Rotating machine fault signal extraction becomes increasingly important in practical engineering applica-tions.However,fault signals with low signal-to-noise ratios(SNRs)are difficult to extract,especially at the early stage of fault diagnosis.In this paper,2D line-defect phononic crystals(PCs)consisting of periodic acrylic tubes with slit are proposed for weak signal detection.The 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 cavity.The noise can be filtered by the band gap.As a result,fault signals with high SNRs can be obtained for fault feature extraction.The effectiveness of weak harmonic and periodic impulse signal detection via line-defect PCs are investigated in numerical and experimental studies.All the numerical and experimental results indicate that line-defect PCs can be well used for extracting weak harmonic and periodic impulse signals.This work will provide potential for extracting weak signals in many practical engineering applications.

Tinggui CHEN;Bo WU;Dejie YU

State Key Laboratory of Advanced Design and Manufacturing for Vehicle Body,College of Mechanical and Vehicle Engineering,Hunan University,Changsha 410082,China

机械工程前沿

[1]Tinggui CHEN;Bo WU;Dejie YU-.Acoustic fault signal extraction via the line-defect phononic crystals)[J].机械工程前沿,2022(01):143-153

Acoustic,fault,extraction,via,line,defect,phononic,crystals,Rotating,machine,becomes,increasingly,important,practical,engineering,However,signals,low,noise,ratios,SNRs,are,difficult,especially,early,stage,diagnosis,In,this,paper,2D,PCs,consisting,periodic,acrylic,tubes,slit,proposed,weak,detection,band,namely,formed,resonance,enables,incident,acoustic,wave,frequency,trapped,enhanced,cavity,can,filtered,by,gap,high,obtained,feature,effectiveness,harmonic,impulse,investigated,numerical,experimental,studies,All,results,indicate,that,well,used,extracting,This,work,will,provide,potential,many,applications

0.496455