Air data probes provide essential sensing capabilities to aircraft. The loss or corruption of air data measurements due to sensor faults jeopardizes an aircraft and its passengers. To address such faults, sensor hardware redundancy is typically combined with a voting system to detect and discard erroneous measurements. This approach relies on redundancy, which may lead to unacceptable increases...

Modular redundancy, the traditional approach to fault tolerance, is prohibitively expensive because of the overhead in replicating the hardware. In this paper we discuss alternative techniques for fault tolerance in sequence enumerators that are implemented as linear finite-state machines (LFSM’s). Our approach replaces a given LFSM with a larger, redundant LFSM that preserves the evolution and...

this paper presents the design procedure and implementation results of a proposed hardware which performs different satellite image compressions using fpga xilinx board. first, the method is described and then vhdl code is written and synthesized by ise software of xilinx company. the results show that it is easy and useful to design, develop and implement the hardware image compressor using ne...

A key objective of the IBM Intelligent Bricks project is to create a highly reliable system from commodity components. We envision such systems to be architected for a service model called fail-inplace or deferred maintenance. By delaying service actions, possibly for the entire lifetime of the system, management of the system is simplified. This paper examines the hardware reliability and defe...

New regulatory safety standards will soon require unmanned aircraft systems to meet high levels of reliability. There is potential to increase the reliability of such systems without necessarily increasing the number of hardware components. This paper motivates a mix of physical and analytical redundancy in order to increase the system-level reliability of a small unmanned aircraft. The aircraf...

In order to modernize their infrastructure and keep up with the state of the art, ABB Power Systems decided to replace the older controller AC450 with a new generation of controllers called AC800M. Just like its predecessor, its main task is to work as a sequencer in an otherwise mostly unchanging topology. Although the new controller AC800M provides modern communication features and a sophisti...

N-modular redundancy (NMR) is commonly used to enhance the fault tolerance of a circuit/system, when subject to a fault-inducing environment such as in space or military systems, where upsets due to radiation phenomena, temperature and/or other environmental conditions are anticipated. Triple Modular Redundancy (TMR), which is a 3-tuple version of NMR, is widely preferred for mission-control sp...

The problem of reliability of new object of distributed hardware software (DHS) multi-agent system (MAS) is considered. DHS MAS is determined as a system that is based on agent technologies and consists of both agents and hardware components required for execution of agents and for interaction of agents with an environment. Reliability improvement, fault-recovery and several reliability assessm...