BRUEL & KJAER VIBROCONTROL 8000 - 24.1.6 Velocity; 24.2 Aero Derivative; 24.2.1 Aero-Derivative Accel; 24.2.2 Aero-Derivative Velocity Tracking

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24.1.6 Velocity
Typical uses: Velocity measurements as measured from piezo-electric, or moving coil velocity
transducers.
Measurement Description Default or Add
Direct
Overall dynamic amplitude measurement.
24 dB/octave (4 pole) roll-on, -24 dB/octave (4 pole) roll-off.
Default
Bias
The sensor bias voltage for diagnostics.
Default
1X amplitude
and phase
The velocity component occurring at the rotor speed.
Default
Requires PT
2X amplitude
and phase
The velocity component occurring at twice the rotor speed.
Default
Requires PT
Band-pass
A band-pass filtered and amplitude detected measurement.
May be used in conjunction with Direct to measure a
different frequency region, integration, or units.
Add (if needed)
nX amplitude
and phase
The velocity component occurring at “n” times the rotor
speed.
Add (if needed)
Requires PT
24.2 Aero Derivative
24.2.1 Aero-Derivative Accel
Typical uses: Aero-Derivative Gas Turbines with high temperature accelerometers
Measurement Description Default or Add
Aero 1X
Tracking Filter
(primary)
Signal is band-pass filtered with -48dB (8 pole) roll-on/roll-off
and then filtered around the 1X speed frequency.
Integrated to velocity (configurable).
Default
Requires PT
Band-pass 1
Typically used for wideband velocity measurements. Band-
pass filtered measurement.
-48 dB/octave roll-on, roll-off. Integrated to velocity
(configurable)
Default
Band-pass 2
Typically used for wideband acceleration measurements.
Band-pass filtered acceleration -48 dB/octave roll-on, roll-off.
Default
Bias
DC sensor bias for diagnostics.
Default
24.2.2 Aero-Derivative Velocity Tracking
Typical uses: Aero-Derivative Gas Turbines with Aero Interface Modules using Tracking Filters.
Measurement Description Default or Add
1X Tracking Filter
Filtered around the 1X speed frequency.
Default
Requires PT
Band-pass
Band-pass filtered dynamic amplitude measurement. -48
dB/octave (8 pole) roll-on, roll-off. May be used for a
wideband velocity measurement.
Default
Bias
DC sensor bias for diagnostics.
Default