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On the Application of PCA Technique to Fault Diagnosis

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Tsinghua science and Technology 2010年第2期15卷 138-144页

作者： ding s ZHANG P ding E YIN s Naik A DENG P GUI W Institute for Automatic Control and Complex systems (AKs) University of Duisburg-Essen 47057 Duisburg Germany Department of Physical Engineering University of Applied Sciences Gelsenkirchen 45877 Gelsenkirchen Germany school of Information science and Engineering Central South University Changsha 410083 China

In this paper, we bdefly address the application of the standard principal component analysis （PCA） technique to fault detection and identification. Based on an analysis of the existing test statistic, we propose a new test statistic, which is similar to the Hawkin＇s T2 H statistic but without the numerical drawback. In comparison with the sPE index, the threshold setting associated with the new statistic is computationally simpler. Our further study is dedicated to the analysis of fault sensitivity. We consider the off-set and scaling faults, and evaluate the test statistic by viewing its sensitivity to the faults. Our final study focuses on identifying off-set and scaling faults. To this end, two algorithms are proposed. This paper also includes some critical remarks on the application of the PCA technique to fault diagnosis.

关键词： process monitoring fault diagnosis principal component analysis (PCA) multivariate analysis

Data-Driven Process Monitoring and Fault Tolerant Control in Wind Energy Conversion system with Hydraulic Pitch system

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Journal of shanghai Jiaotong university(science) 2015年第4期20卷 489-494页

作者：王凯罗浩 KRUEGER M ding s X 杨旭 JEDsADA s Institute for Automatic Control and Complex systems University of Duisburg-Essen Baotou Vocational & Technical Collage school of Automation and Electrical Engineering University of Science and Technology Beijing Department of Electrical Engineering Faculty of Engineering Burapha University

Wind energy is one of the widely applied renewable energies in the world. Wind turbine as the main wind energy converter at present has very complex technical system containing a huge number of components,actuators and sensors. However, despite of the hardware redundancy, sensor faults have often affected the wind turbine normal operation and thus caused energy generation loss. In this paper, aiming at the wind turbine hydraulic pitch system, data-driven design of process monitoring(PM) and diagnosis has been realized in the wind turbine benchmark. Fault tolerant control(FTC) strategies focused on sensor faults have also been presented here, where with the implementation of soft sensor the sensor fault can be handled and the performance of the system is improved. The performance of this method is demonstrated with the wind turbine benchmark provided by Math Works.

关键词： data-driven process monitoring(PM) fault tolerant control(FTC) soft sensor wind turbine

Prediction of flow patterns during silo discharges using a finite element approach and its preliminary experimental verification

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Particuology 2015年第1期13卷 42-49页

作者： s.ding H.Li J.Y.Ooi J.M.Rotter Faculty of science and Engineering University of AgderGrimstadand Tel-TekPorsgrunnNorway school of Material & Mineral Resources Xi'an University of Architecture & Technology Institute for Infrastructure and Environment School of EngineeringUniversity of Edinburgh

Obtaining a reliable discharge of particulate solids from a storage silo is a prerequisite to securing oper- ational adequacy in solids handling processes. If a silo is poorly designed, an unreliable interrupted discharge often occurs. In this study, an in-house finite element （FE） program was modified to predict the particulate solids flow patterns during discharges from silos, and the effect of a double-cone insert on such flow patterns. In FE modeling, a Eulerian approach was adopted with an assumption of steady-state flow-a state that greatly facilitated investigations on the effects of double-cone inserts on the flow of particulate solids. Predictions were carried out on whether the discharge was in mass flow or funnel flow, associated with the inclination angle of the silo＇s hopper. Predicted results were in agreement with the Jenike Chart, and proved that an upper lateral pressure ratio value gave a better critical hopper half angle to achieve mass flow （EN 1991-4, 2006）. The shape and size of the stagnant zone were further discussed to address the flow channel boundary between the flowing and static solids if the discharge was in a funnel pattern. Results also showed the effects of a double-cone insert on the flow patterns which con- verted silos from funnel flow to mass flow up to a certain hopper inclination angle and would improve the flow pattern even for shallower angles. Experiments were carried out to verify some of the predicted results. some qualitative comparisons were made between the predicted results and experimental mea- surements, which indicated that further efforts are needed in predicting the shape of the stagnant zone （flow channel boundary） during funnel flow discharges.

