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Table 3.2 – Data for solving Task 3.6

Initial data Variant

0 1 2 3 4 5 6 7 8 9 10

а, mm 26 25 24 23 22 21 20 22 23 24 25

b, mm 26 25 24 23 22 21 20 22 23 24 25

L ind. , mm 10,5 11 10 9,9 9,8 9,7 9,6 9,7 9,8 9,9 10

L, cm 62 61 59 58 57 55 55 56 57 58 60

t ,s 0,30 0,29 0,28 0,27 0,26 0,25 0,24 0,25 0,26 0,27 0,28
ev.

Task 3.7. To estimate the information business of operator during 8-hours
working day, if the time during which the operator is busy processing information,
makes 6,4 hours.
Task 3.8. The system of process management includes operator and three
technicians, what are adjoined consistent. Or will ensure the operator the required
speed of operation the system of process management at given conditions: the
signal delay time by each machine mechanism 1,2 s; 1,7 s; 0,8 s; Information
value, which circulates within one cycle 21 points; the velocity of information
processing by operator is 3 points/sec.; the average expectation time of information
in course of service by operator is 2 s ; the cycle of regulation must not exceed 14
sec.
Task 3.9. To determine for which from the drilling rig the locations of
drawworks is more corresponds the demands of safety during operations for such
conditions:
БУ 80 БрД: length and breadth receiving bridge respectively 14 and 2 m; the
2
reception area of the bridge, which is in driller’s sight – 23 m .
БУ 2500 ЕУ: length and breadth receiving bridge respectively 16 and 2 m;
2
the reception area of the bridge, which is in driller’s sight – 30 m .
Task 3.10. To determine time from driller’s reaction to increased
concentration of gas in well working premises to shutdown of top and bottom
preventors to prevent well flowing. Time required for the shutdown of each
preventor, makes 0,4 sec., the time for audio signal about increase concentration
gas to dangerous 0,15 sec.; the time of involuntary driller’s distraction 0,14 sec.

5 REVISION QUESTIONS
1. What does the "human-operator" system mean?
2. What are the distinguishing features of the operator?
3. What determines the effectiveness of a human-operator?
4. What are the main stages of activities of the operator?
5. What are the reasons for reducing the reliability of the operator and what

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