期刊
APPLIED MATHEMATICAL MODELLING
卷 89, 期 -, 页码 249-267出版社
ELSEVIER SCIENCE INC
DOI: 10.1016/j.apm.2020.07.060
关键词
Nonlinear vibration; Energy harvesting; Vibration isolation; Electromagnet; Frequency-response function; Harmonic balance analysis
资金
- National Natural Science Foundation of China [11872037, 11872159, 11572182]
- Innovation Program of Shanghai Municipal Education Commission [2017-01-07-00-09E00 019]
An electromagnetic Stewart platform with high static and low dynamic stiffness is explored to reduce vibration in six degrees of freedom (6-DOFs) and harvest energy simultaneously. The use of stiffness nonlinearity improves vibration isolation efficiency, leading to lower frequencies for vibration isolation and considerable power output. Analytical and numerical results both support the extension of vibration isolation frequency band and reduced vibration transmissibility with increased energy harvesting.
An electromagnetic Stewart platform with high static and low dynamic stiffness is explored to reduce the vibration in six degrees of freedom (6-dofs) and simultaneously harvest energy. Each strut in the Stewart platform contains a moving electromagnet suspended between two fixed permanent magnets that are configured so that the magnet spring has both negative stiffness and soft nonlinearity. The use of stiffness nonlinearity improves vibration isolation efficiency. To obtain the frequency-response function for transmissibility and the power output in the first primary resonance, we apply the harmonic balance method, which is based on rigid-body dynamics and nonlinear elastic theory. The frequency response curves of the 6-dofs have peaks that redshift and bend leftward (toward lower frequencies), and a bubble-shaped resonance curve appears around the first resonance frequency. The numerical simulations support the analytical results. For various mechanical and electrical parameters, the analytical and numerical results both demonstrate that the frequency band of vibration isolation extends to lower frequencies and produces considerable power output. Moreover, the increase in energy harvesting leads to reduced vibration transmissibility under varying some parameters. (C) 2020 Elsevier Inc. All rights reserved.
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