This paper discusses fault detection and isolation for continuous-time systems using B-Splines and the notion of differential flatness. The idea is, from the system's flat outputs (which are obtained directly from...
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This paper discusses fault detection and isolation for continuous-time systems using B-Splines and the notion of differential flatness. The idea is, from the system's flat outputs (which are obtained directly from measurement or from an observer), we algebraically produce every other measured signal, including the inputs. The corresponding signals are then compared. In nominal condition, a measured signal and its counterpart derived from the flat outputs are similar up to noise and the filter's bandwidth. In the occurrence of faults, they are different. We then use this information to signify a fault and to compensate for it. The techniques used to produce signals from the flat outputs, and filter out the noise, are based on a B-Splines parametrisation.
This paper examines the potential improvement in an aluminium production process using Extremum Seeking control, to maintain operational conditions for temperature in a desired range. The proposed strategy applied to ...
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ISBN:
(纸本)9781846000386
This paper examines the potential improvement in an aluminium production process using Extremum Seeking control, to maintain operational conditions for temperature in a desired range. The proposed strategy applied to the aluminium process is simple, requiring little knowledge of the dynamics associated with the temperature of the process. Simulation results show that the proposed strategy for this process works well, obtaining good control of temperature, with small actuator movements.
In the present paper we obtain a closed-form solution for the class of continuous-time algebraic Riccati equations(ARE) with vanishing state weight, whenever the unstable eigenvalues are *** AREs in such a class solve...
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In the present paper we obtain a closed-form solution for the class of continuous-time algebraic Riccati equations(ARE) with vanishing state weight, whenever the unstable eigenvalues are *** AREs in such a class solve a minimum energy control *** obtained closed-form solution gives insight on issues such as loss of controllability and it might also prove comparable in terms of numerical precision over current solving ***: Algebraic Riccati equation;Closed-form solution;controllability;Minimum energy control;Signal-to-noise ratio.
Given the current financial crisis,there is renewed interest in modelling how the price of commodities change in the ***,such models have assumed constant ***,large and sudden changes in the parameters can also be ant...
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Given the current financial crisis,there is renewed interest in modelling how the price of commodities change in the ***,such models have assumed constant ***,large and sudden changes in the parameters can also be anticipated due to market *** paper is aimed at addressing this *** first describe a bias-variance trade-off in parameter estimation when sudden changes are *** then propose a mechanism to achieve a compromise between the observed bias and variance.A key ingredient of this mechanism is to use an estimator having a variable memory length.
This paper presents a novel control strategy for velocity tracking of Permanent Magnet Synchronous Machines (PMSM). The model of the machine is considered within the port-Hamiltonian framework and a control is designe...
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ISBN:
(纸本)9781457721182
This paper presents a novel control strategy for velocity tracking of Permanent Magnet Synchronous Machines (PMSM). The model of the machine is considered within the port-Hamiltonian framework and a control is designed using concepts of immersion and invariance (I&I) recently developed in the literature. The proposed controller ensures internal stability and output regulation, and it forces integral action on non-passive outputs.
Vehicle strings can be modelled as continuous-discrete 2D systems. However, every such 2D system includes a structural nonessential singularity on the stability boundary and special care is needed to analyse BIBO stab...
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ISBN:
(纸本)9781479901890
Vehicle strings can be modelled as continuous-discrete 2D systems. However, every such 2D system includes a structural nonessential singularity on the stability boundary and special care is needed to analyse BIBO stability of the system. A unidirectional vehicle string with communication range 2 is analysed and simulated.
It is shown how some classes of symmetric bidirectional heterogeneous vehicle strings can be modelled using a Hamiltonian framework. Hamiltonian systems theory is applied to show stability and string stability of cert...
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It is shown how some classes of symmetric bidirectional heterogeneous vehicle strings can be modelled using a Hamiltonian framework. Hamiltonian systems theory is applied to show stability and string stability of certain vehicle strings. We also indicate how this analysis might be extended to classes of nonlinear controllers.
Advanced design aims to achieve the best possible performance subject to operational constraints. Such questions can be formulated as optimization problems. The advantages of using an explicit optimization formulation...
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In this paper an actuator fault-tolerant control (FTC) strategy based on invariant set computation is presented. The proposed scheme is based on a bank of observers which match different fault situations that can occu...
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In this paper an actuator fault-tolerant control (FTC) strategy based on invariant set computation is presented. The proposed scheme is based on a bank of observers which match different fault situations that can occur in the plant. Each of these observers produces an estimation error with a distinctive behavior when the observer matches the current fault situation in the plant. With the information of the estimation errors from each of the considered observers, a fault diagnosis and isolation (FDI) module is able to reconfigure the control loop by selecting the appropriate stabilising controller from a bank of precomputed control laws, each of them related to one of the considered fault models. The decision criteria of the FDI is based on the computation of invariant sets of the estimation errors for each fault scenario and for each control configuration. Conditions for the design of the FDI module and for fault-tolerant closed-loop stability are given, and the effectiveness of the approach is illustrated with an example.
Many interesting design problems encountered in signal processing and control turn out to depend on a set of decision variables that can only take a finite number of values, i.e., they are quantized. For example, in p...
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