Abstmct-The paper provides dependability modeling and evaluation (encompassing reliability and safety issues) of the two major fault tolerance software approaches: recovery Mocks (RB) and N-version programming (NVP). The study is based on the detailed analysis of software fault-tolerance architectures able to tolerate a single fault (RB: two alternates and an acceptance test, NVP: three version...

Rapid developments are occurring in design of electrical machines and its control. To get optimum performance under normal/fault condition needs implementation of fault tolerance. Next decade is of Permanent Magnet Synchronous Machines. The paper presents mathematical modeling of PMSM. A current and speed controller is designed to implement fault tolerance and its stability analysis.

Successful failure analysis requires accurate fault diagnosis. This paper presents a method for diagnosing bridging faults that improves on previous methods. The new method uses single stuck-at fault signatures, produces accurate and precise diagnoses, and takes into account imperfect fault modeling; it accomplishes this by introducing the concepts of match restriction, match requirement, and m...

time-history analysis is defined as a kind of dynamic analysis increasingly used in design of structures and evaluation of existing ones. one of the important issues in the time-history analysis is selecting earthquake records. in this case, seismic design provisions states that time histories shall have similar source mechanisms, geological and seismological features with region under study. a...

Building efficient systems is one of the main challenges for software developers, who have been concerned with dependability-related issues as they built and deployed. Lots of changes often needs including the nature of faults and failures and the complexity of systems. Sometimes accepting minor errors always need efforts to eliminate faults that might cause them is in the core of dependability...

Dependable LQNS is a software tool for modeling and evaluating performability of fault-tolerant layered distributed applications that use a separate architecture for failure detection and reconfiguration. It takes into account the effects of management architecture, application software architecture, failure of management and application components in the dependability computation. It uses a co...

This paper studies the robust fault detection problem using the standard H∞ filtering formulation. With this formulation, the minimization of the disturbance effect on the residual is formulated as a standard H∞ filtering problem and the design is solved using standard H∞ techniques. To facilitate the enhancement of the residual sensitivity to the fault, the difference between the residual and ...

Complex control applications require capabilities for accommodating faults in the controlled plant. Fault accommodation involves the detection and isolation of faults, and then taking appropriate control actions to mitigate the fault effects and maintain control. This requires the integration of fault diagnostics with control in a feedback loop. This paper discusses a generic framework for buil...

COMSIM is a fault simulator for combinational circuits which can efficiently handle various gate level fault models. Stuck-at faults, function conversions, bridging faults, transition faults as well as multiple faults of all types and faults with additional fault detection conditions, can be simulated in one pass. This offers a practical approach to solve the conflict between the accuracy of fa...