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Lightweight Structures with Adaptive Dynamic Behavior Through Evanescent Morphing

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Calm, Smooth and Smart

Part of the book series: Lecture Notes in Applied and Computational Mechanics ((LNACM,volume 102))

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Abstract

Compressible Constrained Layer Dam** (CCLD) is a novel semi-active dam** solution for vibration mitigation. The constrained dam** layer consists of a compressible dam** material with the thickness that can be adjusted in operando using fluid actuation. The actuation deformations, referred to as “evanescent morphing”, change both the dam** material properties and the amount of vibration-induced shear deformation, enabling a tuning of the overall structural dynamic behavior according to the excitation parameters. The CCLD can be applied to the entire surface of the vibrating structure or as patch only partially, without causing a significant increase of mass. This work demonstrates the potential of the dam** measure using different dam** materials. These materials were investigated and characterized at varying compression levels. The hereby obtained results were implemented in a numerical model that is discussed and validated. Experiments carried out on a single-curved shell structure with a partial CCLD patch coverage were carried out and served as the source of validation data.

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Notes

  1. 1.

    As a material with fundamentally different open cell morphology compared to PU foams.

  2. 2.

    Which is a theoretical limit in the case of a vacuum actuation.

  3. 3.

    In fact, this is also the reason why TTS is not feasible with most nonwovens.

  4. 4.

    This refers to the components of the vibration velocities that are perpendicular to a plane defined by the corner points of the curved shell.

  5. 5.

    The simulation results (Sect. 4.4) show a remarkably good agreement especially for the lowest compression level (\(k\,=\,5\,\%\)), which supports this assumption.

  6. 6.

    The reduction of the bending stiffness of the adaptive CCLD structure, caused by a decrease of the second moment of inertia with increasing compression, appears to play a minor role.

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Authors and Affiliations

  1. Technische Universität Dresden, Institute of Lightweight Engineering and Polymer Technology, Holbeinstr. 3, 01307, Dresden, Germany

    Tom Ehrig, Christoph Hildebrand, Klaudiusz Holeczek, Niels Modler & Pawel Kostka

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  1. Tom Ehrig
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  2. Christoph Hildebrand
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  3. Klaudiusz Holeczek
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  4. Niels Modler
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  5. Pawel Kostka
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Correspondence to Tom Ehrig .

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Editors and Affiliations

  1. Institute of Engineering and Computational Mechanics, University of Stuttgart, Stuttgart, Germany

    Peter Eberhard

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Ehrig, T., Hildebrand, C., Holeczek, K., Modler, N., Kostka, P. (2024). Lightweight Structures with Adaptive Dynamic Behavior Through Evanescent Morphing. In: Eberhard, P. (eds) Calm, Smooth and Smart. Lecture Notes in Applied and Computational Mechanics, vol 102. Springer, Cham. https://doi.org/10.1007/978-3-031-36143-2_8

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  • DOI: https://doi.org/10.1007/978-3-031-36143-2_8

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