摘要
提出利用测量位置处光栅传感器的光谱特征反推该处对应的应变分布状态的方法。采用改进的传递矩阵方法,模拟了不同应变分布函数对应的光谱响应,分析了其基本特征参数同应变分布之间的变化规律。通过有限元仿真计算试验件在弯曲载荷下光栅粘贴处的应变分布,重构了传感器的光谱,并将其和应变分布函数的理论计算光谱图进行比较,验证了应变分布形式与反射光谱特征的关联性。构建带有不同半径圆孔的铝合金板孔口弯曲加载试验系统,测试试验件弯曲挠度和孔径大小与反射谱特性的关系。理论及试验结果表明,实测与仿真计算的谱图变化具有相同规律,光谱特征参数可作为预测铝合金孔径的有效指标,并为其他类型结构的应变场变化规律的监测提供参考依据。
An inverse method is introduced to estimate the strain distribution by using the reflection spectra characteristics measured from the grating sensor.The improved transfer matrix method is used to simulate the spectral response of various strain distribution functions,and the variations between the spectrum shapes and the strain distributions are analyzed.The finite element method is used to calculate the strain fields of the specimens subjected to static bending loads,then the spectrum of the sensor is reconstructed.Furthermore,the correlation between the strain distribution and the form of the spectrum is verified by comparing it with that obtained by numerical simulation with the strain distribution function.In addition,a flexure test system for aluminum alloy plates with different radii holes is constructed to test the relationship among bending deflection,hole radius and the reflection spectrum characteristics.From theoretical calculation and experimental results,the measured spectra are found to reproduce the change in the simulation results very well,and the spectral feature parameters are proposed as effective indicators for the quantitative evaluation of the hole size,which has a potential to be applied to other configurations.
作者
高超干
白瑜芳
梁大开
周储伟
GAO Chaogan;BAI Yufang;LIANG Dakai;ZHOU Chuwei(State Key Laboratory of Mechanics and Control of Mechanical Structures,Nanjing University of Aeronautics&Astronautics,Nanjing,210016,China)
出处
《南京航空航天大学学报》
EI
CAS
CSCD
北大核心
2020年第5期800-807,共8页
Journal of Nanjing University of Aeronautics & Astronautics
基金
国家自然科学基金(11872205)资助项目
江苏省高校优势学科建设工程资助项目。
关键词
光谱响应分析
非均匀应变分布
有限元方法
光谱特征
挠度⁃比强度斜率
spectral response analysis
non⁃uniform strain distribution
finite element method
spectral feature
slope of deflection/intensity ratio
