New approaches for automatic threedimensional source localization of acoustic emissions - Applications to concrete specimens

作     者：Kurz, Jochen H. 

作者机构：Fraunhofer Inst Nondestuct Testing IZFP D-66123 Saarbrucken Germany 

出 版 物：《ULTRASONICS》 (超声学)

年 卷 期：2015年第63卷

页      面：155-162页

核心收录：

学科分类：07[理学] 082403[工学-水声工程] 08[工学] 070206[理学-声学] 0824[工学-船舶与海洋工程] 1009[医学-特种医学] 0702[理学-物理学] 

基　　金：Deutsche Forschungsgemeinschaft [SFB 381] 

主　　题：Acoustic emission Localization algorithm Direct solver Iterative solver Concrete 

摘      要：The task of locating a source in space by measuring travel time differences of elastic or electromagnetic waves from the source to several sensors is evident in varying fields. The new concepts of automatic acoustic emission localization presented in this article are based on developments from geodesy and seismology. A detailed description of source location determination in space is given with the focus on acoustic emission data from concrete specimens. Direct and iterative solvers are compared. A concept based on direct solvers from geodesy extended by a statistical approach is described which allows a stable source location determination even for partly erroneous onset times. The developed approach is validated with acoustic emission data from a large specimen leading to travel paths up to 1 m and therefore to noisy data with errors in the determined onsets. The adaption of the algorithms from geodesy to the localization procedure of sources of elastic waves offers new possibilities concerning stability, automation and performance of localization results. Fracture processes can be assessed more accurately. (C) 2015 Elsevier B.V. All rights reserved.