附加式声学黑洞对悬臂板振动寿命影响研究  

Study on the effect of additional acoustic black hole on vibration life of cantilever plate

作　　者：邹宇琪 朱沈延 王超炎[1,2] 陶翀骢 张超 吴义鹏[1] 季宏丽[1] 裘进浩[1] ZOU Yu-qi;ZHU Shen-yan;WANG Chao-yan;TAO Chong-cong;ZHANG Chao;WU Yi-peng;JI Hong-li;QIU Jin-hao(State Key Laboratory of Mechanics and Control for Aerospace Structures,Nanjing University of Aeronautics and Astronautics,Nanjing 210016,China;Nanjing Institute of Information Technology,Nanjing 210016,China)

机构地区：[1]南京航空航天大学航空航天结构力学及控制全国重点实验室,江苏南京210016 [2]南京信息技术研究院,江苏南京210016

出　　处：《振动工程学报》2024年第10期1669-1678,共10页Journal of Vibration Engineering

基　　金：国家重点研发计划青年科学家项目(2021YFB3400100);国家自然科学基金资助项目(52235003,U2241261)。

摘　　要：结构在振动条件下的疲劳破坏对其自身的使用寿命以及使用者的人身安全均带来了隐患,目前对于解决结构振动疲劳有添加加强筋、敷设大量阻尼材料等方法,但往往效率较低,附加质量过大。为解决上述问题,提出将附加式声学黑洞(ABH)安装在结构上,通过降低结构响应达到降低应力幅值,延长使用寿命的目的。以悬臂板为基准结构,利用有限元方法进行了稳态动力学分析。结果表明,在附加矩形声学黑洞(RABH)后,悬臂板缺口处的应力响应明显降低。通过应力实验以及疲劳实验,验证了附加RABH可以降低结构危险点处应力响应,并延长悬臂板结构的振动疲劳寿命。The fatigue failure of the structure under vibration conditions has brought hidden dangers to its own service life and the personal safety of the user.At present,there are solutions for the structural vibration fatigue such as adding reinforcement bars and laying a large amount of damping materials,but the efficiency is often low and the additional mass is excessive.In order to solve the above problems,an additional acoustic black hole(ABH)is installed on the structure to reduce the stress amplitude and extend the service life by reducing the structural response.Using a cantilever plate as the reference structure,the steady state dynamics analysis is carried out by the finite element method.The results show that the stress response at the gap of cantilever plate is significantly reduced after the addition of rectangular acoustic black hole(RABH).Through stress and fatigue experiments,it is verified that additional RABH can reduce the stress response at the dangerous point of the structure and extend the vibration fatigue life of cantilever plate structure.

关 键 词：声学黑洞 悬臂板 振动疲劳 

分 类 号：TB535[理学—物理] O346.2[理学—声学]