文章信息/Info

Title:

 Progress in Study of Acoustic Multilayered Medium

作者:

 程營(yíng); 劉曉峻

 (南京大學(xué)聲學(xué)研究所 近代聲學(xué)教育部重點(diǎn)實(shí)驗(yàn)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(guān)鍵詞:

聲學(xué)多層結(jié)構(gòu)介質(zhì); 聲散射; 聲隱身斗篷

文獻(xiàn)標(biāo)志碼:

A

摘要:

    首先回顧了聲學(xué)多層結(jié)構(gòu)介質(zhì)的研究歷史，在此基礎(chǔ)上簡(jiǎn)要介紹了近幾年在聲學(xué)多層結(jié)構(gòu)介質(zhì)特異聲傳輸調(diào)控和原型聲學(xué)功能器件方面的一些工作進(jìn)展。從聲學(xué)的角度，系統(tǒng)介紹了多層結(jié)構(gòu)介質(zhì)的有效介質(zhì)理論，系統(tǒng)聲學(xué)參數(shù)的各向異性近似，在聲波隱身斗篷中的應(yīng)用。通過(guò)嚴(yán)格散射理論推導(dǎo)和有限元數(shù)值模擬研究了聲斗篷系統(tǒng)的近場(chǎng)聲壓分布和遠(yuǎn)場(chǎng)散射強(qiáng)度，發(fā)現(xiàn)該設(shè)計(jì)可在低頻較寬的頻帶范圍內(nèi)顯著降低被遮蔽區(qū)域的聲散射截面；在此頻率區(qū)間內(nèi)，聲信號(hào)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(duì)該領(lǐng)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...