A laser Doppler vibrometer measures the translational velocity at a point along the direction of incident light. It has been shown that rotational velocities can also be recovered when the laser scans continuously along a short line or small circular path around that point. This work uses the harmonic transfer function to relate the measured translational and rotational velocities to the input force. With this concept, the continuous-scan approach can be combined with the conventional point-by-point scheme, acquiring three dimensional velocities under various types of excitation conditions in the same amount of time that is required for obtaining only the translational velocity. The proposed approach is validated on a downhill ski under free-free boundary conditions with a circular scan pattern. The influence of the circle size, the scan rate and the surface quality on the noise level is evaluated. It is found that the circular-scan approach provides smoother and more reliable mode shapes than the conventional point-by-point approach given appropriate parameters. Local slopes at the measurement locations are then computed from the identified rotational velocities, providing additional information for model validation and damage detection.
Skip Nav Destination
Article navigation
April 2014
Research-Article
Harmonic Transfer Function to Measure Translational and Rotational Velocities With Continuous-Scan Laser Doppler Vibrometry
Shifei Yang,
Shifei Yang
Graduate Research Assistant
Department of Engineering Physics,
e-mail: syang66@wisc.edu
Department of Engineering Physics,
University of Wisconsin-Madison
,535 Engineering Research Building
,1500 Engineering Drive
,Madison, WI 53706
e-mail: syang66@wisc.edu
Search for other works by this author on:
Matthew S. Allen
Matthew S. Allen
Assistant Professor
Department of Engineering Physics,
e-mail: msallen@engr.wisc.edu
Department of Engineering Physics,
University of Wisconsin-Madison
,535 Engineering Research Building
,1500 Engineering Drive
,Madison, WI 53706
e-mail: msallen@engr.wisc.edu
Search for other works by this author on:
Shifei Yang
Graduate Research Assistant
Department of Engineering Physics,
e-mail: syang66@wisc.edu
Department of Engineering Physics,
University of Wisconsin-Madison
,535 Engineering Research Building
,1500 Engineering Drive
,Madison, WI 53706
e-mail: syang66@wisc.edu
Matthew S. Allen
Assistant Professor
Department of Engineering Physics,
e-mail: msallen@engr.wisc.edu
Department of Engineering Physics,
University of Wisconsin-Madison
,535 Engineering Research Building
,1500 Engineering Drive
,Madison, WI 53706
e-mail: msallen@engr.wisc.edu
Contributed by the Design Engineering Division of ASME for publication in the JOURNAL OF VIBRATION AND ACOUSTICS. Manuscript received September 4, 2013; final manuscript received December 9, 2013; published online February 5, 2014. Assoc. Editor: Jeffrey F. Rhoads.
J. Vib. Acoust. Apr 2014, 136(2): 021025 (11 pages)
Published Online: February 5, 2014
Article history
Received:
September 4, 2013
Revision Received:
December 9, 2013
Citation
Yang, S., and Allen, M. S. (February 5, 2014). "Harmonic Transfer Function to Measure Translational and Rotational Velocities With Continuous-Scan Laser Doppler Vibrometry." ASME. J. Vib. Acoust. April 2014; 136(2): 021025. https://doi.org/10.1115/1.4026350
Download citation file:
Get Email Alerts
Boundary-Element Analysis of the Noise Scattering for Urban Aerial Mobility Vehicles: Solver Development and Assessment
J. Vib. Acoust (October 2024)
Related Articles
Active Resonators for Noise Absorption
J. Vib. Acoust (February,2006)
An Instrumental Variable Method for Continuous-Time Transfer Function Model Identification With Application to Controller Auto-Tuning
J. Dyn. Sys., Meas., Control (March,2007)
Long Short-Term Memory Autoencoder for Anomaly Detection in Rails Using Laser Doppler Vibrometer Measurements
ASME J Nondestructive Evaluation (August,2025)
Related Proceedings Papers
Related Chapters
FKT Based Linear Precoding for Multiuser Multiple Input Multuple Output System
International Conference on Computer Engineering and Technology, 3rd (ICCET 2011)
The Simulation of Lunar Exploration and Image Transmission
International Conference on Advanced Computer Theory and Engineering (ICACTE 2009)
Mash 2-1 Multi-Bit Sigma-Delta Modulator for WLAN
International Conference on Future Computer and Communication, 3rd (ICFCC 2011)