scholarly journals A Fast Beamforming Method to Localize an Acoustic Emission Source under Unknown Wave Speed

Materials ◽  
2019 ◽  
Vol 12 (5) ◽  
pp. 735 ◽  
Author(s):  
Junfei Tai ◽  
Tian He ◽  
Qiang Pan ◽  
Dayi Zhang ◽  
Xiaoran Wang
Keyword(s):  
Acoustic Emission ◽  
Large Scale ◽  
Wave Speed ◽  
Online Monitoring ◽  
Propagation Speed ◽  
Emission Source ◽  
Test Results ◽  
Acoustic Emission Source ◽  
Pencil Lead ◽  
Thin Walled

The beamforming method is capable of localizing the acoustic emission source in a large-scale structure but its accuracy relies strongly on the assumed propagation speed and it is quite time consuming to apply in online monitoring. This paper proposes a fast beamforming method to localize an acoustic emission source in a thin-walled structure with unknown wave speed. Firstly, the Bartlett beamforming method (BBM) is introduced into broadband Lamb wave signal processing to develop an L-shape array-based damage source localization method for a thin-walled structure. Secondly, the fast Bartlett beamforming method (FBBM) is proposed based on the characteristics of BBM. Finally, the pencil-lead break test is carried out to validate the proposed method. The test results show that the FBBM can accurately localize the damage source by any given probable wave speed much more rapidly than traditional delay-and-sum beamforming.

scholarly journals Detecting and Identifying Artificial Acoustic Emission Signals in an Industrial Fatigue Environment

2008 ◽  
Vol 13-14 ◽  
pp. 251-260
Author(s):  
James J. Hensman ◽  
Rhys Pullin ◽  
Mark J. Eaton ◽  
Keith Worden ◽  
Karen M. Holford ◽  
...  
Keyword(s):  
Signal Processing ◽  
Acoustic Emission ◽  
Monitoring System ◽  
Fatigue Fracture ◽  
Large Scale ◽  
Landing Gear ◽  
Emission Source ◽  
Acoustic Emission Source ◽  
Industrial Environments ◽  
Fatigue Fractures

This paper details progress towards the application of a methodology for Acoustic Emission (AE) detection and interpretation for the monitoring of fatigue fractures in large-scale industrial environments. An artificial acoustic emission source, representative of a fatigue fracture was injected into a test of a substantial landing gear component. An AE monitoring system was then used to successfully locate and identify the source using the new signal processing methodology.

Study on Self Judgment of Location Lave Speed of Acoustic Emission on Concrete Members

2014 ◽  
Vol 578-579 ◽  
pp. 1118-1124
Author(s):  
Qing Li ◽  
Qi Yin Shi ◽  
Zhi Yu Jin ◽  
Fan Yang ◽  
Bao Bing Liu
Keyword(s):  
Acoustic Emission ◽  
Computational Complexity ◽  
Wave Speed ◽  
Emission Source ◽  
Vertical Coordinate ◽  
Source Characteristics ◽  
Concrete Members ◽  
Acoustic Emission Source ◽  
Setting Error

The wave speed of acoustic emission in the medium is uncertain, which is influenced by the source characteristics and the relative position between the acoustic emission source and the sensors. Due to this difference, the results of TDOA location method determination of wave speed in advance are very discrete. As to liner location ,the more farther the distance between two acoustic emission source sensor are, the more serious the discrete error are. Any of the two sensors, a location line can be obtained by setting the wave speed as a horizontal coordinate and the location as the vertical coordinate. The horizontal coordinate of location line of the different sensors is the real wave speed of acoustic emission events. This method has lower computational complexity, which can overcome the influence on acoustic emission location which wave speed setting error brings, having some practical value in Engineering.

Acoustic Emission Source Localization in Ring Gears from Wind Turbine Planetary Gearboxes

2019 ◽  
Vol 83 (1) ◽  
pp. 43-52 ◽  
Author(s):  
Felix Leaman ◽  
Steffen Hinderer ◽  
Ralph Baltes ◽  
Elisabeth Clausen ◽  
Brian Rieckhoff ◽  
...  
Keyword(s):  
Acoustic Emission ◽  
Wind Turbine ◽  
Source Localization ◽  
Emission Source ◽  
Acoustic Emission Source

Near-field beamforming analysis for acoustic emission source localization

Ultrasonics ◽  
2012 ◽  
Vol 52 (5) ◽  
pp. 587-592 ◽  
Author(s):  
Tian He ◽  
Qiang Pan ◽  
Yaoguang Liu ◽  
Xiandong Liu ◽  
Dayong Hu
Keyword(s):  
Acoustic Emission ◽  
Source Localization ◽  
Near Field ◽  
Emission Source ◽  
Acoustic Emission Source

Quality Testing of the Chrome Coating Based on Acoustic Emission Technology

2012 ◽  
Vol 253-255 ◽  
pp. 399-402
Author(s):  
Xing Guo Wang
Keyword(s):  
Acoustic Emission ◽  
Assessment Method ◽  
Emission Source ◽  
Uniform Motion ◽  
Emission Testing ◽  
Acoustic Emission Source ◽  
Quality Testing ◽  
Testing Technology ◽  
Chrome Coating ◽  
Acoustic Emission Testing

A assessment method on quality detected system was developed on cylinders inner wall coating through the hydraulic radial expansive load system and acoustic emission testing technology,. Put double probes linear position principle and uniform motion of load system together, and make curved positioning come true based on the technical principle of locating acoustic emission source. The disadvantage was solved that double probes can’t make acoustic emission source planar positioning. The result showed that this system can provide a precise identification and location; it has fast testing velocity and portable device.

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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