文章信息/Info

Title:

 Progress in Study of Acoustic Multilayered Medium

作者:

 程營; 劉曉峻

 (南京大學聲學研究所 近代聲學教育部重點實驗室，江蘇 南京 210093)

Author(s):

 CHENG Ying;  LIU Xiaojun

 (Institute of Acoustics and Key Laboratory of Modern Acoustics of MOE,Nanjing University, Nanjing 210093, China)

關鍵詞:

聲學多層結構介質; 聲散射; 聲隱身斗篷

文獻標志碼:

A

摘要:

    首先回顧了聲學多層結構介質的研究歷史，在此基礎上簡要介紹了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面的一些工作進展。從聲學的角度，系統介紹了多層結構介質的有效介質理論，系統聲學參數的各向異性近似，在聲波隱身斗篷中的應用。通過嚴格散射理論推導和有限元數值模擬研究了聲斗篷系統的近場聲壓分布和遠場散射強度，發現該設計可在低頻較寬的頻帶范圍內顯著降低被遮蔽區域的聲散射截面；在此頻率區間內，聲信號散射截面隨著頻率的提高而增加，其截止頻率由薄層厚度決定。最后對該領域的研究作了若干展望。

Abstract:

    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 multilayered medium were presented. In the view point of acoustics, the effective�瞞edium theory, anisotropic effective parameter approximation, and the application in acoustic cloaking device were summarized and introduced. We use the rigorous scattering theory and finite element simulations to investigate the pressure field distribution and far field scattering pattern...