A Closed-Form Method of Acoustic Emission Source Location for Velocity-Free System Using Complete TDOA Measurements
School of Resources and Safety Engineering, Central South University, Changsha 410083, China
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Sensors 2020, 20(12), 3553; https://doi.org/10.3390/s20123553
Received: 28 April 2020
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Revised: 10 June 2020
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Accepted: 22 June 2020
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Published: 23 June 2020
(This article belongs to the Special Issue Piezoelectric Transducers Based Structural Health Monitoring)
A closed-form method of acoustic emission (AE) source location for a velocity-free system using complete time difference of arrival (TDOA) measurements is proposed in this paper. First, this method established the governing equation of unknown acoustic velocity for each sensor; then, the governing equations of each of the three sensors were transformed into a linear equation, which can form a system of linear equations with the complete TDOA measurements. Third, the least squares solutions of the AE source coordinate and acoustic velocity were separately solved by an orthogonal projection operator. The proposed method was verified by the pencil-lead break experiment, and the results showed that the location accuracy and stability of the proposed method were better than those of traditional methods. Moreover, a simulation test was carried out to investigate the influence of noise scales on the location accuracy, and the results further prove that the proposed method holds higher noise immunity than the traditional methods.
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MDPI and ACS Style
Zhou, Z.; Rui, Y.; Cai, X.; Lan, R.; Cheng, R. A Closed-Form Method of Acoustic Emission Source Location for Velocity-Free System Using Complete TDOA Measurements. Sensors 2020, 20, 3553. https://doi.org/10.3390/s20123553
AMA Style
Zhou Z, Rui Y, Cai X, Lan R, Cheng R. A Closed-Form Method of Acoustic Emission Source Location for Velocity-Free System Using Complete TDOA Measurements. Sensors. 2020; 20(12):3553. https://doi.org/10.3390/s20123553
Chicago/Turabian StyleZhou, Zilong, Yichao Rui, Xin Cai, Riyan Lan, and Ruishan Cheng. 2020. "A Closed-Form Method of Acoustic Emission Source Location for Velocity-Free System Using Complete TDOA Measurements" Sensors 20, no. 12: 3553. https://doi.org/10.3390/s20123553
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