A Nonlinear Dynamic Finite Element Analysis of Drilling Shaft including Multispan Auxiliary Supports in Deep-Hole Machining

A Nonlinear Dynamic Finite Element Analysis of Drilling Shaft including Multispan Auxiliary Supports in Deep-Hole Machining
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深孔加工中多跨辅助支撑钻杆的非线性动态有限元分析

DOI:
10.1155/2013/735081
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发表时间:
2013
影响因子:
2.1
通讯作者:
Hou, X. L.
Hou, X. L.
中科院分区:
工程技术4区
文献类型:
--
作者:
Kong, L. F.;Li, Y.;Lu, Y. J.;Zhao, Z. Y.;Hou, X. L.

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提出了一种提高大型深孔钻床非线性动力学分析计算效率的方法。在有限元模型的基础上,将钻井轴系构造成基于柔性转轴的连续梁单元,以提高数值计算的精度。为了节省计算时间和资源,采用模态综合技术对钻轴系统线性自由度的特征模态进行约简。因此,不会损失非线性分析所需的精度。在此基础上,研究了钻轴系统在不同轴长条件下的涡动特性,同时得到了钻相交孔时钻轴运动在选定钻深和切削速度参数下的稳定性规律及其稳定域。
This paper presents a method to enhance computational efficiency of the nonlinear dynamic analysis of the large-scale deep-hole drilling machine. Based on finite element model, the drilling shaft system is constructed into Timoshenko beam element on the basis of flexible rotary shaft so as to increase the accuracy of numerical calculation. In order to save the calculation time and resources, modal synthesis technique is adopted to reduce the feature modal of linear freedom degrees of drilling shaft system. As a result, the accuracy required by the non-linear analysis will not be loss. On the basis of these, the whirling characteristics of drilling shaft system are studied under the conditions of different shaft lengths, and simultaneously, the stability patterns of drilling shaft motion and its stability region are obtained in the selected drilling depth and cutting speed parameters while drilling intersection holes.
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