Model-based method with nonlinear ultrasonic system identification for mechanical structural health assessment
Model-based method with nonlinear ultrasonic system identification for mechanical structural health assessment
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DOI：
10.1002/ett.3955
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发表时间：
2020-03-31
影响因子：
3.6
通讯作者：
Huang, Jinmin
中科院分区：
文献类型：
--
作者：
Chen, Hanxin;Huang, Lang;Huang, Jinmin
传统的结构无损检测（NDT）方法，如脉冲涡流（PEC）、超声检测（UT）等，都是基于无损检测系统输出信号的解释技术，提取特征来评估结构的健康状况。本文提出了一种新的无损检测方法，从不同的角度进行结构健康监测，这是基于结构系统模型之间的激励输入和输出响应。采用带外生输入的非线性自回归滑动平均（NARMAX）建立输入信号与输出响应之间的时域模型。提出了从时域数据中提取NARMAX模型的频率响应，得到结构健康评估指标的方法。通过两组实验数据与现有方法的对比，验证了该方法的有效性和优越性。
Conventional methods for the structural nondestructive testing (NDT) such as pulsed eddy current (PEC), ultrasonic detection (UT), and so on are based on the output signal interpretation technique of the NDT system to extract the features to assess the structural health. In this article, a novel NDT method for the structural health monitoring from the different perspective is proposed, which is based on the structural system model between the exciting input and output response. Nonlinear autoregressive moving average with exogenous inputs (NARMAX) is used to establish the time domain model between the input signal and the output response. Frequency response (FRF) of NARMAX model from the time domain data is proposed to obtain the indicators to assess the structural health. The effectiveness and advantage of the proposed method are tested with two sets of experimental data by comparison with the existing method.