High-Definition Vibration Enveloping
Gary Parr | February 18, 2016
HD Enveloping is a high-definition vibration enveloping technique for detection of early-stage gear and bearing faults. A complement to traditional vibration analysis, the method detects, at a very early stage, machine problems that are generally difficult to find in good time with conventional non-enveloping techniques. Significantly extending the planning horizon for predictive maintenance, the method is said to be a boost to maintenance efficiency. The technique can be used with existing vibration transducer installations and integrates into existing industrial infrastructures while monitoring applications in the 15,000 to 20,000 rpm range.
The unit of measurement is HD Real Peak, a scalar value expressed in decibels. Representing the true amplitude levels found in the envelope signal, HD Real Peak is the primary value to use for determining the severity of a given damage. It is also used for triggering alarms. Using order tracking and symptom enhancement, applying FFT on the signal is very useful to determine the source of the signal. Spectrums and time signals provide a snapshot of machine condition to give the maintenance department a heads-up on potential problems. Straightforward setup uses a set of predefined filters, each designed to detect damages or anomalies in different stages of development.