Topic
Constrained-layer damping
About: Constrained-layer damping is a research topic. Over the lifetime, 795 publications have been published within this topic receiving 15758 citations.
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TL;DR: In this paper, H∞ optimization based controllers are designed and implemented experimentally on a flexible beam with active constrained layer damping treatment, and they outperform linear quadratic Gaussian (LQG) controllers both in terms of robust stability and robust performance.
Abstract: It is a well known fact that system parameters of flexible structures keep on changing because of several reasons. Ordinary controllers lose their effectiveness in changed situations and do not guarantee the stability of the closed loop (CL) system. However, controllers designed based on robust control theory not only maintain the CL stability of the perturbed system for a large variation in system parameters but also maintain best performance. In this work, H∞ optimization based controllers are designed and implemented experimentally on a flexible beam with active constrained layer damping treatment. It is observed that H∞ loop shaping design procedure based controllers outperform linear quadratic Gaussian and standard H∞controllers both in terms of robust stability and robust performance. Relative merits and demerits of the controllers designed using μ- synthesis technique are also discussed. It has also been observed that time domain results also explain some of the important facts. Certain time domain...
9 citations
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9 citations
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TL;DR: In this paper, flexible silicone macromolecules were inserted into organo-modified montmorillonite (OMMT) by intercalation to prepare a layered structure that is similar to a constrained layer damping structure unit.
Abstract: In this paper, the possibility of improving the damping properties of epoxy resin through dispersion of silicone-intercalated organic montmorillonite was investigated. Flexible silicone macromolecules were inserted into organo-modified montmorillonite (OMMT) by intercalation to prepare a layered structure that is similar to a constrained layer damping structure unit. The effects of silicone macromolecule type, weight ratio of silicone–OMMT and solvent for the intercalation on the structure and properties of the composites were studied by X-ray diffraction (XRD), dynamic mechanical analysis (DMA), and transmission electron microscopy (TEM). The influence of the silicone-intercalated OMMT with different content on the damping properties of the materials was also investigated. The damping properties of the final, cured materials were probed using DMA. Analysis by XRD and TEM proved that the silicone-intercalated OMMT had been successfully prepared using an appropriate process. The presence of the silicone-intercalated OMMT decreased the glass transition temperature (Tg) of the epoxy, and the epoxy-nanocomposites achieved a better damping performance.
9 citations
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TL;DR: In this paper, the first order differential matrix equations of the host shell and constrained layer for a sandwich rotational shell are derived based on the thin shell theory, only considering the shearing deformation of the viscoelastic layer, and a highly precise transfer matrix method is developed by extended homogeneous capacity precision integration technology.
9 citations
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TL;DR: In this paper, a design of 1-3 smart viscoelastic composite (SVC) is proposed for the augmentation of unconstrained/constrained layer damping treatment of beam.
9 citations