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Compared to traditional linear vibration absorber (LVA), nonlinear vibration absorber (NVA) has been proved to be more effective in terms of frequency range and/or magnitude of vibration suppression. Nonlinear energy sink (NES) is one representative NVA. Recently, parallel NESs have been investigated by many researchers. However, there is still a lack of study on parallel NESs featuring multistability. To address this gap, this study investigates the vibration suppression capabilities of parallel NESs with tristability introduced by three repulsive magnets (P-3RMNESs) under strong impulse excitation. The dynamic model of the whole system is formulated considering beam rotation and bending, and dipole–dipole model of magnetic force. For a fair comparison, the critical parameters of both the single 3RMNES and P-3RMNESs are optimized using the genetic algorithm. Simulation results reveal that with the same mass, the optimized P-3RMNESs with tristability has better performance compared to the optimized single 3RMNES with tristability. This work provides an approach for designing effective parallel NESs for strong impulse response mitigation.

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Vibration Suppression Performance of Parallel Nonlinear Energy Sinks Under Strong Impulse Excitation

  • 会议论文

  • 发表日期：

    2025年

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  • Muxuan Guo,
  • Lihua Tang

摘要

Compared to traditional linear vibration absorber (LVA), nonlinear vibration absorber (NVA) has been proved to be more effective in terms of frequency range and/or magnitude of vibration suppression. Nonlinear energy sink (NES) is one representative NVA. Recently, parallel NESs have been investigated by many researchers. However, there is still a lack of study on parallel NESs featuring multistability. To address this gap, this study investigates the vibration suppression capabilities of parallel NESs with tristability introduced by three repulsive magnets (P-3RMNESs) under strong impulse excitation. The dynamic model of the whole system is formulated considering beam rotation and bending, and dipole–dipole model of magnetic force. For a fair comparison, the critical parameters of both the single 3RMNES and P-3RMNESs are optimized using the genetic algorithm. Simulation results reveal that with the same mass, the optimized P-3RMNESs with tristability has better performance compared to the optimized single 3RMNES with tristability. This work provides an approach for designing effective parallel NESs for strong impulse response mitigation.