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Delay-dependent robust stabilization for uncertain singular systems with discrete and distributed delays

控制理论与应用（英文版） 2008年第2期6卷 171-176页

作者： Zhengguang WU Wuneng ZHOU National Lab of Industrial Control Technology Institute of Advanced Process Control Zhejiang University Hangzhou Zhejiang 310027 China College of Information Science and Technology Donghua University Shanghai 200051 China

This paper investigates the problem of delay-dependent robust stabilization for uncertain singular systems with discrete and distributed delays in terms of linear matrix inequality （LMI） approach. Based on a delay-dependent stability condition for the nominal system, a state feedback controller is designed, which guarantees the resultant closed- loop system to be robustly stable. An explicit expression for the desired controller is also given by solving a set of matrix inequalities. Some numerical examples are provided to illustrate the less conservativeness of the proposed methods.

关键词： Singular systems Time-delay systems Delay-dependent Robust stabilization Linear matrix inequality（LMI）

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Isolation and characterisation of collagens from the skin, scale and bone of deep-sea redfish (Sebastes mentella)

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FOOD CHEMISTRY 2008年第2期108卷 616-623页

作者： Wang, Lin An, Xinxin Yang, Fangmei Xin, Zhihong Zhao, Liyan Hu, Qiuhui Nanjing Agr Univ Coll Food Sci & Technol Key Lab Food Process & Qual Control Nanjing 210095 Peoples R China

To make more effective use of underutilised resources, collagens from skin, scale and bone (SKC, SCC and BOC) of deep-sea redfish were isolated with acetic acid and characterised for their potential in commercial applications. The abundant ash and fat in the materials could be removed effectively by EDTA and hexane treatment in 24 h, with high recoveries of protein. The yield of SKC (47.5%) was significantly higher than that of SCC and BOC (6.8% and 10.3%, respectively). The denaturation temperatures of SKC, SCC and BOC were 16.1 degrees C, 17.7 degrees C and 17.5 degrees C, respectively, which were lower than those of most other fish species. The amino acid profiles of these collagens were similar with a low imino acid content, which might be the reason for the low denaturation temperature. All the collagens were type I mainly and maintained their triple helical structures well with slight molecular structure differences. SKC possessed a higher degree of intermolecular cross-linking and molecular order, but the extent of peptide chain unwinding was also higher, due to the existence of fewer hydrogen bonds, compared to SCC and BOC. (c) 2007 Elsevier Ltd. All rights reserved.

关键词： deep-sea redfish (Sebastes mentella) collagen isolation characterisation

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Towards interprocess communication and interface synthesis for a heterogenous real-time rapid prototyping environment

Towards interprocess communication and interface synthesis f...

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6th International Workshop on Hardware/Software Codesign (CODES/CASHE 98)

作者： Fischer, F Muth, A Farber, G Tech Univ Munich Lab Process Control & Real Time Syst D-8000 Munchen Germany

ISBN: (纸本)0818684429

Rapid Prototyping has been proposed as a means to reduce development time and costs of real-rime systems. Our approach uses a heterogeneous, tightly coupled multiprocessor system based on off-the-shelf components as target architecture for an executable prototype, which is generated from the specification in an automated design process. Here, too, we aim to use existing tools and languages. But interface and communication synthesis, while being the key requirement of an automated translation of a abstract specification to a distributed system, is not yet state-of-the-art. The sensitivity of the overall performance of multiprocessor systems to overhead and latency introduced by communication on the other hand calls for an efficient interprocess communication (IPC). This paper presents concept and implementation of IPC functions which, implementing the message queue semantics of the specification language SDL, links the standard components of our multiprocessor system in an efficient manner, while at the same time providing the interface synthesis needed by the automated generation of a rapid prototype. The experiences gained when implementing a non-trivial, real-world CAN controller and monitor application on our rapid prototyping environment, are described as a first proof of concept.

关键词： communication synthesis rapid prototyping SDL hard real-time task classification model

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Neuron PID variable structure control

Neuron PID variable structure control

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IEEE Asia-Pacific Conference on Circuits and Systems (APCCAS-2000)

作者： Wang, N Ji, P Zhejiang Univ Res Inst Adv Process Control Natl Key Lab Ind Control Technol Hangzhou 310027 Peoples R China

ISBN: (纸本)0780362535

By combining a neuron controller and a PID controller, the neuron PID variable structure control method is proposed for multi-model plants in this paper. Using the proposed method for the basis weight control of a paper machine, the simulation results are made. It illustrates that the new control method have good performance, very strong robustness and adaptability.

关键词： control systems

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Optimization-based Reference Tracking for Two-Dimensional Multiple Source Heating 63

Optimization-based Reference Tracking for Two-Dimensional Mu...

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63rd IEEE Conference on Decision and control, CDC 2024

作者： Scholz, Stephan Berger, Lothar University of Applied Sciences Ravensburg-Weingarten Control and Process Engineering Lab Weingarten Germany

ISBN: (纸本)9798350316339

In this contribution, we create a model of two-dimensional linear heat conduction with nonlinear boundary conditions as heat transfer and heat radiation. The temperature is steered via multiple actuators on one boundary side, and measurements are taken with multiple sensors on the opposite boundary side. We design with a parametrized input function an optimization-based control strategy to follow a reference trajectory from low to high temperatures. When reaching the desired temperature value, measurements are stabilized at this operating point with a model predictive control technique. Finally, we demonstrate our proposed procedure with a numerical simulation. © 2024 IEEE.

关键词： Predictive control systems

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Modelling and advanced process control (APC) for distillation columns of linear alkylbenzene plant 7th

Modelling and advanced process control (APC) for distillatio...

