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The
data required often comes in three forms:
- Overall vibration severity
- Vibration (or noise)
spectra where the amplitude of peaks
are plotted against frequency.
- Phase diagram where
the direction of the vibratory motion
at the measurement position is shown
by a vector.
To obtain a spectrum requires
one accelerometer to be placed at the
measurement position. Usually this would
be at the bearing positions, where the
vibration levels have been shown to
be highest but can also be on the bedplate
or the machine feet.
Data Retrieval
and Analysis
Stored data can be transferred
to a PC via USB, Infra Red (IrDA), RS232
serial ports or memory card. The data
is in comma separated values (*.csv)
but will appear as a Microsoft Excel
spreadsheet.
The data can be used in
various ways. For example;
- Plotting vibration
data versus machines tested to trend
changes in quality
- Viewing vibration spectra
to make to diagnose a problem
- Archival of reference
vibration signatures for future comparison
with data taken after installation
or service period
- Plotting vibration
data versus time to trend changes
in machine health
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