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In this paper, integral sliding mode control ideas are incorporated with control allocation, to design fault tolerant controllers for longitudinal and lateral control of a large transport aircraft. The proposed scheme has the capability to retain nominal performance even in the face of total failure of certain actuators, provided there is enough redundancy in the system. During faults or failures,...
In this paper the design of sliding mode observers for gyro and thruster fault detection and isolation in the Mars Express satellite is presented. The results are part of a project with the goal of examining the potential applicability of the sliding mode observer technique to on-board satellite deployment. A Monte Carlo campaign has been performed to assess the performance and robustness of the sliding...
This paper presents a networked fault-tolerant control strategy based on control allocation which is applied to a modern aircraft. The proposed method utilizes the benefits of networked control system architecture in which smart sensors/actuators are interconnected through a bi-directional digital communication network. A smart actuator, the paper focuses on, is capable of providing the supervisor...
The cost of design, implementation, and maintenance of a fault-tolerant control system are significantly higher than that of a traditional control system. Therefore, the only time that one can even think and justify of using a fault-tolerant control system is for safety-critical applications. How does a fault-tolerant control system increase the level of safety? This is the main subject of this talk...
This paper deals with the problem of fault tolerant actuator network design. Multi criteria based algorithm is proposed to provide a fault tolerant architecture. These criteria are strong redundancy degree and a new criterion based on the number of admissible losses situations. The new criterion, computed for each actuator, guarantees some robustness for operating safety. An oriented graph is used...
This paper presents a procedure of fault detection and isolation of proton exchange membrane (PEM) fuel cell based on its mathematical model by nonlinear analytical redundancy approach. The model is simplified into five nonlinear state equations representation. The transient phenomena captured in the model include the compressor dynamics, the flow characteristics, mass and energy conservation and...
This paper deals with fault diagnosis issues for a Gas Turbine, GT, of a Combined Cycle Power Plant, CCPP. To analyze under which conditions faults in the turbogenerator can be detected and isolated, structural properties of the model are used. The structure redundancy is studied by graph tools considering the standard available measurements. A non-linear dynamic model given by 37 algebraic and differential...
Wavelet-based techniques for fault detection usually employ one of two basic approaches, namely (a) decomposition of a measured signal containing fault-related information or (b) decomposition of a residue calculated as the difference between sensor readings and the output of a model. An alternative approach, which was recently proposed in, consists of employing the wavelet transform to identify a...
A method for failure detection and isolation for redundant aircraft sensors is presented. The outputs of the concerned sensors are involved in the computation of flight law controls, and the objective is to eliminate any perturbation before propagation in the control loop when selecting a unique flight parameter among a set (generally 3) of redundant measurements. The particular case of an oscillatory...
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