CESVA VC431, Руководство пользователя, Страница: 67 / 72

VC431
Instruction manual
65
5.2 Definition of functions
a
xy
RMS value of acceleration expressed in m/s
2
, defined by the expression:
 
dt t a
T
a
T
xy xy


0
2
1
a
xy
(t): instant acceleration according to time t and with frequency weighting
W
X
on the y axis, in m/s
2
T: duration of the measurement (evaluation)
a
mv
Total vibration value. The vibration resulting from the combination of the
translational vibrations of the three axes is defined by the expression:
2 2 2
+ + =
mz my mx mv
a a a a
a
wx
, a
wy
, a
wz
are the acceleration values of each one of the three orthogonal
axes x , y and z .
K
x
, K
y
and K
z
are the multiplication constants whose values depend on the
application of the measurement. For the frequency weighting w
m
, K
x
=K
y
=K
z
=1.
MTVV Maximum RMS value of mobile acceleration when the integration time is equal
to 1s.
A(8) Daily exposure to vibrations standardised for an 8-hour reference period.
o
hv
T
T
a A = ) 8 (
La
xy
RMS value of acceleration expressed in m/s
2
, defined by the expression:
) ·log( 20 =
0
a
a
La
xy
xy
a
0
: reference acceleration with value 10
-6
m/s
2