SU1472937A2 - Operatorъs preparation level tester - Google Patents

Abstract

The invention relates to technical means of control and can be used to assess the level of training of operators. The purpose of the invention is to expand the didactic capabilities of the device by implementing in it the possibility of estimating the rational time of continuous operation of the operator in the control system. The device contains information output unit 1, analysis unit 2, response input unit 3, operator preparation level determination unit 4, assessment indication unit 5, operator’s workplace 6, first 7 and second 10 pulse shapers, first 9 and second 13 adders, block 8 registration, the first 11 and second 12 adjustable amplifiers, the source 14 of the reference voltage, block 15 comparison. The rational time of continuous work of the operator is determined on the basis of the choice of an alternative that has the maximum degree of belonging to a fuzzy solution depending on the level of losses from operator errors and the costs of its psychological and functional rehabilitation. These alternatives are defined by the purpose and constraint membership functions generated by special function transducers, which are controlled based on the number of errors made by the operator during training. The change in the predicted operator time at a certain scale is modeled by a special generator, the number of pulses of which is counted by a counter. The determination of the maximum is carried out in the comparison unit, which produces a breakdown of the generator. Operator hours are determined by meter readings. 9 il.

Description

The invention relates to technical means of control and can be used to assess the level of training of operators.

The purpose of the invention is to expand the didactic capabilities of the device by realizing in it the possibilities of determining the rational time of continuous operation of the operator in the control system.

FIG. 1 shows a block diagram of the proposed device; in fig. 2 is a block diagram of a first pulse former; in fig. 3 is a block diagram of a second pulse former; in fig. 4 is a block diagram of a comparison block; Fig. 5 is a block diagram of a block for determining the level of operator training; in fig. 6 is a block diagram of a minimum detector; in fig. 7 is a block diagram of a source of reference voltages; in fig. 8 is a block diagram of the first Ј second) adder; in fig. 9 is a graph of the dependence of the voltages at the outputs of the integrators

The device (Fig. 1) contains the information output unit 1, the analysis unit 2, which is a decoder, the operator response input unit 3 (key set), the operator preparation level determination unit 4, the rating indication unit 5, the operator’s workplace 6, the first driver 7 pulses, registration unit 8, first adder 9, second pulse shaper 10, first 11 and second 12 adjustable amplifiers, second adder 13, reference source 14 and comparison unit 15.

Block 1 is intended to show the task to the operator, 5 block 2 - to analyze the accuracy of the tasks performed by the operator, block 4 - to generate signals that determine the level of operator training, Passed, Not passed, Continued testing.

The first driver 7 is designed to generate a code corresponding to the predicted rational operating time of a given operator in the control system in question, and the second driver 10 pulses to generate a voltage proportional to the time the task is completed by the operator. Execution time

The job is measured from the moment it starts being presented to the operator until the signal is received. Passed from the second output of block 4, determining the operator's training level.

5 The first 9 and second 13 adders are connected to generate voltages proportional to the predicted values of the target membership functions ffd (C, t) and constraints / con (CrO.

0 Comparison unit 15 is designed to determine the extremum of the function of function rain C (C, O: Me (C4t) 5) over the predicted time interval.

The second driver 10 (Fig. 2)

5 contains a serially connected counter 16, a digital-to-digital converter 17 and a pulse generator 18.

The generator 18 is started according to the signal of unit 1 with the start of issuing the first task to the operator. Disruption of the generator 18 is carried out on command. Passed from the second output of block 4.

The first driver 7 pulses (Fig. 3) contains the counter 19, the generator 20 and the toggle switch 21 start.

Comparison unit 15 (FIG. 4) comprises a first integrator 22, a comparator 23, a second integrator 24, and a minimum detector 25.

The operator qualification level 4 unit includes a digital-analog converter 26, first and second adders 27 and 28, first comparison circuit 29, AND element 30, second comparison circuit 31, third adder 32, reference condition sensor 33, fourth adder 34 and multiplier 35 .

The minimum detector 25 (FIG. 6) contains the first 36, second 37 and third 38 inverters, diodes D) and D2 and the load resistance R.

The reference voltage source 14 (FIG. 7) contains adjustable sources 39 and 40 of reference voltages, the source 39 being designed to form a voltage proportional to the coefficient (C,) of cost costs associated with eliminating the consequences of a single operator error, and source 40 - to form a voltage proportional to the coefficient (Cj) of the cost of psychological and functional rehabilitation of the operator.

