Noise subtraction and marginal enhanced square envelope spectrum (MESES) for the identification of bearing defects in centrifugal and axial pump

The natural intermittent impulses created by impeller in case of centrifugal pump, and reciprocating motions of piston in case of axial pump exhibit strong cyclo-stationary phenomenon. This makes the identification of defect impulses difficult in their vibration signals even with the powerful signal processing techniques such as Fast-spectral correlation. To deal with the issue, this work proposes noise subtraction and marginal enhanced square...