He Jingjing, Zhou Yibin, Guan Xuefei, Zhang Wei, Wang Yanrong, Zhang Weifang
School of Reliability and System Engineering, Beihang University, Beijing 100191, China.
School of Energy and Power Engineering, Beihang University, Beijing 100191, China.
Materials (Basel). 2016 Nov 4;9(11):894. doi: 10.3390/ma9110894.
A general framework for structural fatigue life evaluation under fatigue cyclic loading using limited sensor data is proposed in this paper. First, limited sensor data are measured from various sensors which are preset on the complex structure. Then the strain data at remote spots are used to obtain the strain responses at critical spots by the strain/stress reconstruction method based on empirical mode decomposition (REMD method). All the computations in this paper are directly performed in the time domain. After the local stress responses at critical spots are determined, fatigue life evaluation can be performed for structural health management and risk assessment. Fatigue life evaluation using the reconstructed stresses from remote strain gauge measurement data is also demonstrated with detailed error analysis. Following this, the proposed methodology is demonstrated using a three-dimensional frame structure and a simplified airfoil structure. Finally, several conclusions and future work are drawn based on the proposed study.
本文提出了一种利用有限传感器数据在疲劳循环载荷下进行结构疲劳寿命评估的通用框架。首先，从预设在复杂结构上的各种传感器测量有限的传感器数据。然后，基于经验模态分解的应变/应力重构方法（REMD方法），利用远程测点的应变数据获取关键测点的应变响应。本文所有计算均直接在时域中进行。确定关键测点的局部应力响应后，即可进行结构健康管理和风险评估的疲劳寿命评估。还通过详细的误差分析展示了利用远程应变片测量数据重构应力进行疲劳寿命评估的方法。在此之后，使用三维框架结构和简化翼型结构对所提出的方法进行了演示。最后，基于所提出的研究得出了一些结论和未来工作方向。
