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3 RELATED WORK 3.1 Understanding the System Design Process In order to effect change (hopefully for the better) in the aerospace component development process, it is first necessary to have a clear understanding of how, at least theoretically, the current process is structured. Since this work focuses on understanding and developing product requirements and specifications in the face of uncertainty, it is prudent to review the process from a general point ofview. The issues under investigation are captured in the Concept Development phase as described by Ulrich & Eppinger,1 6 which is shown in Figure 1-7. Drawing a parallel to the PW jet engine development process, the step of establishing target specs, which immediately follows identification of customer needs, is indeed a high level analysis that establishes basic engine-level requirements such as thrust-specific fuel consumption (TSFC), weight, low observability, etc. At this point, the design space for the control system is extremely large since control system requirements are determined primarily by the engine design and the engine design is in its infancy. The next three steps involve concept selection, following which is setting final specifications. At this point, the engine requirements are fairly well known to the point that the major module development plans (including the control system) can be launched. For the next lower level of decomposition (i.e. the major module level), this process can be re-enteredand executed in the same manner that it was at the engine level. The current jet engine development process proceeds through the setting of final specifications for the control system based on analysis and simulation. This hits at the heart of the issue of designing with requirement uncertainty that Ulrich & Eppinger do not address. 16 Ulrich, Karl T. and Steven D. Eppinger, Product Design and Development, McGraw-Hill, Inc., 2000, pg 18. 60PDF Image | Improving Gas Turbine Engine Control System
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