本文選題：聲學(xué)超材料　切入點：聲學(xué)透鏡　出處：《南京大學(xué)學(xué)報(自然科學(xué))》2015年06期 　論文類型：期刊論文

【摘要】：基于等效媒質(zhì)理論提出了一種由新型聲學(xué)超材料設(shè)計的漸變折射率透鏡.根據(jù)電磁學(xué)與聲學(xué)基本參數(shù)存在的類比關(guān)系,參照電磁人工材料設(shè)計中提取單元結(jié)構(gòu)的等效電導(dǎo)率和等效磁導(dǎo)率的方法,分別提取單元結(jié)構(gòu)的等效彈性模量和等效質(zhì)量密度,并進一步求得其等效相對阻抗和等效折射率,對設(shè)計的透鏡進行有限元數(shù)值仿真在寬頻范圍內(nèi)得到了與實驗一致的偏折角度.該透鏡由光敏樹脂3D打印制成,與傳統(tǒng)透鏡相比,它具有尺寸小、設(shè)計簡單、精度高,重量輕等特點.仿真結(jié)果和測試結(jié)果吻合較好,進一步驗證了聲電類比設(shè)計方法的可行性,為設(shè)計寬頻帶新型聲學(xué)參數(shù)人工材料提供了一種新途徑.
[Abstract]:Based on the equivalent medium theory, a gradient refractive index lens designed by a new type of acoustic supermaterial is proposed. According to the analogical relationship between electromagnetism and the basic acoustic parameters, According to the method of extracting the equivalent conductivity and the equivalent permeability of the element structure in the electromagnetic artificial material design, the equivalent elastic modulus and the equivalent mass density of the element structure are extracted, and the equivalent relative impedance and the equivalent refractive index of the unit structure are obtained. The deflection angle of the designed lens is obtained by finite element numerical simulation in the wide band range. The lens is made of Guang Min resin 3D printing. Compared with the traditional lens, the lens has the advantages of small size, simple design and high precision. The simulation results are in good agreement with the test results, which further verifies the feasibility of the design method of acoustoelectric analogy, and provides a new way for the design of new acoustic parameters artificial materials with wide band.
【作者單位】： 東南大學(xué)毫米波國家重點實驗室;
【基金】：江蘇省杰出青年基金(BK2012019)
【分類號】：O441.6;TB39

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