超宽带声螺旋结构
发布时间：2018-11-07 20:03
【摘要】：超材料慢声器件具有非常灵活的相位控制能力,能够实现超薄的声透镜、声学整流器和声学自加速发生器等多种声学功能器件。但是,大多数慢声器件存在严重的色散、界面阻抗不匹配等问题,限制慢声器件只能在较窄的带宽工作。文章介绍了一种全新的螺旋型慢声器件,回顾了均匀螺距的螺旋结构超材料和螺距连续变化的螺旋结构超材料,深入分析了实现宽带零色散慢声器件和宽带高耦合效率的慢声器件的基本原理和设计规则。这些慢声器件可通过调整结构的螺距来灵活实现相位调节。最后,文章从数值和实验两个方面证明了按照一定规律排列的螺旋结构型超材料单元可以将入射的平面声波转换成按预设抛物线轨迹传输的艾里声束。
[Abstract]:Super-material slow-acoustic devices have a very flexible phase control capability, and can achieve ultra-thin acoustic lens, acoustic rectifier, acoustic self-accelerating generator and other acoustic functional devices. However, most slow sound devices have serious dispersion and interface impedance mismatch, which limit the slow sound devices to work in narrow bandwidth. In this paper, a new kind of helical slow sound device is introduced. The helical structure supermaterial with uniform pitch and the helical structure supermaterial with continuous variation of pitch are reviewed. The basic principles and design rules of wideband zero-dispersion slow acoustic devices and broadband high coupling efficiency slow sound devices are analyzed. These slow sound devices can flexibly adjust the phase by adjusting the pitch of the structure. Finally, from the numerical and experimental aspects, it is proved that the spiral structural metamaterial elements arranged according to certain rules can convert the incident plane acoustic wave into an Ellie sound beam propagating along a predetermined parabola trajectory.
【作者单位】： 黑龙江大学物理科学与技术学院黑龙江省超构材料物理与器件重点实验室;
【基金】：国家自然科学基金(批准号:11674119,11690030,11690032,11404125)资助项目
【分类号】：TB51
本文编号：2317429
[Abstract]:Super-material slow-acoustic devices have a very flexible phase control capability, and can achieve ultra-thin acoustic lens, acoustic rectifier, acoustic self-accelerating generator and other acoustic functional devices. However, most slow sound devices have serious dispersion and interface impedance mismatch, which limit the slow sound devices to work in narrow bandwidth. In this paper, a new kind of helical slow sound device is introduced. The helical structure supermaterial with uniform pitch and the helical structure supermaterial with continuous variation of pitch are reviewed. The basic principles and design rules of wideband zero-dispersion slow acoustic devices and broadband high coupling efficiency slow sound devices are analyzed. These slow sound devices can flexibly adjust the phase by adjusting the pitch of the structure. Finally, from the numerical and experimental aspects, it is proved that the spiral structural metamaterial elements arranged according to certain rules can convert the incident plane acoustic wave into an Ellie sound beam propagating along a predetermined parabola trajectory.
【作者单位】： 黑龙江大学物理科学与技术学院黑龙江省超构材料物理与器件重点实验室;
【基金】：国家自然科学基金(批准号:11674119,11690030,11690032,11404125)资助项目
【分类号】：TB51
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