关键词： Discharge pattern Flow boundary Double-cone insert FE analysis Preliminary verification

MICROsTRUCTURE AND TENsILE PROPERTIEs OF Fe_3Al-BAsED ALLOYs WITH VC AND TiC ADDITIONs

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Acta Metallurgica sinica(English Letters) 2001年第4期14卷 248-252页

作者： W.L. Xu, Y.s. sun and s.s. ding Department of Materials science & Engineering, southeast University, Nanjing 210096, China Dept. of Mat. sci. Southeast Univ. Nanjing 210096 China

Microstructure and tensile properties of Fe3 Al-based alloys with the additions of TiC and VC particles have been investigated. Results show that the formation of TiC particles results in the refinement of the macrostructure of as-cast ingots. Although the addition of VC particles does not cause any significant change of the as-cast microstructure, the microstructure of the alloy after hot-working and recrystallization has been found to be refined. The formation of both VC and TiC particles results in the increase of yield strength, especially at the high temperature of 600°C.

关键词： Aluminum alloys Doping (additives) Microstructure Tensile strength Titanium carbide

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一种故障检测滤波器的多目标优化设计方法

控制与决策 2005年第7期20卷 773-777页

作者：彭涛桂卫华 ding s X 谢勇中南大学信息科学与工程学院长沙410083 杜伊斯堡-埃森大学自动控制和复杂系统研究株洲工学院电气工程系湖南株洲412008

提出一种基于观测器的故障检测滤波器的非凸多目标优化设计方法.针对线性时不变动态系统,构建一个由输出观测器和后滤波器组成的故障检测滤波器,将其残差动态特性描述为非凸的双线性矩阵不等式形式.利用双线性矩阵不等式中可完全平方非... 详细信息

提出一种基于观测器的故障检测滤波器的非凸多目标优化设计方法.针对线性时不变动态系统,构建一个由输出观测器和后滤波器组成的故障检测滤波器,将其残差动态特性描述为非凸的双线性矩阵不等式形式.利用双线性矩阵不等式中可完全平方非正定项的上界替代原非正定项,将双线性矩阵不等式转化为一组线性矩阵不等式,进而获得多目标优化问题的可解条件以及观测器增益与后滤波器矩阵的求解方法.仿真算例说明了算法的有效性.

关键词：基于观测器故障检测后滤波器多目标优化双线性矩阵不等式线性矩阵不等式

Critical Factors Dictating Reversibility of the Zinc Metal Anode

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Energy & Environmental Materials 2020年第4期3卷 516-521页

作者： Lin Ma Marshall A.schroeder Travis P.Pollard Oleg Borodin Michael s.ding Ruimin sun Longsheng Cao Janet Ho David R.Baker Chunsheng Wang Kang Xu Energy&Biotechnology Division Sensors and Electron Devices DirectorateUS Army Research LaboratoryAdelphi MD USA Department of Chemical and Biomolecular Engineering University of MarylandChemCollege Park 20742MD USA

With high energy density and improved safety,rechargeable battery chemistries with a zinc(Zn)metal anode offer promising and sustainable alternatives to those based on lithium metal or lithium-ion intercalation/alloying anode materials;however,the poor electrochemical reversibility of Zn plating/stripping,induced by parasitic reactions with both aqueous and non-aqueous electrolytes,presently limits the practical appeal of these *** recent efforts in rechargeable Zn metal batteries(RZMBs)have achieved certain advancements in Zn metal reversibility,as quantified by the Coulombic efficiency(CE),a standard protocol for CE has not been established,and results across chemistries and systems are often *** importantly,there is still an insufficient understanding regarding the critical factors dictating Zn *** this work,a rigorous,established protocol for determining CE of lithium metal anodes is transplanted to the Zn chemistry and is used for systematically examining how a series of factors including current collector chemistry,current density,temperature,and the upper voltage limit during stripping affect the measured reversibility of different Zn *** support from density functional theory calculations,this standardized Zn CE protocol is then leveraged to identify an important correlation between electrolyte solvation strength toward Zn2+and the measured Zn CE in the corresponding electrolyte,providing new guidance for future development and evaluation of Zn electrolytes.

