The diagnostic techniques used on the platform are based for standardization and interoperability purposes on international standards and open good practices. That is exactly what most of the diagnostic maintenance community uses. Their combination may cover all your needs.
We use multiple monitoring indicators on each equipment to assess the health of the equipment targeting specific symptoms. Specifically, can be configured for each indicator:
- Order of integration (no integration, simple integration, double integrations).
- Value calculation method (RMS, Crest factor, Pk-Pk, True Peak, FFT bin)
- High-pass and low-pass filter
- Averaging overlap
- Range of harmonics if FFT bin was selected as the value calculation method
Each monitoring indicator can have one or more alarm scenarios. Each scenario is based on the following elements:
- Upper / lower limit of major risk
- Upper / lower limit of moderate risk
If an indicator has more than one scenario, they can vary by load. This can be a measurable or non-measurable operating characteristic such as speed, pressure, current etc. When a measurement exceeds the limits of one or more monitoring indicators, the measurement is defined as a measurement with “High risk” or “Moderate risk” status.
The selection of alarms is not always obvious for all equipment. That is why MECHBASE has a tool for statistical alarms. Assuming that the equipment is in good general condition we take measurements for several days. Then we use the tool which automatically calculates the statistical standard deviation of the measurements (σ) and suggests alarms at 2σ for the “Moderate risk” limit and 3σ for the “Major risk” limit.