Dynamic Analysis System Of Shearer Cutting Unit Based On NX/Nastran

At present,the dynamics analysis process of shearer cutting unit of the shearer is to add the part's three-dimensional model to the load and constraint under actual working conditions and then use the analysis software to settle the problem.The purpose of dynamic analysis is to obtain the shearer part insufficient design parameters to optimized,in order to meet the user's requirements.As a link in the process of dynamic analysis,it is a great significance to the design process of shearer cutting unit.Although most companies at present have applied the dynamic analysis software to improve the shearer design capability,the designers not only use redundant and complicated steps to build the three-dimensional models and simulation models needed for dynamic analysis,but also only the simulation results can be optimized for part parameters in an empirical and intuitive way,so that there are still design drawbacks.The secondary development technology and dynamic analysis of computer software provide a direction for solving the above problems.Therefore,using NX/Nastran as an application platform,the parameterized design idea is combined with the secondary development technology,and the C++ language is used to develop the dynamic analysis system of the shearer cutting unit to solvethe above-mentioned design drawbacks.The research content and characteristics of this article are as follows:Through the research on computer software secondary development technology and parametric design ideas,combined with the needs of shearer cutting unit designers,the design goals and technical route of the system are formulated,and the development environment of the system is determined,and the function modules of each subsystem in the system are described.According to the parametric modeling method,the subsystem is built,and the modeling process method and the model-driven method are used to construct the system for the gear parts and the non-gear parts,and the input parameters in the dialog are used to complete the construction of the three-dimensional model.At the same time,the interface of the parametric modeling subsystem is designed,and the model after the parameterized modeling subsystem is built or modified can be directly applied in the dynamics analysis subsystem.According to the dynamic analysis process,the subsystem is built,the process of establishing the finite element model and the simulation model is studied,the process is abstracted and analyzed,the variable parameters are extracted,the input parameters are completed in the dialog,and the finite element model and the simulation model are constructed..According to the boundary conditions set in the simulation model,the subsystems are divided into four parts: the linear static analysis module,the modal analysis module,the transient analysis module,and the frequency response analysis module.Buildingthe analysis result acquisition interface to achieve optimal design.The subsystem can establish the feasible domain in the mathematical model based on the dynamic analysis results.According to the optimization design method,the subsystem is built,and the establishment process of the mathematical model in the mechanical optimization design is studied.Combined with the results of the dynamic analysis,the parameters are entered in the dialog and the analysis results are selected to complete the construction of the optimized design mathematical model.Through multiple iterative calculations,the optimal solution is solved,and the parametric modeling subsystem is invoked to complete the optimization of the three-dimensional model of the parameter.The NX/Nastran shearer dynamics analysis system,which was finally established and completed,is fully functional and can meet the software application requirements of designers throughout the product design cycle.This system realizes the organic combination of parametric modeling,dynamic analysis and optimization design through the compilation of interface functions,which not only ensures the rationality of product design,but also greatly improves the design efficiency.