基于光纤布拉格光栅的飞机装配应变检测

Aircraft assembly strain detection based on Fiber Bragg Grating

摘要:

飞机装配是航空制造中相当重要的一个环节,其工作量大,装配周期长,在很大程度上决定了飞机的整体质量。针对在装配过程中,由于操作及工艺等方面的原因从而使得装配体产生局部应变影响飞机稳定工作的问题。提出了一种基于光纤布拉格光栅(Fiber Bragg grating ,FBG)的飞机装配应变检测方法,对FBG进行封装标定,标定灵敏度为0.35 pm/με ,拟合方程线性度高于0.99；将封装后的FBG布设于装配体关键部位,利用FBG解调系统得出其中心波长在装配过程中的变化；设计了一种基于集合经验模态分解(Ensemble Empirical Mode Decomposition, EEMD)与奇异谱分析(Singular Spectrum Analysis, SSA)的改进算法,对装配信号中的噪声与振动信号进行剥除,提取有效的应变信号,最终实现了飞机装配中局部应变的检测。

Abstract:

Aircraft assembly is a very important link in aviation manufacturing. Its heavy workload and long assembly cycle determine the overall quality of aircraft to a large extent. In order to solve the problem that the local strain affects the stable operation of aircraft due to the operation and process in the assembly process. An aircraft assembly strain detection method based on Fiber Bragg grating (FBG) was proposed. The calibration sensitivity of FBG was 0.35pm/με , and the linearity of fitting equation was higher than 0.99. The packaged FBG was arranged in the key parts of the assembly, and the change of its central wavelength in the assembly process was obtained by FBG demodulation system. An improved algorithm based on Ensemble Empirical Mode Decomposition (EEMD) and Singular Spectrum Analysis (SSA) is designed. The noise and vibration signals in the assembly signal are stripped, and the effective strain signal is extracted, and the local strain detection in aircraft assembly is finally realized.