Abstract: For the complex conical shell parts, the traditional trajectory planning algorithm named isometric offset algorithm is difficult to make the trajectory angle unchangeable. Also, the isometric offset algorithm makes a serious impact on the laying area in the actual laying process. In order to overcome this problem, this paper puts forward the complete same-angles algorithm for the 0° and ±45° trajectory planning and the variable-angles algorithm for the 90° trajectory planning. The complete same-angles algorithm not only makes the trajectory angle of the points on the every trajectory constant, but also causes the deviation between the actual placement angle and the designed fiber ply angle. The variable-angles algorithm can ensure that the trajectory has no gaps and no overlapping in the laying progress and every filament has no resend and clipping process except at the beginning or ending of laying progress. And then, the center line of every filament will be generated by the use of the isometric offset algorithm. After the boundary treatment and the calculation of filament number, the special points like the drop points and the resend points will be obtained. What′s more, the terminal path will be obtained by connecting every paths by using SLERP. Besides, the software is developed based on the V5 Automation technology of CATIA and Visual Studio 2015. At last, the algorithm has been successfully used to plan the trajectory of the small aircraft tail by using the software, which proves that the algorithm is reasonable and feasible.

Key words: fiber placement, trajectory planning, conical shell, complete same-angles, variable-angles, interpolation