SÜS - Proceeding of Vibration Monitoring

Proceeding of Vibration Monitoring

The Vibration behavior is monitored automatically to a great extend during normal steady-state operation. The measured signals are electrically amplified, digitized and synchronously transformed to the frequency domain in a multi-channel signal processor.

The current resulting characteristic vibration functions and variables are compared with those of the reference status and are graphically represented in the form of a trend charts. If the deviations violate predefined attention thresholds, SÜS announces this in the control room and indicates the affected characteristic vibration variable and the affected component via a 3-D figure of the monitored object on the SÜS screen. The attention thresholds are based on empirical values, structure dynamics calculations and experimental analyses.

The characteristic vibration behavior of each component depends on its mechanical properties and can be described in terms of characteristic variables. These characteristic variables (e.g. frequency, magnitude) are determined using characteristic vibration functions (preferably auto power spectral densities). In the case of coupled components, each characteristic function contains the characteristic variables of several components.

When the vibration behavior of one component changes, the values of its dedicated characteristic variables change.

The assignment of characteristic variables to components is based on experiments and/or calculations as well as on commissioning measurements with additionally temporary installed vibration sensors.

Settings for the Performance of Vibration Monitoring

Settings for the performance of vibration monitoring by the SÜS are defined in the form of configuration templates:

• Monitored objects (object designation e.g. RCS or RCPs, monitored components, vibration types, signals and acquired operational parameters)
• Measurement templates (measurement in
  time-/frequency domain, channel settings,
  measurement with/without calibration...)
• Monitoring (characteristic functions, monitoring parameters, reference values, attention thresholds, monitoring cycles, alarm criteria)