Finite Element Analysis And Optimization Design Of Door Hoist Door Frame Structure

With the rapid development of the national economy, the expansion of the scale of industrial production and the improvement of the degree of automation, crane has been widely used in various fields of modern production. The rapid development of science and technology promotes the emergence of many advanced and interdisciplinary design methods. At the same time modern social resources worsening environment, light crane product is bound to toward intelligent and diversified economic development, energy saving. Modern social environment resources continues to deteriorate, crane product is bound to develop toward the intellectualization, diversification, energy saving and light weight. Therefore, it has very important significance to design an energy saving, more intelligent, more safe and reliable and environmental friendly crane product with the use of computer technology and modern optimization design method.In this paper, we take a certain type of gantry hoist of hydraulic engineering as the research object and use the ANSYS parametric design language to realize the parameterized modeling of the gantry structure of hoist and start the gantry structure of lightweight design. The main research contents are as follows:(1)We use the parametric design language of the finite element analysis software to realize the parameterized modeling of the gantry structure of hoist. Through the static analysis of gantry structure, gantry structure bears the maximum stress and strain in the fifth condition (static load test), which occurs in the position of the girder flange with a concentrated load. But the design meets the requirements.(2)Take quality loss as the goal, structure size parameters as design variables, allowable stress and deflection as the constraint condition. The gantry structure of hoist has been optimized based on genetic algorithm, after optimization its weight decreases nearly 30%.(3)We consider that uncertainty has the effect of the quality and performance of products, so Monte Carlo simulation method is used to analyze the reliability of the optimized structure model, and the reliability of the optimized model and the sensitivity of each design variable are obtained. The results show that the reliability of the optimized model is 86.5%.The function is the most sensitive to the allowable stress, cover thickness and web thickness.(4)Based on deterministic optimization and reliability analysis of the gantry structure, we introduce Six Sigma to the design and combine the Monte Carlo sampling simulation with genetic algorithm to complete Six Sigma robust optimization design of the gantry structure. The results show that the weight of the gantry structure after robust optimization design is reduced by about 21.6%. The weight of robust optimized model has increased, but the sensitivity of objective functions to uncertain factors, such as the girder plate thickness and the web thickness, has decreased. The reliable degree reaches 0.98.(5)Finally, combining with Visual Basic and ANSYS software, the parametric design and analysis software of the gantry structure of hoist has been successfully developed. It can provide reference for the design of hoist, at the same time, improve the working efficiency of designers, and shorten the cycle of the development of the hoist products.