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检索条件"任意字段=Symposium on Dynamics and Control of Process Systems"

共 1798 条记录，以下是981-990 订阅

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Identification of the nonlinear, multivariable behavior of mechatronic combustion engines

Identification of the nonlinear, multivariable behavior of m...

引用

5th IFAC symposium on Mechatronic systems, MECHATRONICS 2010

作者： Isermann, R. Schreiber, A. Institute of Automatic Control Laboratory of Control Engineering and Process Automation TU Darmstadt Germany

ISBN: (纸本)9783902661760

The identification of the nonlinear dynamic behavior of combustion engines on test benches is described. A method, that is based on the combination of statistical stationary engine measurement (Design of Experiments - DoE) and dynamic identification techniques for nonlinear multi-input systems is shown. The dynamics are excited by several amplitude-modulated pseudorandom-binary- signals (APRBS), which act on the engine simultaneously, in order to allow a short measurement time period. To show the applicability of the described identification and modelling methods several models for a common-rail diesel engine with exhaust gas recirculation and variable geometry turbocharger (VGT) are shown, with five input variables and the outputs nitrogen-oxide emissions, opacity, air-fuel ratio (Lambda) and exhaust gas temperature. © 2010 IFAC.

关键词： Diesel engines

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PASSIVE BILATERAL TELE-OPERATION AND HUMAN POWER AMPLIFICATION WITH PNEUMATIC ACTUATORS

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2nd Annual Dynamic systems and control Conference (DSCC 2009)/Bath/ASME symposium on Fluid Power and Motion control

作者： Durbha, Venkat Li, Perry Y. Univ Minnesota Dept Mech Engn Ctr Compact & Efficient Fluid Power Minneapolis MN 55455 USA

ISBN: (纸本)9780791848920

In this paper a passive bilateral tele-operation between two pneumatic actuators is presented. The co-ordinated system is controlled to behave as a rigid mechanical tool that interacts with the human and other environment inputs. The input human forces when applied via a force sensor, can be amplified through the tele-operator to provide assistance for the human operator to perform the task either remotely or on-site. By ensuring that the system is energetically passive, robust stability is gauranteed during interaction with humans and various environments. Heat transfer during actuation affects the force output of a pneumatic actuator. The significance of this effect is studied by modeling the actuator dynamics for isothermal and adiabatic process. control schemes for these two extreme cases of heat transfer are developed separately. Experimental evaluation of the controllers is done on two single d.o.f pneumatic actuators. Results show good co-ordination between master and slave actuators, both in free motion and during hard contact. The root mean square position co-ordination error for isothermal model is I mm in free motion and 3.5mm during hard contact. The corresponding errors for adiabatic model are 0.8mm and 2.5mm respectively. Human force amplification, and force reflection during hard contact are also experimentally demonstrated for both isothermal and adiabatic model. From these results it is apparent that the difference between isothermal and adiabatic assumptions is not very significant.

关键词： Force sensors Reflection dynamics (Mechanics) Pneumatic actuators Modeling Heat transfer Adiabatic processes (Thermodynamics) control equipment Stability Errors Actuators

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Networked plantwide process control with asynchronous communication and control

Networked plantwide process control with asynchronous commun...

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9th International symposium on dynamics and control of process systems, DYCOPS 2010

作者： Xu, Shichao Bao, Jie School of Chemical Engineering University of New South Wales UNSW Sydney NSW 2052 Australia

ISBN: (纸本)9783902661692

The need for economic efficiency and safety has driven the development of large and complex chemical plants. Due to the presence of interactions, controlling such plants are often difficult. This paper aims to address this issue by developing a networked-based process control approach. In this framework, a plantwide process is modeled as network of process units which is controlled by a network of autonomous controllers. The controllers within the network operate with different sampling rates and communicate with each other asynchronously, to allow flexibility and better utilization of communication bandwidth. A key feature of controller network is the connective stability among controllers, which ensures plantwide stability when communication problems such as data packet drop-outs occur. Using the concept of dissipativity, plantwide connective stability and global performance is translated into conditions for which each controller has to satisfy. The controllers are then designed individually to form an autonomous and distributed control system. © 2009 IFAC.

关键词： controllers

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A comparison of nonlinear state estimators for closed-loop control of batch crystallizers

A comparison of nonlinear state estimators for closed-loop c...

