Reliability studies and system health predictions are mostly based on the use of probability laws to model the failure of components. Behavior of the components of the system under study is represented by probability distributions, derived from failure statistics. The parameters of these laws are assumed to be precise and well known, which is not always true in practice. Impact of such imprecis...

Failure propagation analysis is the cornerstone to assure safe operation, predicative maintenance for equipment integrated system. Study the failure propagation mechanism of complex system on the basis system directed network constructed. The grade diffusing process widely used is described with the fault propagation probability and constrains. According to the fault information of nodes and ed...

Remote Procedure Call (RPC) is the most popular model to facilitate the building of distributed programs. However, it only provides a restricted availability of update operations and does not support fault-tolerant. The combination of RPC and data replication techniques has been developed to support fault-tolerant from Remote Procedure Call (RPC). However, different data replication techniques ...

This paper introduces a new method for safety analysis called HiPHOPS (Hierarchically Performed Hazard Origin and Propagation Studies). HiP-HOPS originates from a number of classical techniques such as Functional Failure Analysis, Failure Mode and Effects Analysis and Fault Tree Analysis. However, it extends, automates and integrates these techniques in order to address some of the problems cur...

Due to their nature, distributed systems are vulnerable to failures of some of their parts. Conversely, distribution also provides a way to increase the fault tolerance of the overall system. However, achieving fault tolerance is not a simple problem and requires complex techniques. An agreement problem known as the problem of consensus is at the heart of most problems encountered during the de...

Although traditional fault diagnosis methods can qualitatively identify the failure modes for power equipment, it is difficult to evaluate the failure probability quantitatively. In this paper, a failure probability calculation method for power equipment based on multi-characteristic parameters is proposed. After collecting the historical data of different fault characteristic parameters, the d...

An analysis of the failure statistics of a commercially available fault-tolerant system shows that administration and software are the major contributors to failure. Various approaches to software fault-tolerance are then discussed -notably process-pairs, transactions and reliable storage. It is pointed out that faults in production software are often soft (transient) and that a transaction mec...

In this paper, an active fault tolerant control scheme based on Dynamic Control Allocation method for Octorotor UAVs is developed. A Sliding Mode Observer is used to detect online any fault or failure affecting the UAV during flight. Whenever a fault or a total failure of a rotor is detected, the gain vector of the dynamic control allocator is updated resulting in the redistribution of the cont...

We treat a fault as an array of asperities with a prescribed statistical distribution of strengths. When an asperity fails, the stress on the failed asperity is transferred to one or more adjacent asperities. For a linear array the stress is transferred to a single adjacent asperity and for a two-dimensional array to three adjacent asperities. Using a renormalization group (RG) method, we inves...