利用强非线性减振器的模态能量再分配缓解大型结构的冲击响应

Translated title of the contribution: Shock response mitigation of a large-scale structure by modal energy redistribution facilitated by a strongly nonlinear absorber

Xiang Li, Alireza Mojahed, Li Qun Chen, Lawrence A. Bergman, Alexander F. Vakakis

Research output: Contribution to journalArticlepeer-review

Abstract

A lightweight geometrically nonlinear attachment, the strongly nonlinear absorber (SNA), is adopted to suppress the shock response of a linear, large-scale nine-story structure. The role of the SNA is not only to dissipate but also to redistribute the shock energy among the modes of the structure. In this study, single- and two-degree-of-freedom (SDOF and Two-DOF) SNAs are investigated. The quantitative results for shock energy redistribution indicate that with strong geometric nonlinearity, one can achieve low-to-high frequency nonlinear targeted energy transfer in this structure. Specifically, the percentages of shock energy dissipated by higher structural modes for the cases of locked SNA, SDOF SNA, and Two-DOF SNA are 0.08%, 0.43%, and 30.04%, respectively. The results indicate that the Two-DOF SNA is capable of rapidly scattering far more energy to much higher frequencies than the SDOF SNA, thereby more quickly reducing the shock response of the primary structure. The robustness of the performance of the SNAs is also studied for varying shock intensities, where the Two-DOF SNA is shown to be significantly more robust at scattering shock energy from low to high frequencies. Last, an effective damping measure is employed to verify and quantify the redistribution of the modal energies in the primary structure. The potential applications of this new passive shock mitigation method are discussed.

Translated title of the contributionShock response mitigation of a large-scale structure by modal energy redistribution facilitated by a strongly nonlinear absorber
Original languageChinese (Traditional)
Article number121464
JournalActa Mechanica Sinica/Lixue Xuebao
Volume38
Issue number6
DOIs
StatePublished - Jun 2022
Externally publishedYes

Keywords

  • Geometric nonlinearity
  • Modal energy redistribution
  • Shock response mitigation
  • Strongly nonlinear absorber
  • Targeted energy transfer

ASJC Scopus subject areas

  • Computational Mechanics
  • Mechanical Engineering

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