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, the authors used the partition of unity finite element method (PUFEM) for the development of enriched Mindlin plate elements, which are obtained as the product of partitioning of unity functions with arbitrary chosen enrichment functions and are therefore similar to a p-FEM technique.
26 citations
TL;DR: In this paper, a finite element model has been developed for analyzing active constrained layer damping (ACLD) of laminated cylindrical composite shells using vertically and obliquely reinforced 1-3 piezoelectric composite materials as the material of the constraining layer of the ACLD treatment.
26 citations
TL;DR: In this paper, two configurations of the resulting hybrid treatment are considered, where active control and passive control operate separately, whereas in the second configuration, the two operate in unison to maximize the energy dissipation characteristics.
Abstract: Conventional passive constrained layer damping treatments with viscoelastic cores are provided with built-in sensing and actuation capabilities to actively control and enhance their vibration damping charac teristics. Two configurations of the resulting hybrid treatment are considered in this paper. In the first configuration, the active control and passive operate separately, whereas in the second configuration, the two operate in unison to maximize the energy dissipation characteristics. In this study, three objectives are accomplished. The first objective aims at the design and implementation of robust H∞) controllers for the separated and unified control strategies. In the second, the performance of the H∞ controllers at different operating frequencies and temperatures is compared with that of a conventional proportional/derivative controller to demonstrate robustness. Finally, a control effort study involving the H∞ controllers for the separated and unified control strategies is shown to assess the e...
26 citations
Patent•
24 Sep 1990
TL;DR: In this paper, small amounts of rubbery polymer particles (especially core-shell polymers) are incorporated in the viscoelastic copolymer to alleviate the high temperature and brittleness of the copolymers.
Abstract: Constrained layer damping structures are often based on viscoelastic layers of iso-octyl acrylate:acrylic acid or analogous copolymers. As the acrylic acid content is increased, the peak damping temperature also increases; unfortunately, however, the copolymer becomes more brittle and susceptible to shock, especially at low temperatures. Incorporating small amounts of rubbery polymer particles (especially core-shell polymers) in the viscoelastic copolymer alleviates this problem.
26 citations
TL;DR: In this paper, a clamped-free beam with partial active constrained layer damping (ACLD) treatment is modelled by using the finite element method to account for the frequency-dependent characteristic of the viscoelastic material (VEM).
26 citations