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9th International symposium on dynamics and control of process systems, DYCOPS 2010

作者： Mesbah, Ali Huesman, Adrie E.M. Kramer, Herman J.M. Van Den Hof, Paul M.J. Delft Center for Systems and Control Delft University of Technology Mekelweg 2 2628 CD Delft Netherlands Process and Energy Laboratory Delft University of Technology Leeghwaterstraat 44 2628 CA Delft Netherlands

ISBN: (纸本)9783902661692

This study investigates the effectiveness of various nonlinear estimation techniques for output feedback model-based control of batch crystallization processes. Several nonlinear observers developed under deterministic and Bayesian estimation frameworks are applied for closed-loop control of a semi-industrial fed-batch crystallizer. The performance evaluation is done in terms of closed-loop behavior of the control strategy and its ability to cope with model imperfections and process uncertainties such as measurement errors and uncertain initial conditions. The simulation results suggest that the extended and the unscented Kalman filters perform best in terms of fulfilling the control objective. Adopting a time-varying process noise matrix, which is particularly suited for batch processes, further enhances the accuracy of state estimates at the expense of a slight increase in computational burden. The results also indicate that model imperfections and process uncertainties rather significantly deteriorate the closed-loop performance of the controller due to inaccurate state estimation. © 2009 IFAC.

关键词： State estimation

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Combining direct and indirect methods for optimal control - A case study

Combining direct and indirect methods for optimal control - ...

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9th International symposium on dynamics and control of process systems, DYCOPS 2010

作者： Hannemann, Ralf Marquardt, Wolfgang Aachener Verfahrenstechnik - Process Systems Engineering RWTH Aachen University Turmstr. 46 52064 Aachen Germany German Research School for Simulation Sciences GmbH 52425 Jülich Germany

ISBN: (纸本)9783902661692

Adaptive control vector parameterization for the solution of optimal control problems approximates the original infinite-dimensional optimal control problem by a set of finite-dimensional nonlinear programs (NLPs) whose control grids are iteratively refined. The refinement is stopped by a heuristic stopping criterion. The Hessians of the Lagrangian of these NLPs can be efficiently computed by the technique of composite adjoints as recently proposed by the authors. By means of a case study, namely the optimal control of the Williams-Otto semi-batch reactor, we show how to interpret composite adjoints as estimates for the continuous adjoints referred to by Pontryagin's Minimum Principle. Thus, these composite adjoints can be used to (i) construct a novel and mathematical sound stopping criterion for the iterative refinement of the control grid and to (ii) setup an indirect multiple shooting method the solution of which verifies and improves the approximate solution to the exact one. © 2009 IFAC.

关键词： Iterative methods

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Handling communication disruptions in distributed model predictive control

Handling communication disruptions in distributed model pred...

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9th International symposium on dynamics and control of process systems, DYCOPS 2010

作者： Heidarinejad, Mohsen Liu, Jinfeng De La Peña, David Muñoz Christofides, Panagiotis D. Department of Electrical Engineering University of California Los Angeles CA 90095-1592 United States Department of Chemical and Biomolecular Engineering University of California Los Angeles CA 90095-1592 United States Departamento de Ingeniería de Sistemas Automática Universidad de Sevilla Sevilla 41092 Spain

ISBN: (纸本)9783902661692

In this work, we deal with distributed model predictive control (DMPC) of nonlinear systems with communication disruptions between the distributed controllers. Specifically, we focus on the design of DMPC systems that take into account communication channel noise and data losses between the distributed controllers explicitly. In contrast to most of the existing DMPC methods which assume flawless communication, we employ a specific channel model to consider a number of realistic data transmission scenarios. In order to ensure the stability of the closed-loop system under communication disruptions, each model predictive controller utilizes a stability constraint which is based on a suitable Lyapunov-based controller. The theoretical results are demonstrated through a nonlinear chemical process example. © 2009 IFAC.

关键词： Nonlinear systems

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Dynamic behaviour of an HMR pre-combustion gas power cycle

Dynamic behaviour of an HMR pre-combustion gas power cycle

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9th International symposium on dynamics and control of process systems, DYCOPS 2010

作者： Zhao, Lei Michelsen, Finn A. Foss, Bjarne Aasen, Knut I. NTNU Department of Engineering Cybernetics NO-7491 Trondheim Norway SINTEF ICT Applied Cybernetics NO-7491 Trondheim Norway Statoil Forskningsparken NO-3908 Porsgrunn Norway

ISBN: (纸本)9783902661692

This paper explores dynamics for control design of a Hydrogen Membrane Reformer (HMR) pre-combustion gas power cycle. For this type of reforming to be competitive to power generation with carbon capture, low costs and emission of CO2 and NOx is required. Further, high operability and robustness is also required. This is achieved through an understanding of the system dynamics and robust control structure design. The paper presents a new dynamic model of the system which is validated against a static model and is the first analysis of dynamic behaviour of the HMR pre-combustion gas power cycle. The paper identifies important dynamic features of the reformer unit and focuses on the responses in outlet temperature and hydrogen concentration of the HMR unit to changes in important candidate inputs. An initial control study explores a simple control scheme for handling important disturbances like feed changes and load changes. © 2009 IFAC.

