This paper demonstrates a new method of conducting a noncontacting vibration measurement on light structures. Although laser vibrometry provides a routine method of acquiring response data, the method of achieving noncontacting point excitation of structures remains problematic. This is the primary concern of the paper. There is understandable motivation to develop a viable noncontacting excitation method as exciting methods involve contact thereby altering the structure’s in-situ properties. The method demonstrated in the paper explores the use of focused acoustic excitation. An ellipsoid cavity has been constructed which is designed to emit focused plane wave excitation over an area of 1 in. diameter, thus approximating to point excitation. The paper outlines the design and construction of the ellipsoid shell and discusses the design parameters in relation to the frequency response and footprint of the excitation. The results presented compare measurements acquired via this new method and the corresponding Frequency Response Functions obtained by the electrodynamic excitation. Significant differences are observable, largely arising from the mass loading effects associated with the standard modal testing procedures.
Skip Nav Destination
e-mail: M.Y. Amraoui@Bristol.ac.uk
e-mail: Nick.Lieven@bristol.ac.uk
Article navigation
January 2003
Technical Papers
Noncontacting Excitation and Measurement of Light Structures
Yacine M. Amraoui,
e-mail: M.Y. Amraoui@Bristol.ac.uk
Yacine M. Amraoui
Department of Aerospace Engineering, University of Bristol, Bristol BS8 1TR, England
Search for other works by this author on:
Nick A. J. Lieven
e-mail: Nick.Lieven@bristol.ac.uk
Nick A. J. Lieven
Department of Aerospace Engineering, University of Bristol, Bristol BS8 1TR, England
Search for other works by this author on:
Yacine M. Amraoui
Department of Aerospace Engineering, University of Bristol, Bristol BS8 1TR, England
e-mail: M.Y. Amraoui@Bristol.ac.uk
Nick A. J. Lieven
Department of Aerospace Engineering, University of Bristol, Bristol BS8 1TR, England
e-mail: Nick.Lieven@bristol.ac.uk
Contributed by the Technical Committee on Vibration and Sound for publication in the JOURNAL OF VIBRATION AND ACOUSTICS. Manuscript received February 2002; Revised August 2002. Associate Editor: M. I. Friswell.
J. Vib. Acoust. Jan 2003, 125(1): 114-119 (6 pages)
Published Online: January 6, 2003
Article history
Received:
February 1, 2002
Revised:
August 1, 2002
Online:
January 6, 2003
Citation
Amraoui, Y. M., and Lieven, N. A. J. (January 6, 2003). "Noncontacting Excitation and Measurement of Light Structures ." ASME. J. Vib. Acoust. January 2003; 125(1): 114–119. https://doi.org/10.1115/1.1526129
Download citation file:
Get Email Alerts
Cited By
Boundary-Element Analysis of the Noise Scattering for Urban Aerial Mobility Vehicles: Solver Development and Assessment
J. Vib. Acoust (October 2024)
Related Articles
Virtual Vibration Measurement Using KLT Motion Tracking Algorithm
J. Dyn. Sys., Meas., Control (January,2010)
Simulation of Structural Deformations of Flexible Piping Systems by Acoustic Excitation
J. Pressure Vessel Technol (August,2007)
Related Chapters
Concluding Remarks and Future Work
Ultrasonic Welding of Lithium-Ion Batteries
Vibration Measurement and Load Identification of Offshore Platforms
International Conference on Mechanical and Electrical Technology 2009 (ICMET 2009)
Occlusion Identification and Relief within Branched Structures
Biomedical Applications of Vibration and Acoustics in Therapy, Bioeffect and Modeling