summary:This transmitter is the first to be recommended by a fault diagnosis companyAn integrated system4-20mAOutput a measurement method with independent dual signal (envelope, velocity) output function.

The significance of monitoring envelope values is very important;

1： Acceleration envelope is a monitoring method that extracts high-frequency signals from equipment vibration signals and processes them separately. It is particularly sensitive to impact signals. The frequency distribution on the envelope spectrum can be used to determine the surface damage of gears and bearings, and the severity of the fault can be determined based on the magnitude of the amplitude. Envelope monitoring is a sensitive parameter for detecting early defects in bearings. Bearing failure begins at the fatigue stress concentration point below the raceway surface. At this time, acoustic emission sensors can be used to detect the elastic wave signal of bearing fatigue damage. When the damage develops to the raceway surface and produces fine cracks, the resulting impact signal can be detected using acceleration envelope technology. Traditional vibration velocity signals can only be detected when the surface defects of the raceway develop to a very serious level. Therefore, acceleration envelope monitoring is a widely used and effective early bearing defect signal processing technology in the field of bearing status.

2： For rolling bearing equipment, using envelope values to analyze operating conditions can more intuitively determine equipment faults, rather than vibration speed. Because many devices have vibration speeds within the normal range, but the envelope value may already be very high, indicating that the bearing has failed and needs to be dealt with immediately. If not handled, it may cause greater losses.

3： In other cases, the vibration speed may indeed exceed the standard alarm value or even the trip value, but if other reasons can be ruled out and the envelope value is within a reasonable range, the equipment still does not need to be stopped for maintenance.

Electric motors generally use rolling bearings, and faults occur as bearing defect frequencies in the envelope spectrum and edge frequency components containing shaft rotation frequency.

effect:

If spectrum analysis can predict equipment failures, then envelope monitoring can serve as a sign of failure. Predicting early equipment failures plays a very important role.

The schematic diagram of envelope value processing is as follows:

By envelope decoding, periodic high-frequency and small amplitude signals are extracted, which are the early stage signals of bearingsfaultPeriodic wear and tear,Envelope processing can also be used to detect motorschangestripFault,rotorFriction,bearingPoor lubricationclassCaused by reasonsAmplitude modulation signal is used to extract characteristic signals of motor rotor bar faults, rotor friction, and poor bearing lubrication through envelope demodulation.