摘要
如何确保生产的安全、提高产品的质量以及整体的经济效益是现代工业生产过程中非常关键的问题,一种有效解决该问题的技术手段是有效的过程性能监控和故障诊断的应用。现代计算机及信息技术的迅猛发展使得工业生产过程中越来越多的变量能够得到测量、处理和监控。统计性能监控方法因为仅仅依赖容易得到的过程数据,而不是依赖精确的数学模型,逐渐受到了广泛的关注。
本文在对传统统计过程监控方法的研究基础之上,提出了几种不同程度上的改进措施。进一步一些新的基于统计过程的监控方法被提出并运用。本文的主要内容如下:
1.提出基于小波包去噪主元分析方法的过程监控与故障诊断技术。该方法首先利用小波包变换技术,将测量噪声和干扰因素在过程数据中消除;其次利用主元分析法的特点,使过程数据得到降维,从而可建立主元监控模型;再次通过分析各变量对主元的贡献图,进行故障诊断。TE过程的仿真结果表明该方法在过程性能监控和故障诊断的有效性。
2.提出基于核主元分析方法的过程监控与故障诊断技术。该方法同样先利用小波包变换消除测量噪声和干扰。不同的是它采用核主元分析算法对故障进行在线检测。进一步运用核函数梯度算法对检测得到的故障实现在线故障诊断,从而可根据每个监控变量对相关统计量的不同贡献程度,绘制出贡献图,在贡献图的基础上实现故障分离。最后引入特征向量选择方法,使得监控过程中的核矩阵计算困难问题得到较好解决。通过对TE过程的仿真研究,并与主元分析法相比,实验结果表明该方法能有效实现故障检测和诊断,更高的过程监控能力得到突显。
3.利用核主元分析非线性过程监控的优势,结合多重核学习支持向量机在故障诊断方面的准确性,提出了基于核主元分析和多重核学习支持向量机的非线性过程监控和故障诊断方法。运用核主元法对数据进行处理,在特征空间构建监控变量和控制置信限,实现故障检测,若有故障发生,则计算样本的非线性主元得分向量,将其作为多重核学习支持向量机的输入值,通过其分类进行故障类型识别。将上述方法用于TE化工过程,仿真结果表明该方法能够准确快速地检测并诊断故障。
4.为了进一步提高故障诊断的速度和准确度,提出了基于核主元分析和无约束优化的稀疏型支持向量机的过程监控与故障诊断方法,首先利用核主元分析方法来检测故障,再利用Cholesky分解更新无约束优化中的Hessian矩阵构建稀疏型支持向量机,对TE过程的故障进行识别。仿真结果表明该方法能够准确快速地检测并诊断故障。
5.在分析复杂工业过程特点基础之上,充分利用核主元分析方法具有处理非线性数据的优势,以及独立成分分析方法具有较强提取高维特征空间信息能力的特点,提出基于核独立成分分析方法和支持向量机的非线性性能监控和故障诊断方法。该方法关键的步骤是先对数据作空间映射变换到高维特征空间;其次在高维特征空间中运用独立主元方法进行相关分析和计算。该方法借助在高维特征空间建立监控统计量和控制置信限的办法实现工业过程的监控。在实现过程监控的基础上,引入支持向量机,利用支持向量机优良的数据分类能力,实现故障诊断。TE过程仿真研究验证了该方法的有效性。
6.提出基于核独立成分分析和核Fisher判别分析的过程监控与故障诊断方法。该方法充分运用核学习理论,把核方法与线性Fisher判别分析方法有机地结合起来:通过利用核独立成分分析建立正常工况模型,得到检测故障信息。在发生故障的情况下,利用Fisher判别分析方法在高维的特征空间的特点和优势,可将满足最大分离程度的核Fisher判别向量和特征向量求出。从而根据当前故障的判别向量和历史故障数据集中所含故障的最优核Fisher判别向量的相似度进行故障诊断。通过对TE过程的仿真研究,验证了所提方法的有效性。
How to ensure safety, enhance the quality of products and the overall economic benefit are the critical problem in the process of modern industrial. An effective of technical method to solve the problem is the application of effective process performance monitoring and fault diagnosis. The rapid development of the computer and information technology made that a large number of process data of industrial have been sampled and collected. Since the methods of statistical performance monitoring rely only on readily available process data and do not assume accurate mathematical model, they have been paid more attention.
