UEB Series Ultrasound Sensor Functional Trials
This trial was performed by our valued partner, Jake Ford, at PFE Limited
Introduction
The purpose of the UEB332 Ultrasound Sensor trial was to assess its benefits, such as increased high frequency data between a standard accelerometer and CTC's UEB332 100 mV/g Ultrasound Sensor.
Trial Setup
The PFE Limited trials rig was set up on a low speed using the VFD, at a frequency of 1 Hz, giving and approximate shaft speed of 59 RPM.
Trial Conditions
‣ The mounting style and location for both sensor types are identical
‣ Programming is identical
‣ Collection device is identical
The Sensors
PFE Limited tested two CTC sensors for this trial:
Typical frequency response:
‣ 100 mV/g sensitivity
‣ Perfect for thousands of applications
‣ Affordably priced, hermetically sealed sensor
‣ Standard 2 pin MIL connection or integral cable option (note: integral cable options are only for using in permanent monitoring applications)
2. UEB Series Mini Size Ultrasound Sensor
Typical frequency response:
‣ 100 mV/g sensitivity
‣ High frequency ultrasound accelerometer
‣ High amplitude resonance peak for Stress Wave Management Techniques
‣ 2 pin Mini-MIL connection or integral cable (note: integral cable options are only for permanent monitoring applications)
Trial Rig Modification
A defect was put into the non-drive-end bearing of the test rig motor for producing 'stress waves.'
________________________________________________________________________________
Trial 1 - Waveform
‣ 10 Hz high pass filter
‣ 102.4 kHz sampling frequency (significance: 2.56 x 44 kHz - UEB resonance frequency)
‣ 512,000 samples
AC102 Standard Accelerometer:
‣ Low level modulation
‣ ~0.085 g's pk (+)
~0.078 g's pk (-)
‣ ~0.157 g's pk-pk
UEB332 Ultrasound Accelerometer:
‣ Much clearer modulation
‣ ~0.25 g's pk (+)
~0.23 g's pk (-)
‣ ~0.457 g's pk-pk
Overlay of AC102 & UEB332 Trial 1 Results:
________________________________________________________________________________
Trial 2 - HF Spectrum
‣ 10 Hz high pass filter
‣ 80 kHz Fmax
‣ 102,400 lines (a little overkill)
AC102 Standard Accelerometer (logarithmic y axis):
‣ Some harmonic content up to just under 40 kHz
‣ Low amplitude (due to the speed)
UEB332 Ultrasound Accelerometer (logarithmic y axis):
‣ Some harmonic content exceeding 40 kHz up to ~65 kHz
‣ Low amplitude (due to the speed)
Overlay of AC102 & UEB332 Trial 2 Results (logarithmic y axis):
_______________________________________________________________________________
Trial 3 - Enveloping
‣ 10 Hz high pass filter
‣ 80 kHz fmax
‣ 6,400 lines
‣ Band pass width 20 kHz
‣ Center frequency 44 kHz
AC102 Standard Accelerometer (logarithmic y axis):
‣ Some harmonic content up to ~4 kHz enveloped frequency
‣ No clear sidebands
UEB332 Ultrasound Accelerometer (logarithmic y axis):
‣ Some harmonic content throughout the enveloping range
‣ Clear sidebands in the midrange
Overlay of AC102 & UEB332 Trial 3 Results (logarithmic y axis):
________________________________________________________________________________
Conclusion
The UEB332 produced a more clear shape in the waveform, and a more harmonic presence in the very high-frequency range of the spectrum/enveloping.
A very high sample rate was not available to all collectors that were used, and this was a singular trial; further trials are required, but the results show well thus far.
