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面向航空航天器关键板状结构形态变化主动监测研究领域,以一种表面正交网状粘贴电阻应变片的柔性悬臂板结构为实验模型,提出了一种基于二维曲率数据的空间曲面形态重构算法.首先,基于分布式应变片网络检测结构表面双向正交应变信息,并将结构测点应变信息转化为曲率数据;其次,在板面建立由空间曲线阵列组成的正交曲线网,在正交曲线网上建立运动坐标系;然后,利用给定的边界条件和节点曲率信息计算节点坐标,同时利用两个正交曲率的耦合关系,对正交两个方向坐标系进行坐标变换,实现节点坐标的递推运算;最后,构建了实验模型结构和可视化实验平台,并进行实验验证与算法比较分析.实验结果表明,本文所提形态重构算法有效可行,不仅可精确实现结构纯弯形态重构,同时对扭转形态具有优良的重构效果.
In the field of proactive monitoring of the morphological changes of the key plate-like structures of aerospace vehicles, a flexible cantilever plate structure with resistive strain gauges with orthogonally crossed surfaces is presented as an experimental model. The method is based on the distributed strain gauge network to detect the bi-directional orthogonal strain information on the surface of the structure and transform the strain information of the structure measurement point to the curvature data. Secondly, an orthogonal curvilinear network composed of space curve array is established on the surface of the plate. Then, using the given boundary conditions and the curvature information of the nodes, the coordinates of the nodes are calculated. At the same time, by using the coupling relation between two orthogonal curvatures, the coordinates of the two orthogonal directions are transformed and the nodes Finally, the experimental model structure and visualization experimental platform are constructed, and the experimental verification and algorithm comparison are carried out.The experimental results show that the proposed algorithm is effective and feasible, At the same time, it has an excellent reconstruction effect on the twisted shape.