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Entry type: FAQ Entry ID: 38702101, Entry date: 10/02/2009
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Measured variables of the vibration recording

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QUESTION:

 

 

 

 

 

Which measured variables record vibrations at electric motors?


ANSWER / REMEDY / NOTES:

  

 

 

 

 

Measured variable

Vibration
(Application example)
Frequency range Subjecvtive
perception

Vibration displacement

[µm]

Shaft
vibrations
1 Hz to 0.4 kHz

Vibration velocity

[mm/s]

Enclosure
vibrations
10 Hz to 1 kHz

Vibration acceleration

[m/s]

Gearbox
acoustic emission
10 Hz to 20 kHz

Shok pulse measurement

[dBc; dBm]

Roller bearing
acoustic emission
30 kHz to 40 kHz
     
    The variables, which are listed in the table in the form of sinusoidal vibrations, are closely related to each other and can be calculated as follows:

 

 

 

 

 

Conversion

Vibration
displacement
s [mm]
Vibration
velocity
v [mm/s]
Vibration
acceleration
a [m/s2]
Vibration displacement [s] 1 s = v/ω s = a/ω2
Vibration velocity [v] v = s x ω 1 v = a/ω
Vibration acceleration [a] a = s x ω2 a = v x ω 1

 

 

 

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