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Modeling and analyzing the journal-thrust bearing system in rock-drilling bits under mixed-elastohydrodynamic lubrication.

机译：混合弹性流体动力润滑下岩石钻头轴颈推力轴承系统的建模与分析。

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摘要

The increasingly high demands for compact design require modern machinery to work under severe operating conditions. Moreover, global competition requires industries to rapidly improve their product design. Numerical modeling and computer simulation can be utilized to help industries develop cutting edge products in a short design cycle. The research in this thesis aims at modeling journal bearing and journal-thrust bearing systems for rock-drilling bit design.; A steady-state mixed-thermo-elasto-hydrodynamic (TEHD) model for journal bearings has been developed first as the baseline information for the coupled journal-thrust bearing system, which considers the fluid flow in the gap formed by rough surfaces, asperity contact, surface thermoelastic, as well as heat transfer. The model is verified with experimentally measured temperature data. Numerical simulations of the operation of a typical journal bearing are conducted and the importance of several factors affecting the mixed lubrication mechanism is discussed.; Drilling bits, as well as many mechanisms, such as computer hard drives, gear trains, and machine tool spindle systems, operate under both axial and radial loads, which should be respectively supported by thrust and journal bearings. By utilizing the end face of the shaft of a journal bearing as a thrust bearing, a coupled journal-thrust bearing system can be formed. A mixed lubrication model is then developed to investigate the lubrication of this type of coupled bearing system. A conformal-mapping method is proposed in the model formulation to facilitate a universal flow description. In order to study the influence of boundary conditions on the performance of the bearing system, either the Reynolds boundary conditions or the JFO's mass conserving cavitation conditions are applied to the governing Reynolds equations. Two types of misalignment (axial and twisting) are considered. The performance of a typical coupled journal-thrust bearing system is numerically studied. Effects of elastic deformation, misalignment on the system performance are discussed.; The method developed for the coupled bearing systems is extended to a methodology of bearing module integration. Eight generic modules are created, which can be assembled to obtain multiple coupled bearing systems.
机译：对紧凑型设计的要求越来越高，要求现代机械必须在苛刻的工作条件下工作。此外，全球竞争要求行业迅速改善其产品设计。可以利用数值建模和计算机仿真来帮助行业在较短的设计周期内开发出最先进的产品。本文的研究旨在为岩石钻头设计建模轴颈轴承和轴颈推力轴承系统。首先开发了用于轴颈轴承的稳态混合热弹流体力学（TEHD）模型，作为耦合轴颈推力轴承系统的基线信息，该模型考虑了由粗糙表面形成的间隙中的流体流动，粗糙接触，表面热弹性以及传热。该模型已通过实验测量的温度数据进行了验证。进行了典型轴颈轴承运行的数值模拟，并讨论了影响混合润滑机理的几个因素的重要性。钻头以及许多机构，例如计算机硬盘驱动器，齿轮系和机床主轴系统，都在轴向和径向载荷下工作，应分别由推力轴承和轴颈轴承支撑。通过将轴颈轴承的轴的端面用作推力轴承，可以形成联接的轴颈-推力轴承系统。然后，开发了一种混合润滑模型，以研究这种类型的联轴器轴承系统的润滑情况。在模型公式中提出了保形映射方法，以方便通用流程描述。为了研究边界条件对轴承系统性能的影响，将雷诺边界条件或JFO的质量守恒空化条件应用于控制雷诺方程。考虑了两种类型的未对准（轴向和扭曲）。对典型的轴颈-推力耦合轴承系统的性能进行了数值研究。讨论了弹性变形，未对准对系统性能的影响。为耦合轴承系统开发的方法扩展到轴承模块集成的方法。创建了八个通用模块，可以将其组装以获得多个耦合轴承系统。

著录项

  • 作者

    Wang, Yansong.;

  • 作者单位

    Northwestern University.;

  • 授予单位 Northwestern University.;
  • 学科 Engineering Mechanical.
  • 学位 Ph.D.
  • 年度 2003
  • 页码 191 p.
  • 总页数 191
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 机械、仪表工业;
  • 关键词

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