scholarly journals A Closed-Form Method of Acoustic Emission Source Location for Velocity-Free System Using Complete TDOA Measurements

Sensors ◽  
2020 ◽  
Vol 20 (12) ◽  
pp. 3553
Author(s):  
Zilong Zhou ◽  
Yichao Rui ◽  
Xin Cai ◽  
Riyan Lan ◽  
Ruishan Cheng
Keyword(s):  
Acoustic Emission ◽  
Closed Form ◽  
Linear Equations ◽  
Source Location ◽  
Acoustic Velocity ◽  
Simulation Test ◽  
Traditional Methods ◽  
Free System ◽  
Location Accuracy ◽  
Influence Of Noise

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.

scholarly journals A New Closed-Form Solution for Acoustic Emission Source Location in the Presence of Outliers

2018 ◽  
Vol 8 (6) ◽  
pp. 949 ◽  
Author(s):  
Zilong Zhou ◽  
Yichao Rui ◽  
Jing Zhou ◽  
Longjun Dong ◽  
Lianjun Chen ◽  
...  
Keyword(s):  
Acoustic Emission ◽  
Closed Form ◽  
Closed Form Solution ◽  
Source Location ◽  
Form Solution ◽  
Emission Source ◽  
Acoustic Emission Source

scholarly journals A Weighted Linear Least Squares Location Method of an Acoustic Emission Source without Measuring Wave Velocity

Sensors ◽  
2020 ◽  
Vol 20 (11) ◽  
pp. 3191 ◽  
Author(s):  
Zilong Zhou ◽  
Yichao Rui ◽  
Xin Cai ◽  
Ruishan Cheng ◽  
Xueming Du ◽  
...  
Keyword(s):  
Acoustic Emission ◽  
Least Squares ◽  
Wave Velocity ◽  
Linear Equations ◽  
Linear Least Squares ◽  
Governing Equations ◽  
Traditional Methods ◽  
Location Method ◽  
Reference Equation ◽  
The Mean

The location of an acoustic emission (AE) source is crucial for predicting and controlling potential hazards. In this paper, a novel weighted linear least squares location method for AE sources without measuring wave velocity is proposed. First, the governing equations of each sensor are established according to the sensor coordinates and arrival times. Second, a mean reference equation is established by taking the mean of the squared governing equations. Third, the system of linear equations can be obtained based on the mean reference equation, and their residuals are estimated to obtain their weights. Finally, the AE source coordinate is obtained by weighting the linear equations and inserting the parameter constraint. The AE location method is verified by a pencil lead break experiment, and the results show that the locating accuracy of the proposed method is significantly higher than that of traditional methods. Furthermore, the simulation test proves that the proposed method also has a better performance (location accuracy and stability) than the traditional methods under any given scale of arrival errors.

scholarly journals An Analytical Solution for Acoustic Emission Source Location for Known P Wave Velocity System

2014 ◽  
Vol 2014 ◽  
pp. 1-6 ◽  
Author(s):  
Longjun Dong ◽  
Xibing Li ◽  
Gongnan Xie
Keyword(s):  
Acoustic Emission ◽  
Analytical Solution ◽  
Linear Equations ◽  
Three Dimensional ◽  
Source Location ◽  
Emission Source ◽  
P Wave ◽  
Square Roots ◽  
Existence And Multiplicity ◽  
Acoustic Emission Source

This paper presents a three-dimensional analytical solution for acoustic emission source location using time difference of arrival (TDOA) measurements from N receivers, N⩾5. The nonlinear location equations for TDOA are simplified to linear equations, and the direct analytical solution is obtained by solving the linear equations. There are not calculations of square roots in solution equations. The method solved the problems of the existence and multiplicity of solutions induced by the calculations of square roots in existed close-form methods. Simulations are included to study the algorithms' performance and compare with the existing technique.

Acoustic emission source location in composite structure by Voronoi construction using geodesic curve evolution

2009 ◽  
Vol 126 (5) ◽  
pp. 2324-2330 ◽  
Author(s):  
R. Gangadharan ◽  
G. Prasanna ◽  
M. R. Bhat ◽  
C. R. L. Murthy ◽  
S. Gopalakrishnan
Keyword(s):  
Acoustic Emission ◽  
Composite Structure ◽  
Source Location ◽  
Emission Source ◽  
Curve Evolution ◽  
Geodesic Curve ◽  
Acoustic Emission Source
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