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TECHNICAL PAPERS

Noncontacting Excitation and Measurement of Light Structures

[+] Author and Article Information
Yacine M. Amraoui, Nick A. J. Lieven

Department of Aerospace Engineering, University of Bristol, Bristol BS8 1TR, England

J. Vib. Acoust 125(1), 114-119 (Jan 06, 2003) (6 pages) doi:10.1115/1.1526129 History: Received February 01, 2002; Revised August 01, 2002; Online January 06, 2003
Copyright © 2003 by ASME
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References

Weaver, H. J., and Dodell, J. K., 1984, “Modal Parameter Estimation via Shaker vs. Speaker Excitation,” Proceedings of the 2nd International Modal Analysis Conference-IMAC, pp. 887–893.
Musson,  B. G., and Stevens,  J. R., 1985, “Acoustic Excitation for Modal Response Measurement,” J. Sound Vib., 19(4), pp. 24–27.
Wu, J., and Moslehy, F. A., 1995, “On Modal Testing Using Speaker for Excitation,” Proceedings of the 13th International Modal Analysis Conference-IMAC, pp. 24–29.
Moslehy, F. A., and Wu, J., 1997, “Modal Testing Using two Speakers and Application to the Space Shuttle Tiles Bond Assessment,” Proceedings of the 15th International Modal Analysis Conference-IMAC, pp. 7–12.
Castellini, P., Esposito, E., Paone, N., and Tomasini, E. P., 1999, “Non-invasive Measurements of Damage of Frescoes Paintings and Icon by Laser Scanning Vibrometer: Experimental Results on Artificial Samples Using Different Types of Structural Exciters,” 6th World Conference on NDT and Microanalysis in Diagnostics and Conservation of Cultural and Environmental Heritage, 4 , 12, http://www.ndt.net/article/v04n12/tomasini/tomasini.htm
Castellini, P., Esposito, Miandro, F. E., Paone, N., Santolini, C., and Tomasini, E. P., 1999, “Non-invasive Measurements of Structural Damage by Laser Scanning Vibrometer: An Experimental Comparison Among Different Exciters,” Proceedings of the 17th International Modal Analysis Conference-IMAC, pp. 692–698.
Patton, M., and Trethawey, M., 1986, “A Technique for Non-contacting Modal Analysis of Ultra-light-weight Structure,” Proceedings of the 5th International Modal Analysis Conference-IMAC, pp. 1425–1431.
Saldner,  H. O., 1994, “Calibrated Non-contact Exciters for Optical Modal Analysis,” Vibration Measurements, SPIE, 2358, pp. 227–237.
Clark,  R. L., Fuller,  C. R., and Wicks,  A., 1991, “Characterization of Multiple Piezoelectric Actuators for Structural Excitation,” J. Acoust. Soc. Am., 90(1), pp. 346–357.
Gibbs,  G. P., and Fuller,  C. R., 1992, “Excitation of Thin Beams Using Asymmetric Piezoelectric Actuators,” J. Acoust. Soc. Am., 92(6), pp. 3221–3227.
Castellini, P., Revel, G. M., and Scalise L., 1999, “Laser Pulse Excitation for Modal Analysis,” Proceedings of the 17th International Modal Analysis Conference-IMAC, pp. 999–1004.
Kinsler, L. E., Frey, A. R., Coppens, A. B., and Sanders, J. V., 1982, Fundamentals of Acoustics, 3rd Edition, John Wiley and Sons, USA.
Broch, J. T., 1971, Acoustic Noise Measurements, 2nd Edition, Brüel & Kjær, Denmark.

Figures

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Geometrical properties of the ellipse
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The image source principle
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Geometric parameters and differential surfaces
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Influence of the dimensions on the response
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Choice of the eccentricity, with a reflection coefficient
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The dimensions of the ellipsoid
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Geometry of the real and image waves in the reflector
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Pressure distribution in the focus plane at various moments for excitation frequencies of 100, 500 and 1000 Hz
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(a) Schematic of the experimental set-up; (b) Overview of the experimental set-up.
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Sound pressure level with and without reflector
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Phase and Mobility functions for the shaker and the acoustic reflector

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