Chapter 40
Localization of Acoustic Emission
Sources in the Steel Bifurcated Pipe
of Hydropower Station
Weiping Wu, Zhejun Liu, Shulin Cao, Donfeng Li, and Zhen Huo
Abstract The paper analyzes and studies the acoustic emission localization of the
irregular-shaped and thick-wall steel plate bifurcated pipe of hydropower station.
The paper analyzes the effect of acoustic velocity and structural irregularity on
localization accuracy of AE source. On the basic of time–frequency analysis of the
AE signals, drawing of the Lamb wave dispersion curves, calculation of the group
velocity and the phase velocity of the Lamb wave, meanwhile, considering the characteristics of multi-mode and variable velocity of the wave, the paper proposes a
method to measure the sound velocity based on linear fitting of TDOA (time difference of arrival) versus distance difference of respective source distances from the
two sensors. The Location Uncertainty (LUCY) and location error (LE) analysis of
AE location source are also implemented. At the end the proposed velocities of the
different area of the steel bifurcated pipe are calculated.
40.1 Introduction
The location of time difference of arrival (TDOA) in acoustic emission detection is
based on the measurement of the TDOA, sound velocity, sensor position and other
parameters, as well as the complicated geometric calculation in the sensors array,
therefore, the parameters mentioned above will affect the accuracy of AE sources
location. It is usually assumed that the material is isotropic, the sound velocity in the
material is constant and the path of propagation between the source and the sensor is
straight, in location of TDOA. Linear location (one-dimensional location) and plane
W. Wu (B) · S. Cao · D. Li
National Center of Quality Inspection and Testing for Hydraulic Metal Structure Ministry of
Water Resources, Zhengzhou 450044, China
e-mail: wp.wu@163.com
Z. Liu
Aerospace Research Institute of Materials & Processing Technology, Beijing 100076, China
Z. Huo
Wuhan Boiler and Pressure Vessel Inspection Institute, Wuhan 430040, China
© The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd. 2021
G. Shen et al. (eds.), Advances in Acoustic Emission Technology, Springer Proceedings
in Physics 259, https://doi.org/10.1007/978-981-15-9837-1_40
449
Localization of Acoustic Emission
Sources in the Steel Bifurcated Pipe
of Hydropower Station
Weiping Wu, Zhejun Liu, Shulin Cao, Donfeng Li, and Zhen Huo
Abstract The paper analyzes and studies the acoustic emission localization of the
irregular-shaped and thick-wall steel plate bifurcated pipe of hydropower station.
The paper analyzes the effect of acoustic velocity and structural irregularity on
localization accuracy of AE source. On the basic of time–frequency analysis of the
AE signals, drawing of the Lamb wave dispersion curves, calculation of the group
velocity and the phase velocity of the Lamb wave, meanwhile, considering the characteristics of multi-mode and variable velocity of the wave, the paper proposes a
method to measure the sound velocity based on linear fitting of TDOA (time difference of arrival) versus distance difference of respective source distances from the
two sensors. The Location Uncertainty (LUCY) and location error (LE) analysis of
AE location source are also implemented. At the end the proposed velocities of the
different area of the steel bifurcated pipe are calculated.
40.1 Introduction
The location of time difference of arrival (TDOA) in acoustic emission detection is
based on the measurement of the TDOA, sound velocity, sensor position and other
parameters, as well as the complicated geometric calculation in the sensors array,
therefore, the parameters mentioned above will affect the accuracy of AE sources
location. It is usually assumed that the material is isotropic, the sound velocity in the
material is constant and the path of propagation between the source and the sensor is
straight, in location of TDOA. Linear location (one-dimensional location) and plane
W. Wu (B) · S. Cao · D. Li
National Center of Quality Inspection and Testing for Hydraulic Metal Structure Ministry of
Water Resources, Zhengzhou 450044, China
e-mail: wp.wu@163.com
Z. Liu
Aerospace Research Institute of Materials & Processing Technology, Beijing 100076, China
Z. Huo
Wuhan Boiler and Pressure Vessel Inspection Institute, Wuhan 430040, China
© The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd. 2021
G. Shen et al. (eds.), Advances in Acoustic Emission Technology, Springer Proceedings
in Physics 259, https://doi.org/10.1007/978-981-15-9837-1_40
449