Machine Vibration Analysis
Vibrations in machines can cause equipment failure, down-time in production, and poor manufacturing of materials. These failures cost industry billions of dollars every year. Discovering causes and sources of these vibrations can save money and lead to increased productivity.
Views 3-D surface, Spectrum
Sampling rate 11050 Hz
FFT size depends on test length (15 min. test use 32k)
FFT overlap percentage As detailed below.
Decimation 15 for low frequency vibration < 60 Hz
Smoothing window Hanning
Averaging size 20
Amplitude Scaling Logarithmic
Frequency Scaling Linear
Sampling Precision 16 bit mono
Start the Recording
Slowly ramp-up machinery to full speed. Then let machines run for a few minutes at full speed and ramp-down until stopped.
Stop the Recording
Change to the Post-Processing mode.
Initially set the Overlap Percentage to 50%.
Click the rewind button to position the current file position to the start of the file.
Run the analyzer until the 3-D display is filled or the end of file position is reached.
You should easily see the ramp-up and ramp-down. Look for resonances and beat frequencies these are often the cuase of damage.
Use the left mouse button to readout the time corresponding to the start of the resonances or beats.
If the machine produces a product, inspect the product that corresponds to the times of the resonances and beats for defects.
The same procedure applies when using the spectrogram in place of the 3-D surface plot.