Shock pulse method

Shock pulse method (SPM) is a technique for using signals from rotating rolling bearings as the basis for efficient condition monitoring of machines.

From the innovation of the method in 1969 it has been further developed and broadened and is a worldwide accepted philosophy for condition monitoring of rolling bearings and machine maintenance.

The first frame shows the symbol for a transducer and, below, the vibration signal from the machine, with superimposed transients at the resonance frequency, caused by shock pulses.

When the oil film in the bearing is thick, the shock pulse level is low, without distinctive peaks.

Shock values are thus immediately translated into measurements of relative oil film thickness or surface damage, whichever applies.