1. Three vibration data sets have been posted on the course website, which were
collected by using the following experimental setup. The tested bearings have three
health conditions: healthy, faulty with an outer race defect, and faulty with an inner
race defect. The testing conditions are: shaft rotating speed is 1200 rpm, and the
sampling frequency is 32,700 Hz (selected by the monitoring system). NC: normal
(healthy condition); OR: out race damage; IR: inner race damage.
(a) Compute the theoretical characteristic frequencies on the amplitude spectra,
corresponding to these three bearing health conditions.
(b) Do fault diagnosis for these three bearings.
Motor
Testec
bearing
Gearbox
Ch #1
Ch #2
Ch #3
(1) Drive motor: 3 HP.
(2) Tested bearing parameters: deep-groove ball bearing,
d = 7.937mm, D = 33.503mm, a = 0, Z = 8