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Experimental and theoretical determination of hydrostatic/hybrid journal bearing rotordynamic coefficients.

机译：静液压/混合动力轴颈轴承转子动力学系数的实验和理论确定。

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摘要

Experimental and theoretical results are presented for the rotordynamic coefficients of a four-pocket oil-fed orifice-compensated hydrostatic journal bearing, including the hybrid effects of journal rotation. The test aparatus incorporates a double-spool-shaft spindle which permits independent control over the journal spin speed and the frequency of an adjustable-magnitude circular orbit, for both forward and backward whirl. This configuration yields data that enables determination of the full linear anisotropic rotordynamic model. The dynamic force measurements were made simultaneously with two independent systems, one with piezoelectric load cells and the other with strain gage load cells. A computer code based on a finite-difference solution of Reynolds lubrication equation was used to make theoretical predictions for the same configuration and operating conditions as the test matrix. The computational results agree well with test results, theoretical predictions of stiffness and damping coefficients are typically within 30% of the experimental results. For all conditions, statically centered as well as eccentric, the rotordynamic coefficients are close to isotropic. Software was developed for the high speed data acquisition and analysis of the rotordynamic coefficients in different data reduction modes, including allowed frequency dependence. The coherence functions were calculated to relate the time-averaged x and y input motion signals and the x and y time-averaged output force signals. This gave rise to four coherence functions, {dollar}gammasbsp{lcub}rm xx{rcub}{lcub}2{rcub},{dollar} {dollar}gammasbsp{lcub}rm xy{rcub}{lcub}2{rcub},{dollar} {dollar}gammasbsp{lcub}rm yx{rcub}{lcub}2{rcub}{dollar} and {dollar}gammasbsp{lcub}rm yy{rcub}{lcub}2{rcub}.{dollar} In all test cases, these coherence functions were between 0.999 and 1.
机译：给出了四腔补油节流静压轴颈轴承的转子动力学系数的实验和理论结果，包括轴颈旋转的混合效应。测试参数包含一个双线轴主轴，可以独立控制轴颈旋转速度和可调幅度圆形轨道的频率，以实现正向和反向旋转。这种配置产生的数据能够确定完整的线性各向异性转子动力学模型。动态力的测量是通过两个独立的系统同时进行的，一个系统带有压电式称重传感器，另一个系统带有应变计式称重传感器。使用基于雷诺兹润滑方程的有限差分解的计算机代码对与测试矩阵相同的配置和操作条件进行理论预测。计算结果与测试结果非常吻合，刚度和阻尼系数的理论预测通常在实验结果的30％以内。对于所有条件，无论是静态居中还是偏心，转子动力学系数都接近各向同性。开发了用于在不同数据缩减模式下（包括允许的频率依赖性）进行高速数据采集和转子动力系数分析的软件。计算相干函数以将时间平均的x和y输入运动信号与x时间和x时间平均输出力信号相关。这产生了四个相干函数，{dollar} gammasbsp {lcub} rm xx {rcub} {lcub} 2 {rcub}，{dollar} {dollar} gammasbsp {lcub} rm xy {rcub} {lcub} 2 {rcub} ，{dollar} {dollar} gammasbsp {lcub} rm yx {rcub} {lcub} 2 {rcub} {dollar}和{dollar} gammasbsp {lcub} rm yy {rcub} {lcub} 2 {rcub}。{dollar}在所有测试案例中，这些相干函数在0.999和1之间。

著录项

  • 作者

    Sawicki, Jerzy Teodor.;

  • 作者单位

    Case Western Reserve University.;

  • 授予单位 Case Western Reserve University.;
  • 学科 Engineering Mechanical.
  • 学位 Ph.D.
  • 年度 1992
  • 页码 251 p.
  • 总页数 251
  • 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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