Getting Started with Order Analysis
PrintOverview
This VI demonstrates an overview of National Instruments order analysis features. This VI includes the following functions:
1. Waveform and Speed Profile
2. Colormap
3. Order Spectrum
4. Order Magnitude and Phase
5. Waterfall Plot
6. Cascade Plot
7. Orbit Plot
8. Timebase Plot
9. Polar Plot
10. Shaft Centerline Plot
Order analysis is a technique for measuring and analyzing sound and vibration signals generated by rotating or reciprocating machinery, such as engines, compressors, turbines, and pumps. These machines have a variety of parts, and each part contributes a unique sound and vibration pattern to the sound and vibration pattern of the whole machine. With order analysis, you can identify and isolate these sound and vibration patterns to analyze the performance and quality of each machine part individually. The information you gather with order analysis often is difficult to acquire with traditional sound and vibration analysis methods.
Traditional sound and vibration analysis methods such as Fast Fourier Transform (FFT) analysis cannot detect mechanical characteristics that change with speed. Order analysis, on the other hand, enables you to identify data at various orders, or harmonics of the rotational speed. The first order refers to the speed at which the machine rotates. Each order thereafter is a corresponding multiple of the rotational speed. The second order is twice the rotational speed and the third order is three times the rotational speed and so on. Using order analysis, you therefore can analyze signal variations due to changes in speed.
This program is a shipping example VI included with the NI Sound and Vibration Measurement Suite.
This software is written in LabVIEW, a graphical programming language designed for scientists and engineers. For more information about LabVIEW, visit ni.com/labview.
Sound and Vibration Developers Library
The NI Sound and Vibration Developers Library is your one-stop online resource for learning about and downloading code for acoustic analysis, machine diagnostics and audio test functions. On this page, you will find links to detailed tutorials, application notes, example programs, and analysis function descriptions.
More information on National Instruments signal processing can be found at the Signal Processing Resource Center.
Downloads
Filename: gs_orderanalysis.vi
Requirements: View
This is a picture of the VI's front panel. To view the block diagram and additional documentation, download the attached file.
Related Links
Requirements
Filename: gs_orderanalysis.vi
Software Requirements
Application Software: LabVIEW Full Development System 8.2
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