Flow aeroacoustic damping using coupled mechanical–electrical impedance in lined pipeline
Chen Yong (陈勇)a, Huang Yi-Yong (黄奕勇)a, Chen Xiao-Qian (陈小前)a, Bai Yu-Zhu (白玉铸)b, Tan Xiao-Dong (谭晓栋)b
a College of Aerospace Science and Engineering, National University of Defense Technology, Changsha 410073, China; b Department of Electronic Technology, Officer's College of CAPF, Chengdu 610213, China
Abstract We report a new noise-damping concept which utilizes a coupled mechanical–electrical acoustic impedance to attenuate an aeroacoustic wave propagating in a moving gas confined by a cylindrical pipeline. An electrical damper is incorporated to the mechanical impedance, either through the piezoelectric, electrostatic, or electro-magnetic principles. Our numerical study shows the advantage of the proposed methodology on wave attenuation. With the development of the micro-electro-mechanical system and material engineering, the proposed configuration may be promising for noise reduction.
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