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Torsional Vibration Analysis Using Rotational Laser Vibrometers.

Steven Chatterton1, Ludovico Dassi1, Edoardo Gheller1

  • 1Department of Mechanical Engineering, Politecnico di Milano, Via La Masa 1, 20156 Milan, Italy.

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|March 28, 2024
PubMed
Summary

This study introduces a reliable method using two laser torsional vibrometers for measuring shaft vibrations. The technique enables accurate detection of torsional mode-shapes and natural frequencies in rotating machinery.

Keywords:
calibrationdynamic modelrotational laser vibrometertorsional vibration

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Area of Science:

  • Rotor dynamics and mechanical vibrations.
  • Non-invasive measurement techniques.
  • Finite element analysis in mechanical engineering.

Background:

  • Torsional vibration is a critical failure source in rotating machinery, difficult to measure non-invasively.
  • Traditional torsional vibrometers are invasive, complex, and impractical for field use.
  • Laser torsional vibrometers offer a reliable, non-invasive, and portable alternative.

Purpose of the Study:

  • To develop and validate a reliable procedure for measuring torsional vibrations using two laser vibrometers.
  • To establish a method for relative calibration of different laser vibrometer heads.
  • To compare experimental results with numerical simulations for validation.

Main Methods:

  • Utilized two laser heads with distinct measurement capabilities on an experimental test rig.
  • Performed relative calibration between the two laser vibrometers.
  • Compared experimental torsional vibration measurements with a 1D finite element model.

Main Results:

  • Successfully defined a reliable measuring procedure for detecting torsional mode-shapes and natural frequencies.
  • Detailed the relative calibration process, crucial for correlating signals from different machine sections.
  • Achieved good agreement between experimental measurements and numerical simulation results.

Conclusions:

  • The developed procedure effectively utilizes two laser torsional vibrometers for accurate torsional vibration analysis.
  • Relative calibration is essential for correlating measurements across different sections of a machine.
  • The findings support the use of laser torsional vibrometers for diagnosing issues in real-world rotating machinery.