Overhead Crane Bridge Lightweight Design Based On Differential Evolution

With the rapid development of the bridge crane market, the technology of foreign products has been relatively mature at the present, they use the new kind of design concept and has formed a series, modular and lightweight product system. But most of the domestic production enterprises are still using the traditional analog design methods and most of the products technical solutions still learn from the QD series of1980s design ideas. There is a wide gap between the overseas and domestic corporations in the application of new design concept and development of new products.The weight of the bridge is accounted for60%-70%of the machine’s, the bridge is the main force components when the crane work and its structural performance plays a decisive role for the use of machine performance. Therefore, under the premise of ensuring the crane bridge performance, minimizing the bridge’s weight is the focus of this article. The content of this study focus on the following aspects:(1) Studied to determine the structure form of the new lightweight overhead crane’s main girder, end girder and their connection. Being based on the original QD series of bridge design method, to establish the mathematical optimization model of the main girder and end girder.(2) Considered the stability of the structure, studied the force of main girder’s several key parts, to establish the mathematical optimization model of the main girder stiffeners.(3) With Matlab as a platform, used differential evolution works out the design process of overhead crane bridge to provide technical support for the development of bridge design system. With main girder as an example, the Bias-rail box main girder design system is developed.This paper selects five typical types of overhead crane as examples to optimize the design of the main girder by Bias-rail box main girder design system. The design results verify the feasibility which differential evolution is used in bridge design, through the optimization design, the weight of main girder achieves the desired weight loss. This system can effectively avoid human error in the traditional design, reduce the repetitive work of designers, improve the design quality and shorten the product development cycle.