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Unsteady analysis of the fluid film forces in a long-bearing squeeze film damper.

机译:长期挤压膜阻尼器中流体膜力的不稳定分析。

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The squeeze film damper is a device used to suppress vibrations in turbomachinery. One of two one-dimensional flow assumptions is typically used in the analysis of a squeeze film damper. In the long damper assumption, the flow in the axial direction is considered negligible, and all of the flow is circumferential. To date, all long squeeze film damper analyses have used either steady state methods or perturbation techniques to predict the fluid film force for circular centered orbits. This dissertation describes the first fully unsteady numerical analysis of the long squeeze film damper and compares the predictions of the analysis to experimental data. The Generalized Fluid System Simulation Program (GFSSP) is used to model the fluid flow within the damper. The results provided show that predicted damping falls within the uncertainty of the experimental data, and is a significant improvement over previous steady-state analyses. Additionally, the first unsteady analysis for statically eccentric operation of a squeeze film damper is provided.
机译:挤压膜阻尼器是一种用于抑制涡轮机械振动的装置。通常在挤压膜阻尼器的分析中使用两个一维流动假设之一。在长阻尼器假设中,轴向上的流动被认为是微不足道的,并且所有流动都是周向的。迄今为止,所有长挤压膜阻尼器分析都使用稳态方法或微扰技术来预测圆心轨道的流体膜力。本文描述了长挤压膜阻尼器的第一个完全非稳态数值分析,并将分析的预测结果与实验数据进行了比较。通用流体系统仿真程序(GFSSP)用于对阻尼器内的流体流动进行建模。提供的结果表明,预测的阻尼落在实验数据的不确定性之内,并且是对先前稳态分析的重大改进。另外,提供了用于挤压膜阻尼器的静态偏心操作的第一不稳定分析。

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