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National Repository of Grey Literature

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Localization and Identification of AE Sources by the Help of Time Reversal Mirrors Převorovský, Zdeněk ; Krofta, Josef ; Chlada, Milan ; Farová, Zuzana In this paper we suggest new concepts of more precise acoustic emission (AE) source localization and identification in komplex structures. The method is based on a Time Reversal (TR) AE signal processing. The new offline procedure, called TRAED (Time Reversal AE Deconvolution), is relativem simple and does not require any knowledge on the structure material and geometry. Detailed record

Structural Health Monitoring in aerospace and civil engineering supported with two ultrasonic NDT methods - AE and NEWS Převorovský, Zdeněk ; Krofta, Josef ; Farová, Zuzana ; Chlada, Milan Structural Health Monitoring (SHM) becomes today an important technology improving reliability and safety of aeronautical and civil structures. Combining of two ultrasonic NDT methods - Acoustic Emission (AE) with Nonlinear Elastic Wave Spectroscopy (NEWS) - in SHM systems brings many advantages. AE enables real-time detection and localization of initiation and progression under operational stimulations, and NEWS methods provide retrieval of structural faults and complete information on AE sources. Examples of a complex SHM system design for critical parts of both aircraft and building roofs are discussed in this paper. The NEWS pseudo-tomography procedure, based on Time Reversal Mirrors (TRM) with Excitation Symmetry Analysis Method (ESAM), enabled zone-location of initiating defects, not detectable by other classical NDT procedures.Our results reflect good robustness of both techniques, and support their helpfulness in SHM of aircraft and building structures. Detailed record

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