MMF VM30-H, Инструкция по эксплуатации, Страница: 18 / 58

The weighting filter to be used depends on the point where the vibrations enter the human body
and on the coordinate direction (Table 1). A difference is also made between the evaluation of
health risks and comfort.
Evaluation of health risks
Posture Location Direction
Frequency
weighting
K factor
sitting seat surface
X / Y
Z
W
d
W
k
1.4
1
Evaluation of Comfort
sitting
seat surface
X / Y
Z
W
d
W
k
1
1
footrest
X / Y
Z
W
k
0.25
0.4
backrest
X*
Y
Z*
W
c
W
d
W
d
0.8
0.5
0.4
standing footrest
X / Y /
Z
W
d
W
k
1
1
recumbent
pelvis
X (vertical)
Y / Z (horizontal)
W
k
W
d
1
1
head X (vertikal) W
j
1
undefined in buildings X / Y / Z W
m
1
Table 1: Application of the weighting filters *see notice on page 23
Only the filters W
d
for X and Y directions and W
k
for Z direction are relevant for the evaluation
of health risks. They are found in the filter menu as combination “Wd+Wk”.
13
Figure 8: Frequency weightings for whole-body vibration
0,01
0,1
1
10
0,1 1 10 100 1000
Hz
Wc
Wd
We
Wj
Wk
Wm