摘要
采用数值分析方法,计算多自由度结构附带一个冲击减(吸)振器前、后,受突加外扰力的位移响应历程。运用线性振动理论,通过一个典型算例,详细分析冲击减振器对结构振动能量的耗散过程。揭示了碰撞发生时刻,振动能量在系统内各阶模态上转移、扩散规律,展示了冲击减振器快速抑制振动响应的效果及其稳健性。此外,还探讨提高冲击减振器快速耗能性能的途径,比较不同修改方案的能量耗散情况和抑振效果。
The numerical simulation is performed for the transient response of a multiple-degree-of-freedom （MDOF） structure induced by a shock-type excitation. Comparisons are made for the responses of the primary structure before and after attachment of a vibro-impact absorber to demonstrate its rapid mitigating effect on the vibration level as well as the robustness. The capacity of the energy dissipation and transfer of the absorber is researched on the basis of the linear vibration theory, and the redistribution of the modal energies due to the inelastic vibro-impact is revealed in detail. The design parameters of the vibro-impact absorber are studied so as to enhance its mitigation efficacy. The final results of the energy dissipation are explicitly illustrated with graphs.
出处
《机械工程学报》
EI
CAS
CSCD
北大核心
2014年第17期87-92,共6页
Journal of Mechanical Engineering
基金
航天技术支撑基金资助项目(2014-HT-XGD)
关键词
冲击减振器
瞬态响应
能量耗散
快速抑振
vibro-impact absorber
transient response
energy dissipation
rapid mitigation
