Experimental Investigation of the Excitation Forcing Function in Rotating Machinery

Bearing fault is one of the major faults in the crystallographic failure of the rotating machine. Due to these faults induced in the rotating machine will lead to the excitation force i.e. the dynamic unbalance force is called excitation forcing functions. And the magnitude of these excitation forcing functions induced in the rolling element bearings varies based on many factors. And the factors are bearing faults, damage by belts, misalignments, leakages etc. The unbalance excitation forcing function due to the bearing faults has the major impact of the failure of rotating machinery. Vibration spectrum analysis for all these faults and particular to excitation forcing function can be studied extensively. In this paper, a new method of the experimental investigation of the excitation forcing function in the rolling element ball bearing is studied. And the excitation forcing function is formulated from the vibration spectrum obtained based on the frequency domain. And these are done with respect to two types of defeats in the ball bearing that is on the outer race and inner race defects in comparison with healthy bearings. And this experimental investigation will lead to the accurate assessment of the failure of rotating machinery; unbalance excitation force which leads to the failure of rolling bearing faults.