在基于非线性系统的频域分析方法的束结构中检测损坏
Wenbo Zhang1, Xiaoyue Guo2, Liangliang Cheng1
1Dynamics and Vibration Group, Engineering and Technology Institute Groningen, Faculty of Science and Engineering, University of Groningen, 9747 AG Groningen, The Netherlands.
Sensors (Basel, Switzerland)
|May 14, 2025
概括
本研究引入了一种使用非线性系统分析检测早期结构损伤的新方法. 这种先进的技术准确地识别了复杂系统中的损伤,优于传统方法.
科学领域:
- 结构健康监测 结构健康监测
- 非线性系统动态 非线性系统动态
- 工程机械 工程机械 工程机械
背景情况:
- 使用线性频率响应函数 (FRF) 的传统结构损伤检测方法对于早期损伤是不够的.
- 非线性输出频率响应函数 (NOFRF) 为分析非线性系统提供了一个有前途的扩展.
研究的目的:
- 将基于NOFRF的损坏检测扩展到多度自由度 (MDOF) 系统和梁结构.
- 为了解决在MDOF系统中识别非线性特征频率的复杂性.
- 开发一种可靠的方法,以在噪声存在时准确检测结构损坏.
主要方法:
- 提出了一种多输入多输出前向回归直角最小平方 (MFROLS) 算法,用于识别具有异源输入 (NARX) 的非线性自动回归模型.
- 在1D MDOF系统上使用NARX和通用关联线性方程 (GALEs) 方法进行了数值模拟.
- 在不同损坏级别的简单支梁上进行实验验证.
主要成果:
- 拟议的MFROLS-NARX-GALEs方法成功地捕获了模拟损坏的MDOF系统的动态特征变化,优于最小平方方法 (LSM).
- 实验结果证实了非线性频域分析能够在光束结构中区分损伤水平的能力.
结论:
- 开发的非线性频域分析方法为复杂工程系统中的结构损伤检测提供了一种新且有效的方法.
- 这项研究提高了检测早期和微妙结构损伤的能力,改善了安全性和耐久性评估.
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