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首页> 外文期刊>Journal of the Brazilian Society of Mechanical Sciences and Engineering >Lateral dynamics and stability analysis of a gas compressor supported by hybrid and active lubricated multirecess journal bearing
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Lateral dynamics and stability analysis of a gas compressor supported by hybrid and active lubricated multirecess journal bearing

机译：混合润滑和主动润滑多凹轴颈轴承支撑的气体压缩机的横向动力学和稳定性分析

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摘要

Fluid film forces are generated in multirecess journal bearings by two types of lubrication mechanism: the hydrostatic lubrication in the bearing recesses and hydrodynamic lubrication in the bearing lands, when operating in rotation. The combination of both lubrication mechanism leads to hybrid journal bearings (HJB). When part of hydrostatic pressure is also dynamically modified by means of hydraulic control systems, one refers to the active lubrication, resulting in the active hybrid journal bearing (AHJB). The AHJB is mathematically modeled based on the Reynolds' equations in land regions and a set of modified continuity equations for the lubricant flow in the bearing recesses, coupled to equations describing pressure and flow in the servovalves. The solution of such a set o equations allows the determination of fluid film stiffness and damping coefficients of the hybrid and/or active lubricated bearing. Such coefficients are a function of design and operational parameters, characterized by the Sommerfeld number as well by the gains of the feedback control system. The main contribution of the present theoretical work is to analyze the stability characteristics of a flexible rotor-bearing system by using passively and actively lubricated hybrid journal bearing. The dynamic of a flexible rotor is modeled by using finite element method and, after coupling the bearing dynamic coefficients to the rotor model, the feedback control law is defined and a suitable set of control gains is calculated for the active lubrication, leading to a rotor with a wider and more safety operational frequency range.
机译：在多凹槽轴颈轴承中，通过两种类型的润滑机制产生流体膜力：旋转操作时，轴承凹槽中的静液压润滑和轴承平台中的流体动力润滑。两种润滑机制的组合导致混合轴颈轴承（HJB）。当还通过液压控制系统动态调节静液压的一部分时，一种是指主动润滑，从而产生了主动混合轴颈轴承（AHJB）。 AHJB的数学模型是基于陆地区域的雷诺方程和一组修改后的连续性方程（用于润滑轴承凹口中的润滑剂）以及描述伺服阀中压力和流量的方程进行数学建模的。这样的方程组的解决方案允许确定混合和/或主动润滑轴承的流体膜刚度和阻尼系数。这样的系数是设计和操作参数的函数，其特征是索末菲数以及反馈控制系统的增益。本理论工作的主要贡献是通过使用被动和主动润滑的混合轴颈轴承来分析柔性转子轴承系统的稳定性特征。使用有限元方法对柔性转子的动力学进行建模，然后将轴承动态系数耦合到转子模型中，定义反馈控制律，并为主动润滑计算出一组合适的控制增益，从而得出转子具有更广泛，更安全的工作频率范围。

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