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Function
Vibration
Dose Value
(VDV)
VDV
shift
Vector Sum
(HARM)
Vector Sum
(WBV)
Dominant
Axis
(HARM)
Dominant
Axis
(WBV)
Partial Ai(8)
(Vector Sum)
Partial Ai(8)
(Dominant
Axis)
Daily
Exposure
T
VDV
0
T = total measured integration time (seconds)
a
(ta) = instantaneous acceleration value
w
VDV
shift
VDV = Vibration Dose Value
Exp = Exposure Time (Seconds)
t = Measurement Log Duration (Seconds)
VSum
VSum
Largest Aeq value from the X, Y and Z axis readings
Largest Aeq value from the X, Y and Z axis readings
Where the X and Y axis are subject to a multiplication
Ai 8 ( )
Vsum = Vector Sum (HARM or WBV)
Exp = Exposure Time (Seconds)
Ai 8 ( )
dom = Dominant Axis (HARM or WBV)
Exp = Exposure Time (Seconds)
A 8 ( )
Ai 8 ( )
Ai(8) = Partial Exposures (Vector Sum or Dominant Axis)
Page 121
Equation
4
a
( )
ta
d
( )
ta
w
(ta) = time (seconds)
0.25
Exp
VDV
t
2
X ( )
Y ( )
X = X Axis Aeq
Y = Y Axis Aeq
Z = Z Axis Aeq
2
(
1.4X
)
(
1.4Y
X = X Axis Aeq
Y = Y Axis Aeq
Z = Z Axis Aeq
factor of 1.4
Exp
Vsum
28800
Exp
dom
28800
2
Ai 8 ( )
1
2
1
4
1.75
ms
1.75
ms
2
2
Z
2
2
)
Z
2
2
Ai 8 ( )
n
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