声子晶体通过一定的几何结构来控制弹性波的传播。目前的挑战在于如何设计几何可变的结构单元，组成声子晶体，使总体结构能方便地切换为多种几何模式，最终“智能地”产生出多种静力、动力学性能。在折纸艺术的启发下，有望攻克此难题。拟设计一种新型折叠式细胞单元，它具有2种稳态（“0”态和“1”态），不同稳态具有不同的刚度和固有频率，由此单元模块化地组成的材料将具有2的N次方种不同的力学性能（N为细胞单元个数）。普通的一块材料仅具有一种力学性能，而本设计将极大地拓展同一材料的性能和应用范围。利用材料的这种“可编程”机理，拟设计、制造新一代波导系统和声学隐身系统：通过设置单元“0”、“1”状态分布来巧妙地引导波的传播，及创造出在声学上“不可见”的结构。拟在理论、实验上理解此声子晶体静力学、动力学的“可编程”机理，提出新的应用方向，解决减振降噪的难题，具有重要的科学意义和光明的应用前景。

Phononic crystals control the propagation of elastic wave with certain geometry. Now, the challenge is how to design geometrically variable unit cell to form phononic crystals, which can switch into multiple geometrical patterns in order to “intelligently” yield multiple static and dynamic properties. Based on the inspiration of Origami, we can overcome this difficulty. We plan on designing a new kind of foldable unit cell, which has two stable states (“0” state and “1” state: corresponding to two minima of potential energy), and each state has an individual stiffness and resonant frequency. Thus, the material consisted of such unit cells has 2 power N different mechanical properties (N is the number of unit cells). An ordinary material has only one mechanical property, but our design will expand both property and application in great degree for the same material. Based on such “programmable” mechanism, we plan on designing/fabricating new generation of wave guide and cloak systems: guiding waves and making acoustically invisible structures by skillful arrangement of the distribution of “0” and “1” state for each unit. We plan on understanding the “programmable” mechanism in statics and dynamics both theoretically and experimentally, proposing new direction of application, and overcoming the difficulties of noise reduction. Therefore, this project has great science significance as well as promising future of application.