In this paper, some improvements of traditional methods have been made which based on the research of traditional statistical process monitoring method, and furthermore some new statistical monitoring methods are proposed too. The dissertation includes following main contents:
1. A new method combined wavelet packet transform (WPT) with principal component analysis (PCA) for process monitoring is proposed. Firstly, the method use WPT technology to restrain the noise and disturbance that contained in the process data effectively. And then the PCA technology is used to reduce the dimension of the process data and establish principal component (PC) model for monitoring. The contribution plots which represent the contribution of each monitoring variable to the PC are used for fault diagnosis. The monitoring results of the application to the Tennessee Eastman (TE) chemical process confirm its effectiveness.
2. A new fault detection and diagnosis method based on kernel principal component analysis (KPCA) is described. Firstly, it removes the noise from data set using WPT. The difference is that the new method here using KPCA to detect fault. And furthermore kernel function gradient algorithm is used to diagnosis fault. KPCA contribution plots are protracted which represent the contribution of each monitoring variable to the statistics. During the monitoring process, the feature vector selection method scheme is given to reduce the computation complexity of kernel matrix. The proposed method is applied to the simulation of Tennessee Eastman (TE) chemical process. The monitoring results confirm that the proposed method can effectively detect faults and diagnoses faults.
3. Using the advantage of KPCA for nonlinear monitoring and introducing the accuracy of multiple kernel learning support vector machines (MKL-SVM) for fault diagnosis, a new method for nonlinear process monitoring based on KPCA and MKL-SVM is proposed. The data is analyzed using KPCA. In the feature space, through constructing the statistical index and control limit, performance monitoring is implemented. T2 and SPE are constructed in the future space. If statistical index exceed the predefined control limit, a fault may have occurred .Then the nonlinear score vectors are calculated and fed into the MKL-SVM to identify the faults. The proposed method is applied to the simulation of Tennessee Eastman(TE)chemical process .The simulation results show that the proposed method can identify various types of faults accurately and rapidly.
4. To further improve the diagnosis speed and accuracy, a new method for nonlinear process monitoring based on KPCA and sparse SVM is proposed. The data is analyzed using KPCA. Through constructing the statistical index and control limit in the feature space, performance monitoring is implemented. If statistical index exceed the predefined control limit, a fault may have occurred. Then the nonlinear score vectors are calculated and fed into the sparse SVM to identify the faults. The proposed method is applied to the simulation of Tennessee Eastman(TE)chemical process. The simulation results show that the proposed method can identify various types of faults accurately and rapidly.
5. On the analysis of the characteristics of complex industrial processes basis, making full use of advantage of kernel principal component analysis method which could dealing with nonlinear data and the ability of kernel independent component analysis (KICA) to extraction high-dimensional feature space information, a new nonlinear performance monitoring and fault diagnosis method based on kernel independent component analysis (KICA) and SVM is proposed. The key of this method is map the data into high-dimensional feature subspace. And then analysis and computation can be done using the KICA algorithm. In the feature space, with the help of constructing the statistical index and control limit, the performance monitoring is implemented. SVM with the capacity of data classification are used to diagnosis the process fault. The effectiveness of this new method is confirmed by the application to the Tennessee Eastman (TE) chemical process.
6. A new statistical process monitoring and fault diagnosis method having the character of nonlinear which based on KICA and kernel FDA (KFDA) is proposed. Kernel learning theory is introduced into linear fisher discriminant analysis (FDA). KICA is used to establish the normal operating conditions and detect the fault. If a fault occurs, the nuclear fisher discriminant vector and feature vector F of the process data are extracted from the Fisher subspace. Thus, the batch normal or not can be detected by comparing distance with the predefined threshold. Comparing the present discriminant vector and the optimal discriminant vector of fault in historical data set, the similar degree can be detected. According to the similar degree, the perform fault can be diagnosed. The results of simulating TE process demonstrate that the proposed method can efficient in detecting and diagnosing the malfunctions,with more accurate result.
引文
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