Research On Acoustic Functional Devices Based On Self-collimatio

This paper delves deeply into the self-collimation properties of phononic crystals in order to analyze acoustic functional devices,as well as further exploring the Fano resonance properties of acoustic metamaterials.1.This paper’s main contents are summarized in the introduction,which primarily reviews the research background of phononic crystals and the current status of acoustic artificial materials related to it.2.The basic theory of phononic crystal and its band gap and self-collimation characteristics are mainly described.Based on the theoretical study of phononic crystals,the frequency band range of self-collimation is calculated and verified by simulation.Then this paper studies the Fano resonance characteristics of acoustic metamaterials,mainly introduces the basic theory,linetype and application.3.In this paper,a sonic demultiplexer based on the self-collimation characteristics of 2D PCs is proposed.The sonic demultiplexer,which composed of three MachZehnder interference structure in a 2D PCs,can demultiplex the incident acoustic waves that containing multiple frequencies.Moreover,the frequencies of the incident sound beams can be manipulated by adjusting the internal parameters of the demultiplexer.Potential applications include acoustic communication and acoustic signal processing,especially for underwater circumstance.4.Based on the self-collimation effect,the two-dimensional phononic crystals acoustic notch filter is proposed.The acoustic notch filter is able to filter the sound waves at a specific frequency.By adjusting the radius of the beam splitter and the distance between the reflector and the beam splitter,the acoustic waves of multiple selfcollimating frequencies can be filtered.5.Due to the acoustic metamaterials have great flexibility in manipulating sound waves,and have advantage to achieve unprecedented functions.In this chapter,a twodimensional maze acoustic metamaterial is studied.The acoustic metamaterial has Fano resonance characteristics and can manipulate the acoustic waves in the low frequency.6.This dissertation’s summary and potential future study prospects are presented.