Implementing Order Analysis in LabVIEW

1 Introduction 

Order analysis is a powerful tool for studying, designing, and verifying rotating or reciprocating systems with time-varying angular velocity. Similar to frequency domain analysis, you can think of order analysis as a signal scalpel that dissects sound, vibration, and other dynamic signals into components related to the physical quantities of the mechanical system. This gives you a better understanding of the system and the ability to identify characteristics that vary with time and operating conditions. Unlike power spectrum or other frequency domain analysis standards, order analysis works even when the signal source is subject to angular velocity variations or frequency/Doppler shifts. The Order Analysis

VIs included in the Sound and Vibration Measurement Suite provide the ability to calculate, analyze angular velocity, and extract order components from raw noise and vibration signals. Power distribution can be measured as a function of time or angular velocity, while the phase and amplitude of any order component can be measured as a function of angular velocity. Data can be displayed in the form of waterfall plots, trajectory plots, polar plots, and Bode plots.
 

In addition to the advanced VIs that provide flexibility and enhanced analysis process control, the kit also includes a set of express VIs that allow you to perform simple tasks without much programming. Along with the toolkit are a large number of examples that demonstrate basic order analysis tasks, such as data acquisition, data display, Gabor order tracking, and resampled order tracking for analog and digital tachometer signal processing. With the help of these examples, you can develop application software more quickly.

You can apply order analysis to dynamic signals generated by mechanical systems that contain rotating and reciprocating parts. Order analysis is commonly used in machinery condition monitoring (MCM) and noise, vibration, and harshness (NVH) monitoring. With additional online processing capabilities, you can easily create flexible applications based on condition monitoring and predictive maintenance. NI's NI dynamic signal acquisition devices use 24-bit analog/digital converters and anti-aliasing filters, making them ideal for acquiring sound and vibration signals.

2. Quick VIs for Order Analysis

The Sound and Vibration Measurement Suite provides quick, easy-to-learn, and easy-to-use VIs for the most common applications, including:

• Analog speed signal processing
• Order Power Spectrum Analysis
• Spectral analysis of waterfall and color plots
• Order Tracking - Magnitude and Phase
• Order waveform extraction

Shown below is an example of an order tracking application with simultaneous magnitude and phase tracking of 4 orders (1x, 2x, 3x and 10x).

3. Order analysis functions and description tables

• Speed ​​processing
• Order Power Spectrum
• Order Tracking
• Order Extraction
• Angle Resampling
• Waterfall Chart
• Track and axle axis diagram
• Polar and Bode plots
• Envelope Detection