Fault tolerance is an important design criterion for robotic systems operating in hazardous or remote environments. This article addresses the issue of tolerating a free-swinging joint failure by focusing on how to best configure a slow-moving manipulator before a failure. Three scalar measures of fault susceptibility are defined using joint torques/forces, accelerations, and swing angles. Mini...

It is recognized that the usual output of a fault tree analysis in some studies is not sufficiently informative. For added value in a widely used instrument for doing risk analyses, a Markovian approach is suggested. It is shown how to extend the calculations of the standard fault tree gates, so that information is available not only on the failure probability at the top level, but also on esti...

[1] We report on laboratory experiments in which stick-slipping shear surfaces are subject to transient stressing to simulate earthquake triggering by seismic waves. Granular layers and bare granite surfaces were sheared in a servo-controlled deformation apparatus in double-direct shear. The seismic waves from an earthquake and tectonic load were simulated by superimposing a loading rate sinuso...

Grid Computing provides non-trivial services to users and aggregates the power of widely distributed resources. Computational grids solve large scale scientific problems using distributed heterogeneous resources. The Grid Scheduler must select proper resources for executing the tasks with less response time and without missing the deadline. There are various reasons such as network failure, ove...

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...

To come over these issues there are many techniques like software/ code refactoring, software clustering, replication and software fault tolerance but this research says that applying software/ code refactoring techniques and software fault tolerance to reduce the chances of availability issue, failure cause, application fault and error, and performance and scalability issue in web application,...

There is a serious potential risk in the petrochemical production process, the Disaster Detection System(DDS) is of key equipment to monitor the production status, prevent and control the potential risk. However, the Initiating failure and Inhibiting failure would occur in the period of the Disaster Detection System(DDS) working. In order to identify the two failures by DDS itself, the paper pr...

Reliability analysis of fault tolerant systems often ignores the small probability that a failure might not be detected or, if detected, may not be properly handled. The probability that the failure is detected and properly handled is called coverage. Inclusion of coverage in reliability analysis is especially important when analyzing critical systems, systems which for some reason are not easi...

Wire rope is a very useful and long lasting structural element when properly used and maintained. For a failure such as that of crane wire rope, it is often very difficult to estimate precise failure rates or failure probabilities of individual components or failure events. Conventional fault tree analysis (FTA) is based on the probability assumption. When the failure probability of a system is...