关键词： Robust control

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REDUCING TORSIONAL VIBRATION IN AN ENGINE COLD-TEST CELL FOR IMPROVED STRUCTURAL RELIABILITY AND ENGINE ASSEMBLY DEFECT DIAGNOSTICS

REDUCING TORSIONAL VIBRATION IN AN ENGINE COLD-TEST CELL FOR...

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2nd Annual Dynamic systems and control Conference (DSCC 2009)/Bath/ASME symposium on Fluid Power and Motion control

作者： Gul, Kamran A. Adams, Douglas E. Purdue Univ Sch Mech Engn W Lafayette IN 47906 USA

ISBN: (纸本)9780791848920

The driveline components of engine cold-test cells undergo large torsional vibrations during transient tests as the system resonances are excited by various engine harmonics. The excessive torsional vibrations not only compromise the structural reliability of the system but also make the fault detection process difficult by preventing accurate measurement of gear noise and by compromising the quality of diagnostic torque waveforms. This paper presents modeling of an engine cold-test cell and a methodology to quantify signal distortion levels by using the proposed distortion metrics which are based on harmonic order amplitude ratios. A rigorous validation of the simulation model using both torque amplitude and waveform distortion comparisons of experimental and simulation data is conducted. The model is used to identify the driveline inertia and stiffness parameters that can help reduce high torsional resonant amplitudes as well as waveform distortion. The design modifications are implemented in a production test cell which helped to control the torsional vibration and diagnostic signal degradation issues with a corresponding increase in the sensitivity to faults.

关键词： Inertia (Mechanics) Noise (Sound) Modeling Reliability Simulation Torque Gears Engines Vibration Resonance Design Flaw detection Stiffness Simulation models Transients (dynamics) Manufacturing Signals

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Lattice-size dependence and dynamics of surface mean slope in a thin film deposition process

Lattice-size dependence and dynamics of surface mean slope i...

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9th International symposium on dynamics and control of process systems, DYCOPS 2010

作者： Huang, Jianqiao Hu, Gangshi Orkoulas, Gerassimos Christofides, Panagiotis D. Department of Chemical and Biomolecular Engineering University of California Los Angeles CA 90095-1592 United States Department of Electrical Engineering University of California Los Angeles CA 90095-1592 United States

ISBN: (纸本)9783902661692

This work focuses on the study of the dynamic behavior and lattice size dependence of the surface root-mean-square slope in a porous thin film deposition process taking place on a triangular lattice. The simulation results indicate that the expected mean slope square reaches quickly a steady-state value and exhibits a very weak dependence with respect to lattice size variation. The simulation findings are corroborated by an analysis of appropriate finite-difference discretizations of surface height profiles computed by an Edwards-Wilkinson-type partial differential equation that can be used to describe the dynamics of surface height profile in the thin film deposition process under consideration. © 2009 IFAC.

关键词： Monte Carlo methods

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On gradient computation in single-shooting nonlinear model predictive control

On gradient computation in single-shooting nonlinear model p...

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9th International symposium on dynamics and control of process systems, DYCOPS 2010

作者： Ringset, Ruben Imsland, Lars Foss, Bjarne Cybernetica AS Leirfossveien 27 N-7038 Trondheim Norway Department of Engineering Cybernetics NTNU N-7038 Trondheim Norway

ISBN: (纸本)9783902661692

This paper gives an overview of methods for computing derivative information in dynamic optimization with path constraints. Efficiency of forward and adjoint techniques are discussed in a discrete-time setting and some algorithms are derived. Next, the discussion is extended to also include continuous-discrete systems. Dimensions in the model, signal parameterization, horizon length and sampling interval affect each of the methods differently. The key contributions of this paper is to give an overview of these methods, how they can be combined, and how different parameters affect efficiency. © 2009 IFAC.

关键词： Efficiency

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