摘要
提出一种可集成于构件内部有限空间的结构-功能一体化新型金属局域共振结构,通过增材制造成形并对该结构的带隙特征进行了数值分析与试验验证。结果表明,所提出的结构存在一条低频带隙,其形成机理是基体中的弹性波与局域共振结构谐振特性发生耦合,将弹性波限制于谐振单元周围而非传递到基体中。随后,研究了局域共振单元的参数对带隙的调控规律。基于以上研究,通过梯度化设计参数,使相邻胞元的带隙产生重叠,进而扩大带隙的影响范围。经过仿真与试验验证,梯度结构带隙影响范围扩展至单一参数的2.35倍,可使悬臂梁振动峰值降低79.85%,表明该结构具有良好的低频宽带减振性能,在减振降噪领域具有广阔的工程应用前景。
A novel integrable structure-performance integrated metallic locally resonant structure fabricated via additive manufacturing was proposed.The bandgap characteristics were systematically investigated through numerical analysis and experimental validation.The results demonstrate that the proposed structure exhibits a low-frequency bandgap,whose formation mechanism arises from the coupling between elastic waves in the matrix and the resonant characteristics of locally resonant units,effectively confining elastic waves around the resonant units rather than transmitting them through the matrix.Subsequently,the regulatory effects of resonant unit parameters on bandgap characteristics were explored.Based on these findings,a gradient design strategy was implemented to overlap bandgaps from different unit cells,thereby extending the effective bandgap range.The simulations and experiments confirm that the gradient structure achieves a 2.35-fold expansion in bandgap coverage compared to single-parameter configurations,reducing the vibration peak of a cantilever beam by 79.85%.These results highlight the structure’s exceptional low-frequency broadband vibration suppression performance,demonstrating significant potential for engineering applications in vibration and noise reduction.
作者
张晨宇
黄明
尹青峰
陈捷
汤金钢
向政
张田昊
黄姝珂
ZHANG Chenyu;HUANG Ming;YIN Qingfeng;CHEN Jie;TANG Jingang;XIANG Zheng;ZHANG Tianhao;HUANG Shuke(Institute of Machinery Manufacturing Technology,China Academy of Engineering Physics,Mianyang 621000,China)
出处
《振动与冲击》
北大核心
2026年第6期85-93,共9页
Journal of Vibration and Shock
基金
国家自然科学基金委员会-中国工程物理研究院NSAF联合基金资助(U2130201)。
关键词
局域共振
激光粉末床熔融
带隙
声学超材料
结构-功能一体化
locally resonant
laser powder bed fusion
bandgap
acoustic metamaterial
structure-performance integrated
