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首页> 外文期刊>Applied Mechanics Reviews: An Assessment of the World Literature in Engineering Sciences >A Review of the Rotordynamic Thermally Induced Synchronous Instability (Morton) Effect
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A Review of the Rotordynamic Thermally Induced Synchronous Instability (Morton) Effect

机译：旋转动力学热诱导同步不稳定（Morton）效应的综述

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摘要

The Morton effect (ME) is a thermally induced instability problem that most commonly appears in rotating shafts with large overhung masses and supported by fluid-film bearings. The time-varying thermal bow, due to the asymmetric journal temperature distribution, may cause intolerable synchronous vibrations that exhibit a hysteresis behavior with respect to rotor speed. First discovered by Morton in the 1970s and theoretically analyzed by Keogh and Morton in the 1990s, the ME is still not fully understood by industry and academia experts. Traditional rotordynamic analysis generally fails to predict the potential existence of ME-induced instability in the design stage or troubleshooting process, and the induced excessive rotor vibrations cannot be effectively suppressed through conventional balancing, due to the continuous fluctuation of vibration amplitude and phase angle. In recent years, a fast growing number of case studies of ME have sparked academic interest in analyzing the causes and solutions of ME, and engineers have moved from an initial trial and error approach to more research inspired modification of the rotor and bearing. To facilitate the understanding of ME, the current review is intended to give the most comprehensive summary of ME in terms of symptoms, causes, prediction theories, and solutions. Published case studies in the past are also analyzed for ME diagnosis based on both the conventional view of critical speed, separation margin (SM), and the more recent view of the rotor thermal bow and instability speed band shifting. Although no universal solutions of ME are reported academically and industrially, recommendations to help avoid the ME are proposed based on both theoretical predictions and case studies.
机译：Morton效应（ME）是热诱导的不稳定性问题，最常出现在具有大的悬臂轴承并且由流体膜轴承支撑的旋转轴上。由于不对称的轴颈的温度分布，时变热弓可能导致常规的同步振动，其表现出相对于转子速度的滞后行为。第一次在20世纪70年代的莫顿发现和1990年代的大古翁和莫顿的理论分析，我仍然没有得到行业和学术专家的完全理解。传统的旋转动力学分析通常无法预测设计阶段或故障排除过程中ME引起的不稳定性的潜在存在，并且由于振动幅度和相位角的连续波动，不能有效地抑制感应过多的转子振动。近年来，对我的快速越来越多的案例研究引发了分析我的原因和解决方案的学术兴趣，并且工程师已经从初步试验和误差方法移动到更多研究启发了转子和轴承的改进。为了促进对我的理解，目前的审查旨在根据症状，原因，预测理论和解决方案提供最全面的综述。过去的发布案例研究还基于临界速度，分离边缘（SM）的常规视图，以及转子热弓和不稳定速度带移位的更近期视图，分析了我的诊断。虽然在学者和工业上没有对我的普遍解决方案，但基于理论预测和案例研究，提出了帮助避免我的建议。

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