基于结构设计的自调节铺放轨迹规划算法

通过分析预浸带/纱在曲面上的铺放工艺性,提出以轨迹测地曲率作为铺放工艺性测度,构建一种基于结构设计的自调节轨迹规划算法,兼顾自动铺放中的铺放工艺性和结构设计要求.该算法是在满足结构设计的前提下,将预浸带/纱轨迹从结构设计所确定的方向按特定方式向测地线方向偏转,从而减小预浸带/纱的变形.本文以固定角度法作为结构设计准则、以最大容许偏转角法定义修正函数,以此为例阐述具体算法及实施过程.基于Visual C++平台,进行C++和SQL混合编程,以某型进气道为模型进行了算法仿真,并进行了进气道和锥壳的铺放试验.结果表明:容许偏转角的增大有助于缓解预浸带/纱的变形.

Adjustment Algorithm Based on Structural Design for Automated Tape Laying and Automated Fiber Placement

By analyzing the placeable characteristic of prepreg tapes/tows on curved surfaces, the geodesic curvature of the trajectory is taken as the evaluation parameter of the processing characteristic of prepreg tapes/tows. An adjustment algorithm is proposed based on structural design for Automated Tape Laying (ATL) and Automated Fiber Placement (AFP), in order to strike a balance between the requirements of the placing process and structural design. On the premise of meeting the structural design demand, the novel algorithm diverts the placement direction from the original one (which is generated according to structural design) to the adjusted one (which is closer to the geodesic direction) in a specific way, aiming at releasing the strains in prepreg tapes/tows. In this paper, the algorithm is described in detail for the case when the structure is designed in the fixed fiber orientation method and the diversion follows the rule of maximum deflection angle. In addition, the algorithm is programmed in Visual C++ and SQL language by C++. Through the verification on an aeroplane inlet model and the experiments on the inlet and the cone structure, it is demonstrated that increasing the deflection angle can relieve the deformation of the prepereg tapes/tows.