The adder 13 (9) contains the amplifier 41 and the switch 42. The switch 42 provides the connection of various resistances from the resistance box in the feedback circuit of the amplifier 41, changing its transmission coefficient. The switching of resistances is carried out in accordance with the code of the number taken from the output of the first driver of 7 pulses.

The first amplifier 11 is controlled by a digital code received at the input of the DAC 26 located in block 4.

The device works as follows

Before testing by adjusting the sources 39 and 40 of the reference voltage, the device exposes cost coefficients associated with the elimination of the last

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the consequences of one operator’s error (C0) in this control system and the organization of its functional and psychological rehabilitation (C). The parameters of Cc and Cr at a certain scale correspond to the voltage of sources 39 and 40. Their values are calculated in advance based on the analysis of the results of the operator’s activity in the control system, as well as on the basis of the analysis of the characteristics and effectiveness of the applied means of psychological and functional rehabilitation of the operator.

In addition to this, in accordance with the laws of time variation of the membership functions pg (C) and b (), switched switches 42 are set in the feedback circuits of amplifiers 41 of adders 13 and 9, which together with the corresponding switches function as

functional converters.

The test subject is given through block 1 to solve a problem, after solving which he enters the answers through block 3 to input into block 2 of analysis, which, based on a comparison with the standard coming from block 1, generates a signal about the entered answer and its error for block 4 preparation. Unit 4, based on the analysis of the number of errors, m generates the signals Passed or Not passed, arriving at the indication unit 5. Simultaneously with the start of issuing the first task, a command of unit 1 starts the generator 18 of the generator 10, which generates time counting pulses fed to the input of the counter 16. As the tasks are completed from the first output of the unit 4, determining the operator's training level to the second input of the first adjustable amplifier 11, a voltage is supplied proportional to the number m of erroneous decisions of the operator when the task is performed. The gain of amplifier 11 varies inversely with the voltage taken from the output of the digital-to-analog converter 17 of the driver 10, the value of which corresponds to the time code t of counter 16.

Disruption of the first generator 18 is carried out on command. Passed from block 4o.

Thus, at the end of the test of the operator, at the output of the first amplifier I, a voltage is generated proportional to the error rate of the test operator, i.e. BUT

m

 -. Voltage taken from

output

amplifier 11 provides for setting the gain of amplifier 12 in proportion to the intensity of operator error. The information of the second input of the amplifier 12 is supplied with voltage from the reference source 39. At the output of the amplifier 12, a voltage proportional to the product C, CA is generated, which then goes to the input of the adder 13 "

After receiving the signal, the researcher closes the toggle switch 21, through which the voltage of the external source goes to the generator 20 of the driver 7 and starts it. The generator 20 produces pulses corresponding to the predicted operating time of the given operator in the control system in question. The number of pulses of the generator 20 is counted by the counter 19, the signals from the output of which control the operation of the switches 42 in the adders 13 and 9. Under the influence of the control signals from the counter 19, the switches of the adders 13 and 9 provide a serial connection in the feedback circuits of amplifiers 41 of different resistances, providing a change in the transmission coefficients of the adders 13 and 9. Thus, the output of the adders 13 is formed by a voltage proportional to the change of the membership function (UA () in time, which depends on c the cost of eliminating the consequences of operator errors and their intensity, and the type of this dependence is established by changing the corresponding resistances in the resistance box of the switch of the adder 13. Similarly, the dependence of the membership function c () of the restrictions on the output of the adder 9 is formed. The voltages taken from the outputs of the adders 13 and 9 are compared. For this, the compared voltages from the outputs of the first and second adders are interconnected by inverters 36 and 37, and then agodar action

negative feedback on the resistance R allocates the maximum inverted voltage, which is again inverted by the inverter 38. At the output of the counter 16, there is a minimum voltage corresponding to the minimum value of the target membership function and the limit, which, in accordance with the change of the prediction time code on the counter 19 also varies with time. Since the tendencies of growth of the objective membership functions and the constraints are directly opposite, the function of their minimum solution of the problem has an extremum.

The extremum of the minimum function in comparison block 15 is found with the help of two integrators 24 and 22 and a comparator 23. Since the minimum function is inseparable, the voltage removed from the output of the second integrator increases with increasing time faster than at the output of the first integrator. By knowing the form of the minimum function of time, one can choose the parameters of the constant integration time of integrators 24 and 22, at which the equality of the voltages (U7 and Ut) at the 0 outputs of the integrators 24 and 22 will be achieved exactly at the maximum of this function. FIG. 9 shows an example of the dependence of the voltages at the outputs of the first U1 and second U integrators. A 5 m long pulse of a rectangular shape with a duration T. The outputs of the integrators 24 and 22 of block 15 are connected to the inputs of comparator 23. At the time of coincidence of the voltages, the comparator 23 is triggered and provides a breakdown of operation of the generator 18. In this case, the code recorded on the counter 19 rational time of continuous work of the operator in the system, which takes into account the psychological state of the operator, his individual characteristics and the nature of the cost of costs. The readings of counter 19 are recorded by registration unit 8 in decimal form.

