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TECHNICAL PAPERS

Measuring Rotational Degrees of Freedom Using a Laser Doppler Vibrometer

[+] Author and Article Information
M. J. Ratcliffe, N. A. J. Lieven

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

J. Vib. Acoust 122(1), 12-20 (May 01, 1997) (9 pages) doi:10.1115/1.568432 History: Received May 01, 1996; Revised May 01, 1997
Copyright © 2000 by ASME
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References

Figures

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Case study FE model, showing dense node structure, and experimental shaker attachment point
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(a) Analytical rotation estimations, θx rotation. (b) Analytical rotation estimations, θy rotation.
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(a) The variation of optimum measurement radius with added Gaussian noise. (b) Optimum measurement radii for differing numbers of measured points.
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Simple demonstration of outliers
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(a) Outlier removal, θx rotation. (b) Outlier removal, θy rotation.
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Deviations from the plane-fit
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Receptance roughness calculated at different levels of corruption
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Lightly perturbed model, case 1
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Disparity between the test case models
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Roughness disparity for the test case models
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Equivalent noise estimation
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Comparison of experimental and theoretical translation FRFs
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(a) Experimental and theoretical FRFs, θx rotation. (b) Experimental and theoretical FRFs, θy rotation.
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Case study model showing macro element assignment
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Final p-values for 1.5–4.5 mm tapered wing, with 0.5 percent hysteretic damping, 10 percent noise

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