IRD Mechanalysis have developed “Spike Energy” to detect rolling element bearing condition in its very early stage. “Spike Energy” detects low amplitude transient impacts generated within the ultrasonic frequency range by microscopic surface flaws in rolling element bearings and gears.
As the vibrations are at very high frequencies, circuit utilizes an acceleration signal and a high pass filter to filter out low frequencies. A true Peak-to-Peak value detecting circuit is incorporated as these signals have low RMS values. The acceleration signal processed via a high pass filter and a peak detection circuit produces a numerical value which is the product of the number and amplitude (intensity) of the impacts in a unit of time. This is Spike Energy.
There are four failure stages in a bearing: