We present a spectral finite element model (SFEM) for sandwich beams with passive constrained layer damping (PCLD) treatments. The viscoelastic core has a complex modulus that varies with frequency. The SFEM is formulated in the frequency domain using dynamic shape functions based on the exact displacement solutions from progressive wave methods, where we implicitly account for the frequency dependent complex modulus of the viscoelastic core. The SFEM results of natural frequencies and frequency response functions are compared to those calculated using conventional finite element (CFEM), where the Golla-Hughes-McTavish method is used to account for the frequency dependent complex modulus of a viscoelastic core. Also experimental data are used to validate both analyses using frequency response functions measured for two cantilevered sandwich beams with PCLD treatments having 50% and 75% coverage of the beam length. SFEM shows improved computational efficiency and accuracy, because many more elements must be incorporated into the CFEM for comparable accuracy.
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July 2002
Technical Papers
Spectral Finite Element Analysis of Sandwich Beams With Passive Constrained Layer Damping1
Gang Wang, Graduate Research Assistant,
Gang Wang, Graduate Research Assistant
Smart Structures Laboratory, Alfred Gessow Rotorcraft Center, Dept. of Aerospace Engineering, University of Maryland, College Park, MD 20742
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Norman M. Wereley, Associate Professor, Mem. ASME
Norman M. Wereley, Associate Professor, Mem. ASME
Smart Structures Laboratory, Alfred Gessow Rotorcraft Center, Dept. of Aerospace Engineering, University of Maryland, College Park, MD 20742
Search for other works by this author on:
Gang Wang, Graduate Research Assistant
Smart Structures Laboratory, Alfred Gessow Rotorcraft Center, Dept. of Aerospace Engineering, University of Maryland, College Park, MD 20742
Norman M. Wereley, Associate Professor, Mem. ASME
Smart Structures Laboratory, Alfred Gessow Rotorcraft Center, Dept. of Aerospace Engineering, University of Maryland, College Park, MD 20742
Contributed by the Technical Committee on Vibration and Sound for publication in the JOURNAL OF VIBRATION AND ACOUSTICS. Manuscript received Apr. 2000; Revised Feb. 2002. Associate Editor: H. S. Tzou.
J. Vib. Acoust. Jul 2002, 124(3): 376-386 (11 pages)
Published Online: June 12, 2002
Article history
Received:
April 1, 2000
Revised:
February 1, 2002
Online:
June 12, 2002
Citation
Wang, G., and Wereley, N. M. (June 12, 2002). "Spectral Finite Element Analysis of Sandwich Beams With Passive Constrained Layer Damping." ASME. J. Vib. Acoust. July 2002; 124(3): 376–386. https://doi.org/10.1115/1.1469007
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