Damping Analysis of Cylindrical Composite Structures with Enhanced Viscoelastic Properties
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Damping Analysis of Cylindrical Composite Structures with Enhanced Viscoelastic Properties Mathias Kliem1 · Jan Høgsberg1 · Joachim Vanwalleghem2 · 4 · Edith-Roland Fotsing5 · ¨ Angelos Filippatos3 · Stefan Hoschutzky 1 Christian Berggreen
Received: 5 February 2018 / Accepted: 14 March 2018 © Springer Science+Business Media B.V., part of Springer Nature 2018
Abstract Constrained layer damping treatments are widely used in mechanical structures to damp acoustic noise and mechanical vibrations. A viscoelastic layer is thereby applied to a structure and covered by a stiff constraining layer. When the structure vibrates in a bending mode, the viscoelastic layer is forced to deform in shear mode. Thus, the vibration energy is dissipated as low grade frictional heat. This paper documents the efficiency of passive constrained layer damping treatments for low frequency vibrations of cylindrical composite specimens made of glass fibre-reinforced plastics. Different cross section geometries with shear webs have been investigated in order to study a beneficial effect on the damping characteristics of the cylinder. The viscoelastic damping layers are placed at different locations within the composite cylinder e.g. circumferential and along the neutral plane to evaluate the location-dependent efficiency of constrained layer damping treatments. The results of the study provide a thorough understanding of constrained layer damping treatments and an improved damping design of the cylindrical composite structure. The highest damping is achieved when placing the damping layer in the neutral plane perpendicular to the bending load. The results are based on free decay tests of the composite structure. Keywords Composite structure · Passive damping treatment · Filament winding · Vibration analysis · Function integration
Mathias Kliem
[email protected] 1
Department of Mechanical Engineering, Technical University of Denmark, Lyngby, Denmark
2
Department of Materials Science and Engineering, Ghent University, Ghent, Belgium
3
Institute of Lightweight Engineering and Polymer Technology, Technische Universit¨at Dresden, Dresden, Germany
4
Leichtbau-Zentrum Sachsen GmbH, Dresden, Germany
5
Department of Mechanical Engineering, Polytechnique Montr´eal, Montr´eal, Canada
Appl Compos Mater
1 Introduction Glass fibre-reinforced plastics (GFRP) are well suited for use in high voltage applications, such as insulators or overhead transmission pylons, due to the inherent non-conductivity of the raw material. This enables a rigid attachment of overhead transmission lines to the cross arm of each composite pylon, resulting in an increased dynamic interaction. Induced vibrations, such as from the severe cable vibration phenomenon known as galloping, will therefore be directly transferred to the slender composite mast structure and may lead to catastrophic failure of the entire structure due to excessive vibration amplitudes at resonance Yang et al. [40]. These low-frequent galloping vibration amplitudes at frequencies between 0.5 Hz a
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