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9th IFAC Symposium on Fault Detection, Supervision and Safety for Technical processes, SAFEprocess 2015

作者： Pfeffer, Annett Urbas, Leon Department of Process Control Systems Engineering Technische Universität Dresden Germany

As an approach to cope with rising volatility of sales markets and increasingly shorter development cycles, process industries are expecting much from the concept of modularization. However, a topic that is still rarely focused in this context is safety. Therefore, this paper is focused on the expected challenges of engineering functional safety including the architectures of safety instrumented systems, and the requirements of modularization. Possible architectures are presented and discussed in relation to the requirements of functional safety in modular process plants. © 2015, IFAC (International Federation of Automatic control) Hosting by Elsevier Ltd. All rights reserved.

关键词： Safety engineering

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Optimal Management of Hydrogen in a Petrol Refinery

Optimal Management of Hydrogen in a Petrol Refinery

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European control Conference

作者： Elena G. Sayalero Daniel Sarabia Gloria Gutiérrez Sergio Mármol José Miguel Sola Carlos Pascual Rafael González Cesar de Prada Systems Engineering and Automation Department University of Valladolid Valladolid Mergelina building EII 47011 Spain Process Engineering/Advanced Control Departments Petroleos del Norte Petronor Muskiz Vizcaya 48550 Spain

ISBN: (纸本)9781509025923

A study of the optimal real-time management of hydrogen H_2 networks in an oil refinery has been carried out. The paper addresses the main problems related to the operation of the networks combining data reconciliation with a real-time optimization RTO system for the optimal production and redistribution of hydrogen. Coherent and robust results have been achieved regarding the data reconciliation stage despite all the uncertainty in measurements and process operation, according to the off-line validation performed. Once the network state has been estimated, a RTO approach was followed aiming at the real-time optimal operation of the global refinery H_2 network;an analysis of the solutions achieved was also performed.

关键词： Optimal Management Hydrogen Petrol Refinery

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Evaluation of control strategies for a semi batch copolymerization reactor

Evaluation of control strategies for a semi batch copolymeri...

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Indian control Conference (ICC)

作者： Reddi Kamesh Polumati Anand Kalipatnapu Yamuna Rani Academy of Scientific and Innovative Research (AcSIR) Chennai India Process Dynamics and Control Group Chemical Engineering Division CSIR-Indian Institute of Chemical Technology Hyderabad Telangana India

Polymerization processes are characterized by exothermic reactions with complicated nonlinear dynamics, especially in batch / semi-batch mode. The complexities of the polymerization kinetics and reactor behaviour pose difficult quality control problems. Therefore a control strategy that ensures an optimal as well as robust operation of polymerization reactors, under the influence of various disturbances control, is required to achieve the desired product specifications. It is extremely important to develop efficient methods for the synthesis of polymerization control strategies. In this work, the optimal target values of molecular weight and copolymer composition for a semi-batch styrene-acrylonitrile (SAN) copolymerization reactor are set as set point trajectories and are tracked by PI controllers. Two versions of PI control, namely two independent SISO controllers and multivariable PI controller are attempted in this study for control of molecular weight and copolymer composition using coolant temperature and inlet feeding flow rate as manipulated inputs. This approach overcomes the drawbacks of open loop optimal control implementation though handling of the effects of load disturbances as well as set point changes. The simulation results demonstrate the usability of this approach for online optimization and control.

关键词： Inductors Polymers Optimal control process control Feeds Temperature control Tuning

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Robust scheduling of a two-stage hybrid flow shop with uncertain interval processing times

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International Journal of Production Research 2016年第12期54卷 p3706-3717页

作者： Feng, Xin Zheng, Feifeng Xu, Yinfeng School of Management Xi'an Jiaotong University Xi'an China State Key Lab for Manufacturing Systems Engineering Xi'an China Ministry of Education Key Lab for Process Control and Efficiency Engineering Xi'an China Glorious Sun School of Business and Management Donghua University Shanghai P.R. China

This paper studies the makespan minimisation scheduling problem in a two-stage hybrid flow shop. The first stage has one machine and the second stage hasmidentical parallel machines. Neither the processing time nor probability distribution of the processing time of each job is uncertain. We propose a robust (min–max regret) scheduling model. To solve the robust scheduling problem, which is NP-hard, we first derive some properties of the worst-case scenario for a given schedule. We then propose both exact and heuristic algorithms to solve this problem. In addition, computational experiments are conducted to evaluate the performance of the proposed algorithms. [ABSTRACT FROM AUTHOR]

关键词： hybrid flow shop scheduling makespan minimisation min–max regret min–max regret uncertain processing times

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Cultivation of three microalgae strains under mixotrophic conditions for biodiesel production

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Chemical engineering Transactions 2016年第期50卷 409-414页

