旋转机械故障诊断

Z. Mahmood, N. S. Khattak
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引用次数: 0

摘要

本研究将[Lehrasab, 1999]的概念扩展到旋转机械领域。它旨在为电机或旋转机械开发新的故障诊断技术,从工业角度来看,这种诊断技术具有成本效益,更容易部署。通常,编码器数据仅用于测量速度,然而,本文试图使用通常被认为不足以用于数学建模的相同数据,以创建一组基于模型的残差。以微型塑料带形式放置在电机周围的霍尔效应传感器之间的时间为基础的速度测量是用微处理器精确测量的,而不涉及昂贵的a /D。传统方案通常部署光谱分析,这需要昂贵的传感器和强大的数据处理引擎。该方案采用传统的编码器和非常有限的浮点实现。基于模型的残差发生器可以将旋转抖动和机械故障联系起来,进一步分析可以将残差发生器与从谱域到抖动域的一系列变换联系起来。基于电机轴编码器的抖动模型,提出了一种新的基于模型的剩余发生器。系统的机械误差转化为角速度的变化。本文提出的残差发生器对4us到3s阈值的抖动分辨率很敏感。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Fault Diagnostics of Rotating Machinery
This research extends the concept of [Lehrasab, 1999] to the domain of rotating machines. It aims at developing novel fault diagnostics techniques for the motor or rotating machines for diagnostics that is costeffective and easier to deploy from industrial perspective. Normally the encoders data is only used to measure speed, however this paper attempts to use the same data normally considered insufficient for mathematical modeling, in creating a set of model based residuals. The velocity measurements based on the timing between the hall effect sensors placed around the motor in form of a mini-plastic belt is accurately measured with a microprocessor without involving expensive A/D. Conventional schemes usually deploy the spectral analysis that requires expensive sensors and powerful data processing engines. This scheme employs the conventional encoder and with a very limited floating point  implementations. The complete model based residual generator can be implemented that can relate the rotational jitters and mechanical faults and with further analysis it can be linked with a set of transformations from spectral domain to the jitter domain. The paper presents a novel model based residual generator for shaft Encoder of a motor based on its jitter model. The mechanical errors of the system are translated into variations in the angular velocity. The residual generator presented in this paper is sensitive to the resolution of jitters of 4us to cross 3s thresholds.
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