Before You Begin (Sound and Vibration Measurement Suite)
December 2007
NI Part Number:
372416A-01
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In this tutorial, you use the Order Analysis Express Measurements Express VIs and example VIs to analyze a device under test (DUT).
Understanding the Device under Test
An effective order analysis application requires a thorough knowledge of the DUT. The more information you have about the DUT, the more useful the analysis you perform can be in understanding the behavior of the system.
The DUT for the exercises in this tutorial is a computer fan with four coils and seven blades. The example data you use represents a 15-second run-up test of the computer fan. Run-up and run-down tests are useful for identifying orders that generate significant amplitude only when the DUT approaches or surpasses the critical speed, or resonant frequency.
Using the Example VIs
The Order Analysis Express Measurements Express VIs provide common analysis methods you can use to acquire information about the orders in a sound or vibration signal. You can use these Express VIs to analyze the computer fan run-up data.
Use the Getting Started Exercise (Empty) VI, located in the labview\examples\Order Analysis\Getting Started Tutorials directory, as a template for the following exercises to build an order analysis application with the Order Analysis Express Measurements Express VIs.
Refer to the Getting Started with Order Analysis Express VIs example VI, located in the labview\examples\Order Analysis\Getting Started Examples directory, for an example of the completed application.
When you complete the exercises in this tutorial, the block diagram of the Getting Started Exercise (Empty) example VI should appear similar to the block diagram of the Getting Started with Order Analysis Express VIs example VI, as shown in the following figure.
The Getting Started with Order Analysis Express VIs example VI uses the colormap, order power spectrum, magnitude, and order waveform plots to analyze the sound and vibration data from the computer fan. Each plot displays the same information from a different perspective. You can use these plots to analyze the example data and gain a fuller understanding of the DUT.
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