用声学黑洞调制和减轻翼型中的弯曲波
Flexural wave modulation and mitigation in airfoils using acoustic black holes
摘要：
本文介绍了翼型声学黑洞（ABH）的设计和实现框架。将广义多参数阻尼ABH母函数映射到NACA系列翼型上。具有代表性的几何形状和均匀分布的基线，都具有相同的结构质量和阻尼，使用多材料PolyJet 3D打印制造。沿翼弦的激光多普勒振动计测量响应于宽带0.1 - 12 kHz激励显示后缘振动减少多达10 dB，整个翼弦的宽带5 dB减少以及ABH嵌入翼片的弯曲波的实质性空间和时间调制。有限元分析（FEA）模型的开发和验证的基础上的测量数据。此外，参数有限元分析研究进行了一组可比的设计，以阐明可实现的调制范围。这些研究结果对翼型的后缘降噪、流动控制、结构强化和能量收集具有一定的指导意义。
英文摘要：
This study introduces a framework for the design and implementation of acoustic black holes (ABHs) in airfoils. A generalized multi-parameter damped-ABH generation function is mapped onto NACA series airfoils. Representative geometries and a uniformly distributed baseline, all with the same mass of structure and damping are fabricated using multi-material PolyJet 3D printing. Laser Doppler vibrometer measurements along the airfoil chord in response to a broadband 0.1 - 12 kHz excitation show a decrease in trailing edge vibrations by as much as 10 dB, a broadband 5 dB reduction across the entire chord as well as substantial spatial and temporal modulation of flexural waves by ABH-embedded foils. Finite element analysis (FEA) models are developed and validated based on the measured data. Furthermore, a parametric FEA study is performed on a set of comparable designs to elucidate the scope of modulation achievable. These findings are applicable to trailing-edge noise reduction, flow control, structural enhancement and energy harvesting for airfoils.
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