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Experimental investigations on vibration response of misaligned rotors

机译：不对中转子振动响应的实验研究

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Misalignment is one of the most commonly observed faults in rotating machines. However, there have been relatively limited research efforts in the past to understand its effect on overall dynamics of the rotor system. In the existing literature, there is confusing spectral information on the rotor vibration characteristics of misalignment. The present study is aimed at understanding the dynamics of misaligned rotors and reducing the ambiguity so as to improve the reliability of the misalignment fault diagnosis. Influence of misalignment and its type on the forcing characteristics of flexible coupling is investigated followed by experimental investigation of the vibration response of misaligned coupled rotors supported on rolling element bearings. Steady-state vibration response at integer fraction of the first bending natural frequency is investigated. Effects of types of misalignments, i.e. parallel and angular misalignments, are investigated. The conventional Fourier spectrum (i.e. FFT) has limitations in revealing the directional nature of the vibrations arising out of rotor faults. In addition, it has been observed that several other rotor faults generate higher harmonics in the Fourier spectrum and hence there could be a level of uncertainty in the diagnosis when other faults are also suspect. The present work through use of full spectra has shown possibility of diagnosing misalignment through unique vibration features exhibited in the full spectra (i.e. forward/backward whirl). This provides an important tool to separate faults that generate similar frequency spectra (e.g. crack and misalignment) and lead to a more reliable misalignment diagnosis. Full spectra and orbit plots are efficiently used to reveal the unique nature of misalignment fault not clearly brought out by the previous studies, and new misalignment diagnostics recommendations are proposed.
机译：错位是旋转机械中最常见的故障之一。但是，过去了解其对转子系统整体动力学的影响的研究工作相对有限。在现有文献中，关于未对准的转子振动特性的频谱信息令人困惑。本研究旨在了解转子未对准的动力学特性并减少歧义，从而提高转子未对准故障诊断的可靠性。研究了不对中及其类型对挠性联轴器受力特性的影响，然后对滚动轴承上支承的不对中耦合转子的振动响应进行了实验研究。研究了第一弯曲固有频率的整数分数下的稳态振动响应。研究了未对准类型（即平行和角度未对准）的影响。传统的傅立叶频谱（即FFT）在揭示由转子故障引起的振动的方向性方面有局限性。另外，已经观察到其他几个转子故障在傅立叶谱中产生更高的谐波，因此，当还怀疑其他故障时，诊断中可能存在一定程度的不确定性。通过使用全光谱的当前工作已经显示出通过在全光谱中表现出的独特振动特征（即，向前/向后旋转）来诊断失准的可能性。这为分离产生相似频谱的故障（例如裂纹和未对准）并导致更可靠的未对准诊断提供了重要的工具。有效地利用全光谱和轨道图来揭示以前的研究没有清楚指出的错位故障的独特性质，并提出了新的错位诊断建议。

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