Vibration velocity is computed by single integration of the acceleration signal, displace-
ment by double integration. Due to integration there is a strong attenuation at high fre-
quencies which limits the measurable frequencies, particularly for displacement. Low
frequencies, including noise, are strongly amplified. High pass filtering is inevitable. The
frequency response curves of the general vibration ranges can be seen in Figures 27, 28
and 29.
20
Figure 27: Frequency ranges of vibration acceleration
0,1
1
10
100
1000
10000
0,01
0,1
1
10
a: 1Hz – 1kHz
a: 0,1 Hz – 2 kHz
Figure 28: Frequency ranges of vibration velocity
1
10
100
1000
10000
0,0001
0,001
0,01
0,1
1
10
v: 1Hz – 100Hz
v: 2Hz – 1kHz
v: 10Hz – 1kHz*