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基于全矢谱的故障预测关键技术研究
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摘要
随着科学技术和工业技术的飞速发展,各种设备的自动化程度越来越高,功能也愈加完善,设备的复杂程度也越来越高,对提取的与设备状态有关的信号的准确度要求也越来越高。实践表明,传统的单通道信号分析技术已经不能满足工业现场对设备状态检测与故障诊断高准确性、高可靠性的要求。针对旋转机械单源振动信号包含信息不完整的缺陷,基于数据融合思想的全信息数据处理及故障诊断技术应运而生。其中基于数据层融合技术的全矢谱分析技术能够全面地表达转子振动的强度和频谱结构,并且其图谱表现形式与传统频谱分析方法相兼容,与其它全信息技术相比,具有独特的优势。
     在设备状态预测领域,针对旋转机械单源振动信号包含信息不完整的缺陷,基于数据融合思想,将全矢谱技术分别与时间序列自回归AR(n)模型、基于最小二乘参数估计的线性拟合模型、简单滑动平均预测模型、指数平滑预测模型等预测技术相结合,提出了基于全矢谱技术的时间序列自回归AR(n)模型、基于全矢谱技术的线性拟和、基于全矢谱技术的简单滑动平均、基于全矢谱技术的指数平滑法预测方法,分别给出其计算方法及参数优化算法并加以分析比较。结果表明,基于全矢谱的预测方法相比传统单通道预测方法在各个频段上预测精度一致性更高,能够更加全面、准确地反映设备运行状态的发展趋势,是一种准确、有效、实用的旋转机械状态预测方法。
     本文以全矢谱的预测理论为基础,以构建设备点检预测系统为目标,在Windows操作系统平台下,利用Visual C++程序开发工具以及SQL Server 2000数据库工具建立了基于全矢谱技术的设备状态预测系统,实现了历史数据的波形、频谱显示及预测分析。这对设备状态预测以及故障早期预测在工程实际中的实现以及全信息预测技术在工程实际中的应用有着非常重要的意义。
As science and technology and the rapid development of industrial technology, a variety of increasingly high degree of automation equipment, its function has become even more perfect, which increasing the complexity in the monitoring equipment, increasingly high demands on the accuracy of testing and fault diagnosis of signals. Practice has shown that the traditional single-channel signal analysis techniques cannot meet the requirements of high accuracy and high reliability. For the defects of incomplete information of single source vibration signals of rotating machinery, full information data processing and fault diagnosis technology came into being which based on data fusion. The technique of vector spectrum which based on the data level fusion can fully express vibration strength and frequency structure, and its expression pattern is compatible with the traditional method of spectrum analysis, has an unparalleled advantage.
     In the field of equipment status forecast, for the defects of incomplete information of single source vibration signals of rotating machinery, based on the method of data fusion, combing the vector spectrum technology with the time sequence autoregressive AR(n) model, parameter estimation based on least squares linear regression model, simple sliding smoothing forecasting model, exponential smoothing forecasting models combining prediction, proposed the time sequence autoregressive AR(n) model forecast method based on vector spectrum technology, the linear fitting forecast method based on vector spectrum technology, the simple moving average forecast method based on vector spectrum technology, the exponential smoothing forecast method based on vector spectrum technology, respectively give computational method and parameter optimization algorithms and to compare them. The results show that the spectrum prediction method based on vector spectrum technology has higher prediction accuracy in each frequency bands which can comprehensively and accurately reflect the state of the development trend of mechanical operation, is an accurate, effective, practical prediction method of rotating machinery.
     This article based on the prediction theory of vector spectrum technology, to the goal of building an equipment of inspection forecasting system, in the Windows operating system platform, using the Visual C++ programs development tools and SQL Server 2000 database tools to build an equipment condition forecasting system based on vector spectrum technology which realize the historical data, waveform, spectrum display, and prediction analysis. This work has a very important significance to the prediction of the equipment state and early prediction of the realization in engineering practice and full information forecasting techniques in practical application of engineering.
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