OneProd MVX User Manual page 11

Illustration:
 "Standard" indicators are achieved at each cycle by MVX.
Thus, a very short phenomenon can be ignored if it happens during a processing
phase.
Acquisition Processing

RT indicators (Real Time) are achieved permanently during acquisition
Thus, 100% of the signal is actually monitored.
Acq. 1
Acq. 2
Proc. 1
Thus the smallest transient phenomena can be detected (even if it happens only
once and if it lasts some milliseconds), according adapted parameters (i.e. pick
detection).
Besides it is obVIOusly possible to choose another set of parameters, which erases
transient phenomena in order to avoid false alerts (i.e. RMS detection with several
seconds time constant).
As a complement to such real time monitoring, MVX can record a new "Time waves
on event" signal category (Please see next §).
The following processing parameters can be applied to define real time indicators
which are monitored on 100% of the signals.

High pass filter : 2Hz or 10Hz

Signal integration : 0 or 1

Low pass filter : 1000Hz or no filter (i.e.20kHz)

Processing : RMS, pk or pk-pk

Averaging : continuous exponential with time constant between 1s and 25s

Averaged DC level (for process and GAP signals)

BGI indicator (Blade Guard Index)

GCI indicator (Gearbox Condition Index, see next §)

Broad band and narrow band extraction on real time FFT :
o
FFT 400 pts, 800 pts, 1600 pts ou 3200 pts
o
FFT 1kHz, 2kHz, 5kHz, 10kHz ou 20kHz,
o
FFT with 50% fixed overlapping
11
Acquisition Processing
1 cycle
Acq. 3 Acq. 4
Proc. 2 Proc. 3
Acquisition Processing
Acq. 5 Acq. 6
Proc. 5
Proc. 4
t
t
Proc. 6
Brand of ACOEM