关键词： Coulombic efficiency rigorous protocol Zn ion solvation Zn metal anode

Effect of Feeding Rate on the Loads Measured Along the Wall of a Full-scale Hopper During Filling

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Effect of Feeding Rate on the Loads Measured Along the Wall ...

模型不确定性线性系统的鲁棒故障检测滤波器设计(英文)

The sixth International Conference on Measurement and Control of Granular Materials

作者： s.ding G.G.Enstad Tel-Tek Dept.POsTEC Telemark University CollegePorsgrunnNorway

It has been shown that the filing method affects the loads along the wall of a container such as a silo when it is filled with granular *** issue has been addressed by comparing a concentric with a distributed filling as representative examples of filling *** effect of the filling rate on the load along the wall of a conical full-scale hopper was examined during a concentric *** order to measure the loads,seven pressure transducers were mounted at given positions on the hopper wall. sand was filled axi-symmetrically into the hopper at different rates,and the loads during filling on the wall were measured *** kinds of surface flow movement were categorically seen in the process of piling-up. The distribution of the filling loads along the wall developed differently under different feeding rates at the end of *** cause of such differences was explored to some *** was found that the loads measurement made on one line along the hopper as carried out in the present study was only a chance sample value, and appeared to be higher when the feeding rates were higher.

关键词： Hopper filling loads measurement feeding rate

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控制理论与应用 2003年第5期20卷 788-792页

作者：钟麦英张承慧 ding s X 山东大学控制科学与工程学院山东济南250061 德国Duisburg大学自动化与复杂系统研究所

基于给定的性能指标函数 ,将受模型不确定性和范数有界未知输入影响的线性不确定系统的基于观测器的鲁棒故障检测滤波器设计问题归结为H∞ 优化问题 ,并通过选取适当的后置滤波器和观测器增益矩阵 ,使产生的残差达到对于未知输入和模型... 详细信息

基于给定的性能指标函数 ,将受模型不确定性和范数有界未知输入影响的线性不确定系统的基于观测器的鲁棒故障检测滤波器设计问题归结为H∞ 优化问题 ,并通过选取适当的后置滤波器和观测器增益矩阵 ,使产生的残差达到对于未知输入和模型不确定性的鲁棒性与对于故障的灵敏度的最佳均衡 .简例验证了本文提出算法的有效性 .

关键词：模型不确定性线性系统鲁棒性故障检测滤波器设计

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采样数据系统故障检测的H_∞方法

控制理论与应用 2003年第3期20卷 361-366页

作者：张萍 ding s X 王桂增周东华清华大学自动化系北京100084 杜伊斯堡大学自动控制和复杂系统研究所

提出一种对采样数据系统进行故障检测的H_∞方法。首先构造离散时间故障检测系统,分析残差产生器的动态特性。然后从故障检测的角度引入算子,定量考察连续时间未知输入信号和故障信号对离散时间残差信号的影响。最后优化残差产生器的参... 详细信息

提出一种对采样数据系统进行故障检测的H_∞方法。首先构造离散时间故障检测系统,分析残差产生器的动态特性。然后从故障检测的角度引入算子,定量考察连续时间未知输入信号和故障信号对离散时间残差信号的影响。最后优化残差产生器的参数,使得故障检测系统对未知输入具有较强的鲁棒性,同时对故障具有较高的灵敏度。

关键词：采样数据系统故障检测 H∞方法数字控制器残差产生器鲁棒性灵敏度