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首页> 外文会议>American Society of Mechanical Engineers(ASME)/Society of Tribologists and Lubrication Engineers(STLE) International Joint Tribology Conference 2004(IJTC 2004) vol.1 pt.A; 20041024-27; Long Beach,CA(US) >EXPERIMENTAL ROTORDYNAMIC COEFFICIENT RESULTS FOR A LOAD-ON-PAD FLEXIBLE-PIVOT TILTING-PAD BEARING WITH COMPARISONS TO PREDICTIONS FROM BULK-FLOW AND REYNOLDS EQUATION MODELS
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EXPERIMENTAL ROTORDYNAMIC COEFFICIENT RESULTS FOR A LOAD-ON-PAD FLEXIBLE-PIVOT TILTING-PAD BEARING WITH COMPARISONS TO PREDICTIONS FROM BULK-FLOW AND REYNOLDS EQUATION MODELS

机译：带有垫块流动和雷诺方程模型的预测结果比较的柔性垫块式垫板轴承的实验转子动力学系数结果

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摘要

Experimental dynamic-stiffhess-coefficient results are presented for a high-speed, lightly loaded, load-on-pad, flexible-pivot tilting-pad bearing. Results show that the real part of the direct dynamic-stiffness coefficients are quadratic functions of the excitation frequency. This frequency dependency is modeled well by an added-mass coefficient, and the resultant [M], [K], and [C] matrix model is frequency-independent versus a conventional [K] and [C] model that is frequency dependent. The dynamics introduced by the additional pad degrees of freedom (including pad inertia and web moment stiffness) and the effects of fluid inertia in the lubricant film account for part of this frequency dependency. Experimental results are compared to numerical predictions from models based on: (ⅰ) the Reynolds equation, and (ⅱ) a Navier-Stokes (NS) equations bulk-flow model that retains the temporal and convective fluid inertia terms. The NS bulk-flow model results correlate better with experimental dynamic stiffness results, including added-mass terms. Both models underestimate the measured added-mass coefficients for the full excitation range; however, they do an adequate job for excitation frequencies up to synchronous frequency. The frequency dependency predicted by using a [K] and [C] model can be removed by adding a mass matrix to the reaction-force model with either a Reynolds equation or a bulk-flow NS model, with a very considerable speed up in calculation of damped eigenvalues for rotor-bearing systems.
机译：给出了高速，轻载，垫块负载，柔性枢轴可倾瓦块轴承的实验动态刚度系数结果。结果表明，直接动态刚度系数的实部是激励频率的二次函数。通过增加质量系数可以很好地建模此频率依赖性，并且所得的[M]，[K]和[C]矩阵模型与频率无关，而与传统的[K]和[C]模型则具有频率依赖性。附加的摩擦片自由度（包括摩擦片惯性和腹板力矩刚度）和润滑膜中流体惯性的影响所引入的动力学是这种频率依赖性的一部分。将实验结果与基于以下模型的数值预测进行比较：（ⅰ）雷诺方程，和（ⅱ）Navier-Stokes（NS）方程整体流模型，其中保留了时间和对流流体惯性项。 NS大流量模型的结果与实验动态刚度结果（包括附加质量项）的相关性更好。两种模型都低估了整个励磁范围内测得的附加质量系数。但是，它们对于直到同步频率的激励频率都做得很好。使用[K]和[C]模型预测的频率相关性可以通过使用雷诺方程或整体流NS模型向反作用力模型添加质量矩阵来消除，从而大大提高了计算速度轴承系统的阻尼特征值。

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