Design on Multiple L-Shaped Antisymmetric Low-Frequency and Wide Babd Gap Vibration Damping Structure

Abstract

Phononic crystal is a new artificial structure in which materials are arranged periodically in space. The periodic arrangement of material structure makes the phononic crystal show band gap characteristics. Phononic crystals have a very broad application prospect in noise reduction and vibration isolation because elastic waves cannot propagate in the band gap frequency range. How to obtain the low band gap while maintaining the structural stability is the key problem in the study of vibration isolation of phononic crystals. Based on elastic wave theory, a novel multiple L-shaped antisymmetric periodic structure of phonon crystal is designed and optimized. It is found that the phononic crystal made of low sonic velocity material has lower band gap frequency by comparing and analyzing the band gap of three common engineering materials. The phonon crystal is suitable for vibration isolation of protective glasses frame, mechanical cantilever beam, mechanical probe and other structures.