Acoustic fault signal extraction via the line-defect phononic crystals

作     者：Tinggui CHEN Bo WU Dejie YU Tinggui CHEN;Bo WU;Dejie YU

作者机构：State Key Laboratory of Advanced Design and Manufacturing for Vehicle BodyCollege of Mechanical and Vehicle EngineeringHunan UniversityChangsha 410082China 

出 版 物：《Frontiers of Mechanical Engineering》 (机械工程前沿（英文版）)

年 卷 期：2022年第17卷第1期

页      面：148-158页

核心收录：

学科分类：08[工学] 0803[工学-光学工程] 

基　　金：This paper was financially supported by the National Natural Science Foundation of China(Grant No.52175087) 

主　　题：phononic crystals line-defect fault signal extraction acoustic enhancement 

摘      要：Rotating machine fault signal extraction becomes increasingly important in practical engineering ***,fault signals with low signal-to-noise ratios(SNRs)are difficult to extract,especially at the early stage of fault *** this paper,2D line-defect phononic crystals(PCs)consisting of periodic acrylic tubes with slit are proposed for weak signal *** defect band,namely,the formed resonance band of line-defect PCs enables the incident acoustic wave at the resonance frequency to be trapped and enhanced at the resonance *** noise can be filtered by the band *** a result,fault signals with high SNRs can be obtained for fault feature *** effectiveness of weak harmonic and periodic impulse signal detection via line-defect PCs are investigated in numerical and experimental *** the numerical and experimental results indicate that line-defect PCs can be well used for extracting weak harmonic and periodic impulse *** work will provide potential for extracting weak signals in many practical engineering applications.