1] Graduate Aerospace Laboratories (GALCIT), California Institute of Technology, Pasadena, California 91125, USA [2] Department of Aeronautics and Astronautics, University of Washington, Seattle, Washington 98195-2400, USA.
1] Graduate Aerospace Laboratories (GALCIT), California Institute of Technology, Pasadena, California 91125, USA [2] Department of Mechanical and Process Engineering (D-MAVT), Swiss Federal Institute of Technology (ETH), Zurich 8092, Switzerland.
Nat Commun. 2014 Oct 30;5:5311. doi: 10.1038/ncomms6311.
Electrical flow control devices are fundamental components in electrical appliances and computers; similarly, optical switches are essential in a number of communication, computation and quantum information-processing applications. An acoustic counterpart would use an acoustic (mechanical) signal to control the mechanical energy flow through a solid material. Although earlier research has demonstrated acoustic diodes or circulators, no acoustic switches with wide operational frequency ranges and controllability have been realized. Here we propose and demonstrate an acoustic switch based on a driven chain of spherical particles with a nonlinear contact force. We experimentally and numerically verify that this switching mechanism stems from a combination of nonlinearity and bandgap effects. We also realize the OR and AND acoustic logic elements by exploiting the nonlinear dynamical effects of the granular chain. We anticipate these results to enable the creation of novel acoustic devices for the control of mechanical energy flow in high-performance ultrasonic devices.
电流控制装置是电器和计算机的基本组成部分；同样，光开关在许多通信、计算和量子信息处理应用中也是必不可少的。声学对应物将使用声（机械）信号来控制通过固体材料的机械能流。尽管早期的研究已经证明了声二极管或循环器，但没有实现具有宽工作频率范围和可控性的声学开关。在这里，我们提出并演示了一种基于具有非线性接触力的驱动链球形颗粒的声学开关。我们通过实验和数值验证了这种开关机制源于非线性和带隙效应的组合。我们还通过利用颗粒链的非线性动力学效应来实现 OR 和 AND 声逻辑元件。我们预计这些结果将能够为在高性能超声设备中控制机械能流创造新型声学器件。
