Dual-Function Cloak of Edge Target in Metamaterial Plate with Active Intelligent Control

Abstract

Wave invisibility has attracted great attention because of its significant influences on mechanical, acoustic, and many other fields, and it has a great potential application to practical engineering. In this work, a dual-function cloak is proposed in which there is an edge object with an intelligent control system in an elastic wave metamaterial plate. Based on the image and scattering cancellation methods, the scattering mode coefficients are derived. The effects of material and structural parameters on dynamic stress concentration and scattering amplitude are investigated. The cloaking configuration consists of concentric layers of piezoelectric (lead–zirconate–titanate [PZT]) patches, which are connected with the intelligent control system. The theoretical and experiment results show that the dual-function cloak can effectively reduce the dynamic stress concentration and scattering amplitude. Compared to the range from 100 to 450 Hz for the original structure without a control system, the effective frequency range of the intelligent cloak can be extended from 100 to 500 Hz. The present design with both strength enhancement and invisibility of the edge target is expected to provide new ideas for the development of mechanical metamaterials and novel structures.