| Summing up literatures on the research and development of hydraulic excavators,there exist gaps in the strategy among domestic and developed countries,in which it is mainly behaved in the application of computer aided technology----a CAD/CAE/CAO design system has not been formed in the utilization of modern design theory to the detailed links.Taking the working device of backhoe hydraulic excavator as the target,a methord integrating the secondary development of CAD software,the co-simulation of CAE software,the secondary development of CAE software and the optimization of CAO software is implemented,which can be referenced for subsequent research.The main contents include in the following aspects:1.3D digital model development of working device based on CATIA/CAABased on CATIA platform,the parametric design module of working device is customized by CAA,RADE and Visual Studio 2005.Users need only inputing basic parameters in the interface easily modeling parts and assemblies of the working device,which enhances the efficiency and provides geometric models for subsequent simulation optimization.To improve inconvenience in data management and limited interface development controls,a method of secondary development of CATIA/CAA using Access database and MFC control is adopted.2.Rigid-flexible coupling simulation of working device based on ADAMS and ABAQUSFirstly,the ADAMS software is used to establish the pure rigid virtual prototype model of working device,and its correctness is verified by comparing the simulation values and design values of the special working sizes.Secondly,the geometry models of boom and arm are imported into ABAQUS software for constrained modal analysis,and the corresponding modal neutral files are obtained.Lastly,the modal neutral files are used to replace the boom and arm in the established pure rigid virtual prototype model from the rigid body to the flexible body,making up the rigid-flexible coupling model of the working device.The force changes of the hinge points of the boom under two typical working conditions are obtained through the simulation calculation,which provide load boundary conditions for subsequent stiffness and strength analysis of the boom.3.Finite element analysis of the boom based on secondary development of ABAQUS GUIThe function plug-in for the static analysis and modal analysis of the boom is customized by secondary development of ABAQUS/CAE based on Python scripting language and ABAQUS GUI toolkit.Users only needs to specify the storage location of the boom geometry model and the load file in the custom interface and input relevant parameters to automatically complete the corresponding finite element simulation analysis process,which can realize the push-button operation for stiffness analysis,strength analysis,and modal analysis of the boom and lay the foundation for subsequent multi-objective optimization design of the boom.4.Multi-objective integrated optimization of the boom based on ISIGHTFirstly,by integrating CATIA and ABAQUS in ISIGHT,the multi-objective optimization design simulation platform is built to reach the purpose of optimizing the maximum stress,the maximum deformation and first-order natural frequency without increasing the mass.Secondly,the Optimal Latin Hypercube method is utilized to carry out the design of experiments of the pre-selected design variables,and the key design variables are selected by the Pareto graph.Thirdly,according to the DOE sample data,the RSM model and the RBF model of the mass,the maximum deformation,the maximum stress and the first-order natural frequency of the boom are established,and the best approximate model is selected by the accuracy evaluation index.Lastly,the NSGA-II algorithm is used to carry out multi-objective optimization design of the boom and the optimization results are verified by simulation.The comparison of the performance indicates the multi-objective integrated optimization of this paper has obtained reasonable results. |
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