復(fù)合材料板變形分布式光纖感知與控制方法研究
[Abstract]:Fiber Bragg grating (FBG) sensors have many unique advantages such as small size, anti-electromagnetic interference, high sensitivity, easy to build distributed sensor networks and suitable for integration with composite structures, and are widely used in the field of aeronautics and astronautics. Modern aircraft is developing towards multi-function, high maneuverability and high reliability. Intelligent aircraft with self-diagnosis, self-repair and adaptive function has been paid more attention to. Therefore, this paper presents a distributed fiber sensing and control method for bending deformation of composite laminates, which is similar to the wing flexible trailing edge based on neural network pid algorithm. The main work includes the following aspects: first of all, The fabrication methods of composite laminates for embedded fiber Bragg grating sensors, such as curing process of oven and hot pressing tank, laying and extraction of fiber optic sensors, etc. In order to investigate the effect of curing process on the sensing performance of fiber Bragg grating sensors, the variation characteristics of reflectance spectrum and center wavelength offset of fiber Bragg grating sensors in different curing stages of composite laminates were studied. It provides a useful reference for the optimization of the subsequent curing process and the performance evaluation of the sensor. Secondly, based on fiber Bragg grating sensor, the bending deformation monitoring system of single side clamped epoxy resin plate and carbon fiber composite laminated plate is constructed. With the help of the experimental calibration method, the mapping relationship between the bending deformation of the plate structure and the central wavelength offset of the fiber grating sensor array under typical loading conditions is obtained, which provides the basis for the rapid identification of the plate structure deformation. Thirdly, according to the requirements of wing structure deformation control, the pid algorithm based on Hebb single neuron BP neural network and RBF neural network control is presented based on the traditional pid algorithm. Numerical simulation shows that the neural network pid control algorithm can improve the performance of deformation control such as overshoot and adjusting time. Finally, the distributed optical fiber monitoring and control system of composite laminates deformation based on BP neural network pid algorithm is constructed, and the software of sensing and controlling the bending deformation of composite laminates based on LabVIEW is developed. The control of bending deformation state of plate structure is realized.
【學(xué)位授予單位】:南京航空航天大學(xué)
【學(xué)位級(jí)別】:碩士
【學(xué)位授予年份】:2016
【分類號(hào)】:TB33;TP212
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