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7th International Symposium on Advanced control of Chemical processes, ADCHEM 2003

作者： Jin, Xiaoming Rong, Gang Wang, Shuqing National Key Lab of Industrial Control Technology Institute of Advanced Process Control Zhejiang University Hangzhou310027 China

This paper introduces industrial application of model predictive control (MPC) for the series of columns in a linear alkylbenzene (lab) complex. The APC system that is consisted of twelve controlled variables, twelve manipulated variables and eight disturbance variables is used to deal with the constrained multivariable control problem of the distillation columns. Firstly, process modelling that includes experimental test and process identification is presented. Then, the construction and implementation of the APC system for the distillation columns are discussed. Industrial application results show that the APC system can maintain the best operation for a long time and realize ultimate operating potential of the distillation columns. Copyright © IFAC 2003

关键词： Model predictive control

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control of a distillation column: A decentralized approach

Control of a distillation column: A decentralized approach

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IEEE International Conference on control Applications

作者： Makaremi, Iman labibi, Batool KN Toosi Univ Technol Fac Elect Engn Control Dept Adv Automat & Digital Control lab Tehran Iran KN Toosi Univ Technol Fac Elect Engn Control Dept Process Control Lab Tehran Iran

ISBN: (纸本)9780780397958

This paper presents a decentralized controller for a binary distillation column. The interactions between subsystems are considered as uncertainty. Then appropriate local H-infinity problems are defined such that by solving them and applying the designed controller to the system, closed-loop stability and diagonal dominance are guaranteed.

关键词： Distillation columns

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A communication paradigm for wireless sensor/actuator networks

A communication paradigm for wireless sensor/actuator networ...

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2007 International Conference on Sensor Technologies and Applications, SENSORCOMM 2007

作者： Chen, Jiming Zhang, Yanping Cao, Xianghui Sun, Youxian State Key Lab. of Industrial Control Technology Institute of Industrial Process Control Zhejiang University Hangzhou 310027 China

ISBN: (纸本)0769529887

As a matter of fact, it causes a big challenge for protocol design to consider the coexistence of sensors and actuators in Wireless Sensor/Actuator Networks (WSANs), especially in automated architecture. This paper proposes a routing protocol, Vertex Matrix Routing (VMR), and designs an extensive simulation to explore the performance of VMR in automated architecture (AA) and semi-automated architecture (SAA). Some preliminary results are presented to demonstrate the difficulties in data collection with distributed multi-actuators and the advantages of using AA. © 2007 IEEE.

关键词： Network architecture

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Modeling and robust guaranteed cost control of shape and gauge composite regulation system for cold strip mill

Modeling and robust guaranteed cost control of shape and gau...

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1999 European control Conference, ECC 1999

作者： Xue, A. Lu, Y. Sun, Y. Institute of Industrial Process Control National Key Lab of Industrial Control Tech. Zhejiang University Hangzhou310027 China

ISBN: (纸本)9783952417355

The problem of composite regulation for shape and gauge of Φ300 mm 4-high reversible cold strip mill with the aid of backup roll and work roll bending is discussed in this paper. A composite regulation model with parameter uncertainties is developed. Then the paper deals with the problem of guaranteed cost control synthesis for uncertain systems. Necessary and sufficient conditions as well as controller design approach for robust guaranteed cost control are given. Based on the developed composite regulation model for the shape and gauge of the cold strip mill, a robust guaranteed cost control system is designed. Finally, simulation results of the designed system are given. © 1999 EUCA.

关键词： Robust control

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Preparation of novel anion exchangers from pine sawdust and bark, spruce bark, birch bark and peat for the removal of nitrate

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CHEMICAL ENGINEERING SCIENCE 2013年 98卷 59-68页

作者： Keranen, Anni Leiviska, Tiina Gao, Bao-Yu Hormi, Osmo Tanskanen, Juha Univ Oulu Dept Process & Environm Engn Chem Process Engn Lab FIN-90014 Oulu Finland Shandong Univ Shandong Prov Key Lab Water Pollut Control & Reso Sch Environm Sci & Engn Jinan 250100 Peoples R China Univ Oulu Dept Chem FIN-90014 Oulu Finland

Novel anion exchangers were prepared from pine (Pinus sylvestris) sawdust and bark, spruce (Picea abies) bark, birch (Betula pubescens/Betula verrucosa) bark and peat for the removal of nitrate (NO3-). Chemical modification was applied by means of epichlorohydrin, ethylenediamine and triethylamine in the presence of N,N-dimethylformamide (DMF). The materials were characterized in terms of elemental composition (C, H, N and O), chemical composition, BET surface area, FT-IR spectra and FESEM. Nitrogen (NO3--N) removal efficiency (%) was used as a performance indicator for the anion exchangers. Modified pine sawdust exhibited the best nitrate removal efficiency. Over 80% of NO3--N was removed at doses of > 3 g/l with a NO3--N concentration of 30 mg/l. The removal efficiency of modified pine sawdust remained unchanged at pH 3-10. Maximum sorption capacities of 24.2-30.1 mg/g were achieved for NO3--N, which were very good compared to the literature values and to a commercial anion exchange resin. The sorption was very rapid and the linearized pseudo-second order kinetic model fitted the data well. The sorption data were best fitted in the linearized Langmuir model. Modified pine sawdust was tested in column as well, where it maintained its ion exchange ability well for five ion exchange cycles including successful desorption cycles. (c) 2013 Elsevier Ltd. All rights reserved.

关键词： Lignocellulose Ion exchange Adsorption Nitrate removal Desorption Kinetics

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