Design of an active hydromagnetic journal bearing
Design of an active hydromagnetic journal bearing
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DOI：
10.1177/1350650112466164
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发表时间：
2013-07
期刊：
影响因子：
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通讯作者：
Michael G. Farmakopoulos;P. Nikolakopoulos;C. Papadopoulos
中科院分区：
文献类型：
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作者：
Michael G. Farmakopoulos;P. Nikolakopoulos;C. Papadopoulos
本文设计并提出了一种主动磁流体径向轴承，它是一种新型的动静压径向轴承。所提出的新的机电智能装置具有包含轴承的两个部分的公共轴承壳，这是联合收割机的尝试，其结合两种类型的轴承的优点以克服它们的缺点，并且为不稳定性控制、增加的承载能力、转子系统的诊断等带来新的可能性。根据旋转机械的需要，可以选择主动磁轴承或混合轴颈轴承。流体动力润滑在轴承内表面中发展，并且磁轴承的电磁体被放置在其外表面之外。主动磁流体轴颈轴承设计有适当的间隙，以便流体动力轴承和磁轴承都可以运行。计算了主动磁流体径向轴承的合适工作区域，并将其表示为气隙和间隙之间的最佳比率的组合。此外，使用二维有限元法（ANSYS）的仿真代码开发的磁流体径向轴承的磁组件的性能进行了模拟，并使用ANSYS软件获得的流体动压场的解。计算了动静压滑动轴承的刚度和阻尼系数随索末菲数的变化规律。在混合轴承运行中，相应的刚度和阻尼系数被用来模拟磁流体轴承的动态行为。每个混合系数由两部分组成：流体动力学和磁性部分。当操作是纯流体动力时，动态系数的磁性部分为零，反之亦然，而这两个部分都存在于混合操作模式中。
An active hydromagnetic journal bearing is designed and presented in this study, which is a new and innovative type of hybrid journal bearing. The proposed new mechatronic smart device has a common bearing shell that contains the two parts of the bearing, which is an attempt to combine the advantages of both types of bearings to overcome their drawbacks and give rise to new possibilities for instability control, increased load-carrying capacity, diagnostics of the rotor system, etc. The active hydromagnetic journal bearing should operate as either a hydrodynamic, active magnetic or hybrid journal bearing, depending on the needs of the rotating machinery. The hydrodynamic lubrication is developed in the inner bearing surface, and the electromagnets of the magnetic bearing are placed outside its outer surface. The active hydromagnetic journal bearing is designed with the appropriate clearance, so that both the hydrodynamic and magnetic bearings can operate. The suitable operational regions for the active hydromagnetic journal bearing are calculated and presented as a combination of the optimum ratio between the air gap and the clearance. Additionally, a simulation code using the two-dimensional finite element method (ANSYS) is developed to simulate the performance of the magnetic component of the active hydromagnetic journal bearing, and the ANSYS software is used to obtain a solution for the hydrodynamic pressure field. The dynamic characteristics of the hybrid journal bearing in terms of the stiffness and damping coefficients versus the Sommerfeld number are calculated and presented. In the hybrid bearing operation, the corresponding stiffness and damping coefficients are used to simulate the hydromagnetic bearing dynamic behaviour. Each hybrid coefficient consists of two parts; the hydrodynamic and the magnetic part. When the operation is purely hydrodynamic, the magnetic parts of the dynamic coefficients are zero and vice versa, whereas both parts are present in the hybrid operation mode.