As the strategic importance of information technology (IT) has increased, the decision of where and when to allocate resources to IT programs has become more risky and more difficult. Executives are tempted by the opp...
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The author describes design issues in fault-tolerant vehicle management systems (VMS) for next-generation high-performance aircraft. Unstable aircraft require a highly reliable fault-tolerant computer to perform dynam...
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The author describes design issues in fault-tolerant vehicle management systems (VMS) for next-generation high-performance aircraft. Unstable aircraft require a highly reliable fault-tolerant computer to perform dynamic compensation of effector surface controls. Next-generation system requirements for system availability and performance will extend the role of flight criticality beyond the flight data sensors and actuation control functions. Additional control systems requiring a similar degree of fault tolerance include the primary and secondary electrical power systems, fuel management system, hydraulics control system, propulsion control system, and avionics cooling system. The incorporation of these additional control systems into the flight control system defines the vehicle management system of next-generation aircraft. In addition, the implementation of a VMS for the 1990s will incorporate state-of-the-art hardware technologies including fiber optics, high-speed local area networks, high-voltage application-specific integrated circuits, multiprocessing, smart sensors, liquid-cooled racks, and packaging for two-level maintenance. Software technology will include a multiprocessor ADA fault-tolerant executive, local area network distributed architecture synchronization and network management, and high coverage built-in-test to support two-level maintenance. Architectural and system technologies to be applied include channelized and self-monitored redundancy, integrated flight and propulsion control, centralized and distributed electric actuators, pooled processing centers, expertsystems, and 270 V uninterruptible electrical systems. The goals and accomplishments of some VMS programs are summarized.< >
The purpose of our research is to investigate the feasibility of this methodology for distributed application development by examining possible approaches to carrying out such developments. In particular, our emphasis...
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This paper discusses how the synthesis phase of the PSI system constructs programs from high level program models by using coding knowledge and efficiency knowledge. In our preliminary implementation, these knowledge ...
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