An ontology-based approach to knowledge management in design processes (2008)
Brandt, S., Morbach, J., Miatidis, M., Theissen, M., Jarke, M., Marquardt, W.
Synergy by integrating new functionality (2008)
Becker, S., Heller, M., Jarke, M., Marquardt, W., Nagl, M., Spaniol, O., ...
Ontology-based information management in design processes (2006)
Brandt, S.C., Morbach, J., Miatidis, M., Theissen, M., Jarke, M., Marquardt, W.
Engineering design processes are highly creative and knowledge-intensive tasks that involve extensive information exchange and communication among diverse developers. In such dynamic settings,...
Optimal Grade Transition in Industrial Polymerization Processes via NCO Tracking (2005)
Kadam, J.V., Marquardt, W., Srinivasan, B., Bonvin, D.
In industrial polymerization processes, several grades of polymer are frequently produced in the same plant by changing the operating conditions. Transitions between the different grades are rather...
Kadam, J. V., Marquardt, W., Srinivasan, B., Bonvin, D.
J. V. Kadam, W. Marquardt Lehrstuhl für Prozesstechnik, RWTH Aachen University, Turmstr. 46, 52064 Aachen, Germany B. Srinivasan, D. Bonvin Laboratoire d’Automatique, École Polytechnique...
Integrierte Prozesse in der Verfahrenstechnik (2002)
Schmidt-Traub,H., Emig,G., Hoffmann,U., Marquardt,W., Seidel-Morgenstern,A.
Integrierte Prozesse in der Verfahrenstechnik (2002)
Schmidt-Traub, H., Emig, G., Hoffmann, U., Marquardt, W., Seidel-Morgenstern, A.
Applications of modelling: a case study from process design (2002)
Eggersmann, M., Hackenberg, J., Marquardt, W., Cameron, I. T.
Multiscale Concepts for Moving Horizon Optimization (2001)
T. Binder, L. Blank, W. Dahmen, W. Marquardt, M. Grotschel, S. O. Krumke, ...
In chemical engineering complex dynamic optimization problems formulated on moving horizons have to be solved on-line. In this work, we present a multiscale approach based on wavelets where a...
Iterative Algorithms for Multiscale State Estimation, Part 2: Numerical Investigation (2001)
T. Binder, L. Blank, W. Dahmen, W. Marquardt
Usually direct methods are employed for the solution of linear systems arising in the context of optimization. However, motivated by the potential of multiscale refinement schemes for large problems...
On The Regularization Of Dynamic Data Reconciliation Problems (2001)
T. Binder, L. Blank, W. Dahmen, W. Marquardt
Dynamic data reconciliation problems are discussed from the perspective of the mathematical theory of ill-posed inverse problems. Regularization is of crucial importance to obtain satisfactory...
Iterative Algorithms for Multiscale State Estimation, Part 1: Concept (2001)
T. Binder, L. Blank, W. Dahmen, W. Marquardt
The objective of the present investigation is to explore the potential of multiscale re nement schemes for the numerical solution of dynamic optimization problems arising in connection with chemical...
Iterative Multiscale Methods for Process Monitoring (2000)
Der Deutschen, Forschungsgemeinschaft Schwerpunktprogramm, T. Binder, L. Blank, W. Dahmen, W. Marquardt
Process monitoring via state estimation is accomplished by the solution of an appropriately posed optimization problem on a receding horizon. The need of a fast solution of the optimization problem...
Grosser Systeme Echtzeitoptimierung (2000)
Schwerpunktprogramm Der, Deutschen Forschungsgemeinschaft Binder, T. Binder, L. Blank, W. Dahmen, W. Marquardt
In the present work we explore an adaptive discretization scheme for dynamic optimization problems formulated on moving horizons. The proposed method is embedded into a solution methodology where the...
Iterative Algorithms for Multiscale Dynamic Data Reconciliation (2000)
Der Deutschen, Forschungsgemeinschaft Schwerpunktprogramm, T. Binder, L. Blank, W. Dahmen, W. Marquardt
The objective of the present investigation is to explore the potential of multiscale renement schemes for the numerical solution of large constrained dynamic optimization problems arising in...
Grid Refinement in Multiscale Dynamic Optimization (2000)
Schwerpunktprogramm Der, Deutschen Forschungsgemeinschaft Binder, T. Binder, L. Blank, W. Dahmen, W. Marquardt
In the present work we explore an adaptive discretization scheme for dynamic optimization problems applied to input and state estimation. The proposed method is embedded into a solution methodology...
