Bridge Crane Mrane Multi-objective Optimization Design Based On Ansys

In recent years, the bridge crane becomes more and more important in industrial production. At present the domestic bridge crane structure design is mostly based on the traditional experience method and static performance design, the structure design level is not high, it makes some bridge crane structures exist quality problems, poor dynamic performance and other problems. Aiming at these problems, this article based on finite element analysis theory, introduces the modern method of structural optimization design into the structure designing of bridge crane, to satisfy the structural strength, rigidity and stability constraints, in order to achieve the purpose of the structure of the bridge crane dynamic performance excellently and structure light weight. The main research contents are as follows:(1) Using the methods with the APDL language and Command flow set up a bridge crane structure finite element model, combined with bridge crane of the actual working condition, and made a detailed analysis with its calculating load and calculation condition, carries out the static analysis based on this, and use the analysis results as constraint conditions of multi-objective optimization problem Considering the influence of dynamic rigidity for the bridge type crane structure dynamic performance, carries out the dynamic analysis to the model (modal analysis and harmonic response analysis), finally use the analysis results as an objective function of multi-objective optimization problem.(2) According to the results of analysis, making the most light quality of the bridge crane metal structure, the largest fifth order natural frequency as the optimization target, establishing a bridge crane multi-objective dynamic optimization model. And making some improvements to the NSGA-Ⅱ algorithm, creating initial populations by using the uniform design, and introducing the arithmetic crossover operator, finally solving the multi-objective optimization based on this method. Finally this paper puts forward integrating the improved optimization algorithm through matlab and ANSYS finite element analysis by using the SIGHT. Using NSGA-II algorithm and improved algorithm to bridge crane structure of multi-objective optimization, Through the contrast optimization results show the improved algorithm’s effectiveness and superiority, and finally selecting a set of comprehensive performance comparison optimal design scheme.(3) At last, in order to verify the correctness of the optimization results, the research takes a vibration test on optimized structure of the bridge crane, using multiple point excitation method to test the structure of the bridge crane the first6order natural frequency, through comparing with the calculated optimum results of the optimization design, the research verifies the feasibility and effectiveness of the optimization method.Through theoretical analysis, this article combines the advanced optimization software platform and technology, finally verified by examples, and verifing the modeling method and the optimization method is effective. And providing a new design way to improve the structure design of bridge crane, it has an important practical value to the development of bridge crane.