基于中空十四面体杆板混杂点阵结构的声学性能与力学性能研究  

Acoustic and mechanical properties of hollow tetrahedral strut and plate hybrid lattice structures

作　　者：李凌博 杨帆[1,2,3,4] 李鹏飞[1] 韩东[1] LI LingBo;YANG Fan;LI PengFei;HAN Dong(School of Aerospace Engineering and Applied Mechanics,Tongji University,Shanghai 200092,China;Key Laboratory of AI-aided Airworthiness of Civil Aircraft Structures,Civil Aviation Administration of China,Tongji University,Shanghai 100191,China;State Key Laboratory of Structural Analysis,Optimization and CAE Software for Industrial Equipment,Dalian University of Technology,Dalian 116024,China;Shanghai Institute of Aircraft Mechanics and Control,Tongji University,Shanghai 200092,China)

机构地区：[1]同济大学航空航天与力学学院,上海200092 [2]同济大学民航航空器结构智能辅助适航重点实验室,上海100191 [3]大连理工大学工业装备结构分析、优化与CAE软件国家重点实验室,大连116024 [4]上海飞行器力学与控制研究院,上海200092

出　　处：《中国科学:技术科学》2025年第2期261-269,共9页Scientia Sinica(Technologica)

基　　金：国家自然科学基金(批准号:12472077);冲击环境材料技术国家重点实验室开放基金(编号:WDZC2023-5);工业装备结构分析、优化与CAE软件国家重点实验室开放基金(编号:GZ23107);上海高校IV类高峰学科建设资助项目。

摘　　要：点阵结构因其轻质高强、高设计自由度,在承载、缓冲吸能和减振降噪方面具有广阔的应用前景.然而,传统类型的点阵结构很难同时具备较好的吸声性能和较强的承载性能.本文提出了一种新型三维轻质多功能结构——中空十四面体杆板(HTTP)混杂点阵结构,利用增材制造技术制备了实验试样.基于传递矩阵法建立了多级联类亥姆霍兹共振腔的理论模型,并进行了有限元数值模拟和阻抗管实验,实验、理论和数值结果具有良好的一致性.结果表明,板厚0.5 mm的HTTP在第二吸声峰处实现阻抗匹配,同时具有较高的平均吸声系数和宽带半吸收.通过数值均匀化方法和准静态压缩实验研究了HTTP的力学性能,结果表明,HTTP在板厚0.3 mm处实现了弹性各向同性.在压缩过程中杆件与板件相互作用形成了更加稳定的渐进弯曲变形模式,使其在塑性阶段表现出较高且稳定的平台应力.本文提出的HTTP多功能混合点阵结构可同时实现高吸声和强力学性能,为多功能轻质结构的设计提供了一种新的范式.Lattice structures have shown great promise in applications such as load-bearing,impact protection,sound absorption,and noise mitigation,owing to their lightweight nature,high specific mechanical properties,and extensive design flexibility.However,traditional lattice structures often struggle to achieve a balance between superior sound absorption and strong load-bearing capabilities.This study aims to introduce a novel acoustic-mechanical multifunctional structure:the hollow tetrahedral truss-plate(HTTP)hybrid lattice.Experimental specimens were fabricated using additive manufacturing techniques.A theoretical model of a multicascade Helmholtz resonance cavity is developed using the transfer matrix method,complemented by finite element numerical simulations and impedance tube experiments to validate its performance.A satisfactory agreement exists among the experimental,theoretical,and numerical results.The findings reveal that the HTTP structure,with a plate thickness of 0.5 mm,achieves impedance matching at the second absorption peak,along with a high average absorption coefficient and broadband semiabsorption performance.The mechanical properties of HTTP are evaluated using numerical homogenization methods and quasi-static compression experiments.The results demonstrate that the structure achieves elastic isotropy at a plate thickness of 0.3 mm.During compression,the interaction between the strut and plate forms a stable progressive bending deformation mode,leading to high and consistent plateau stresses during the plastic stage.The proposed HTTP multifunctional hybrid lattice structure successfully combines high sound absorption with robust mechanical properties,offering a novel paradigm for designing acoustic-mechanical multifunctional structures.

关 键 词：混杂点阵结构 吸声性能 力学性能 多功能 增材制造 

分 类 号：TB535[理学—物理]