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第三十四届中国控制会议

作者： Yu Zhaoxu Li Shugang Li Fangfei Key Laboratory of Advanced Control and Optimization for Chemical Process of Ministry of Education East China University of Science and Technology Department of Industrial Engineering and Logistics Shanghai Jiao Tong University Department of Mathematics East China University of Science and Technology

ISBN: (纸本)9789881563897

The problem of output feedback adaptive stabilization is addressed for a class of stochastic nonlinear systems with unknown time-varying delays and unknown control directions in this paper. Firstly, the unknown control coefficients are lumped together by using a linear state transformation, and the original system is transformed into a new system for which control design becomes feasible. Then, after the design of a novel neural observer, an output feedback adaptive neural network(NN) controller is developed for such systems by combining the Dynamic Surface control(DSC) technique, the Nussbaum gain function(NGF)method and the Lyapunov-Krasovskii method. The proposed controller ensures that all signals in the closed-loop systems are bounded in probability. Finally, a simulation example is given to verify the effectiveness and applicability of the proposed control design.

关键词： Stochastic systems,output feedback,neural network(NN),unknown control direction,time-varying delay

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Structural identifiability analysis of the Anaerobic Digestion Model No. 1 using a local algebraic observability approach

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IFAC-PapersOnLine 2015年第1期48卷 470-475页

作者： Joost Lauwers Philippe Nimmegeers Filip Logist Jan Van Impe KU Leuven Department of Chemical Engineering Chemical and Biochemical Process Technology and Control (BioTeC) W. de Croylaan 46 B-3001 Leuven Belgium.

Structural identifiability is a prerequisite for a successful parameter estimation of a dynamical model. ‘Structural’ relates to the theoretical possibility of estimating the parameters under the idealized conditions that all measurements are perfect and continuous, and that the model is a perfect representation of the real process. In this research, the Anaerobic Digestion Model No. 1 (ADM1) is analysed. The model is of great importance in anaerobic digestion modelling. Due to its numerous parameters, however, its structural identifiability is an open question. The used method investigates the local algebraic observability, which is a sufficient condition for structural local identifiability. Different measurement scenarios were tested, as well as the influence of the choice of inputs. The obtained results are optimistic, since in most conditions, nearly all of the initial conditions of the states and the kinetic, stoichiometric and composition parameters are found to be structurally locally identifiable if almost any one of the states is measured. Unidentifiability occurs for the parameters pertaining to inerts and the cations and anions. For these parameters, nevertheless, structurally identifiable parameter combinations are found.

关键词： Identifiability Observability Parameter Estimation Dynamic modelling ADM1

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Neural-observer-based adaptive control for stochastic nonlinear time-delay systems with unknown control directions 34

Neural-observer-based adaptive control for stochastic nonlin...

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34th Chinese control Conference, CCC 2015

作者： Zhaoxu, Yu Shugang, Li Fangfei, Li Key Laboratory of Advanced Control and Optimization for Chemical Process of Ministry of Education East China University of Science and Technology Shanghai China Department of Industrial Engineering and Logistics Shanghai Jiao Tong University Shanghai China Department of Mathematics East China University of Science and Technology Shanghai China

ISBN: (纸本)9789881563897

The problem of output feedback adaptive stabilization is addressed for a class of stochastic nonlinear systems with unknown time-varying delays and unknown control directions in this paper. Firstly, the unknown control coefficients are lumped together by using a linear state transformation, and the original system is transformed into a new system for which control design becomes feasible. Then, after the design of a novel neural observer, an output feedback adaptive neural network (NN) controller is developed for such systems by combining the Dynamic Surface control (DSC) technique, the Nussbaum gain function (NGF) method and the Lyapunov-Krasovskii method. The proposed controller ensures that all signals in the closed-loop systems are bounded in probability. Finally, a simulation example is given to verify the effectiveness and applicability of the proposed control design. © 2015 Technical Committee on control Theory, Chinese Association of Automation.

关键词： neural network (NN) output feedback Stochastic systems time-varying delay unknown control direction

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Nonlinear process Monitoring Based on Robust Auto-Encoder Model

Nonlinear Process Monitoring Based on Robust Auto-Encoder Mo...

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第26届中国过程控制会议（CPCC2015）

作者： Li Jiang Zhihuan Song Junghui Chen State Key Laboratory of Industrial Control Technology Institute of Industrial Process Control Department of Control Science and Engineering Zhejiang University Department of Chemical Engineering Chung-Yuan Christian University

Previous work on process monitoring has shown that process nonlinearity can be overcome by neural networks(NN) model. But it's difficult to train a NN model that has good generalization capabilities in process monitoirng. In this paper, a NN model called Auto-Encoder(AE) is introdued to model the process behavior, then a robust training method is proposed based on the idea of making the learned model robust to the noisy training *** analysis shows that the proposed Robust Auto-Encoder(RAE) is equal to a regularized AE which can capture nonlinear variations in the training data. Based on this, a corresponding statistic is introduced for *** case studies are provided for performance evaluation of the proposed method.

