Chapter 1
Introduction to the LabVIEW Order Analysis Toolset
LabVIEW Order Analysis Toolset User Manual
1-4
ni.com
Example VIs
If you have experience with order analysis, the example VIs, located in
the
examples\Order
Analysis
directory, can help you learn how to use
the LabVIEW Order Analysis Toolset. The example VIs illustrate the
following LabVIEW Order Analysis Toolset functions for both analog
and digital tachometer signal processing:
•
Acquiring data
•
Presenting data
•
Gabor order tracking
•
Resample order tracking
The example VIs use VIs found on the LabVIEW Order Analysis Toolset
palettes and illustrate the basic capabilities of the LabVIEW Order
Analysis Toolset.
Acquiring Data for Example VIs
For most of the example VIs, you can use prerecorded data or data you
acquire with data acquisition (DAQ) hardware. The example VIs that
accept either prerecorded data or acquired data have a Boolean control
named
Data Source
. The
Data Source
control has two choices,
Example
and
DAQ
. When you choose
Example
, the VI uses prerecorded data
generated during a fan run-up as the data source. When you choose
DAQ
,
the VI uses data you acquire with DAQ hardware.
When acquiring data through DAQ hardware, National Instruments
recommends you follow the following guidelines:
•
Use an anti-aliasing filter before data acquisition to avoid the
frequency alias.
•
Sample the data from different channels simultaneously to maintain
the phase relationship between channels, such as a tachometer signal
and a vibration signal.
Configuring DAQ Hardware Used with Examples
The example VIs that accept both prerecorded data and acquired data use
either an analog tachometer signal or a digital tachometer signal. The front
panel of the example VI specifies the type of tachometer signal the VI uses,
for example, Gabor Order Tracking (Analog Tach) or Gabor Order
Tracking (Digital Tach). Depending on whether the example is an analog
tachometer example or a digital tachometer example, when
Data Source
is
