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24 Military Jet Engine Acquisition cost-estimating relationships to get an accurate cost prediction of each of the engine classes included in the scope of the CER. The engine community also uses parameters to rate the quality and performance of individual components (e.g., the “combustor effi- ciency” measures the fraction of the injected fuel that is burned.) However, component efficiencies will normally not be used as inde- pendent variables in high-level CERs because they are too detailed, and their values are normally not known precisely until the engine design is quite mature. Therefore, these parameters are beyond the scope of this report and will not be discussed further. Nevertheless, as military requirements and society’s expectations change, new design constraints and corresponding metrics are cre- ated. For example, both the society at large and the military have ex- pressed compelling arguments to reduce jet engine smoke, chemical pollutants, and noise, and metrics are now used to quantify noise and emissions levels. Similarly, stealth and thrust-vectoring require- ments have led to the development of new engine design constraints and metrics. In addition, rapid progress in sensor and computer pro- cessing technologies is providing the opportunity to integrate health monitoring, diagnostic, and prognostic capabilities on jet engines, which will lead to additional durability and reliability metrics. This phenomenon of new and unrelated factors influencing an en- gine’s life-cycle costs has implications for engine CERs covering de- velopment, production, and operations and support. While these and other new factors could increase or decrease costs, it is nearly impossible to identify every future cost driver when a CER is being developed. However, if the CERs are based only upon the traditional performance metrics, they cannot reflect the influences of new fac- tors on costs. Therefore, the CERs should also have some ability to reflect new design factors generically, without one having to know precisely what these factors are when the CERs are defined. The ap- proach to capturing these design factors and other advances in en- gine CERs is addressed in Chapter Six.PDF Image | Military Jet Engine Acquisition Technology Basics and Cost-Estimating Methodology
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