General informations

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1 - Applications

Blade Tip Clearance Measurement in base load
Blade Tip Clearance Measurement in rotor barring
Blade Vibration Measurement
Shaft orbiting at blade row
Static displacement measurement (e.g. shaft, disk...)
Other Vibration measurement (e.g. shaft, disk...)
Blade Health Monitoring

2 - Measurement output of particular interest

Real-time displays and functions
Real-time measurement display

• Blade TipClearance:
  Min, Avg, Max clearances
  All blade clearance

• BladeTip-Timing (blade vibration):
  Absolute deflection envelop
  All blade deflection
  Single blade frequency content (Spectrogram)

• Shaft orbiting at measurement plane:
  X-Y plot
  X(t), Y(t)

Real-time display of a quantity that id currently not available in the software

Specific blade tip clearance display (describe)
Specific blade tip-timing display (describe)

Alarms of absolute quantities (clearance and deflection)

Post-analysis functions
Post analysis of tip clearance history
Post analysis of absolute deflection history
Post analysis of synchronous resonance amplitudes and frequencies

(Section 3 to 6 to be filled in for each measurement planes)

3 - Sensors

Number of sensors:
3-4 (BTC)
3-12 (BTT)

Clearance range:
Min
Max
Accuracy range (if possible)

Sensor assembly set back:
Recess distance
Casing material

Sensor Size restrictions:
Diameter
Length

Sensor fitting:
Axial cable link
Radial cable link

Operating temperature:
Sensor tip
Sensor body
Sensor back

Distance between sensor and conditioning electronic:
Mineral cable length (T > 200°C; 392°F)
Flexible Teflon cable length (T < 200°C) to electronics rack

Shrink junction between mineral cable and Teflon cable

Dielectric nature (gas composition, phase)

4 - Type of Target

Free standing blade

Blade Tip Thickness at measurement plane
Blade axial chord

Blade tip shape (ideally provide blade tip geometry on drawings or CAD files):
Flat tip (per se compressor)
Squealer tip (per se turbine)
Other tip

Blade pitch at tip

Blade passing frequency:
Min RPM
Max RPM
Blade count

Shrouded blade

Blade shroud geometry (ideally provide blade shroud geometry on drawings or CAD files)

Continuous (e.g. a shaft)

Shaft material
Surface roughness

5 - Calibration (clearance only)

Pseudo dynamic calibration by Fogale with Fogale automated calibration bench (blade tip geometry to be supplied in CAD file to Fogale)
Automated calibration bench to be supplied to customer

6 - Blade tip-timing optimization

Sensor positioning optimization to be performed by Fogale (customer provide Fogale with Campbell diagram with critical speeds, EO, modes and mode shapes from FEM)

7 - Other requirements or issues

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