National Instruments Order Analysis Toolset - Manual (Page 41)

© National Instruments Corporation 4-1 LabVIEW Order Analysis Toolset User Manual
4
Resampling-Based Order
Analysis
This chapter describes the resampling method provided by the LabVIEW
Order Analysis Toolset, determining the time instance for resampling,
resampling vibration data, and slow roll compensation.
LabVIEW Order Analysis Toolset Resampling Method
With software resampling, the LabVIEW Order Analysis Toolset enables
you to complete the following tasks:
• Resample even time-space samples to even angle-spaced samples
• Obtain magnitude and phase information for each order
Figure 4-1 illustrates the resampling-based order analysis process provided
by the LabVIEW Order Analysis Toolset.
Figure 4-1. Resampling-Based Order Analysis Diagram
Tachometer
Signal
Step 1:
Data
Acquisition
Vibration
Signal
Step 2:
Determine the
Time Instant
for Resampling
Step 3:
Resample the
Vibration Data
Step 4(a):
Compute
Order
Spectrum
Resampled
Signal
Step 4(b):
Track Magnitude
and Phase of
Individual Orders
Magnitude
and Phase
Step 5:
Slow Roll
Compensation
Time
Instant