Kocur Georg Karl, Saenger Erik H, Grosse Christian U, Vogel Thomas
Institute of Structural Engineering, ETH Zurich, Stefano-Franscini-Platz 5, 8093 Zurich, Switzerland; Research-Development-Engineering, Halfen GmbH, Liebigstrasse 14, 40746 Langenfeld, Germany.
International Geothermal Centre Bochum, Lennershofstrasse 140, 44801 Bochum, Germany.
Ultrasonics. 2016 Feb;65:96-104. doi: 10.1016/j.ultras.2015.10.014. Epub 2015 Oct 19.
The time reverse modeling (TRM) is applied for signal-based acoustic emission (AE) analysis of reinforced concrete (RC) specimens. TRM uses signals obtained from physical experiments as input. The signals are re-emitted numerically into a structure in a time-reversed manner, where the wavefronts interfere and appear as dominant concentrations of energy at the origin of the AE. The experimental and numerical results presented for selected AE signals confirm that TRM is capable of localizing AE activity in RC caused by concrete cracking. The accuracy of the TRM results is corroborated by three-dimensional crack distributions obtained from X-ray computed tomography images.
时间反转建模（TRM）被应用于钢筋混凝土（RC）试件基于信号的声发射（AE）分析。TRM使用从物理实验获得的信号作为输入。这些信号以时间反转的方式在数值上重新发射到结构中，在那里波前相互干涉，并在声发射源处表现为主要的能量集中。针对选定声发射信号给出的实验和数值结果证实，TRM能够定位由混凝土开裂引起的钢筋混凝土中的声发射活动。从X射线计算机断层扫描图像获得的三维裂缝分布证实了TRM结果的准确性。
