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Applications of Sliding Observers for FDI in Aerospace systems

12th IEEE International Workshop on Variable Structure System, VSS 2012

作者： Edwards, Christopher Alwi, Halim Menon, Prathyush P. Center for Systems Dynamics and Control CEMPS University of Exeter United Kingdom Control and Instrumentation Group Department of Engineering University of Leicester United Kingdom Center for Systems Dynamics and Control Mathematical Research Institute University of Exeter United Kingdom

ISBN: (纸本)9783642369858

This chapter presents applications of second order sliding mode observer schemes to three different aerospace problems. Two relate to ADDSAFE aircraft fault detection benchmark problems. Firstly, the detection and isolation problem associated with an actuator jam/runaway is considered and secondly an actuator oscillatory failure case is tackled. For the actuator jam/runaway scenario the actuator deflection becomes decoupled from the demand issued from the flight control computer and either remains fixed at some uncommanded point or 'runs away' to an extreme value. For the OFC problem, the reconstruction scheme requires an estimate of rod speed provided by a second order sliding mode observer. Ideally low gains in the observer are required because of the noisy environment associated with the physical system. An adaption scheme is therefore required to retain sliding in the presence of severe faults. A problem associated with fault detection in a formation flying scenario, associated with satellites is also discussed. This application to a relative degree two problem would be difficult to solve using linear observer methods. © Springer-Verlag Berlin Heidelberg 2013.

关键词： Actuators

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Setpoints Compensation in Industrial Processes via Multirate Output Feedback control

Setpoints Compensation in Industrial Processes via Multirate...

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9th Asian control Conference (ASCC)

作者： Yin, Shen Liu, Fangzhou Gao, Huijun Qiu, Jianbin Chai, Tianyou Fan, Jialu Karimi, Hamid Reza Research Institute of Intelligent Control and Systems Harbin Institute of Technology Harbin 150080 China State Key Laboratory for Synthetical Automation of Process Industries Northeastern University Shenyang 110004 China Department of Engineering University of Agder Grimstad N-4898 Norway

ISBN: (纸本)9781467357692;9781467357678

This paper investigates the setpoints compensation for a class of complex industrial processes. Plants at the device layer are controlled by the local regulation controllers, and a multirate output feedback control approach for setpoint compensation is proposed such that the subsystems can reach the dynamically changed setpoints and the given economic objective can also be tracked via certain economic performance index (EPI). First, a sampled-data multivariable direct output feedback proportional integral (PI) controller is designed to regulate the performance of the subsystems. Second, the outputs and control inputs of the plants at the device layer are sampled at operation layer sampling time to form an EPI. Thus the multirate problem is solved by a lifting method. Third, static setpoints are generated by real time optimization (RTO) and the dynamic setpoints are calculated by the compensator according to the error between the EPI and objective at each operation layer step. Finally, a rougher flotation process model is employed to demonstrate the effectiveness of the proposed method.

关键词： PI control compensation complex networks control system synthesis feedback multivariable control systems optimisation process control sampled data systems

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Nonlinear analysis of dynamical complex networks 2014

Abstract and Applied Analysis

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Abstract and Applied Analysis 2014年第SI42期2014卷 1-4页

作者： Wang, Zidong Shen, Bo Dong, Hongli Hu, Jun He, Xiao Ding, Derui Department of Computer Science Brunel University Uxbridge Middlesex UB8 3PH United Kingdom Communication Systems and Networks (CSN) Research Group Faculty of Engineering King Abdulaziz University Jeddah 21589 Saudi Arabia School of Information Science and Technology Donghua University Shanghai 200051 China College of Electrical and Information Engineering Northeast Petroleum University Daqing 163318 China Research Institute of Intelligent Control and Systems Harbin Institute of Technology Harbin 150001 China Department of Applied Mathematics Harbin University of Science and Technology Harbin 150080 China Department of Automation Tsinghua University Beijing 100084 China Department of Applied Mathematics Anhui Polytechnic University Wuhu 241000 China

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control Lyapunov function based feedback design for quasi-polynomial systems

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IFAC Proceedings Volumes 2013年第23期46卷 128-133页

作者： Attila Magyar Katalin M. Hangos Department of Electrical Engineering and Information Systems University of Pannonia Veszprém Hungary Process Control Research Group Computer and Automation Research Institute HAS Budapest Hungary

The aim of this work is to present an entropy-like Lyapunov function based dynamic feedback design technique for quasi-polynomial and Lotka-Volterra systems. It is shown, that the dynamic feedback design problem is equivalent to the feasibility of a bilinear matrix inequality. The problem is also formulated as a control Lyapunov function based feedback design when the Lyapunov function parameters are given, the solution of this problem can be obtained by solving a linear matrix inequality. The developed method is illustrated on a simple numerical example.

