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Figure 3: Frequency response curves for acceleration
.3. Vibration Velocity
Measuring vibration velocity is a common procedure for assessing the running smoothness of rotating machines. Vibration velocity, commonly known as
vibration severity, represents the energy expenditure of occurring vibrations. Vibrations are caused by rotational unbalances, for example as a result of loose
screws, bent parts, worn or slack bearings or dirt residues on the fan blades. Often several factors have a mutually reinforcing effect. Besides rotating machines,
the measurement procedure is also suitable for reciprocating machines.
The specifications of vibration velocity measuring instruments are described in ISO 2954. In the ISO 2954 a band filter for the vibration velocity of 10 to 1000 Hz
is defined.The displayed value of the vibration severity is the true
RMS.
Besides the frequency range of 10 to 1000 Hz, the PCE-VM 25 has a further frequency range for vibration severity measurements from 2 to 1000 Hz. This is
suitable for measurements on slow running machines with a nominal speed of less than 120 min-1 and on reciprocating engines according to ISO 10816-6.
The corresponding PCE-VM 25 frequency response graph can be viewed here:
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Figure 4: Frequency response curves for velocity
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