随着航空航天制造业和高性能飞行器的不断发展,大曲率板壳结构得到了广泛应用。针对由预应力和尺寸位置偏差等因素引起的装配变形问题,利用光纤布拉格光栅(FBG)传感器对板壳结构的曲面重构算法进行研究。建立了波长偏移量与曲率的关系,得到曲面重构算法所需的曲率数据,应用分段拟合算法计算全部测点的坐标增量,从而实现曲线重构。在此基础上,对实测板壳结构曲面进行重构,并将ANSYS仿真曲面测点处的理论数据与实际重构变形曲面测点数据进行对比,结果表明,该算法有效性较高,为板壳结构件的变形预测和修正提供了技术支撑。

With the development of aerospace manufacturing and high-performance aircraft, large-curvature plate-shell structure has been widely used. Aiming at the problem of assembly deformation caused by factors such as prestress and size and position deviation. a fiber Bragg grating sensor is used to study the surface reconstruction algorithm of plate-shell structure. The relationship between wavelength shift and curvature is established, and the curvature data required for the surface reconstruction algorithm is obtained. Segment fitting algorithm is applied to calculate the coordinate increment of all measuring points to realize the curve reconstruction. On this basis, the measured surface of the plate-shell structure is reconstructed, and the theoretical data at the measuring points of the ANSYS simulation surface is compared with the data of the actual reconstructed deformation surface. The results show that the algorithm is highly effective and provides technical support for the deformation prediction and modification of plate-shell structures.