Time-Delay-Based Direct Wave Control of the Phononic Beam

Abstract

Traditional methods use nonlinear structures to achieve the property of nonreciprocal wave propagation. However, the nonreciprocal phenomenon only appears near the frequency where the nonlinear structure exhibits multi-stable resonance. Therefore, the nonreciprocal band is narrow and sensitive to the parameter of the nonlinearity. This paper, in another way, reports a new technique of time-delay tuning for direct wave control of the phononic beam. The time-delayed control is linear, which is convenient for theoretical analysis and experimental designing. The method of lattice approximation is used to model the electromechanical coupled phononic beam. Theoretical results show that a broadband nonreciprocal wave propagation can be realized.