• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文学位 >Numerical investigation of non-Newtonian and surface roughness effects on the performance of dynamically loaded journal bearings.
【24h】

Numerical investigation of non-Newtonian and surface roughness effects on the performance of dynamically loaded journal bearings.

机译：非牛顿和表面粗糙度对动载荷轴颈轴承性能影响的数值研究。

获取原文
获取原文并翻译 | 示例
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

This thesis is concerned with the development of computational analysis for the performance of dynamically loaded journal bearings with consideration of lubricant degradation and surface roughness patterns. The governing equation is the averaged Reynolds equation. The numerical approach is based on the finite element mass-conserving algorithm, proposed by Kumar and Booker.; Lubricant degradation concerns non-Newtonian effects on the performance of dynamically loaded journal bearings. A constitutive equation for multi-grade oils that can accommodate different rheological equations while providing reasonable agreement with experimental data has been implemented. Predicted results agree well with values obtained from finite difference cavitation algorithms.; The approach used to analyze various surface roughness patterns is based on the averaged Reynolds equation, proposed by Christensen, and Pair and Cheng, in which flow factors are used to modify the flow due to roughness effects. Three surface roughness patterns were investigated. The surface roughness patterns combined with the non-Newtonian lubricant behavior are incorporated to analyze the performance of journal bearings subjected to dynamic loading.; Three types of finite element grids were utilized in developed for the analysis of dynamically loaded journal bearings. Moreover, the impact of cavitation erosion, element sizes, time steps and numerical methods on the performance of dynamically loaded journal bearings are also investigated.; Computer programs based on the averaged Reynolds equation are developed to implement the various conditions considered. Journal bearings with elliptical contours are numerically considered when operating under very realistic conditions.
机译：本文涉及考虑润滑性能下降和表面粗糙度规律的动载荷滑动轴承性能计算分析的发展。控制方程是平均雷诺方程。数值方法基于Kumar和Booker提出的有限元质量守恒算法。润滑剂的降解涉及动态载荷轴颈轴承性能的非牛顿效应。已经实现了一种多级油的本构方程，该方程可以容纳不同的流变方程，同时与实验数据保持合理的一致性。预测结果与从有限差分空化算法获得的值非常吻合。用于分析各种表面粗糙度图案的方法是基于Christensen，Pair和Cheng提出的平均雷诺方程，其中使用流动因子由于粗糙度影响而修改了流动。研究了三种表面粗糙度图案。将表面粗糙度模式与非牛顿润滑剂行为结合起来，以分析承受动态载荷的轴颈轴承的性能。开发了三种类型的有限元网格，用于分析动态载荷轴颈轴承。此外，还研究了气蚀，单元尺寸，时间步长和数值方法对动载荷轴颈轴承性能的影响。开发了基于平均雷诺方程的计算机程序，以实现所考虑的各种条件。在非常现实的条件下运行时，会从数值上考虑具有椭圆形轮廓的轴颈轴承。

著录项

  • 作者

    Wang, Pinghui.;

  • 作者单位

    The University of Toledo.;

  • 授予单位 The University of Toledo.;
  • 学科 Engineering Mechanical.
  • 学位 Ph.D.
  • 年度 2003
  • 页码 199 p.
  • 总页数 199
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 机械、仪表工业;
  • 关键词

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号