(a)A machine runs on rolling element bearings at a shaft speed of 2200 rpm. The bearings have the following characteristics: roller/race diameter ratio = 0.23, number of rolling elements 11, contact angle 0. The machine is classified as Class III for the purpose of assessment under ISO 2372.

Assuming that the vibration can be described by a dominant frequency component of the form x(t) = A sin(2pft) calculate the vibration frequencies which would correspond to shaft and bearing faults occurring in this machine.

Using the ISO 2372 table, estimate the range of acceleration amplitudes which should be measureable in order to record the bearing's performance up to the 'unacceptable' threshold.

If an accelerometer of sensitivity 100 mV/g is used to detect the vibration of the bearing, estimate the maximum voltage amplitude which should be measureable.

ISO values - 0.18,0.28,0.44,0.70 Vrms in/s

Formulae -BPFO =

BPFI =

BSF =

FTF =