Vibration terminology
Vibration means the state of an object moving repetitively back/forward, right/ left or up/down and is generally expressed by Frequency, Displacement, Velocity, and Acceleration. These 4 elements are generally denoted as F, D,V,A. This is illustrated simply as a spring and mass. When the mass is pulled down from the start position and released, the mass moves just like the vibration waveform shown in the graph on the right.
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- Frequency means the number of times that vibrating object generates a repetitive motion in 1 second.
- Unit:Hz
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- Displacement means the amplitude (distance) between the peaks of vibration.
- Unit:μm, mm
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- Velocity means the changing rate of displacement (D) to time
- Unit:mm/s, cm/s
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- Acceleration means the changing rate of velocity(V) to time
- Unit:m/s2, g
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- Effective function to detect abnormal bearing noise. 2kHz~15kHz filtering to acceleration waveform can remove noise for waveform analysis.