A novel transmissibility concept based on wavelet transform for structural damage detection
A novel transmissibility concept based on wavelet transform for structural damage detection
复制标题
一种基于小波变换的结构损伤检测的新型传递性概念
DOI：
10.12989/sss.2013.12.3_4.291
复制
发表时间：
2013-09-01
影响因子：
3.5
通讯作者：
Zhou, Jing
中科院分区：
文献类型：
--
作者：
Fan, Zhe;Feng, Xin;Zhou, Jing
提出了一种基于小波变换的透射率的结构损伤检测方法。该研究的主要目的是开发一种在早期阶段检测轻微损伤的方法。作为一种基于振动的方法，传递率的概念由于其在损伤检测中的优点和有效性而引起了人们的广泛关注。然而，与其他基于振动的方法一样，由于传统傅里叶变换的规律性，基于透射率的方法对轻微的局部损伤不敏感。因此，必须找到强大的信号处理技术来解决这一问题。小波变换能够从被测信号中捕捉细微信息，在损伤检测领域受到了广泛的关注。本文首先提出了一种基于小波变换的传递率概念。采用离群值分析构建了基于小波传递率的损伤检测算法。以典型的六自由度弹簧-质量系统为例，对该方法的可行性进行了数值研究，并与传统的传递率方法进行了对比研究。结果表明，所提出的透射率比传统的透射率更敏感，是一种很有前途的早期结构损伤检测工具。
A novel concept of transmissibility based on a wavelet transform for structural damage detection is presented in this paper. The main objective of the research was the development of a method for detecting slight damage at the incipient stage. As a vibration-based approach, the concept of transmissibility has attracted considerable interest because of its advantages and effectiveness in damage detection. However, like other vibration-based methods, transmissibility-based approaches suffer from insensitivity to slight local damage because of the regularity of the traditional Fourier transform. Therefore, the powerful signal processing techniques must be found to solve this problem. Wavelet transform that is able to capture subtle information in measured signals has received extensive attention in the field of damage detection in recent decades. In this paper, we first propose a novel transmissibility concept based on the wavelet transform. Outlier analysis was adopted to construct a damage detection algorithm with wavelet-based transmissibility. The feasibility of the proposed method was numerically investigated with a typical six-degrees-of-freedom spring-mass system, and comparative investigations were performed with a conventional transmissibility approach. The results demonstrate that the proposed transmissibility is more sensitive than conventional transmissibility, and the former is a promising tool for structural damage detection at the incipient stage.