中文摘要：

在这份报纸，一条宽带单向性的声学的传播基于有光线的 piecewise 的不同类的 metamaterial 壳，线性健全速度分发被建议。在从壳的外部、内部的发生的情况中的声学的光线被几何声学的理论推出在极的坐标系统显示出单向性的声学的繁殖。数字完整波浪的模拟揭示传播在一个宽频率范围上有紧张无关的单向性的传播特征的那一个方法。最后，为建议的实现的一个计划传播模型被使用 multilayered 材料设计并且模仿的方法，在噪音控制，声学的整流器，波浪吸收和相关的域建议它的潜在的应用程序。

英文摘要：

In this paper, a broadband unidirectional acoustic transmission based on inhomogeneous metamaterial shell with radial piecewise linear sound speed distribution is proposed. Acoustic rays in the case of external and internal incidences from the shell are deduced by geometric acoustic theory to show the unidirectional acoustic propagation in the polar coordinate system. Numerical full-wave simulations reveal that one way transmission has the intensity-indepen- dent unidirectional transmission feature over a wide frequency range. Finally, a scheme for realization of the proposed one way transmission model is designed and simulated by using multilayered materials, suggesting its potential applications in noise control, acoustic rectifiers, wave absorption and related fields.