关键词： process Monitoring Fault Detection Robust Auto-Encoder

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The Voidage in a CFB Riser as Function of Solids Flux and Gas Velocity

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Procedia engineering 2015年 102卷 1112-1122页

作者： Huili Zhang Jan Degrève Jan Baeyens Raf Dewil KU Leuven Department of Chemical Engineering Chemical and Biochemical Process Technology and Control Section De Croylaan 46 Heverlee 3001 Belgium University of Warwick School of Engineering Coventry CV4 7AL United Kingdom KU Leuven Department of Chemical Engineering Process and Environmental Technology Lab J. De Nayerlaan 5 Sint-Katelijne-Waver 2860 Belgium

Circulating Fluidised Beds (CFBs) are widely applied in the process industry, for mostly gas-solid and gas-catalytic reactions. The riser is the key component of the CFB being the process reactor. The important design parameters are the operating gas velocity (U) and the solids concentration flux (G). The CFB operation starts at moderate to high superficial gas velocities. Its voidage exceeds ∼ 0.9 and is a function of the solids circulation flux. Different flow modes have been presented in literature, and result in an operation diagram where G and U delineate specific operations, from dilute riser flow, through core-annulus flow, to dense riser upflow (mostly at any U, G exceeding 80 to 120 kg m -2 s -1 ). Increasing G whilst maintaining the gas velocity will cause an increase in suspension concentration. The riser flow can hence be characterized by its apparent voidage, ɛ. In the core-annulus operation, clusters of particles reflux near the wall, thus influencing the local radial voidage in the cross section of the riser, and also extending over a given distance, δ, from the wall to the core . Through measurements in CFBs of 0.1 and 0.14 m I.D., the research has been able to determine the average axial and radial voidages of the dense phase within the different regimes, whilst also determining the thickness of the annulus (in CAF-mode). Experimental results will be illustrated and compared with previous empirical equations, shown to have a limited accuracy only both for ɛ, and for the thickness of the annulus in CAF operation. Within the operating conditions tested, results demonstrate that the annulus thickness is about 15 to 20% of the riser diameter in CAF, and that the voidage in the riser is a function of U and G, with riser diameter and distance along the riser length as secondary parameters.

关键词： circulating fluidized bed riser voidage annulus thickness

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A chamber study on the emission factors of gaseous and particulate pollutant of mosquito repellents incense 11

A chamber study on the emission factors of gaseous and parti...

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11th International Conference on Industrial Ventilation, Ventilation 2015

作者： Zhu, Chun Wang, Lina Li, Jingguang Zhang, Yalei College of Environmental Science and Engineering Tongji Unversity Shanghai China Department of Green City and Environment Shanghai Research Institute of Building Science Shanghai China State Environmental Protection Key Laboratory of Environmental Risk Assessment and Control on Chemical Process East China University of Science and Technology Shanghai China

Constant Injection Method was applied in a full scale air quality experimental chamber to obtain the emission factors (EFs) of PM2.5 and other gaseous pollutants produced from the burning process of disc solid mosquito-repellent incense, electric liquid mosquito-repellent incense and electric mat mosquito-repellent incense, respectively. Results showed that PM2.5 EFs of above three types of mosquito-repellent incense were 10.8 mg/h, 1.1 mg/h, 2.2 mg/h, respectively. The corresponding values of TVOC EFs were 103.4 mg/h, 69.5 mg/h and 58.8 mg/h, respectively. Via implementation of fitting analysis to particle size distribution (PSD) of released particles from disc solid mosquito-repellent incense, it was found that the PSD kept a well self-preservation signature. In addition, the fitting results showed that count median diameter (CMD) was 90 nm, geometric standard deviation (GSD) was 1.65. The emission factors of particle number were obtained via using mass concentration EFs and the corresponding PSD modeling results. In addition, modeling was conducted in a common residential house with air change rate of 2 h-1, each type of mosquito-repellent incense would cause TVOC concentration raising up with a factor of 1.8-3.2 times greater compared to the relative indoor air standards.

