block From / y Fib, 2 Compiled by G. Usachev Editor M. Bandura Tehred V. Kadar 3392/47 Circulation 469 VNIIPI USSR State Committee for Inventions and Discoveries 4/5, Moscow, Zh-35, Raushsk nab. 113035 Sign up Production and printing company, Uzhgorod, st. Project, 4 9 -.8 comparison, the output of which is connected to the third input of the recorder and the first input of the second element OR, the output of which is connected to the third input of the comparison unit, to the input of the second counter and the second inputs of the time sensor and the first counter, the output of which is connected to the second inputs of the first element And the second element OR, the output of the second counter through the decoder is connected to the fourth inputs of the recorder and the second inputs of the main and additional second elements AND, the second outputs of the information input unit are connected to the second input m of the main and additional nonlinear conversion units, the third output of the information input unit is connected to the third input of the first counter. Corrector S.Cherni . - -..... Subscription