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Aircraft Turbine Engine Development 129 cess. Tools such as CAD/CAM, finite element models to evaluate in- ternal stresses in solid components, CFD models to optimize internal aerodynamics and combustion processes, and many others enable engineers to complete many more design iterations before reaching an optimal design solution. Sophisticated design and test tools also enable engineers to react much more quickly when testing yields an unexpected result, and system deficiencies are identified through modeling and simulation rather than during operation in the field. However, because the predictive ability of these tools is so much better, more technical problems are identified earlier in the process. Resolution of these design problems, which once occurred post- development, absorbs some of the development time and cost saved by the efficiency of the tools. A more significant portion of the time savings, however, is absorbed by the more complex technology required to meet ever-increasing demands for performance and durability. As a result, these tools help produce a much better per- forming, more reliable, and more predictable product for the opera- tor and maintainer but do not necessarily save time or money during the development phase. A NOTIONAL DEVELOPMENT TEST PLAN For purposes of this discussion, a notional development test plan9 for a military aircraft turbine engine entering development at a low level of technology risk is depicted in Figure C.2. Obviously, this is meant only as an example of what a typical, straightforward engine development plan might include. It is not meant to be a generic template for all programs to follow. Formulation of an engine devel- opment test plan is a complex, program-specific process, and plans ______________ 9Skira (1999) provides a detailed discussion of notional engine test plans and what can be done to improve the cost and schedule resources required to qualify an engine. Using a weighted average approach, Skira first formulates a “baseline” notional engine development program that spans ten years, requires 14 test assets, and 11,000 hours of engine test. Upon incorporating the benefits of advanced design tools, materials, and processes, his method yields a significantly streamlined program, spanning 5.5 years, and using nine test assets and 7,550 engine test hours. The notional plan shown in this report is meant to familiarize one with what a more typical program may require.PDF Image | Military Jet Engine Acquisition Technology Basics and Cost-Estimating Methodology
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