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A novel linear-correction localization method of acoustic emission source for velocity-free system
Zilong Zhou1, Yichao Rui1, Xin Cai1
1School of Resources and Safety Engineering, Central South University, Changsha 410083, China.
Ultrasonics
|May 15, 2021
Summary
A new acoustic emission (AE) source localization method improves noise immunity for time-difference-of-arrival (TDOA) measurements. This velocity-free technique enhances accuracy and stability, even with wave velocity errors.
Area of Science:
- Materials Science
- Mechanical Engineering
- Signal Processing
Background:
- Acoustic emission (AE) source localization is crucial for structural health monitoring.
- Traditional methods struggle with noise in time-difference-of-arrival (TDOA) measurements and wave velocity errors.
- Improving localization accuracy and stability in velocity-free systems is a key challenge.
Purpose of the Study:
- To propose a novel linear-correction localization method for acoustic emission (AE) sources.
- To enhance noise immunity in time-difference-of-arrival (TDOA) measurements.
- To reduce the impact of wave velocity measurement errors on localization accuracy in velocity-free systems.
Main Methods:
- Constructing linear equations with intermediate variables to solve for unconstrained least squares (LS).
- Estimating equation residuals to obtain a weight matrix.
- Imposing the weight matrix and quadratic constraint on the LS estimate for a constrained weighted least squares (CWLS) criterion.
- Minimizing the CWLS criterion using linear correction for optimal estimation.
Main Results:
- Experimental verification using pencil-lead breaks demonstrates superior locating accuracy and stability compared to traditional methods.
- Simulation tests confirm optimal positioning performance.
- The method achieves Cramér-Rao lower bound (CRLB) under various TDOA noise powers.
Conclusions:
- The proposed linear-correction method offers enhanced noise immunity and accuracy for AE source localization.
- It effectively addresses challenges related to TDOA measurements and wave velocity errors in velocity-free systems.
- The method demonstrates robust performance, reaching theoretical limits in positioning accuracy.
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