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首页> 外文会议>ASME international design engineering technical conferences and computers and information in engineering conference 2010 >MORTON EFFECT INDUCED SYNCHRONOUS INSTABILITY IN MID-SPAN ROTOR-BEARING SYSTEMS, PART 2: MODELS AND SIMULATIONS
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MORTON EFFECT INDUCED SYNCHRONOUS INSTABILITY IN MID-SPAN ROTOR-BEARING SYSTEMS, PART 2: MODELS AND SIMULATIONS

机译：中跨转子轴承系统中的摩顿效应引起的同步不稳定，第2部分：模型和仿真

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The mechanism of the Morton Effect induced synchronous instability has been discussed in Part 1, using an assumption of isotropic linear bearings. The second part of the current study will now focus on the more realistic systems, mid-span rotors supported by the hydrodynamic journal bearings. First, the models to calculate the thermal bending of the shaft and the temperature distribution across the journal surface are established. This can be used to calculate the equivalent thermal imbalance. The calculations of the temperature difference and its equivalent thermal imbalance using hydrodynamic plain journal bearing models are conducted and discussed with the comparison to the analytical results obtained in Part 1. It shows that the thermal imbalance induced by the Morton Effect may increase to the level of the mechanical imbalance and then its influence on the system stability should be included. The suggested thermal bending model also partially explain that the mid-span rotors are less liable to be influenced by the Morton Effect induced instability than are the overhung configurations, because of the restraining effect between two supports. Finally, a symmetric mid-span rotor -hydrodynamic journal bearing system is calculated to show its stability performance. The results show the inclusion of the Morton Effect may lead to an unstable operation of the system. Considering the existence of the oil film self-induced vibration due to the dynamic characteristics of fluid film bearings, thernMorton Effect may make a further negative impact on the stability of the system. . The simulation results of the unbalance response show that the Morton Effect changes the shapes of the whirling orbits and makes them no longer be the standard elliptical orbits around the static equilibriums.
机译：在第1部分中，使用各向同性线性轴承的假设，讨论了莫顿效应引起的同步不稳定性的机理。现在，本研究的第二部分将重点放在更现实的系统上，即由流体动力轴颈轴承支撑的中跨转子。首先，建立用于计算轴的热弯曲和轴颈表面温度分布的模型。这可用于计算等效热不平衡。与水动力滑动轴颈轴承模型进行了温度差及其等效热不平衡的计算，并与第1部分中获得的分析结果进行了比较。结果表明，莫顿效应引起的热不平衡可能会增加到机械不平衡及其对系统稳定性的影响也应包括在内。所建议的热弯曲模型还部分解释了，由于两个支撑件之间的约束作用，中跨度转子比悬臂结构更不容易受到莫顿效应引起的不稳定性的影响。最后，计算了对称的中跨转子-流体动力轴颈轴承系统，以显示其稳定性能。结果表明，包含莫顿效应可能会导致系统运行不稳定。考虑到由于液膜轴承的动态特性而导致的油膜自激振动的存在，莫顿效应可能会对系统的稳定性产生进一步的负面影响。 。不平衡响应的仿真结果表明，莫顿效应改变了回旋轨道的形状，使它们不再是围绕静态平衡的标准椭圆形轨道。

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