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Benoît Chachuat

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Publications associées (43)

Batch process optimization via run-to-run constraints adaptation

Dominique Bonvin, Alejandro Gabriel Marchetti, Benoît Chachuat

In the batch process industry, the available models carry a large amount of uncertainty and can seldom be used to directly optimize real processes. Several measurement-based optimization methods have been proposed to deal with model mismatch and process di ...

2007

Methodology for the Design of Man-Portable Power Generation Devices

Benoît Chachuat

An overview of a comprehensive methodology for the design of microfabricated fuel cell systems for portable power generation is presented. The methodology is based on a decomposition into three levels of modeling detail: (i) system-level models for process ...

2007

What is the design objective for portable power generation: Efficiency or energy density?

Benoît Chachuat

Recently, various alternatives to batteries, such as microfabricated fuel cell systems, have been proposed for portable power generation. In large-scale power production plants emphasis is placed on energy conversion efficiency. On the other hand, the intr ...

2007

Probabilistic observers for a class of uncertain biological processes

Benoît Chachuat, Olivier Bernard

In this paper, probabilistic observers are considered for a class of continuous biological processes described by mass-balance-based models. It is assumed that the probability density functions (PDFs) of the uncertain parameters and inputs of the model, as ...

2006

Can we assess the model complexity for a bioprocess: theory and example of the anaerobic digestion process

Benoît Chachuat, Olivier Bernard

In this paper we propose a methodology to determine the structure of the pseudo-stoichiometric coefficient matrix K in a mass balance based model, i.e. the maximal number of biomasses that must be taken into account to reproduce an available data set. It c ...

2006

Scale-up of batch processes via decentralized control

Michael Amrhein, Dominique Bonvin, Alejandro Gabriel Marchetti, Benoît Chachuat

The economic environment in the specialty chemicals industry requires short times to market and thus the ability to develop new products and processes very rapidly. This, in turn, calls for large scale-ups from laboratory to production. Due to scale-relate ...

2006

Global Solution of Dynamic Optimization and Mixed-Integer Dynamic Optimization

Benoît Chachuat

An overview of global methods for dynamic optimization and mixed-integer dynamic optimization (MIDO) is presented, with emphasis placed on the control parametrization approach. These methods consist of extending existing continuous and mixed-integer global ...

2006

Optimal start-up of micro power generation processes

Benoît Chachuat

uel cell based systems are a promising alternative to batteries in man-portable power generation applications. These micro power generation processes must operate fully autonomously and automatically without the intervention of operators. Operational consi ...

Elsevier2005

Long-term optimal aeration strategies for small-size alternating activated sludge treatment plants

Benoît Chachuat

This paper discusses the influence of time horizon on dynamic optimization of small-size wastewater treatment plants alternating aerobic and anoxic processes. The optimization problem consists in determining the aeration policy (air-on and air-off periods) ...

2005

Optimal aeration control of industrial alternating activated sludge plants

Benoît Chachuat

The operation of wastewater treatment plants is challenging for many small communities for economical and technical reasons. In this work, optimal control of the aeration system is considered to improve the efficiency and reliability of the activated sludg ...

2005

Assessing Model Complexity from Anaerobic Digestion Data: When is Model AM1 Required?

Benoît Chachuat, Olivier Bernard

The anaerobic digestion ecosystem is complex, involving a broad variety of substrates and up to 140 bacterial species. This paper applies a methodology that determines the least number of macroscopic bioreactions to be taken into account in order to explai ...

2005

Global Solution of Mixed-Integer Dynamic Optimization Problems

Benoît Chachuat

This paper presents a decomposition approach for a quite general class of mixed-integer dynamic optimization problems that is capable of guaranteeing a global solution despite the nonconvexities inherent to the dynamic optimization subproblems. A case stud ...

Elsevier2005

Optimal design and steady-state operation of micro power generation employing fuel cells

Benoît Chachuat

This paper presents a methodology for the optimal design and operation of man-portable power generation devices based on fuel cells. To illustrate the methodology, we focus on a simple process that consists of a fuel processing reactor, a solid-oxide fuel ...

Elsevier2005

Global mixed-integer dynamic optimization

Benoît Chachuat

Recent advances in process synthesis, design, operations, and control have created an increasing demand for efficient numerical algorithms for optimizing a dynamic system coupled with discrete decisions; these problems are termed mixed-integer dynamic opti ...

2005

Optimal operation of alternating activated sludge processes

Benoît Chachuat

The paper presents a dynamic optimisation study of a small size single basin wastewater treatment plant. The objective is to determine optimal sequences of aeration/non-aeration times so that for a typical diurnal pattern of disturbances, the effluent cons ...

2005

An integrated system to remote monitor and control anaerobic wastewater treatment plants through the internet

Gabriel Ruiz, Benoît Chachuat, Olivier Bernard, Pierre Lemaire, Andrea Franco

The TELEMAC project brings new methodologies from the Information and Science Technologies field to the world of water treatment. TELEMAC offers an advanced remote management system which adapts to most of the anaerobic wastewater treatment plants that do ...

2005

Design and Practical Use of Probabilistic Observers for Mass-Balance-Based Bioprocess Models

Benoît Chachuat, Olivier Bernard

In this paper, the design of probabilistic observers for mass-balance based bio- process models is investigated. It is assumed that the probability density function of every uncertain parameter, input and/or initial state is known a priori. Then, the proba ...

2004

A Two-Step Procedure for Estimating the Parameters in Mass-Balance-Based Bioprocess Models

Benoît Chachuat, Olivier Bernard

In this paper, we consider a two-step procedure for estimating the parameters in mass-balance based bioprocess models. In the first step, the values or combinations of the yield coefficients are calculated from mass-balance considerations without formulati ...

2004

Design of Probabilistic Observers for Mass-Balance-Based Bioprocess Models

Benoît Chachuat, Olivier Bernard

In this paper, the design of probabilistic observers for mass-balance based bioprocess models is investigated. It is assumed that the probability density of every uncertain parameter, input and/or initial state is known a priori. Then, the probability dens ...

2004

Feedback Issues in Dynamic Optimisation of a Small-Size Wastewater Treatment Plant

Benoît Chachuat

This simulation study presents dynamic optimisation of a small size single basin wastewater treatment plant. The ob jectives are to determine an optimal sequence of aeration/non-aeration times and the corresponding periodical steady state sub ject to minim ...

2004

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