Acquire Blade Data software is used to capture non-contacting blade tip timing sensor data. Some features include:
  • The software communicates with Hood Technology’s BVSI 5.x, integrated in BVM model 8030 and BVM model 4016C, allowing the user to view and change conditioning and triggering parameters for each sensor (gain, lowpass, highpass, arm, trigger, etc.).
  • The Virtual Oscilloscope allows the user to view analog sensor signals and time of arrival while simultaneously adjusting conditioning and triggering.
  • The time of arrival and the encoded blade pulse amplitude can be continuously streamed to disk (up to 1.5Mpulses/sec ~=6MB/sec for BVM8030 and 0.25Mpulses/sec ~=1MB/sec for BVM4016C).
  • Up to 30 channels are supported (30 for BVM8030, 16 channels for BVM4016C). 
  • Multiple rotors are supported.
  • Real-time displays include:
    • RPM
    • Sensor Status (correct number of pulses, arrival variability).
    • Generalized synchronous and non-synchronous amplitudes, including blade-by-blade and historical data.
    • Circumferential Fourier fit (multi-sensor order tracking) with assumed response order.
    • Synchronous Campbell diagram based on order scheduling.
    • Blade-tip clearance from blade-pulse amplitudes or Skewed Dual Light Probes (SDLP), including blade-by-blade and historical data.
    • Blade Stagger when two chordwise positions are available.
    • All-blades FFT for non-synchronous events (flutter, rotating stall, etc.)
    • Single blade non-synchronous amplitudes using scheduled nodal diameters.
    • Interblade spacing as a potential indication of rotor cracks.
  • Test monitoring and data management features include:
    • Select manual data acquisition and RPM-dependent acquisition.
    • Circular buffer streams all data, so that data can be recovered if tagged (to be saved) by other events (e.g. high non-synchronous vibration, pretrigger).
    • Automatic folder creation for long term testing.
    • Data can periodically saved for long-term tests (months and years).
    • Creates an ASCII information file (*.inf) containing all pertinent information.
    • Notes are automatically appended to *.inf.
    • Supports the use of visual and audible alarms for excessive synchronous and non-synchronous vibration, tip clearance, and blade stagger angle.

Figure 1:  Multiple screen captures from Acquire Blade Data software.