Integral Sliding Mode Fault Tolerant Control Schemes with Control Allocation Mirza Tariq Hamayun The key attribute of a Fault Tolerant Control (FTC) system is to maintain overall system stability and acceptable performance in the face of faults and failures within the system. In this thesis new integral sliding mode (ISM) control allocation schemes for FTC are proposed, which have the potential...

Fault tolerant circuits are currently required in several major application sectors. Besides and in complement to other possible approaches such as proving or analytical modeling whose applicability and accuracy are significantly restricted in the case of complex fault tolerant systems, fault-injection has been recognized to be particularly attractive and valuable. Fault injection provides a me...

Process allocation is important for fault-tolerant multi-computer systems since it directly aaects the performance and dependability of the system. In this paper , we consider load-balancing process allocation for fault-tolerant systems that balances the load before as well as after faults start to degrade the performance of the system. We show two schemes to tolerate multiple faults in the pas...

This paper presents a novel technique for improved voting by adaptively varying the membership boundaries of a fuzzy voter to achieve realistic consensus among inputs of redundant modules of a fault tolerant system. We demonstrate that suggested dynamic membership partitioning minimizes the number of occurrences of incorrect outputs of a voter as compared to the fixed membership partitioning vo...

This paper is a survey of the work, done for making an IDS fault tolerant. IDS are prone to various attacks and it becomes the natural primary target of hostile attacks with the aim of disabling the detection feature and allowing an attacker to operate without being detected. This paper suggests that intrusion detection system (IDS) must be fault tolerant; otherwise, the intruder may first subv...

Tandem computer systems are designed to be single-fault tolerant. This paper takes a census of customer system outages reported to Tandem. The census shows a clear improvement in the reliability of hardware and maintenance. It indicates that now (1989) software is the majority source of reported system outages (62%), followed by system operations (15%). This is a dramatic shift from the statist...

We give a formal de nition of what it means for a system to \tolerate" a class of \faults". The de nition consists of two conditions: One, if a fault occurs when the system state is within a set of \legal" states, the resulting state is within some larger set and, if faults continue occurring, the system state remains within that larger set (Closure). And two, if faults stop occurring, the syst...

This thesis addresses issues in building fault-tolerant distributed real-time systems. Such systems are increasingly deployed in automotive and avionics applications. We focus on the design and validation of fault tolerance mechanisms. From the design viewpoint, we develop the notion of multi-layer fault tolerance. A fault-tolerant distributed system contains a set of mechanisms that provide er...

In this paper, a new actuator fault tolerant control strategy is proposed for nonlinear Takagi-Sugeno systems. The proposed control law uses the estimated fault and the error between the faulty system state and a reference system state. A proportional integral observer with unknown inputs is conceived in order to estimate simultaneously states and actuator faults. The problem of design of obser...

Software almost inevitably contains defects. Do everything possible to reduce the fault rate; Use faulttolerance techniques to deal with software faults. Fault tolerance is the ability of a system to perform its function correctly even in the presence of internal faults. Most of the ordinary systems lack fault tolerant software fix. This paper surveys various software Fault Tolerance techniques...