Vibration absorption of parallel-coupled nonlinear energy sink under shock and harmonic excitations

• 作者: Jian'en CHEN Wei ZHANG Jun LIU Wenhua HU
• 来源期刊: 应用数学和力学（英文版）
• 年，卷（期）: 2021,（8）
• 页码范围: 1135-1154
• 页数: 20页
• 分类号: O327
• 语种: 英文

摘要

Nonlinear energy sink (NES) can passively absorb broadband energy from primary oscillators.Proper multiple NESs connected in parallel exhibit superior perfor-mance to single-degree-of-freedom (SDOF) NESs.In this work,a linear coupling spring is installed between two parallel NESs so as to expand the application scope of such vi-bration absorbers.The vibration absorption of the parallel and parallel-coupled NESs and the system response induced by the coupling spring are studied.The results show that the responses of the system exhibit a significant difference when the heavier cubic oscillators in the NESs have lower stiffness and the lighter cubic oscillators have higher stiffness.Moreover,the efficiency of the parallel-coupled NES is higher for medium shocks but lower for small and large shocks than that of the parallel NESs.The parallel-coupled NES also shows superior performance for medium harmonic excitations until higher re-sponse branches are induced.The performance of the parallel-coupled NES and the SDOF NES is compared.It is found that,regardless of the chosen SDOF NES parameters,the performance of the parallel-coupled NES is similar or superior to that of the SDOF NES in the entire force range.