The Research On Reliability Based Robust Optimization Design Of Metallic Structure For Gantry Crane

Gantry cranes as a large-scale lifting equipment is widely used,the metal structure is an important part of gantry crane,generally occupy more than 60% of the weight of the machine,the main role is to bear and pass on the crane in a variety of loads,Its design level directly affects the crane’s performance and safety performance.The application of finite element analysis theory and deterministic optimization design method has improved the existing problems of traditional design.However,due to the influence of uncertain factors in the design,manufacture and use of the crane,the optimization results do not necessarily meet the requirements of the actual requirements for security,The reliability theory and robust design method are applied to the optimization design of the crane structure,so as to achieve the effective effect of balancing the product using the safety performance and economic performance.At the same time,in order to reduce the computational cost and improve the computational efficiency,a method of replacing the finite element simulation program call with proxy model is proposed.In this paper,a model of the gantry crane metal structure as the research object,first of all,the preparation of APDL command flow program to meet the accuracy requirements of the parametric finite element model for static analysis;Then,the Isight software is used to integrate Ansys software,and the sample data reflecting the key design parameters and response relations of the crane are obtained by the experimental design method.The RBF-NN proxy model is used to fit the sample points to construct the high-precision structural performance function and the limit state function proxy model;Finally,based on the limit state function proxy model,the stochastic perturbation technique is used to obtain the structural reliability index as the constraint,and the sensitivity additional term is added to the constraint condition to achieve the robust and stable design.Compared with the general optimization design,the design results can improve the reliability and robustness of the design scheme effectively in the case of reducing the purpose of self-weighting,and have certain practical significance.