Robust concept exploration of propulsion systems with enhanced model approximation capabilities

Improvements in industrial productivity require the creation of a reliable design in the shortest possible time. This is especially significant for designs that involve computer intensive analyses. The Robust Concept Exploration Method (RCEM) embodies a systematic approach to configuring complex engineering systems in the early stages of product design by introducing quality considerations based on the robust design principle. Approximation techniques are employed in the RCEM to replace intensive analysis programs for saving computational time and cost, thereby increasing the efficiency of the design process. In this paper, the applicability of the RCEM for multiobjective complex systems design is examined by applying it to the propulsion system conceptual design process at Pratt and Whitney. Various approximation techniques are studied and a new strategy is proposed to enhance the existing model approximation techniques embodied in the RCEM.