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国家自然科学基金(11174138)

作品数:7 被引量:14H指数:2
相关作者:程建春梁彬袁樱王成会更多>>
相关机构:南京大学江苏理工学院陕西师范大学更多>>
发文基金:国家自然科学基金国家重点基础研究发展计划更多>>
相关领域:理学一般工业技术自动化与计算机技术电子电信更多>>

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7 条 记 录,以下是 1-10
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声单向操控研究进展被引量:8
2015年
电子二极管的发明标志着现代电子学的诞生,在整个人类社会中引起了科技的深刻变革.声波是一种具有非常悠久的研究历史的经典波,却始终被认为仅具有对称的传播形式.若能制造出可像电子二极管控制电流般实现声波单向导通的声学器件,显然将对整个声学研究领域产生重大影响,具有重要的科学意义及应用价值.第一个基于非线性媒质与声子晶体的声二极管利用非线性突破声学互易原理的局限,首次实现了将声能流限制在单一方向上的声整流效应.针对非线性系统转换效率低下的固有缺陷,在线性体系内围绕声单向传播这个重要科学问题开展了一系列理论和实验研究,设计与制备了多种具有特殊结构和性能的线性声学单向结构,在器件的效率、带宽及尺寸方面产生了突破.在声二极管研究的基础上,第一个可以像电子三极管操控电流般对声流进行操控与放大的声三极管理论模型也被提出.本文介绍了声单向传播这一新兴且富有蓬勃生机的研究领域中的主要进展.
梁彬袁樱程建春
关键词:声子晶体
艾里-贝塞尔波包的产生
<正>0引言空间非衍射波束一直是研究者们关注的热点,2007年,D. N. Christodoulides将艾里函数引入光学领域实现了艾里波束[1],后他人相继发现了马丢波束和韦伯波束等[2-4],这一类非衍射束在空间中...
丁玉江梁彬程建春
关键词:声传播
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The velocity field around two interacting cavitation bubbles in an ultrasound field被引量:2
2013年
A model is developed to calculate the distribution of first-order velocity field caused by the coupled bubbles in an ultrasound field. Using this model, numerical investigations of velocity field have been made when the two identical bubbles are driven well below resonance by an acoustic field with pressure amplitude exceeding cavitation threshold. Three representative kinestates of the coupled bubbles were chosen for analyzing the velocity distribution of surrounding liquid. The results show that the nonlinear oscillations of a bubble pair affect violently the radial velocity distribution of surrounding liquid, especially in the expanding phase. Symmetry of the tangential velocity distribution implies a possibility of attraction or repulsion of the bubble pairs.
WANG ChengHuiCHENG JianChun
基于声学超流体的隐身斗篷和幻象斗篷
0引言近年来,变换声学和超常材料以及建立在这两者之上的声隐身问题在科学界引起了研究热潮。在隐身斗篷的实际制备中,如何利用特殊结构的声超常材料来实现隐身斗篷所需的特殊声学参量一直以来是一个难点,国内外研究人员围绕该问题已经...
阚威威梁彬程建春
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Analytical model of an acoustic diode comprising a superlattice and a nonlinear medium被引量:1
2013年
We give an analytical analysis to the acoustic propagation in an acoustic diode (AD) model formed by coupling a superlattice (SL) with a nonlinear medium. Analytical solutions of the acoustic transmission are obtained by studying the propagations in the SL and the nonlinear medium separately with the conventional transfer-matrix method and a perturba- tion technique. Compared with the previous numerical method, the proposed approach contributes a better physical insight into the intrinsic mechanism of acoustic rectification and helps us to predict the performance of an AD within the effective rectifying bands in a simple way. This is potentially significant for the practical design and fabrication of AD devices.
顾仲明梁彬程建春
Interaction of a bubble and a bubble cluster in an ultrasonic field被引量:2
2013年
Using an appropriate approximation, we have formulated the interacting equation of multi-bubble motion for a system of a single bubble and a spherical bubble cluster. The behavior of the bubbles is observed in coupled and uncoupled states. The oscillation of bubbles inside the cluster is in a coupled state. The numerical simulation demonstrates that the secondary Bjerknes force can be influenced by the number density, initial radius, distance, driving frequency, and amplitude of ultrasound. However, if a bubble approaches a bubble cluster of the same initial radii, coupled oscillation would be induced and a repulsive force is evoked, which may be the reason why the bubble cluster can exist steadily. With the increment of the number density of the bubble cluster, a secondary Bjerknes force acting on the bubbles inside the cluster decreases due to the strong suppression of the coupled bubbles. It is shown that there may be an optimal number density for a bubble cluster which can generate an optimal cavitation effect in liquid for a stable driving ultrasound.
王成会程建春
基于声学人工材料的宽带三维声学聚焦
我们设计的声学人工材料利用局部相位响应来控制反射声场,从而实现在三维空间上任意位置处的宽带的声学聚焦。我们设计的声学人工材料单元可以实现在2π范围内对相位的任意的调控。这种三维的声学聚焦方法在超声治疗、无损检测等领域有潜...
范旭东朱一凡梁彬邹欣晔杨京程建春
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Improving the performance of acoustic invisibility with multilayer structure based on scattering analysis
2016年
In this paper, acoustic scattering from the system comprised of a cloaked object and the multilayer cloak with only one single pair of isotropic media is analyzed with a recursive numerical method. The designed acoustic parameters of the isotropic cloak media are assumed to be single-negative, and the resulting cloak can reduce acoustic scattering from an acoustic sensor while allowing it to receive external information. Several factors that may influence the performance of the cloak, including the number of layers and the acoustic dissipation of the medium are fully analyzed. Furthermore, the possibility of achieving acoustic invisibility with positive acoustic parameters is proposed by searching the optimum value in the parameter space and minimizing the scattering cross-section.
蔡琛袁樱阚威威杨京邹欣晔
关键词:METAMATERIALSSCATTERINGINVISIBILITY
声单向分束器
<正>0引言1声学分束器在声学信息处理和生物医学诊断等许多场景中有广泛的应用潜力,同时也在声学系统的设计和制造中发挥着作用。最近,由于声学人工材料的出现,提高了声学分束器的效率和灵活性[1-6]。李静等人通过引入线缺陷结...
唐一璠梁彬杨京杨军程建春
关键词:声子晶体散射体
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基于声学超表面的声波操控
声学超表面具有传统材料不具备的特殊声学性质。本文利用空间折叠结构和亥姆霍兹共鸣器,从理论上设计出两种亚波长的声学超表面,实现0到2?全相位范围内任意调控相位。通过合理控制结构参数,在实验上用空间折叠型声学超表面操控反射声...
江雪李勇梁彬邹欣晔程建春
关键词:亚波长
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