关键词： Lyapunov stability nonlinear systems stabilizing feedback dynamic feedback optimization problems

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O-glycan profiling of serum glycan for potential renal cancer biomarkers

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Science China(Life Sciences) 2013年第8期56卷 739-744页

作者： GAO Yi MA Fei ZHANG Wei ZHONG Fan TANG HaiLin XU DanFeng ZHAO Liang Department of Urology Changzheng Hospital of Second Military Medical University State Key Laboratory of Proteomics Beijing Proteome Research CenterBeijing Institute of Radiation Medicine Shanghai Key Laboratory of Functional Materials Chemistry School of Chemistry and Molecular EngineeringEast China University of Science and Technology Department of Automatic Control College of Mechatronics and AutomationNational University of Defense Technology Laboratory of Systems Biology Institutes of Biomedical SciencesFudan University

Serum was obtained from 25 male renal cell carcinoma(RCC) patients and 21 healthy males.O-glycans were released by a-elimination reaction and purified by graphitized carbon cartridge solid phase extraction,then profiled by matrix-assisted laser desorption/ionisation-time of flight mass *** noise removal and peak alignment,1372 peaks were extracted from 200000 data *** peaks were analyzed by calculation of differential sensitivity and *** combination of two feature peaks was chosen as a biomarker and could clearly differentiate RCC and normal samples in our study group.

关键词： mass spectrometry glycan renal cell carcinoma biomarkers

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Effects of Combinatorial Expression of selA, selB and selC Genes on the Efficiency of Selenocysteine Incorporation in Escherichia coli

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Chemical research in Chinese Universities 2013年第1期29卷 87-94页

作者： XU Ya-wei JIANG Zhi-hua MU Ying ZHANG Lei ZHAO Si-qi LIU Shu-jun WANG Cheng ZHAO Yang LU Shao-wu Key Laboratory for Molecular Enzymology and Engineering Ministry of Education Jilin University Changchun 130012 P. R. China Research Center for Analytical Instrumentation Institute of Cyber-Systems and ControlState Key Laboratory of lndustrial Control Technology Zhejiang University Hangzhou 310058 P. R. China Department of Bioengineering Jilin Agricultural Science and Technology College Jilin 132001 P. R. China Pulmonary Center School of Medicine Boston University Boston MA 02118 USA

In Escherichia coil four gene products（selA, selB, selC and selD） and a selenocysteine（Sec） insertion sequence（SECIS） are required for the correct translation of UGA codons encoding Sec. Previous studies have shown that the stoichiometry of selenoproteine mRNA and elongation factor SelB affect the efficiency of Sec incorporation. Herein lies a detailed analysis of the effects of co-expressing selA, selB and selC genes under inducible promoters on the incorporation efficiency of Sec. Over-expression of either selA or selB reduced the efficiency of Sec incorporation by 61.1% or 11.6%, respectively, compared to the over-expression of the reporter vector alone did. Concomitant over-expression ofselC with selA or selB completely reversed the reduce of the efficiency of Sec but still reduced the efficiency of the incorporation relative to that observed for expression of selC alone. Over-expression of selC gene alone under L-arabinose induction reduced the efficiency of the incorporation relative to that observed for co-expressing selC with selA and selB under the control of its endogenous promoter in the absence of L-arabinose. Co-expression of selA, selB and selC with selA or selB under the control of inducible promoters increased the effi- ciency of Sec incorporation by 69.7%. Moreover, inducing selenoprotein-related gene expression during the late exponential phase increased the efficiency of Sec incorporation by a factor of 5.4 relative to that observed for the reporter vector alone. These results suggest that the co-expression of selA, selB and selC in Escherichia coli under the control of inducible promoters is a viable and promising strategy for increasing the yields of selenoproteins.

关键词： Selenocysteine SelA SelB SelC Combinatorial expression

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Supervised DNA barcode species classification:analysis, comparison and results

Supervised DNA barcode species classification:analysis, comp...

