大型复杂曲面类毛坯加工定位的全局优化算法

复杂曲面类毛坯通常没有定位基准。针对以上情况，提出了大型复杂曲面类毛坯加工定位的全局优化算法。算法包含两步：第一步是预定位，通过调整毛坯曲面，使毛坯曲面与理论曲面在辅助平面上的投影获得最大重合度。第二，用模拟退火算法对目标函数进行优化，从而实现了毛坯的精确定位。该技术已经在某水轮机叶片的定位中得到应用。结果表明，该算法不仅收敛速度快，而且优化结果非常理想。

A Global Optimization Algorithm of Localization for Huge Sculpture Surface Blank

Blanks of sculptured surface usually do not exist positioning references. In order to improve the blank positioning, a global optimization algorithm of localization for huge sculpture surface blank is presented. The algorithm included two steps. The first step is prelocation, translate and rotate the blank to get the largest overlap of the projections of theoretical surface and blank on the false plane. The second step is the optimization of objective function by means of simulated annealing algorithm to get the best localization. The technique is applied to the positioning of a hydroelectric turbine blade. Results show that it is effective and the final positioning result is excellent.