Towards Multiscale Dynamic Data Reconciliation (2000)
Schwerpunktprogramm Der, Deutschen Forschungsgemeinschaft Binder, T. Binder, L. Blank, W. Dahmen, W. Marquardt
Although reconciliation of steady-state process data is routinely applied in industrial practice, the theoretical understanding of the problem and its adequate formulation in a dynamic setting is...
Regularization of Dynamic Data Reconciliation Problems (2000)
Schwerpunktprogramm Der, Deutschen Forschungsgemeinschaft Binder, T. Binder, L. Blank, W. Dahmen, W. Marquardt
Dynamic data reconciliation problems are discussed from the perspective of the mathematical theory of ill-posed inverse problems. Regularization is of crucial importance to obtain satisfactory...
An Adaptive Multiscale Method for Real-Time Moving Horizon Optimization (2000)
Rwth Aachen, T. Binder, L. Blank, W. Dahmen, W. Marquardt
In the present work we explore an adaptive discretization scheme for dynamic optimization problems formulated on moving horizons. The proposed method is embedded into a solution methodology where the...
Grid Refinement in Multiscale Dynamic Optimization (2000)
Rwth Aachen, T. Binder, L. Blank, W. Dahmen, W. Marquardt
In the present work we explore an adaptive discretization scheme for dynamic optimization problems applied to input and state estimation. The proposed method is embedded into a solution methodology...
Iterative Algorithms for Multiscale Dynamic Data Reconciliation (2000)
T. Binder, L. Blank, W. Dahmen, W. Marquardt
The objective of the present investigation is to explore the potential of multiscale renement schemes for the numerical solution of large constrained dynamic optimization problems arising in...
A FIELD STUDY OF THE INDUSTRIAL MODELING PROCESS B.A. Foss (1999)
B. A. Foss, B. Lohmann, W. Marquardt
: This paper analyzes the modeling process by means of a field study in the chemical industries. A diversified set of experienced modelers from two different countries have been interviewed using a...
Regularization Of Dynamic Data Reconciliation Problems By Projection (1999)
T. Binder, L. Blank, W. Dahmen, W. Marquardt
Dynamic data reconciliation problems are discussed from the perspective of the mathematical theory of ill--posed inverse problems. Regularization is of crucial importance to obtain satisfactory...
Switchability and Flexibility of Dynamic Processes (1999)
T. Binder, O. Abel, W. Marquardt, Lehrstuhl Fur Prozesstechnik, Rwth Aachen
This report is a survey on the current state of the art in switchability and #exibility analysis written for use within the technical working group #Flexibility, Operability and Dynamics #TWG3#" of...
A Wavelet-Galerkin Method applied to Separation Processes (1999)
R. V. Watzdorf, K. Urban, W. Dahmen, W. Marquardt
flash unit. Applying the usual assumptions 1 (i.e. negligible vapor holdup, equilibrium, perfect stirred liquid phase, no chemical reactions) and assuming a constant molar holdup in the vessel, the...
Reinitialization of DAEs after discontinuities (1995)
Majer,C., Marquardt,W., Gilles,E. D.
The mathematical modelling of chemical processes involves the solution of large sets of sparse, stiff differential-algebraic equations (DAEs) which reveal discontinuities in their defining functions....
Reinitialization of DAEs after discontinuities (1995)
Majer, C., Marquardt, W., Gilles, E. D.
The mathematical modelling of chemical processes involves the solution of large sets of sparse, stiff differential-algebraic equations (DAEs) which reveal discontinuities in their defining functions....
Computing multiple steady states in homogeneous azeotropic distillation processes (1994)
Kienle,A., Gilles,E. D., Marquardt,W.
Steady state multiplicity in a single section of a distillation column involving ternary, homogeneous azeotropic mixtures is investigated. Multiple eigenvalues of the equilibrium relation are...
Computing multiple steady states in homogeneous azeotropic distillation processes (1994)
Kienle, A., Gilles, E. D., Marquardt, W.
Steady state multiplicity in a single section of a distillation column involving ternary, homogeneous azeotropic mixtures is investigated. Multiple eigenvalues of the equilibrium relation are...
Modeling and representation of complex objects : a chemical engineering perspective (1993)
Marquardt,W., Gerstlauer,A., Gilles,E. D.
