Experimental Modal Analysis of Structures with Conventional Versus Contact-Free Suspension

Schneider, Sarah; Mallareddy, Tarun Teja; Alarcón, Daniel; Kamenzky, Robert; Blaschke, Peter

doi:10.1007/978-3-319-75390-4_13

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“…In general, modal analyses on lightweight materials, especially with small specimen size, are difficult to perform [49]. In a study, which compares the specimen support on foam with support on a specially designed air bed, the effect on additional damping was less pronounced for the foam bedding, proving the applicability for small specimens [50]. For future investigations on panels, however, different support conditions (free hanging panels for example) could be considered to further improve the damping measurements on larger HyCEML geometries.…”

Section: Modal Analysis With Pulse Excitationmentioning

confidence: 99%

Wide Scale Characterization and Modeling of the Vibration and Damping Behavior of CFRP-Elastomer-Metal Laminates—Comparison and Discussion of Different Test Setups

et al. 2021

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The investigated hybrid carbon fiber reinforced plastics-elastomer-metal laminates (HyCEML) offer the potential of tailored structural materials with adaptable damping properties. Conventional fiber metal laminates, like glass laminate aluminum reinforced epoxy are already widely spread in the aviation industry owing to their outstanding fatigue behavior. By integrating an elastomeric interlayer, the glass fibers can be substituted by carbon fibers and damping properties of these laminates can be adjusted. The viscoelastic interlayer dissipates energy within the laminate by inducing shear strain during bending, which is commonly known as constrained layer damping. The aim of this paper is the description of the vibration and damping behavior of HyCEML over a wide temperature and frequency range by using different test methods. Dynamic mechanical analysis is used for the individual polymeric constituents and coupon specimens and modal analysis is used with different specimen geometries up to a component sized panel. In addition, analytical and numerical approaches complement the experiments and lead to a deeper understanding of the vibration and damping behavior. Owing to the high damping, already at frequencies of 5 kHz only running waves can be detected for the investigated panel size. The discussion of different test methods helps to identify material and wavelength dependent effects, but also possible adverse effects of certain methods.

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Section: Modal Analysis With Pulse Excitationmentioning

confidence: 99%