In this note, fault detection techniques based on finite dimensional results are extended and applied to a class of infinite dimensional dynamical systems. This special class of systems assumes linear plant dynamics having an abrupt additive perturbation as the fault. This fault is assumed to be linear in the (unknown) constant (and possibly functional) parameters. An observer-based model estim...

In this paper, we study the problem of synthesizing faulttolerant components from specifications, i.e., the problem of automatically constructing a fault-tolerant component implementation from a logical specification of the component, and the system’s required level of fault-tolerance. We study a specific level of fault-tolerance: masking tolerance. A system exhibits masking tolerance when both...

of the Dissertation This thesis deals with the fault diagnosis design problem both for dynamical continuous time systems whose output signal are affected by fixed point quantization, referred as sampled-data systems, and for two different applications whose dynamics are inherent high nonlinear: a remotely operated underwater vehicle and a scramjet-powered hypersonic vehicle. Robustness is a cru...

We study sensor minimization problems in the context of fault diagnosis. Fault diagnosis consists of synthesizing a diagnoser that observes a given plant and identifies faults in the plant as soon as possible after their occurrence. Existing literature on this problem has considered the case of static observers, where the set of observable events does not change during execution of the system. ...

This paper examines the problem of introducing advanced forms of fault-tolerance via reconfiguration into safety-critical avionic systems. This is required to enable increased availability after fault occurrence in distributed integrated avionic systems (compared to static federated systems). The approach taken is to identify a migration path from current architectures to those that incorporate...

The fault tree analysis is one of the most frequent used methods of supporting the safety systems analysis. Real time systems are one of the fields of applications. Information of hazard occurrence in these systems is important as well as information related to timing aspects. In this chapter the models of gates has been collected, the notation of events for XML file generation has been given a...

This paper deals with the analysis of nonlinear reachability and fault tolerant properties of multiactuator nonlinear systems. In this case, the process is a steam generator process containing a set of actuators. After occurrence of one or several actuator faults detected and isolated by Fault Detection and Isolation (FDI) approaches, a quantitative analysis of the faulty system properties help...

Conventional fault tree analysis in safety analysis of complex engineering systems calculates the occurrence probability of the top undesired event using probabilistic failure rates. However, it is often very difficult to obtain those failure rates well in advance due to insufficient data, environment changing or new components. Fuzzy numbers can be applied to estimate failure rates by handling...

The crossed cube, which is a variation of the hypercube, possesses some properties superior to the hypercube. In this paper, assuming that each node is incident with at least two fault-free links, we show that an n-dimensional crossed cube contains a fault-free Hamiltonian cycle, even if there are up to 2n 5 link faults. The result is optimal with respect to the number of link faults tolerated....

the archaeological investigations of three prehistoric tells (zagheh, qabrestan, and sagzabad) located at a distance of ~2 km from each other in the qazvin plain (nw iran) indicates that tepe zagheh was occupied in 6th and 5th millennia b.c. but due to unknown reasons life at this site ceased and started in tepe qabrestan at the beginning of 4th millennium b.c. this tell was occupied for a mill...