Consider the work of the level 4 training unit for the case of a two-point assessment of the level of training (Fig. 5).

In this case, the device checks the following relationships:

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m Ј A, + A0. P; m -, Aa + AO p;

BUT,

- In / - In (1 - fi)

In Pr (1-P,), (1-RDG

A In (1 - PQ - In (1 - Pi). 0 InCPjCl-P FbTT, (-,)

. In (1 - P.) - Inrf

A1 (l-P,) (l-Pi)

where Pt is the maximum percentage of errors for

Pg estimates are the maximum fraction of errors for

No ratings

o - the greatest likelihood that a really poor student is rated as poor;

0 - the greatest likelihood that a truly unprepared student is rated as prepared.

The values of the coefficients of the values A0, A., A, - are calculated in advance by the above formulas and set by the experimenter by means of the sensor 33 of the baseline conditions of the control.

The value of n, equal to the number of presented tasks, is formed at the output of the adder 27 and is fed to the first input of the multiplier 35. The second input of the multiplier 35 receives a signal about the value of A0 from the sensor 33 of the reference conditions of the control. A signal equal to A6-p is fed to the first inputs of adders 34 and 32. The second input of adder 34 receives a signal from multiplier 35 equal to A15 and the second input of adder 32 has the value A.

From the output of the monitor 34, a signal equal to A, + A0-p is fed to the first input of the comparison circuit 31, and from the output of the adder 32 a signal equal to A g + A0 x x p is fed to the first input of the comparison circuit 29. The second inputs of the comparison circuits 29 and 31 receive a signal equal to the number of erroneous solutions generated at the output of the adder 28. The comparison circuits 31 and 29 check the above inequalities. There may be two outcomes: either one of the inequalities is satisfied, or both inequalities are not satisfied. In the first case, the corresponding comparison circuit generates a signal to the evaluation indication unit 5. If this signal comes from block 3, then block 5 indicates the estimate.

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0 35 40

45 "JQ 55

Passed, and if from block 29 - I did not pass. In the second case, the circuits 31 and 29 generate signals arriving at the inputs of the AND 30 element, which generates a signal to continue the tests for unit 1.

Digital information about the number of erroneous decisions comes from the output of the adder 28 to the input of the digital-analog converter 26. The voltage proportional to the value of m then goes to the amplifier 1I.

For the case of a 1-point assessment, the baseline sensor 33 sets the baseline monitoring conditions and the level 4 training unit 4 consists not of two chains (Fig. 2), but of 1 chains, i.e. contains 1 blocks of adders and 1 blocks of comparison

Thus, the invention allows simultaneously with the assessment of the operator's performance to obtain data on the rational time of its continuous operation, minimizing the cost losses associated with the elimination of the consequences of operator errors and the restoration of his psychological and functional state.

Claims (1)

Invention Formula A device for monitoring the level of training of operators for auth. St. No. 903940, characterized in that, in order to expand the didactic capabilities of the device, the first and second pulse formers, the first and second adjustable amplifiers, the first and second adders, the comparison unit, the source of reference voltages and the registration unit, the input connected to the output of the first pulse shaper and with the first inputs of the first and second adders, the second input of the first adder is connected to the first output of the source of the reference voltages, the output of the information output unit - with the start input of the first photo pulse generator, whose stop input is connected to the first output of the operator’s training level, the zero input is combined with the second zero driver zero input and is the device zero input, the output of the first pulse driver is connected to the information input of the first adjustable amplifier, the control input of which is connected to the second output of the unit determines the level of the operator’s training, and the output - with the information input of the second adjustable amplifier, whose control input from It is connected to the second output of the reference voltage source, and the output is connected to the second input of the second adder, the output of which is connected to the first input of the comparator unit, the second input of which is connected to the output of the first adder, and the output to the prohibition input of the second pulse conditioner. I S21 9 (M) FIG & 5 T FIG. 2 3 i FIG. 6 nineteen i riЈ W) M Fig.8 39 40 t-t / 224 FIG. 7 U U2  Uf +25 T / 2 FIG. 9