New Voters for Redundant Systems

Broen, R. B.

doi:10.1115/1.3426869

Cited by 29 publications

(3 citation statements)

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“…Weight values can be determined statically or dynamically, which have various methods. Several examples about these techniques have been presented in [11] and [12]. The weighted average is calculated using = ∑ .…”

Section: Related Workmentioning

confidence: 99%

A confidence-based software voter for safety-critical systems

Rezaee

Sedaghat

Farmad

2014

2014 IEEE 12th International Conference on Dependable, Autonomic and Secure Computing

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To tolerate software faults, N-Version Programming (NVP) and N-Modular Redundant (NMR) techniques are widely employed. In these techniques, N modules operate on the same data and send their outputs to a software voter. Since the voter is a single point of failure in the techniques, availability and safety are essential requirements. In this paper a confidence-based software voting technique is proposed. The proposed technique considers weight oscillation and confidence of each module to improve availability and safety of the voter. Evaluation results showed that availability and safety of confidence-based software voter in contrast with standard majority voter and adaptive majority voter has improved about 4.4%, 4.9%, and 5.8% for three error injection scenarios.

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Section: Related Workmentioning

confidence: 99%

A confidence-based software voter for safety-critical systems

Rezaee

Sedaghat

Farmad

2014

2014 IEEE 12th International Conference on Dependable, Autonomic and Secure Computing

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“…The voter scheme is used to minimize switching transients since the isolation of faulty signals is achieved through a continuous numerical weighting (Broen, 1975). The voter scheme continuously determines the output in a manner which discriminates against the erroneous signal in favour of the other channels.…”

Section: Redundant Sensor Voting Schemementioning

confidence: 99%

Model-based fault detection and control design – Applied to a pneumatic industrial application

Grewal

Dixon

Goodall

et al. 2010

IFAC Proceedings Volumes

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Abstract:In safety critical applications it is important to detect faults that may compromise system safety and to take appropriate action. This paper discusses research carried-out on the development and validation of a model-based fault detection and isolation (FDI) system for a pneumatically actuated Stewart platform. The FDI scheme is based on combining parityequation and Kalman filter based techniques. The parity and Kalman filter equations are formulated and used to generate residuals that, in turn, are analysed to determine whether faults are present in the system. Details of the design process are given and the experimental results are compared. The results demonstrate that both approaches when combined can successfully detect and isolate and in some cases accommodate faults associated with the sensors, actuators (servo-valves and piping) and the pneumatic system itself.

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“…• Mean and weighted voter: The mean and weighted voter select, respectively, the mean or weighted average of the variants' output values, which are in an ordered space, as the adjudicated result (Broen 1975). Additional information related to the trustworthiness of the alternatives might be used to assign weights to the variant outputs, if using the weighted average voter (Pullum 2001).…”

Section: Design Issue I -Selection Of Variantsmentioning

confidence: 99%

Designing fault-tolerant SOA based on design diversity

Nascimento

Rubira

Burrows

et al. 2014

J Softw Eng Res Dev

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Background: Over recent years, software developers have been evaluating the benefits of both Service-Oriented Architecture (SOA) and software fault tolerance techniques based on design diversity. This is achieved by creating fault-tolerant composite services that leverage functionally-equivalent services. Three major design issues need to be considered while building software fault-tolerant architectures based on design diversity: (i) selection of variants; (ii) selection of an adjudication algorithm to choose one of the results; and (iii) execution of variants. In addition, applications based on SOA need to function effectively in a dynamic environment where it is necessary to postpone decisions until runtime. In this scenario, control is highly distributed and involves conflicting user requirements. We aim to support the software architect in the design of fault-tolerant compositions. Methods: Leveraging a taxonomy for fault-tolerant systems, this paper proposes guidelines to aid software architects in making key design decisions. The taxonomy is used as the basis for defining a set of guidelines to support the architect in making decisions related to fault tolerance in SOA. The same taxonomy is used in a systematic literature review of solutions for fault-tolerant composite services. The review investigates how existing approaches for fault-tolerant composite services address design diversity issues and also specific issues related to SOA. Results: The contribution of this work is twofold: (i) a set of guidelines for supporting the design of fault-tolerant SOA, based on a taxonomy for fault tolerance techniques; and (ii) a systematic literature review of existing solutions for designing fault-tolerant compositions using design diversity. Conclusion: Although existing solutions have made significant contributions to the development of fault-tolerant SOAs, there is a lack of approaches for fault-tolerant service composition that support strategies with diverse quality requirements and encompassing sophisticated context-aware capabilities. This paper discusses which design issues have been addressed by existing diversity-based approaches for fault-tolerant composite services. Finally, practical issues and difficulties are summarized and directions for future work are suggested.

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New Voters for Redundant Systems

Cited by 29 publications

References 0 publications

A confidence-based software voter for safety-critical systems

A confidence-based software voter for safety-critical systems

Model-based fault detection and control design – Applied to a pneumatic industrial application

Designing fault-tolerant SOA based on design diversity

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