二维声学黑洞对弯曲波的能量聚集效应

发布时间：2018-03-25 17:26

本文选题：声学黑洞　切入点：弯曲波　出处：《振动与冲击》2017年09期

【摘要】：声学黑洞(Acoustic Black Holes,ABH)效应是利用结构厚度以一定幂函数形式减小,致使弯曲波的相速度逐渐减小而实现能量逐渐聚集,理想情况下弯曲波波速减小为0从而无法传递到结构边缘,也就不会发生反射。声学黑洞效应使得结构产生高能量密度区域,因此能高效应用于能量回收和振动噪声控制。为了研究二维声学黑洞结构具有弯曲波能量聚集效应,运用有限元分析软件ABAQUS建立了二维声学黑洞模型,从时域上研究弯曲波在声学黑洞区域的传播过程,结合有限元数值结果与振动功率流的结果分析弯曲波能量聚集过程。最后通过激光超声实验系统对二维声学黑洞中弯曲波传播过程进行成像与分析,实验结果验证了二维声学黑洞结构对弯曲波能量的聚集效应。
[Abstract]:The acoustic black hole acoustic Black holeshike (ABH) effect is that the thickness of the structure is reduced by a certain power function, which causes the phase velocity of the curved wave to decrease gradually and the energy to gather gradually. Ideally, the velocity of the curved wave decreases to zero and can not be transferred to the edge of the structure. The acoustical black hole effect makes the structure produce high energy density region, so it can be applied to energy recovery and vibration noise control. In order to study the energy accumulation effect of curved wave in two-dimensional acoustic black hole structure, A two-dimensional acoustic black hole model is established by using the finite element analysis software ABAQUS. The propagation of curved waves in the acoustical black hole region is studied in time domain. Combined with finite element numerical results and vibration power flow, the energy accumulation process of curved wave is analyzed. Finally, the propagation process of curved wave in two-dimensional acoustic black hole is imaged and analyzed by laser ultrasonic experimental system. The experimental results verify the aggregation effect of 2-D acoustic black hole structure on bending wave energy.
【作者单位】：南京航空航天大学机械结构力学及控制国家重点实验室;香港理工大学机械工程系;
【基金】：国家自然科学基金重点项目(11532006) 机械结构力学及控制国家重点实验室(南京航空航天大学)自主研究课题资助(0515Y02) 中央高校基本科研业务费专项资金资助(NE2015101) 六大人才高峰C类(JXQC-002) 江苏高校优势学科建设工程资助项目江苏省重点基金项目(BK20150061)
【分类号】：O42

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