Non-contact experimental assessment of apparent dynamic stiffness of constrained-layer damping sandwich plates in a broad frequency range using a NdYAG pump laser and a laser Doppler vibrometer.pdfVIP

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Non-contact experimental assessment of apparent dynamic stiffness of constrained-layer damping sandwich plates in a broad frequency range using a NdYAG pump laser and a laser Doppler vibrometer.pdf

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Non-contact experimental assessment of apparent dynamic stiffness of constrained-layer damping sandwich plates in a broad frequency range using a NdYAG pump laser and a laser Doppler vibrometer.pdf

Journal of Sound and Vibration 395 (2017) 90 –101 Contents lists available at ScienceDirect Journal of Sound and Vibration journal homepage: /locate/jsvi Non-contact experimental assessment of apparent dynamic stiffness of constrained-layer damping sandwich plates in a broad frequency range using a Nd:YAG pump laser and a laser Doppler vibrometer N.B. Roozen a,n, L. Labelle a, Q. Leclère b, K. Ege b, S. Alvarado a a Katholieke Universiteit Leuven, Laboratory of Acoustics, Soft Matter and Biophysics, Department of Physics and Astronomy, Celestijnenlaan 200D, 3001 Leuven, Belgium b Univ Lyon, INSA-Lyon, LVA EA677, F-69621 Villeurbanne, France a r t i c l e i n f o a b s t r a c t Article history: This paper concerns the assessment of the dynamic stiffness of plates using non-contact Received 17 October 2016 excitation and non-contact measurements. In particular, a constrained-layer damping Received in revised form sandwich plate is considered, of which the apparent dynamic stiffness as function of 3 February 2017 frequency is determined. The experimental results compare very well with an analytical Accepted 6 February 2017 model that computes the frequency dependent apparent bending stiffness of the con- Handling editor: Z. Su Available online 12 February 2017 strained-layer damping sandwich plate. A Nd:YAG laser is used for excitation of the plate and a laser Doppler vibrometer is used to measure its dynamic response along a line o