Imaging small three-dimensional elastic inclusions by an enhanced multiple signal classification method

2012 ◽  
Vol 132 (4) ◽  
pp. 2420-2426 ◽  
Author(s):  
Rencheng Song ◽  
Xudong Chen ◽  
Yu Zhong
Keyword(s):  
Three Dimensional ◽  
Signal Classification ◽  
Classification Method ◽  
Multiple Signal Classification ◽  
Multiple Signal ◽  
Elastic Inclusions

Impact source localization in plate utilizing multiple signal classification

2012 ◽  
Vol 227 (4) ◽  
pp. 703-713 ◽  
Author(s):  
HongJun Yang ◽  
Young Jun Lee ◽  
Sang Kwon Lee
Keyword(s):  
Time Delay ◽  
Group Velocity ◽  
Source Localization ◽  
Direction Of Arrival ◽  
Signal Classification ◽  
Classification Method ◽  
Multiple Signal Classification ◽  
Multiple Signal ◽  
The Impact ◽  
Time Delay Of Arrival

This article proposed a multiple signal classification method based on array signal processing for impact source localization in a plate. For source localization, the direction of arrival of the wave caused by an impact on a plate and the distance between the impact position and sensor should be estimated. The direction of arrival can be estimated accurately using the multiple signal classification method; the distance can be obtained using the time delay of arrival and the group velocity of the Lamb wave in a plate. The time delay of arrival is experimentally estimated using the continuous wavelet transform for the wave. The group velocity is theoretically obtained based on the elastodynamic theory.

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