摘要
Abstract
[Objective]Based on the acoustic black hole and anti-resonance theories,this paper presents an elastic anti-resonant energy harvester which is suitable for multi-frequency domain vibration reduction.[Methods]By adjusting the structural parameters of the energy harvester,low and medium frequency vibra-tions on the transmission path and the source of the power equipment can be reduced accurately,addressing the disadvantage of the traditional acoustic black hole structure with poor low-frequency range vibration re-duction effects.The Rayleigh method is used to derive the fundamental frequency calculation formula of the energy harvester.The designed multilayer energy harvester is then applied to a standard ship engine room pan-el and its vibration reduction effect is verified.In accordance with the research results,the vibration reduction rules and effect are analyzed,and corresponding improvements are made.[Results]The average vibration speed level near the first resonance frequency of the engine room panel with a nine-layer energy harvester group is reduced by about 8.7 dB,and the peak value of the frequency response curve shows a broadband re-duction.By adjusting the size and position of the added mass,the improved multi-mode energy harvester can participate in the vibration reduction of the structure.[Conclusions]Compared with the traditional embed-ded two-dimensional acoustic black hole structure,the elastic anti-resonant energy harvester proposed herein features small additional mass and non-destructive structural strength,and can be designed in any combination,giving it good application value for targeted ship vibration and noise reduction in the low frequency band.关键词
振动控制/阻尼/隔振/反共振俘能器/声学黑洞/Rayleigh能量法/局域共振/低频减振Key words
vibration control/damping/vibration insulation/anti-resonant energy harvester/acoustic black hole/Rayleigh energy method/local resonance/low-frequency vibration reduction分类
交通工程
