Abstract
In this paper an innovative method for the operating vibration measurement is shown, based on Laser Doppler Vibrometry exploited in the continuous scanning fashion. That method consists on the re-sampling of the LDV output signal so that the spatial information carried by the scanning laser beam all over the vibrating structure can be recovered with an arbitrary spatial resolution.
The proposed method allows to choose the laser spot trajectory better representing the deformation shape of the object surface during motion, for instance the triangular shape typical of micro eolic generators. In addition, the proposed approach solves the problems connected to aliasing effects due to reduced scan frequency of the scanning mirror in such a way that the parameter selection is blind and automatic.
This is a preview of subscription content, log in via an institution.
Buying options
Tax calculation will be finalised at checkout
Purchases are for personal use only
Learn about institutional subscriptionsReferences
Stanbridge AB, Martarelli M, Ewins DJ (1999) Scanning laser Doppler vibrometer applied to impact modal testing, Kissimmee. In: 17th international modal Analysis conference—IMAC XVII, vol 1. SEM, Bethel, pp 986–991
Stanbridge AB, Martarelli M, Ewins DJ (2001) Rotating disc vibration analysis with a circular-scanning LDV. In: Proceedings of the IMAC XIX, Kissimmee
Martarelli M, Ewins DJ (2006) Continuous scanning laser Doppler vibrometry and speckle noise occurrence. Mech Syst Signal Process 20(8):2277–2289, ISSN 0888–3270
Di Maio D, Ewins DJ (2010) Applications of continuous tracking SLDV measurement methods to axially symmetric rotating structures using different excitation methods. Mech Syst Signal Process 24:3013–3036
Castellini P, Paone N (2000) Development of the tracking laser vibrometer: performance and uncertainty analysis. Rev Sci Instrum 71(12):4639–4647
Martarelli M, Castellini P, Santolini C, Tomasini EP (2011) Laser Doppler vibrometry on rotating structures in coast-down: resonance frequencies and operational deflection shape characterization. Meas Sci Technol (in press) corrected proof
Gasparoni A, Allen MS, Yang S, Sracic MW, Castellini P, Tomasini EP (2010) Experimental modal analysis on a rotating fan using tracking-CSLDV. In: 9th international conference on vibration measurements by laser and noncontact techniques & short course, Ancona, 22–25 June 2010
Castellini P, Paone N (2000) Development of the tracking laser vibrometer: performance and uncertainty analysis. Rev Sci Instrum 71(12):4639–4647
Blewins RD (1984) Formulas for natural frequency and mode shape. R.E. Krieger publishing, Malabar, McConnel KG (1995) Vibration testing, theory and practice. Wiley
Acknowledgements
The activity is partially funded by National Ministry of University with the project PRIN 2008 “Diagnostics methodologies for wind power systems”, prot.2008AFZKX5. Authors would like to acknowledge Dr. Claudio Santolini and Dr. Paolo Chiariotti for the precious discussions.
Author information
Authors and Affiliations
Corresponding author
Editor information
Editors and Affiliations
Rights and permissions
Copyright information
© 2012 The Society for Experimental Mechanics, Inc.
About this paper
Cite this paper
Castellini, P., Sopranzetti, F., Martarelli, M., Tomasini, E.P. (2012). Continuous Scanning LDV by Signal Re-sampling Method: A New Signal Processing Approach. In: Allemang, R., De Clerck, J., Niezrecki, C., Blough, J. (eds) Topics in Modal Analysis II, Volume 6. Conference Proceedings of the Society for Experimental Mechanics Series. Springer, New York, NY. https://doi.org/10.1007/978-1-4614-2419-2_45
Download citation
DOI: https://doi.org/10.1007/978-1-4614-2419-2_45
Publisher Name: Springer, New York, NY
Print ISBN: 978-1-4614-2418-5
Online ISBN: 978-1-4614-2419-2
eBook Packages: EngineeringEngineering (R0)