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where Y – indicator of fatigue.
The indicator of fatigue in relative units is calculated using the formula:
Y  13 . 53  2 . 43X , (3.11)
where Х – indicator of working conditions, points.
The indicator of working conditions, or the degree of harmfulness of
production factors is given in “Hygienic Classification of Labor” and it’s

determined taking into account the duration of action of these factors during
working hours.
Х  X f Т d , (3.12)

where Х – degree of harmfulness of production factor;
f
Т – ratio of the duration of impact of the factor and the duration of the shift.
d
For indirect assessment of the system “Human – Machine” the formula of
comparing mathematical expectation is used:
y  y   y tol . , (3.13)
x
e
, y – current and reference value of the mathematical expectation of
where y x e
parameter, that is defined (e. g., the time of realization);
Δy – permissible deviation of mathematical expectations.
tol.
The permissible deviation of mathematical expectations is defined as:

 1 1 
 tol .  t  2    ,  (3.14)

 N x N e 
where t – statistical criterion of comparing of the mathematical expectation (e.g., t–
Student's criterion);
σ – root mean square deviation of the value, which is determined;
N , N – amount of observations, the results of which are determined by the
е
x
mathematical expectations y ,y .
x
e
When placing the drawworks the degree of view by a driller of receiving
bridge is calculated by the coefficient of view:
S
К  r .a . , (3.15)
v
S tot .
2
where S – area of the receiving bridge, which is in sight driller, m ;
r.a.
2
S – total area of the receiving bridge, m .
tot.
If a driller can’t observe the work of his assistants throughout the receiving
bridge, it may be a cause of accidents, especially in the case of the jointing of a
drilling column or the descent of casings.

4 TASK OF CLASS
4.1 Before meeting on class, students should study basic theory of the
activities of human-operator. All students are expected to come to class alert and
ready to participate in discussion.
4.2 Students in the classroom at the request of a teacher give answers on the
questions.

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