The use of time reversal methods with Lamb waves to identify structural damage in a pipeline system

2006 ◽  
Author(s):  
Andrew B. Thien ◽  
Anthony D. Puckett ◽  
Gyuhae Park ◽  
Charles R. Farrar
Keyword(s):  
Time Reversal ◽  
Structural Damage ◽  
Lamb Waves ◽  
Pipeline System ◽  
Use Of Time

scholarly journals Structural damage imaging based on time-reversal theory for focusing of Lamb waves

2010 ◽  
Vol 59 (10) ◽  
pp. 7111
Author(s):  
Zhang Hai-Yan ◽  
Sun Xiu-Li ◽  
Cao Ya-Ping ◽  
Chen Xian-Hua ◽  
Yu Jian-Bo
Keyword(s):  
Time Reversal ◽  
Structural Damage ◽  
Lamb Waves ◽  
Reversal Theory ◽  
Damage Imaging

A Time Reversal Imaging Method without Relying on Transfer Function for Impact and Damage Monitoring of Composite Structures

2013 ◽  
Vol 330 ◽  
pp. 542-548
Author(s):  
Lei Qiu ◽  
Shen Fang Yuan ◽  
Tian Xiang Huang
Keyword(s):  
Transfer Function ◽  
Time Reversal ◽  
Lamb Wave ◽  
Composite Structures ◽  
Structural Damage ◽  
Composite Panel ◽  
Synthesis Process ◽  
Propagation Mechanism ◽  
Imaging Method ◽  
Phase Synthesis

Composite structures adopted in aerospace structures have attracted much interest to structural health monitoring (SHM) for localization of impact and damage positions due to their poor impact resistance properties. Propagation mechanism and frequency dispersion characteristics of Lamb wave signals on composite structures are more complicated than that on simple aluminum plates. Recently, much attention has been paid to the research of time reversal focusing method because this method shows a promising advantage to give a focusing image of the structural damage, improve the signal-to-noise ratio and compensate the dispersion of Lamb wave signals. In this paper, aiming at developing a practical method for on-line localization of impact and damage on aircraft composite structures which can take advantage of time reversal focusing and does not rely on the transfer function, a new phase synthesis based time reversal focusing method is proposed. Impact and damage images are given out directly through time reversal focusing based on phase synthesis process of the signals. A SHM demonstration system is built on a composite panel of an aircraft wing box with many bolt holes and stiffeners using the phase synthesis based time reversal focusing method. The demonstration results show that this method can estimate the positions of impact and damage efficiently with a low sensitivity of velocity errors.

A time reversal damage imaging method for structure health monitoring using Lamb waves

2010 ◽  
Vol 19 (11) ◽  
pp. 114301 ◽  
Author(s):  
Hai-Yan Zhang ◽  
Ya-Ping Cao ◽  
Xiu-Li Sun ◽  
Xian-Hua Chen ◽  
Jian-Bo Yu
Keyword(s):  
Health Monitoring ◽  
Time Reversal ◽  
Lamb Waves ◽  
Imaging Method ◽  
Structure Health Monitoring ◽  
Damage Imaging

Guided Lamb Wave Interrogation of a Curved Composite Plate [0/90] Using the Hilbert-Huang Transform Approach

2008 ◽  
Author(s):  
Byungseok Yoo ◽  
Darryll Pines ◽  
Ashish S. Purekar
Keyword(s):  
Structural Damage ◽  
Lamb Waves ◽  
Damage Index ◽  
Composite Panel ◽  
Progressive Damage ◽  
Damage Growth ◽  
Monitoring Tool ◽  
Hilbert Huang Transform ◽  
Mode Decomposition ◽  
Torque Load

This paper discusses a study of the Hilbert-Huang transform approach as a structural health monitoring tool for a curved composite panel with a [90/0/0/90]sym lay-up sequence. The Hilbert amplitude, phase, and frequency coupled with empirical mode decomposition (EMD) process are defined as the Hilbert-Huang transform (HHT) and used to evaluate structural damage in the curved composite panel as the level of damage increases. Piezoelectric (PZT) sheets are used as an actuator and receivers, akin to the pitch-catch method to excite the guided Lamb waves and to obtain the vibratory response of the curved composite panel. In this paper, a new damage metric using the Hilbert-Huang transformed energy and amplitude in conjunction with the Hilbert-Huang transformed phase are proposed and investigated as a new structural damage index. Results show that these damage metrics are capable of tracking progressive damage growth in the form of loss of torque load.

scholarly journals On the Joint Use of Time Reversal and POPS-OFDM for 5G Systems

2017 ◽  
Author(s):  
Wafa Khrouf ◽  
Zeineb Hraiech ◽  
Fatma Abdelkefi ◽  
Mohamed Siala ◽  
Matthieu Crussiere
Keyword(s):  
Time Reversal ◽  
Use Of Time ◽  
5G Systems
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