Wuhui Pan , Hongyu Xie , Pengfei Ai , Rui Liu , Bo Gao , Shilin Xie , Yajun Luo , Yahong Zhang
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引用次数: 0
Abstract
Traditional high-static-low-dynamic stiffness (HSLDs) vibration isolator can effectively mitigate low frequency micro-amplitude vibration, but its isolation performance always deteriorates under large amplitude vibration due to the nonlinearity of negative stiffness spring. To address the issue, based on the convex-concave counteraction principle, a novel large linear stroke magnetic negative stiffness spring (LLS-MNSS) is proposed to construct a large linear stroke high-static-low-dynamic stiffness (LLS-HSLDs) vibration isolator. The LLS-MNSS is composed of four magnetic rings, which can be divided into a group exhibiting concave negative stiffness and another group exhibiting convex negative stiffness. The analytical magnetic stiffness model of the LLS-MNSS is firstly established. Based on parameters analyses and Taylor expansion expression of the theoretical magnetic stiffness model, an optimization model is built to minimize the variation degree of resultant magnetic negative stiffness. By solving the presented optimization problem, the parameters of LLS-MNSS are elaborately determined, effectively counteracting the variation of concave negative stiffness by that of the convex negative stiffness over a wide displacement range, and results in an approximately constant resultant magnetic negative stiffness within a stroke of (-6.7 mm, 6.7 mm). Besides, the designed LLS-MNSS possesses higher negative stiffness and more superior compactness when considering an identical linear stroke, as evidenced by the results of the comparative analysis between the LLS-MNSS and four existing magnetic negative stiffness springs with wide linear stroke. Finally, the theoretical and experimental results demonstrate that the low frequency vibration isolation performance of the LLS-HSLDs isolator exhibits remarkable stability even under large amplitude vibration.
期刊介绍:
Engineering Structures provides a forum for a broad blend of scientific and technical papers to reflect the evolving needs of the structural engineering and structural mechanics communities. Particularly welcome are contributions dealing with applications of structural engineering and mechanics principles in all areas of technology. The journal aspires to a broad and integrated coverage of the effects of dynamic loadings and of the modelling techniques whereby the structural response to these loadings may be computed.
The scope of Engineering Structures encompasses, but is not restricted to, the following areas: infrastructure engineering; earthquake engineering; structure-fluid-soil interaction; wind engineering; fire engineering; blast engineering; structural reliability/stability; life assessment/integrity; structural health monitoring; multi-hazard engineering; structural dynamics; optimization; expert systems; experimental modelling; performance-based design; multiscale analysis; value engineering.
Topics of interest include: tall buildings; innovative structures; environmentally responsive structures; bridges; stadiums; commercial and public buildings; transmission towers; television and telecommunication masts; foldable structures; cooling towers; plates and shells; suspension structures; protective structures; smart structures; nuclear reactors; dams; pressure vessels; pipelines; tunnels.
Engineering Structures also publishes review articles, short communications and discussions, book reviews, and a diary on international events related to any aspect of structural engineering.