Research On Developing Method For Complex Hull Surface

The technique of complex surfaces expanding has been a hotspot and nodus in the filed of shipbuilding, aircraft and automobile designing and manufacturing. On the one hand, the traditional expanding approach has been unable to meet the required precision of ship manufacturing and processing; On the other hand, the complex surfaces flattening provide the necessary parameters for steel plates processing, which is an important basis for steel automatic processing. Therefore, the accurate technique of hull surfaces flattening can significantly improve the efficiency and accuracy in its manufacturing process, and it has a positive role in improving the competitiveness of China's shipbuilding industry.This paper presents an algorithm of hull surfaces expanding based on differential evolution algorithm. Complex hull surfaces are flattened after finishing its expression with Non-uniform B-spline. In this process, the issue of surfaces expanding boils down to the problem of global optimal solution. This method not only solves the problem of complex surfaces expending, but also lays a foundation for the subsequent processing and forming of steel plates. A differential evolution algorithm is used in solving the optimal equation. Compared with the traditional genetic algorithm, this algorithm has a faster shrinking speed, less adjustable parameters, better robustness and it can more steady converge to the question of the global optimal solution.This paper develops a module named " Approximately Flattening System for Complex Hull Surfaces" based on Windows XP and Auto CAD and with the help of Visual Basic, thus realizing these functions such as expression of complex surfaces, automatic draw of surfaces, unfolding and calculating, export of data and analysis of error.