Industrial fuel cell stacks only provide very limited measurement information. To overcome this deficit, a state estimator for a molten carbonate fuel cell is developed in this contribution. The starting point of the ...
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ISBN:
(纸本)3540279385
Industrial fuel cell stacks only provide very limited measurement information. To overcome this deficit, a state estimator for a molten carbonate fuel cell is developed in this contribution. The starting point of the work is a rigorous spatially distributed model of the system. Due to its complexity, this model is hardly suitable for the design of a state estimator. Therefore, a reduced model is derived by using a Galerkin method and the Karhunen Loeve decomposition technique. A low order system of ordinary differential equations and algebraic equations results. The reduced model is used to study the observability of the system for different sensor configurations. An extended Kalman filter with a continuous time simulator part and a discrete time corrector part is designed on the basis of the reduced model. The filter is tested in simulations.
Pressure swing adsorption (PSA) processes are used for the separation and purification of gas mixtures. PSA plants are composed of several fixed-bed adsorbers and are operated as cyclic multi-step processes, i.e. thei...
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ISBN:
(纸本)3540279385
Pressure swing adsorption (PSA) processes are used for the separation and purification of gas mixtures. PSA plants are composed of several fixed-bed adsorbers and are operated as cyclic multi-step processes, i.e. their plant structure is changed from one cycle step to the next. Each fixed-bed adsorber is modeled as a nonlinear distributed parameter system describing the nonisothermal adsorption process. For the control of the product, purity, a, process control scheme consisting of a nonlinear feedforward and a linear feedback control is presented. The feedforward control is set up by use of an inverse reduced-order model which is approximating the I/O behavior of the considered 2-bed PSA plant;and is derived on the basis of its rigorous distributed parameter model. The model inversion is discussed by two types of reduced-order models: a Hammerstein model which neglects the internal plant structure and a hybrid lumped parameter model which takes the cyclic multi-step process into account. The designed trajectory control scheme is verified using the rigorous simulation model of the PSA plant and validated by means of laboratory experiments.
作者：
Fliess, MJoin, CSira-Ramírez, HCNRS
UMR 7161 Equipe ALIEN INRIA Futurs & EquipeUMR 7161Ecole Polytech F-91128 Palaiseau France Univ Henri Poincare
CNRS UMR 7039 INRIA Futurs & CRANEquipe ALIEN F-54506 Vandoeuvre Les Nancy France CINVESTAV IPN
Secc Mecatron Dept Ingn Elect Mexico City 07300 DF Mexico
We are designing, perhaps for the first time, closed-loop fault-tolerant control for uncertain nonlinear systems. Our solution is based oil a new algebraic estimation technique of the derivatives of a time signal, whi...
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ISBN:
(纸本)3540279385
We are designing, perhaps for the first time, closed-loop fault-tolerant control for uncertain nonlinear systems. Our solution is based oil a new algebraic estimation technique of the derivatives of a time signal, which yields good estimates of the unknown parameters and of the residuals, i.e., of the fault indicators, is easily implementable in real time, is robust with respect to a large variety of noises, without;any necessity of knowing their statistical properties. Convincing numerical simulations are provided via a popular case-study in the diagnosis community, namely the three-tank system, which may be characterized as a flat hybrid system.
In this paper, we consider a servomechanism problem in which the command and control functions are distributed in space, and hence the system consists of different components linked by a communication channel of finit...
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ISBN:
(纸本)3540279385
In this paper, we consider a servomechanism problem in which the command and control functions are distributed in space, and hence the system consists of different components linked by a communication channel of finite capacity. The desired control goal is achieved by designing appropriate encoders, decoders and internal models of the exogenous signals. As an application, we describe a how the output of a system can be forced to track a reference signal generated by a remotely located nonlinear oscillator.
A definition of invariant observer and compatible output function is proposed and motivated. For systems admitting a Lie symmetry-group G of dimension less or equal to the state dimension and with a G-compatible outpu...
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ISBN:
(纸本)3540279385
A definition of invariant observer and compatible output function is proposed and motivated. For systems admitting a Lie symmetry-group G of dimension less or equal to the state dimension and with a G-compatible output, an explicit procedure based on the moving frame method is proposed to construct;such invariant observers. It relies on an invariant frame and a complete set of invariant estimation errors. Two examples of engineering interest are considered: an exothermic chemical reactor and an inertial navigation problem. For both examples we show how invariance and the proposed construction can be a useful guide to design non-linear convergent observers, although the part of the design procedure which achieves asymptotic stability is not systematic and must take into account the specific nonlinearities of the case under study.
This contribution is devoted to the infinite-dimensional control of a multi-layered piezoelectric cantilever with a tip mass. Thereby, the design of the layer structure, in particular of the piezoelectric actuator and...
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ISBN:
(纸本)3540279385
This contribution is devoted to the infinite-dimensional control of a multi-layered piezoelectric cantilever with a tip mass. Thereby, the design of the layer structure, in particular of the piezoelectric actuator and sensor layers, is considered as a part of the controller design. The control objective is to provide two independently controllable degrees-of-freedom for the tip mass in form of the tip position and the tip angle. The control concept being proposed consists of all open-loop flatness-based tracking controller and a linear dynamic feedback controller in order to asymptotically stabilize the closed-loop error system. A rigorous stability proof based on the C-0-semigroup theory and on LaSalle's invariance principle for infinite-dimensional systems will be given. Finally, simulation results demonstrate the potential of this smart actuator.
A nonlinear heat conduction problem from crystal growth technology is considered. The growth process studied comprises two phases (solid crystal and liquid melt) separated by a moving interface. Using "flatness b...
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ISBN:
(纸本)3540279385
A nonlinear heat conduction problem from crystal growth technology is considered. The growth process studied comprises two phases (solid crystal and liquid melt) separated by a moving interface. Using "flatness based" methods solutions are parameterized by flat output trajectories. Numerical aspects of series convergence are discussed and flatness based feedback design is sketched.
A flatness-based two-degree-of-freedom control is applied to industrial semi-batch reactors. The advanced process control scheme makes use of a calorimetric model of the reactor in order to calculate the nominal nonli...
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ISBN:
(纸本)3540279385
A flatness-based two-degree-of-freedom control is applied to industrial semi-batch reactors. The advanced process control scheme makes use of a calorimetric model of the reactor in order to calculate the nominal nonlinear feedforward;the feedback part consists of a simple PID control. Results from production axe presented, which show the performance and effectiveness of the applied control.
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