挖掘机工作装置的CAD模型简化

针对液压挖掘机工作装置的CAD模型在进行有限元分析时存在网格划分质量差、计算时间长等问题,利用UG软件的二次开发功能,并通过C++语言编程,实现了挖掘机工作装置模型的过程简化,提高了其有限元模型的分析精度和设计效率。首先,利用C++语言和二次开发函数UG/Open API编写的程序,将模型中不影响分析结果或对分析结果影响很小的细小特征进行删除;然后,通过程序自动提取工作装置模型的中位面;最后,利用连接、缝合操作对中位面模型进行了完善,使其有利于模型的网格划分和分析。研究结果表明,通过各步骤对挖掘机的工作装置模型进行简化后,网格划分的质量和有限元分析的精度得到了改善,大大降低了在CAE软件中的分析时间,从而提高了设计效率。

Simplification of CAD model of excavator working device

Aiming at the problems of poor quality of mesh generation and long time of calculation of the CAD model of hydraulic excavator＇s working device, the simplification process of the models were realized by the program with the tools of secondary development of UG software and C ＋＋ language to enhance the analysis precision and design efficiency of the finite element model of excavator＇s working device. Firstly, the characters with no or little effect to the analysis result were removed by the program compiled by C ＋＋ language and secondary development function of UG/0pen API. Secondly, the midsurface model of working device was extracted automatically by the program. Finally, the midsurface model was improved by the process of connecting and stitching to the benefit of mesh generation and analysis. The results indicate that the quality of mesh generation and analysis precision are improved with the above simplification procedures of the model,the analysis time is greatly reduced in the CAE software and the efficiency is riched.