Adequate support for the development, maintenance and modification of mathematical process models is the key issue for an extended application of model-based techniques in the design and operation of...
Modeling and representation of complex objects : a chemical engineering perspective (1993)
Marquardt, W., Gerstlauer, A., Gilles, E. D.
Adequate support for the development, maintenance and modification of mathematical process models is the key issue for an extended application of model-based techniques in the design and operation of...
Computing consistent initial conditions for differential-algebraic equations (1992)
Kröner,A., Marquardt,W., Gilles,E. D.
To solve differential-algebraic equation systems (DAEs) successfully, initial conditions must be consistent, i.e. they must satisfy the corresponding extended system of the DAEs. For index-one DAEs,...
Computing consistent initial conditions for differential-algebraic equations (1992)
Kröner, A., Marquardt, W., Gilles, E. D.
To solve differential-algebraic equation systems (DAEs) successfully, initial conditions must be consistent, i.e. they must satisfy the corresponding extended system of the DAEs. For index-one DAEs,...
Ein Trainingssimulator zur Ausbildung von Betriebspersonal in der chemischen Industrie (1990)
Gilles,E. D., Holl,P., Marquardt,W., Mahler,R., Schneider,H., Brinkmann,K., ...
DIVA : an open architecture for dynamic simulation (1990)
Kröner,A., Holl,P., Marquardt,W., Gilles,E. D.
During three years of application of the dynamic flowsheet simulator DIVA, existing features have been extended and new capabilities have been added. This expansion leads to an improved open...
Ein Trainingssimulator zur Ausbildung von Betriebspersonal in der chemischen Industrie (1990)
Gilles, E. D., Holl, P., Marquardt, W., Mahler, R., Schneider, H., Brinkmann, K., ...
DIVA : an open architecture for dynamic simulation (1990)
Kröner, A., Holl, P., Marquardt, W., Gilles, E. D.
During three years of application of the dynamic flowsheet simulator DIVA, existing features have been extended and new capabilities have been added. This expansion leads to an improved open...
DIVA : an open architecture for dynamic simulation (1989)
Kröner,A., Holl,P., Marquardt,W., Gilles,E. D.
During three years of application of the dynamic flowsheet simulator DIVA, existing features have been extended and new capabilities have been added. This expansion leads to an improved open...
DIVA : an open architecture for dynamic simulation (1989)
Kröner, A., Holl, P., Marquardt, W., Gilles, E. D.
During three years of application of the dynamic flowsheet simulator DIVA, existing features have been extended and new capabilities have been added. This expansion leads to an improved open...
Dynamic process flowsheet simulation : an important tool in process control (1988)
Marquardt,W., Holl,P., Gilles,E. D.
The limited nonlinear simulation capabilities of existing control system design packages are not sufficient for process and control system simulations. The development of detailed dynamic flowsheet...
DIVA : a powerful tool for dynamic process simulation (1988)
Holl,P., Marquardt,W., Gilles,E. D.
A program for dynamic simulation of chemical plants is presented. The dynamic plant equations and the corresponding Jacobian matrix are generated automatically. The full exploitation of sparse matrix...
Dynamic process flowsheet simulation : an important tool in process control (1988)
Marquardt, W., Holl, P., Gilles, E. D.
The limited nonlinear simulation capabilities of existing control system design packages are not sufficient for process and control system simulations. The development of detailed dynamic flowsheet...
DIVA : a powerful tool for dynamic process simulation (1988)
Holl, P., Marquardt, W., Gilles, E. D.
A program for dynamic simulation of chemical plants is presented. The dynamic plant equations and the corresponding Jacobian matrix are generated automatically. The full exploitation of sparse matrix...
Dynamische Anlagensimulation in der chemischen Verfahrenstechnik (1986)
Besides fundamental questions on modelling of chemical production processes and on structuring and realization of a dynamic simulator, numerous application examples for dynamic simulations are...
Dynamische Anlagensimulation in der chemischen Verfahrenstechnik (1986)
Besides fundamental questions on modelling of chemical production processes and on structuring and realization of a dynamic simulator, numerous application examples for dynamic simulations are...
A Field Study Of The Industrial Modeling Process (1970)
B. A. Foss, B. Lohmann, W. Marquardt
: This paper analyzes the modeling process by means of a field study in the chemical industries. A diversified set of experienced modelers from two different countries have been interviewed using a...