Linear positioning for modal acoustic emission source based on micronano-fiber coupled sensors

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Journal of Vibration and Shock ›› 2019, Vol. 38 ›› Issue (1) : 79-88.

FU Wencheng,LIU Yiying,WANG linjie,LI Fengmei

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Abstract

Due to their strong anti-electromagnetic interference ability, being easy to make, and low demodulation cost, micronano-fiber coupled sensors (MFCSs) have a good application prospect in the field of acoustic emission.However, their application in modal acoustic emission source positioning is not reported.Here, linear positioning for modal acoustic emission source was realized based on the S0/A0 peak value positioning method and the A0/A0 threshold one using MFCS.The influence law of Gabor transform’s time resolution on the accuracy of modal recognition in the S0/A0 positioning method and that of isopleth threshold in the A0/A0 positioning method on the positioning results were analyzed.The positioning accuracy, positioning range and positioning repeatability of two methods were compared and discussed.This study provided a guide for practical application of micronano-fiber coupled sensors in modal acoustic emission sources’ linear positioning.

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Micro-fiber coupler sensors / modal acoustic emission / dispersion characteristics / liner location

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FU Wencheng,LIU Yiying,WANG linjie,LI Fengmei . Linear positioning for modal acoustic emission source based on micronano-fiber coupled sensors[J]. Journal of Vibration and Shock, 2019, 38(1): 79-88

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