利用振型变化进行结构损伤诊断的研究

 以悬臂梁为研究对象,在其上进行损伤模拟。应用有限元程序进行模态分析,模态分析的结果表明第一阶振型改变率对不同位置和程度损伤的敏感性。提出以第一阶振型改变率作为结构损伤识别的标识量。应用神经网络,成功地识别了损伤的位置和程度,指出其可行性。

Structure Damage Diagnosis Based on Analyzing Changes of Vibration Mode

Damages on a cantilever beam are simulated. Vibration mode analysis is by using commercial finite element software, and the analysis shows the sensitivity of the change ratio of the first order mode shape to the locationand severity of structure damages. Hereby, the change ratio of the first order mode shape is presented as the indicator for structure damage detection. A successful identification of the location and severity of a structure damage isachieved by using artificial neural network.