Finite element model updating in structural dynamics

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The NFF rate for avionics systems is between 20% and 50%.The practice of avionics operation and maintenance confirms the relevance of assessing the impact of intermittent faults on the maintenance cost and the choice of such option of the maintenance management, in which the negative impact of the intermittent faults is minimized.The method and software have been applied successfully to several configurations including the Lockheed-Martin N 2 supersonic configuration and the Royal Institute of Technology (KTH, Sweden) generic wind-tunnel model, among others.

Key maintenance effectiveness indicators are selected. General mathematical expressions are obtained for the average availability, mean time between unscheduled removals (MTBUR), and expected maintenance cost of single unit and redundant avionics systems, which are subject to permanent failures and intermittent faults.

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Using the NASA FUN3D computational fluid dynamic (CFD) code, full and ROM aeroelastic solutions are computed at several Mach numbers and presented in the form of root locus plots.

The use of root locus plots will help reveal the aeroelastic root migrations with increasing dynamic pressure.

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