中国材料进展
中國材料進展
중국재료진전
MATERIALS CHINA
2011年
10期
22-29
,共8页
声学多层结构介质%声散射%声隐身斗篷
聲學多層結構介質%聲散射%聲隱身鬥篷
성학다층결구개질%성산사%성은신두봉
acoustic multilayered medium%sound scattering%acoustic cloaking
首先回顾了声学多层结构介质的研究历史，在此基础上简要介绍了近几年在声学多层结构介质特异声传输调控和原型声学功能器件方面的一些工作进展。从声学的角度，系统介绍了多层结构介质的有效介质理论，系统声学参数的各向异性近似，在声波隐身斗篷中的应用。通过严格散射理论推导和有限元数值模拟研究了声斗篷系统的近场声压分布和远场散射强度，发现该设计可在低频较宽的频带范围内显著降低被遮蔽区域的声散射截面；在此频率区间内，声信号散射截面随着频率的提高而增加，其截止频率由薄层厚度决定。最后对该领域的研究作了若干展望。
首先迴顧瞭聲學多層結構介質的研究歷史，在此基礎上簡要介紹瞭近幾年在聲學多層結構介質特異聲傳輸調控和原型聲學功能器件方麵的一些工作進展。從聲學的角度，繫統介紹瞭多層結構介質的有效介質理論，繫統聲學參數的各嚮異性近似，在聲波隱身鬥篷中的應用。通過嚴格散射理論推導和有限元數值模擬研究瞭聲鬥篷繫統的近場聲壓分佈和遠場散射彊度，髮現該設計可在低頻較寬的頻帶範圍內顯著降低被遮蔽區域的聲散射截麵；在此頻率區間內，聲信號散射截麵隨著頻率的提高而增加，其截止頻率由薄層厚度決定。最後對該領域的研究作瞭若榦展望。
수선회고료성학다층결구개질적연구역사，재차기출상간요개소료근궤년재성학다층결구개질특이성전수조공화원형성학공능기건방면적일사공작진전。종성학적각도，계통개소료다층결구개질적유효개질이론，계통성학삼수적각향이성근사，재성파은신두봉중적응용。통과엄격산사이론추도화유한원수치모의연구료성두봉계통적근장성압분포화원장산사강도，발현해설계가재저빈교관적빈대범위내현저강저피차폐구역적성산사절면；재차빈솔구간내，성신호산사절면수착빈솔적제고이증가，기절지빈솔유박층후도결정。최후대해영역적연구작료약간전망。
The history of acoustic multilayered medium was reviewed at first. Then progress of the investigation on sound wave manipulation and functional-device prototype based on acoustic muhilayered medium were presented. In the view point of acoustics, the effective-medium theory, anisotropic effective parameter approximation, and the application in a- coustic cloaking device were summarized and introduced. We use the rigorous scattering theory and finite-element simula- tions to investigate the pressure field distribution and far-field scattering pattern. We find that the proposal works efficiently in a wide bandwidth in which the cloaking efficiency decreases with increasing frequency. The working frequency of the cloak depends on the thickness of the layered medium. Finally, some outlook on the potential research directions was dis- Cussed.
