Modeling linear guide systems with CoFEM: experimental validation
Modeling linear guide systems with CoFEM: experimental validation
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DOI：
10.1007/s11740-012-0377-7
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发表时间：
2012-04
期刊：
影响因子：
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通讯作者：
A. Dadalau;A. Verl
中科院分区：
文献类型：
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作者：
A. Dadalau;A. Verl
在这项工作中，很快提出了一种新的高效滚动接触有限元 (FE) 模型 [RiBEM（具有等效材料的刚性球）]。 RiBEM 模型用于有效计算线性导轨系统的本征模态。对实际直线导轨的实验模态分析显示，误差为 5%，与数值结果具有非常好的相关性。尽管与标准有限元模型相比，新的接触模型减少了十倍以上的计算时间，但在整个机床模型中使用它仍然太昂贵。因此，引入了基于赫兹理论的等效、独立于网格且几何可扩展的模型（滚动接触弹簧），并借助模态测量进行了验证。作为所提出工作的合理性，还提供了制造商的刚度数据的结果，并且在这种情况下发现与实验的相关性较小。
In this work a new efficient finite element (FE) model for rolling contact [RiBEM (rigid ball with equivalent material)] is shortly presented. The RiBEM model is used to efficiently compute the eigenmodes of a linear guide system. Experimental modal analysis of the real linear guide shows with 5 % error a very good correlation with the numerical results. Although the new contact model reduces computational time by more than ten times compared with the standard FE model, it is still too expensive for use within whole machine tool models. For this reason an equivalent, mesh independent and geometrically scalable model (rolling contact spring) based on the Hertz theory is introduced and also validated with the help of modal measurements. As a justification for the presented work, results with stiffness data from the manufacturer are also presented and less correlation with the experiment is found in this case.