We found a match
Your institution may have rights to this item. Sign in to continue.
- Title
A New Algebraic Solution for Acoustic Emission Source Localization without Premeasuring Wave Velocity.
- Authors
Zhou, Zilong; Lan, Riyan; Rui, Yichao; Dong, Longjun; Cai, Xin
- Abstract
The technique of acoustic emission (AE) source localization is critical for studying material failure mechanism and predicting the position of potential hazards. Most existing positioning methods heavily depend on the premeasured wave velocity and are not suitable for complex engineering practices where the wave velocity changes dynamically. To reduce the influence of measurement error of wave velocity on location accuracy, this paper proposes a new algebraic solution for AE source localization without premeasuring wave velocity. In this method, the nonlinear TDOA equations are established and linearized by introducing two intermediate variables. Then, by minimizing the sum of squared residuals of the linear TDOA equations with respect to the AE source coordinate and two intermediate variables separately, the optimal algebraic solution of the AE source coordinate in the least squares sense is obtained. A pencil-lead breaks experiment is performed to validate the positioning effectiveness of the proposed method. The results show that the new method improves the positioning accuracy by more than 40% compared with two pre-existing methods, and the minimum positioning accuracy of the proposed method can reach 1.12 mm. Moreover, simulation tests are conducted to further verify the location performance of the proposed method under different TDOA errors and the number of sensors.
- Subjects
ACOUSTIC localization; ACOUSTIC emission; FRACTURE mechanics; VELOCITY; MEASUREMENT errors; LINEAR equations
- Publication
Sensors (14248220), 2021, Vol 21, Issue 2, p459
- ISSN
1424-8220
- Publication type
Article
- DOI
10.3390/s21020459