作者： Rios, Luisa F. Da Silva Soares, Carla Tasić, Marija B. Maciel, Maria R. Wolf Filho, Rubens Maciel University of Campinas Chemical Engineering Faculty Laboratory of Optimization Design and Advanced Process Control-Bioen Division Av. Albert Einstein 500 Campinas SP Brazil Faculty of Technology University of Niš Bulevar oslobodjenja 124 Leskovac16000 Serbia

ISBN: (数字)9788895608419

ISBN: (纸本)9788895608419

Microalgal biomass have a potential to be used as feedstock for biodiesel production because of high photosynthetic rates, high biomass production, faster growth in comparison to traditional feedstocks and to not be competitive with food production. In this paper, the growth and lipid content of three microalgae strains, namely Chorella vulgaris, Desmodesmus sp. and Desmodesmus brasiliensis, were studied during 9 days of mixotrophic cultivation. The laboratory scale experiments were carried out in BG-11 media enriched with 10 g/L glucose at initial medium pH of 7.5, temperature of 26 ± 4 °C and light flux of 62 μE m-2 s-1. The highest biomass concentration of 3.82 mg/mL was found in the Desmodesmus brasiliensis, followed with 3.64 mg/mL of Desmodesmus sp. and 3.32 mg/mL of Chorella vulgaris strain. However, the Desmodesmus brasiliensis had the lowest lipid content of 6%, followed with 13.2% of Chorella vulgaris, whereas the Desmodesmus sp. strain produced the highest lipids (19.45%). Copyright © 2016, AIDIC Servizi S.r.l.,.

关键词： Feedstocks

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Biosensors: Boron Doped ZIF-67@Graphene Derived Carbon Electrocatalyst for Highly Efficient Enzyme-Free Hydrogen Peroxide Biosensor (Adv. Mater. Technol. 12/2017)

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Advanced Materials Technologies 2017年第12期2卷

作者： Zehui Li Wenbo Wang Hongbin Cao Qiang Zhang Xinyuan Zhou Dongbin Wang Yaling Wang Shuangshuang Zhang Guangjin Zhang Chenming Liu Yi Zhang Rongji Liu Jingkun Jiang Beijing Engineering Research Center of Process Pollution Control Division of Environmental Technology and Engineering Institute of Process Engineering Chinese Academy of Sciences Beijing 100049 P. R. China State Key Joint Laboratory of Environment Simulation and Pollution Control School of Environment Tsinghua University Beijing 100084 P. R. China University of Chinese Academy of Sciences Beijing 100049 P. R. China Institute of Inorganic Chemistry I Ulm University Ulm 89081 Germany

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A Geometric Extension Design for Second-Order Nonlinear Agents Formation Surrounding a Sphere

A Geometric Extension Design for Second-Order Nonlinear Agen...

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第28届中国控制与决策会议

作者： Yang-Yang Chen Kai-Xuan Wang Ya Zhang Cheng-Lin Liu Qin Wang School of Automation Southeast University Key Laboratory of Measurement and Control of Complex Systems of Engineering Ministry of EducationSoutheast University Chien-Shiung Wu College Southeast University Key Laboratory of Advanced Process Control for Light Industry(Ministry of Education) Institute of AutomationJiangnan University College of information engineering Yangzhou University

ISBN: (纸本)9781467397155

This article deals with the problem of driving a family of second-order nonlinear agents to land on a sphere and formation tracking a set of given orbits on the sphere.A novel geometric extension called the concentric compression method is proposed to give a solution to spheral landing and then combines with the control of spherical meridian and parallel to achieve formation motion along given orbits on the *** asymptotic stability of system is proved by Lyapunov-based method when the communication topology is *** effectiveness of the analytical result is verified by a numerical simulation.

关键词： Formation tracking Sphere landing Geometric Extension Second-Order Nonlinear Agents

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Unit-level modelling for KPI of batch hot strip mill process using dynamic partial least squares

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IFAC-PapersOnLine 2015年第28期48卷 1005-1010页

作者： Zhang, Kai Shardt, Yuri A. W. Chen, Zhiwen Ding, Steven X. Peng, Kaixiang Institute for Automatic Control and Complex Systems University of Duisburg-Essen Bismarckstrasse 81 BB Duisburg47057 Germany Key Laboratory for Advanced Control of Iron and Steel Process School of Automation and Electrical Engineering University of Science and Technology of Beijing Beijing100083 China

This paper proposes two different approaches to the problem of modelling the key performance indicators (KPIs) in a hot strip mill process (HSMP). The first approach takes into consideration the inherent dynamics of the process and develops a nonlinear iterative dynamic partial least squares (PLS) model. The second approach takes into consideration the multibatch property of HSMP to develop an appropriate multibatch modelling framework. Both approaches can be integrated into the dynamic model framework. The proposed framework is examined using industrial data obtained from a steel plant, where it provides a decent model for this process. However, there exists the potential for improvements including dealing with interbatch variability. © 2015, IF AC (International Federation of Automatic control) Hosting by Elsevier Ltd. All rights reserved.

