Rotating machine diagnostic system by wide frequency methods of FOD
Damage of rotating machine comes from bearing, shaft, etc that are represented from high frequency ultrasonic to low frequency vibration. By using FOD wide coverage of frequency (10Hz to 1MHz), preventive diagnosis is possible.
Abnormality of rotating machine is defined as
1) Structure-related : unbalance, miss-alignment, shaft bend >> Low frequency signal below 1kHz
2) Impact-related : bearing damage >> High frequency signal above 1kHz
FOD system can monitor such low and high frequency signal simultaneously due to its wide range coverage, i.e. AE and vibration.
FOD sensor permanently installed, while by connecting it to optical analyzer at regular maintenance cycle and obtaining AE and vibration data and analyze.