瞬态波在非均匀损伤混凝土介质中的传播与反演

Propagation and Inversion of Transient Wave in Inhomogeneous Damaged Concrete Media

研究瞬态波在非均匀介质中的传播,根据波的响应反演介质的损伤。首先将连续的非均匀损伤介质区域分层处理成均匀损伤区域,利用波谱系数传递矩阵和快速傅里叶变换,对瞬态波在2种典型损伤度模型中的传播进行了实例计算,得到了相关的声学参数,然后在此基础上结合用Newton迭代法、Tikhonov正则化以及L曲线准则得到了与真实损伤度较为吻合的反演结果。

Propagation of transient wave in inhomogeneous media is investigated. According to wave response, the medium damage is inversed. The continuous inhomogeneous damaged concrete media is approximately treated as stratiform homogeneous damaged region. Using spectra transfer matrix and FFT, transient wave propagation in inhomogeneous media of two typical damaged models are calculated. The related acoustic parameters is obtained, and then based on them and combined with Newton-iterative method, regularization method and L curve criterion, inversion results quite coincident with the real distribution are accordingly obtained.