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Problem with the amplitude of shaft frequency

From: D.A.
Remote Name: 132.246.33.165

Comments

We are trying to detect the defect frequency on a defective roller bearing using a lab test rig. The shaft frequency is 20 Hz. An accelerometer was mounted on the top of the bearing's housing. When looking at the spectrum, the defect is easily detectable by its frequency, but the problem is that the shaft frequency has the highest amplitude of all the frequencies (4.82 gs rms), which represents about 3 mm rms displasment amplitude !! This is a big value and the shaft isn't vibrating with such an amplitude. the accelerometer was verified with a shacker and gave an accurate results. Can anybody help me to understand that ?

Last changed: October 16, 2007