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耦合结合面特性的重型数控龙门机床的建模

Keywords: 重型数控龙门,有限元,结合面,建模

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Abstract:

针对重型数控龙门机床中存在的大型结合面,提出了一种结合面建模的新方法.该方法基于有限元理论,对结构件和结合面分别进行建模.在结构件建模中将连续体有限元离散,在2个结构件结合面处划分足够密集且一一对应的单元和节点;在结合面建模中,采用2节点12自由度的单元对2个结构件结合面一一对应的节点进行连接,建立了2个子结构结合面处节点间拉伸、压缩与扭转关系的结合部空间单元模型,完成了结合部建模和子结构模型耦合.利用该方法并基于HYPERMESH和ANSYS软件实现了耦合结合面特性的某重型数控龙门机床的建模和分析.与忽略结合面特性的机床模型进行仿真分析和实验测试数据对比,验证了耦合结合面特性建模方法的有效性,解决了耦合结合面特性的龙门机床建模问题.

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