Research On CAD/CAE Integrated Parametric Optimization Design Of Reconfigurable Rail Guided Vehicle

As a typical logistics equipment in modern logistics storage system,Rail Guided Vehicle(RGV)has the characteristics of dynamic transfer,non-standard and customization.On the one hand,due to the diversity of users’ needs,the design of RGV is a bottleneck in the production process because it is time-consuming and has high cost.On the other hand,with the increasingly fierce competition in the logistics equipment market,the traditional empirical design is difficult to win the competitive advantage for enterprises.It is urgent to carry out the structural optimization design of RGV by combining digital design and analysis means such as CAD and CAE.Based on CAD and CAE technology,the modular and parametric optimization designs of RGV are effective means for the decrease of the design and development period,the improvement of design efficiency,and the enhancement of user satisfaction.However,only a few relevant studies have been reported,and effective design methods and software are still relatively lacking.In addition,in order to improve the reusability of RGV,it is necessary to design a reconfigurable RGV that can adapt to the changes of transportation demand within a certain range.In response to the actual demand of a logistics equipment enterprise for parametric design,the methods of reconfigurable modular design and parametric optimization design for RGV,and development of the parametric optimization design software for reconfigurable RGV integrating CAD/CAE are studied,so as to realize the rapid customization and optimization design of reconfigurable RGV.The main work and achievements of this paper are as follows.(1)The reconfigurable modular design method of RGV is studied.According to the mechanical structure composition and main functions of the RGV,the module division of the RGV is realized.The structure refinement and reconfigurable structure innovation design are carried out for the conveyor module,walking mechanism module and frame module to improve the reconfigurable ability of the RGV.In this paper,the method of RGV configuration design based on Case based Reasoning is studied.And the customized RGV configuration design is realized.(2)The parametric design method of reconfigurable RGV is studied,and the parametric CAD model is established.According to the designed RGV structure,the methods of key structural parameters design and motor selection of RGV are given.Using the parametric redevelopment interface provided by the API of Solid Works,and according to the design parameters and constraint relationship of parts,the parametric CAD model of RGV is established to change the design parameters and drive the model update.(3)The parametric CAE analysis of the main parts of the RGV is realized.The parametric analysis command flow of main parts is designed based on ANSYS APDL,the stress analysis of parts is realized,and the analysis results are extracted for optimal design.(4)The mathematical model of parametric optimization design is established,and the particle swarm optimization algorithm is designed to solve the optimization problem.By the design objectives of lightweight,low cost and high reconfigurability,decision variables of the size of parts,materials and motor parameters,and constraints of strength requirements and design requirements,a mathematical model to realize the comprehensive optimization of design requirements is established.The method of real and discrete hybrid encoding is applied in this algorithm.And a continuous optimization and mutation mechanism for real coded particle dimension,and multi-fragment crossover mechanism and mutation mechanism for discrete coded particle dimension are adopted.Moreover,the parametric CAE analysis is carried out every time the particle is updated to ensure that the strength requirements are met during the structural optimization of parts.By the design of optimization cases and the comparation of results with genetic algorithm,the effectiveness of particle swarm optimization algorithm in solving this problem is verified.(5)The integrated software platform system is developed by integrating the above design methods and optimization algorithms.The development platform is established using Visual Studio 2010,and C# is used for the programing.By the redevelopment of Solid Works 2015 and ANSYS 19.0,and the use of My SQL to manage the data,an integrated software that can realize the reconfigurable design and rapid customized optimization design of RGV is developed.