| In avionics and military systems, systems may encounter obsolescence problems even before they are fielded and always during their support life. Manufacturing that takes place over long periods of time exacerbates this problem.;This thesis describes a methodology and its implementation for determining the hardware part obsolescence impact on life cycle sustainment costs for system software based on future production projections, maintenance requirements and part obsolescence forecasts. The methodology extends the MOCA (Mitigation of Obsolescence Cost Analysis) methodology/tool that determines the optimum design refresh plan during the field-support-life of the product in order to minimize life cycle cost. The design refresh plan consists of a set of design refresh activities and their respective calendar dates. The methodology incorporates the use of two software commercial cost analysis models: PRICE S and COCOMO.;The methodology developed in this thesis has been validated using a Navy test case (VH-60N Digital Cockpit Upgrade Program). It has also been applied to Honeywell International, Inc.'s AS900 engine controller. (Abstract shortened by UMI.)... |
