Ergonomics as Significant Factor of Sustainable Production - Technology Management for Sustainable Production and Logistics - page 195

OP3

80%

60%

OP1 OP6

40%

20%

1
2
3

0%

OP4 OP5

Legend:
OPX -operator no X
1,2,3 -number of
production shift

OP2

Fig. 3 Visual inspection effectiveness for single operator in three shifts working system (own source)

Table 3 FPY index value
of quality effectiveness for
different operators working in
three shifts working system
and job experience range
(own source)

Operator Job experience

(year range)

Average effectiveness
of operators in FPY (%)
Production shift
1

2 3

1-5 64 49 51

OP1

OP2 6-10 54 72 75

OP3 6-10 36 32 43

6-10 51 52 47

OP4

OP5 >15 55 62 45

OP6 >15 63 74 67

row better on night shifts (ex. OP2 and OP6). This diversity relates to unique human
biorhythm. This factor divides population of operators into subgroups characterized
with proper per hour work effectiveness during day and night. Unfortunately day
and night effectiveness of performed tasks is variable and also dependent on other
influencing factors. As an example can be listed situation context, daily mood, health
discomfort or musculoskeletal disorders. Impact of that additional factors is visible
in lower work effectiveness level. Additional (“disturbing”) factors make up risk
parameter and mostly appears sporadically and accidentally.
Paying attention to biological rhythm of operator activity already on stage of
recruitment for controller position enable to limit to possibly maximum extent
human errors appearance, especially failure of missed defects. Moreover ergo-
nomic work organization drawing attention not only to single operators biorhythm
but also to proper working conditions on work places should result in effectiveness
of visual inspection as well as other production processes increase.