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Operational Deflection Shape Measurements on Bladed Disks with Continuous Scanning Laser Doppler Vibrometry.

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  • 1School of Aeronautic Engineering, Nanjing Vocational University of Industry Technology, Nanjing 210023, China.

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|June 19, 2024
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Summary

This study extends continuous scanning laser Doppler vibrometry (CSLDV) to measure non-continuous bladed disk vibrations. The new method accurately captures operational deflection shapes (ODSs) and relative blade phases for complete vibration analysis.

Keywords:
ODS FRFbladed disklaser Doppler vibrometryphase identification

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Area of Science:

  • Mechanical Engineering
  • Vibration Analysis
  • Structural Dynamics

Background:

  • Continuous scanning laser Doppler vibrometry (CSLDV) is standard for analyzing vibration operational deflection shapes (ODSs) of continuous surfaces.
  • Measuring ODSs of non-continuous structures like bladed disks presents challenges due to difficulties in determining relative vibration phases between components.

Purpose of the Study:

  • To extend CSLDV for efficient measurement of non-continuous bladed disk ODSs.
  • To enable reconstruction of the complete vibration mode of bladed disk systems.

Main Methods:

  • An extended CSLDV technique was developed for bladed disk analysis.
  • A method based on ODS frequency response functions (ODS FRFs) was employed.
  • A reference signal from a fixed point was used to determine inter-blade vibration phase relationships.

Main Results:

  • The extended CSLDV successfully measured ODSs on a non-continuous bladed disk.
  • The method allowed for the determination of relative vibration phases between blades.
  • Experimental validation confirmed the feasibility and effectiveness of the proposed technique.

Conclusions:

  • The extended CSLDV method provides an efficient way to obtain complete ODSs for bladed disks.
  • This technique overcomes limitations of standard CSLDV for non-continuous structures.
  • The findings are crucial for accurate vibration analysis and modal identification of bladed disk assemblies.