Method for regulating and controlling sound wave propagation path through boundary interception

Abstract

The invention discloses a method for regulating and controlling a sound wave propagation path through boundary interception. A plurality of rigid scatterers are regularly distributed in a two-dimensional plane of a matrix, primitive cell geometry and wave vector symmetry are broken by changing geometrical parameters, a Dirac cone at a boundary point of a Brillouin region is opened, a new band gapis generated, and therefore a propagation path of sound waves is regulated and controlled. According to the invention, boundary interception is adopted to regulate and control a sound wave propagationpath, and particularly, segmented regulation and control of sound waves in a band-gap frequency range can be realized on the same formed boundary by determining the specific position of interceptionon the basis of early research, that is, a filtering effect is realized. The boundary interception mode of the invention provides a new scheme for sound wave regulation and control, so that more options are provided for sound wave regulation and control.

Description

technical field [0001] The invention relates to the boundary state of the acoustic topological metamaterial, in particular to a method for controlling the sound wave propagation path through boundary interception, which can realize the filter control of the sound wave. Background technique [0002] Unlike general phononic crystals, for topological insulators, the material parameters do not play a crucial role in the band structure, but the symmetry of the structure plays a decisive role. There are two ways to change the symmetry, one is the time-reversal symmetry, and the other is the symmetry of the unit cell structure. Time-reversal symmetry is generally achieved by introducing water flow, air flow or spinning gyro into the structure. This physical mechanism is derived from the quantum Hall effect. The topological insulator thus constructed supports acoustic / elastic waves along the boundaries of a single structure and The superimposed interface propagates in one direction...

AI Technical Summary

Problems solved by technology

However, the previous research failed to realize the segmental control of the acoustic wave in the bandgap frequency range, and the filtering effect could not be realized. Through further research, we found that for a given acoustic topological metamaterial, only a specific position range By intercepting the boundary within the same boundary, the sound waves in different frequency ranges can be adjusted based on the same boundary, that is, the filtering can be realized.

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