关键词： Strip mills Benchmarking Least squares approximations Steelmaking Strip metal Waste disposal Hot strip mills Industrial datum Key performance indicators Model framework Modelling framework Multibatch Partial least square (PLS) Partial least squares models

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The Marine Biodiversity Observation Network Plankton Workshops: Plankton Ecosystem Function, Biodiversity, and Forecasting—Research Requirements and Applications

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Limnology and Oceanography Bulletin 2022年第1期31卷 22页

作者： Maria Grigoratou Enrique Montes Anthony J. Richardson Jason D. Everett Esteban Acevedo-Trejos Clarissa Anderson Bingzhang Chen Tamar Guy-Haim Jana Hinners Christian Lindemann Tatiane Martins Garcia Klas O. Möller Fanny M. Monteiro Aimee R. Neeley Todd D. O'Brien Artur P. Palacz Alex J. Poulton A. E. Friederike Prowe Áurea E. Rodríguez-Santiago Cécile S. Rousseaux Jeffrey Runge Juan F. Saad Ioulia Santi Rowena Stern Alice Soccodato Selina Våge Meike Vogt Soultana Zervoudaki Frank E. Muller-Karger Gulf of Maine Research Institute Portland ME USA Ocean Chemistry & Ecosystems Division Atlantic Oceanographic and Meteorological Laboratory National Oceanic and Atmospheric Administration Miami FL USA School of Mathematics and Physics University of Queensland Brisbane QLD Australia CSIRO Oceans and Atmosphere Queensland Biosciences Precinct St. Lucia QLD Australia Centre for Marine Science and Innovation School of Biological Earth and Environmental Sciences University of New South Wales Sydney NSW Australia Earth Surface Process Modelling German Research Centre for Geosciences (GFZ) Potsdam Germany Scripps Institution of Oceanography La Jolla CA USA Department of Mathematics and Statistics University of Strathclyde Glasgow UK Hong Kong Branch of Southern Marine Science and Engineering Guangdong Laboratory (Guangzhou) The Hong Kong University of Science and Technology Clear Water Bay Hong Kong China National Institute of Oceanography Israel Oceanographic and Limnological Research Haifa Israel Helmholtz-Zentrum Hereon Geesthacht Germany Department of Biological Sciences University of Bergen Bergen Norway Instituto de Ciências do Mar (LABOMAR) Universidade Federal do Ceará (UFC) Fortaleza Brazil Department Biological Carbon Pump Helmholtz-Zentrum Hereon Institute of Carbon Cycles Geesthacht Germany Bristol Research Initiative for the Dynamic Global Environment (BRIDGE) School of Geographical Sciences University of Bristol Bristol UK NASA Goddard Space Flight Center/Science Systems and Applications Inc Greenbelt MD USA NOAA Fisheries Silver Spring MD USA International Ocean Carbon Coordination Project Institute of Oceanology Polish Academy of Sciences Sopot Poland Lyell Centre for Earth and Marine Science Heriot-Watt University Edinburgh UK GEOMAR Helmholtz Centre for Ocean Research Kiel Kiel Germany Caribbean Coastal Ocean Observing System (CARICOOS) University of Puerto Rico-Mayaguez Mayagüez PR USA Taller Ecológico de Puerto Rico Boquerón P

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Globally stabilizing state feedback control design for Lotka-Volterra systems based on underlying linear dynamics

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IFAC-PapersOnLine 2015年第11 11期48卷 1000-1005页

作者： Magyar, Attila Hangos, Katalin M. Department of Electrical Engineering and Information Systems University of Pannonia Egyetem street 10. Veszprém H-8200 Hungary Process Control Research Group Control and Automation Research Institute HAS Kende street 13-17 BudapestH-1111 Hungary

Using translated X-factorable phase space transformations and nonlinear variable transformations a dynamically similar linear ODE model is associated to the Lotka-Volterra system models with a positive equilibrium point. This enables to use a linear full state feedback controller to stabilize the system in controllable cases, that leaves the open loop equilibrium point unchanged. The linear state feedback controller design problem in the general case has also been formulated to ensure the compartmental property of the closed loop system from which the existence of a diagonal Lyapunov function follows. Further extension has been obtained by using the time re-parametrization transformation defined for quasi-polynomial models. © 2015

关键词： Mathematical transformations Biological systems Closed loop systems controllers Feedback control Linear transformations Lyapunov functions Phase space methods Polynomial approximation Predator prey systems State feedback Diagonal Lyapunov functions Linear state feedback Lotka Volterra models Lotka Volterra systems Nonlinear variables Phase space transformation Positive equilibrium Quasi poly nomial

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