关键词： Particle size analysis

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Design of the integrated solid oxide fuel cell and molten carbonate fuel cell system to reduce carbon dioxide emissions

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chemical engineering Transactions 2015年 43卷 2191-2196页

作者： Jienkulsawad, Prathak Saebea, Dang Patcharavorachot, Yaneeporn Arpornwichanop, Amornchai Computational Process Control Research Unit Department of Chemical Engineering Faculty of Engineering Chulalongkorn University Bangkok10330 Thailand Department of Chemical Engineering Faculty of Engineering Burapha University Chonburi20131 Thailand School of Chemical Engineering Faculty of Engineering King Mongkut's Institute of Technology Ladkrabang Bangkok10520 Thailand

ISBN: (纸本)9788895608341

In general, a solid oxide fuel cell (SOFC) based on an internal reforming operation cannot be run with complete fuel utilization;therefore, the remaining fuel needs to be effectively handled. Furthermore, the SOFC exhaust gas still contains carbon dioxide, which is the primary greenhouse gas, and searching for the way to utilize this carbon dioxide is important. A molten carbonate fuel cell (MCFC) appears to be a potential technology to mitigate the emissions of carbon dioxide. In this study, the performance of the integrated SOFC and MCFC system is analyzed. The SOFC is considered a main power generation and the MCFC is regarded as a carbon dioxide concentrator along with producing electricity as a by-product. Mathematical models of the SOFC and MCFC are based on one-dimensional mass balances taking into all various cell voltage losses under steady-state and isothermal conditions. Primary operating conditions of the integrated fuel cell system that affects the system efficiencies in terms of power generation and reduction in the carbon dioxide emission are discussed and its optimal operation is identified based on these criteria. Effect of carbon dioxide recirculation on the system is also studied. Various configurations of the integrated SOFC-MCFC system are proposed and compared to determine the suitable design of the integrated fuel cell system. Copyright © 2015, AIDIC Servizi S.r.l.

关键词： Carbon dioxide

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Set-Theoretic Approaches in Analysis, Estimation and control of Nonlinear Systems

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IFAC-PapersOnLine 2015年第8期48卷 981-995页

作者： Benoit Chachuat Boris Houska Radoslav Paulen Nikola Peri'c Jai Rajyaguru Mario E. Villanueva Centre for Process Systems Engineering Department of Chemical Engineering Imperial College London South Kensington Campus London SW7 2AZ UK Process Dynamics and Operations Group Department of Biochemical and Chemical Engineering Technische Universitöat Dortmund Emil-Figge-Str. 70 44221 Dortmund Germany School of Information Science and Technology ShanghaiTech University 319 Yueyang Road Shanghai 200031 China

This paper gives an overview of recent developments in set-theoretic methods for nonlinear systems, with a particular focus on the activities in our own research group. Central to these approaches is the ability to compute tight enclosures of the range of multivariate systems, e.g. using ellipsoidal calculus or higher-order inclusion techniques based on multivariate polynomials, as well as the ability to propagate these enclosures to enclose the trajectories of parametric or uncertain differential equations. We illustrate these developments with a range of applications, including the reachability analysis of nonlinear dynamic systems; the determination of all equilibrium points and bifurcations in a given state-space domain; and the solution of set-membership parameter estimation problems. We close the paper with a discussion about on-going research in tube-based methods for robust model predictive control.

关键词： affine-set parameterization differential equations reachable set bifurcation analysis set-membership estimation

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Application of Computer Aided Tools and Methods for Unmanned Cargo Aircraft Design

Application of Computer Aided Tools and Methods for Unmanned...

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International Conference on Methods and Models in Automation and Robotics

作者： Roman Czyba Michal Hecel Karol Jabloński Marcin Lemanowicz Krzysztof Platek Department of Automatic Control Faculty of Automatic Control Electronics and Computer Science Department of Chemical Engineering and Process Design Faculty of Chemistry Faculty of Mechanical Engineering Silesian University of Technology 16 Akademicka St. Gliwice 44-100 Poland

ISBN: (纸本)9781479987023

Nowadays, novel construction materials, more efficient power supplies and advanced artificial intelligence algorithms allow one to use unmanned aerial vehicles (UAV) in various fields of life. One of the biggest events promoting this idea is the Air Cargo Challenge (ACC) competition. In this paper the motivation for ACC participation and the overall procedure of CAD aided UAV design are presented. The nonlinear aircraft model as well as Computational Fluid Dynamic simulations are discussed. Finally, some details concerning designed UAV prototype are revealed.

关键词： UAV CAD CFD Rapid Prototyping

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Stability and L_2-gain Analysis of Periodic Piecewise Linear Systems

Stability and L_2-gain Analysis of Periodic Piecewise Linear...

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American control Conference

作者： Panshuo Li James Lam Yong Chen Kie Chung Cheung Yugang Niu Department of Mechanical Engineering The University of Hong Kong Pokfulam Road Hong Kong Key Laboratory of Advanced Control and Optimization for Chemical Process East China University of Science and Technology Shanghai China

ISBN: (纸本)9781479917730

This paper investigates the stability and L_2-gain problems for a class of continuous-time periodic piecewise linear systems with possibly non-Hurwitz subsystems. First, the exponential stability of periodic piecewise systems is studied by allowing the Lyapunov function to possibly non-monotonically decreasing over a period. A sufficient condition is established in terms of matrix inequalities. In light of the proposed Lyapunov function, the L_2-gain criterion is derived for periodic piecewise linear systems as well.

关键词： Piecewise Linear system Periodic Liapunov function linear matrix inequalities

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