Model-based fault detection relies on checking the discrepancy between the measurements obtained from a monitored process and its model. In general, the model representing the process behaviour has substantial uncerta...
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Model-based fault detection relies on checking the discrepancy between the measurements obtained from a monitored process and its model. In general, the model representing the process behaviour has substantial uncertainties. In this contribution, two fault detection methods that explicitly take the modelling uncertainties into account are presented and compared. The first approach uses the interval model while the second tackles the process to be monitored as a quantised system. The main ideas of both approaches are discussed and the results of the fault detection using each approach will be analysed and compared with respect to the DAMADICS actuator benchmark.
In this paper the idea of input reconstruction by means of system inversion is discussed. In view of the latest results of geometrical system theory the properties of the inverse is characterized. It is shown how the ...
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In this paper the idea of input reconstruction by means of system inversion is discussed. In view of the latest results of geometrical system theory the properties of the inverse is characterized. It is shown how the dynamic inversion approach can be used to construct residual generators to fault detection and isolation. Linear and nonlinear systems with vector relative degree are considered.
In this paper, a servo control synthesis based on the μ method is applied. With this method, a robust compensator that achieves performance specifications can be designed, which provides the track of the predefined r...
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In this paper, a servo control synthesis based on the μ method is applied. With this method, a robust compensator that achieves performance specifications can be designed, which provides the track of the predefined reference signal, rejects the effects of the disturbances and takes structured uncertainty into consideration. In the mixed μ synthesis, both the real parametric and the complex uncertainties are handled together, which usually yields a less conservative compensator than the traditional robust control design methods. The design strategy is illustrated for an inverted pendulum device, which involves real parametric uncertainties.
This paper is concerned with the use of active brake systems in order to decrease the rollover risk of heavy vehicles. Since the forward velocity of the vehicle changes in time, the combined yaw-roll dynamic model has...
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This paper is concerned with the use of active brake systems in order to decrease the rollover risk of heavy vehicles. Since the forward velocity of the vehicle changes in time, the combined yaw-roll dynamic model has a nonlinear structure. Selecting the forward velocity and the so-called normalized lateral load transfer at the rear side as scheduling parameters, a Linear Parameter Varying (LPV) model is constructed. In the control design based on the LPV model, the changes in the forward velocity, the performance requirements and the model uncertainties are taken into consideration. The control design is demonstrated in different situations.
State observation of distributed parameter systems pose the problem of coping with the infinite state dimension of the process models. In addition to this difficulty, the dynamics of Simulated Moving Bed (SMB) process...
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State observation of distributed parameter systems pose the problem of coping with the infinite state dimension of the process models. In addition to this difficulty, the dynamics of Simulated Moving Bed (SMB) processes is described by partial differential equations which are governed by switching initial conditions or switching boundary conditions, respectively. Furthermore, due to the setup of SMB plants only limited measurement information of the process behaviour is available. To overcome these difficulties, a model of the wave fronts of the SMB concentration profiles is derived which comprises a linear time-variant discrete-time state-space model describing the form, position and propagation of the wave fronts. A new approach to the solution of the state observation problem is proposed which is based on this model. Simulations of a closed-loop controlled SMB process are presented to show the applicability of the developed observer in the surrounding of the stationary operating point.
This paper describes the principles of an intelligent automaton for controlling the secondary stage of a wastewater treatment plant. The automaton has been implemented as a finite state machine that can be integrated ...
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This paper describes the principles of an intelligent automaton for controlling the secondary stage of a wastewater treatment plant. The automaton has been implemented as a finite state machine that can be integrated into the existing supervisory control and data acquisition system of any wastewater treatment plant. Human knowledge, in the form of linguistic rules, is embedded in the automaton, which has been shown to be capable of controlling the process very satisfactorily in all but extreme conditions.
When control loops incorporate fieldbus systems, typical quality of service parameters like delay and jitter play an important role with respect to the performance of the control. Traditionally, the desired quality of...
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In this paper a combined control structure with an active antiroll bar control and an active braking control is developed to decrease the rollover risk of heavy vehicles. This control structure also results in a fault...
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In this paper a combined control structure with an active antiroll bar control and an active braking control is developed to decrease the rollover risk of heavy vehicles. This control structure also results in a fault-tolerant system since in case of a failure an adequate tuning of the control mechanism guarantees the roll stability. The control design is based on LPV model of the vehicle in which the forward velocity and the lateral load transfer at the rear are selected as scheduling parameters. In the actual controlled system, the compensator also uses the output of a fault detection filter. The operation of the control mechanism is demonstrated in a double lane change maneuver
A control systems engineering approach, employing a two-level overall system architecture and different but compatible formalisms for system representation on the upper and lower levels, has been investigated in detai...
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