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Firth International Barcode of Life Conference(第五届国际生命条形码大会)

作者： Emanuel Weitschek Giulia Fiscon Giovanni Felici Department of Computer Controland Management EngineeringSapienza UniversityItaly Institute of Systems Analysis and Computer ScienceNational Research CouncilItaly Department of Computer Science and Automation University Roma TreItaly Institute of Systems Analysis and Computer Science National Research CouncilItaly Institute of Systems Analysis and Computer ScienceNational Research CouncilItaly

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Realizing system poles identification on the unit disc based on Laguerre representations and hyperbolic metrics

Realizing system poles identification on the unit disc based...

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Mediterranean Conference on control and automation (MED)

作者： Alexandros Soumelidis József Bokor Ferenc Schipp Systems and Control Laboratory Computer and Automation Research Institute Hungarian Academy of Sciences Budapest Hungary MTA-BME Control Engineering Research Group Budapest University of Technology and Economics Budapest Hungary Department of Numerical Analysis Faculty of Informatics Eotvos Lorand University Budapest Hungary

ISBN: (纸本)9781479909964

In a series of paper the authors proposed a new frequency-domain approach to identify poles in discrete-time linear systems. The discrete rational transfer function is represented in a rational Laguerre-basis, where the basis elements are expressed by powers of the Blaschke-function. This function can be interpreted as a congruence transform on the Poincaré unit disc model of the hyperbolic geometry. The identification of a pole is given as a hyperbolic transform of the limit of a quotient-sequence formed from the Laguerre-Fourier coefficients. In this paper the opportunities of reliably computing the poles are analyzed, and some algorithms are proposed for practical use.

关键词： Convergence Estimation Transforms Transfer functions Measurement Geometry Hafnium

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Maximum Likelihood Estimation of diffusion and convection in tokamaks using infinite domains

Maximum Likelihood Estimation of diffusion and convection in...

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IEEE Conference on control Technology and Applications (CCTA)

作者： Matthijs van Berkel Gerd Vandersteen Hans Zwart Dick Hogeweij Marco de Baar Technische Universiteit Eindhoven Eindhoven Noord-Brabant NL Department of Fundamental Electricity and Instrumentation Vrije Universiteit Brussel Belgium Dept. of Mechanical Engineering Control Systems Technology group Eindhoven The Netherlands FOM institute DIFFER Dutch Institute for Fundamental Energy Research Association EURATOM-FOM Trilateral Euregio Cluster Nieuwegein The Netherlands

ISBN: (纸本)9781479915583

A new method to identify the spatial dependent parameters describing the heat transport, i.e. diffusion and convection, in fusion reactors is presented. These parameters determine the performance of fusion reactors. The method is based on local transfer functions, which are defined between two measurement locations. Estimation of the local transfer functions results in a model of the spatial dependent diffusion and convection. The parameters of the local transfer functions are estimated using Maximum Likelihood Estimation in the frequency domain. This is necessary, because both measurements (input and output of the transfer function) contain noise. Moreover, confidence bounds and validation tests can be used in this framework. Finally, experimental results are presented, which show that the diffusion and convection can be estimated. In this case, the uncertainty bounds are too large on the convection to conclude its presence.

关键词： Transfer functions Noise Temperature measurement Heating Tokamaks Uncertainty

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A new closed-loop identification based on relay feedback

A new closed-loop identification based on relay feedback

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16th International Conference on Mechatronics Technology, ICMT 2012

作者： Qiu, Liang Zhang, Kun Gu, Danying Yang, Dan Zhang, Weidong Department of Automation Shanghai Jiao Tong University Ministry of Education of China Shanghai China Department of Electric Instrumentation and Control Shanghai Nuclear Engineering Research and Design Institute Shanghai China

ISBN: (纸本)9787900769428

In this paper, a new identification method, derived from a closed-loop step test and feedback relay, is proposed. The distinctive feature of this proposed method is that this method can identify both stable first-order plus dead-time model (FOPDT) and unstable FOPDT which can approximate most practical industrial processes. A new estimation equation is derived and such a model can be obtained without any iteration. Furthermore, the proposed method has a great robustness when the process has large amounts of measurement noise. The performance of this identification method has been demonstrated through simulation.

关键词： Iterative methods

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