Gantry Crane Structural Modeling And Combinatorial Optimization Method And Cad System Development,

The modeling of optimized design and the trend of CAD development and application are elaborated, in addition, the disadvantage and flaw in metal structure design and optimized design of gantry crane presented in this thesis .Because of plentiful constrains in optimized design, feasible region of optimum variable goes complicated. However, optimum solution often lies in the boundary of feasible region, which results in traditional methods can not find the global optimum solution. The disadvantage and flaw of traditional methods cause the low efficiency of optimized design of gantry crane structure. It is necessary to adopt a new reliable and stable optimized design method to build gantry CAD system from the consideration of low portability of traditional methods. Gantry CAD system will shorten the design circle, lower production cost, enhance competitive strength and extend the capacity for technological innovation of enterprises.Optimization of the traditional method has some limitations, such as the need gradient information, convex planning, single-issue, and so on. In the field of practical applications, there is a variety of highly complex optimization problems. To solve such complex optimization problems with the traditional method is difficult, so people have been struggling to find efficient, more robust global optimization technology to deal with such issues for many years. Aiming at most of global search optimization arithmetic which has global search optimization ability,but can not ensure to get the global search optimization in multiple maximum function,a new kind of compound optimization strategy by multithread and object-oriented method based on Mixed Discrete Optimization Design, Genetic Algorithm, Girding Method and Penalty Function Method is put forward in this paper. The strategy,combined with Mixed Discrete Optimization Design, Genetic Algorithm, Girding Method and Penalty Function Method,makes full use of the simple and local search stability of Penalty Function Method and the overall stability of Genetic Algorithm for collaborative optimization. Because the new compound strategy has the optimization mechanism of strengthening their merit and reducing their defect, it can get better efficiency and excellent result.Mathematical model and computer model of gantry crane are completed based on Visual C++6.0 in accordance with optimized design of metal structure. Eight variables of main beam and support are fixed by taking the lightest weight of gantry crane as objective function, and then forty constraint functions hence fixed in the process of optimized design. Compared the result of using Combined Optimization Strategy with Penalty Function Method and Girding Method respectively in Gantry crane frame optimization, the Combined Optimization Strategy can reduce the manufacturing cost of Gantry crane, raise the performance and economic efficiency of Gantry crane and reduce energy and steel consumption. Providing the industry a modern design means, it can guide product design and development, and improve the crane design quality, speed and level of pricing and product competitiveness.