5 Velocity, PeakVue, and temperature
Topics covered in this chapter:
• Overall Velocity
• PeakVue
• Temperature
5.1 Overall Velocity
The Overall Velocity measurement provides a summation of the low-frequency vibration
energy, which indicates fault conditions such as imbalance, misalignment, looseness, and
late-stage bearing problems.
The CSI 9420 uses (lower-frequency) Overall Velocity in conjunction with (higher-
frequency) PeakVue to provide a holistic solution across all frequencies while optimizing
the usage of the limited power and bandwidth available in a wireless device. The majority
of developing fault conditions manifest in one or both of these key parameters.
The difference between the standard vibration waveform and the associated PeakVue
waveform is shown in Figure 5-1 and Figure 5-2. Overall Vibration indicates energy from
shaft rotation, expressed in units of RMS velocity per the ISO 10816 standard. PeakVue, on
the other hand, filters out the rotational energy to focus on impacting. Impacting is
expressed in units of Peak acceleration. This indicates key mechanical problems such as
rolling element bearing faults, gear defects, and under-lubrication.
Velocity, PeakVue, and temperature
MHM-97408, Rev 15 91
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