The U.S. Army and the Defense Advanced Research Projects Agency (DARPA) are currently supporting the development of conceptual military vehicle designs capitalizing on maturing technologies associated with hybrid electric vehicle propulsion and advanced electrical loads. Preliminary trade studies associated with these concepts often focus on determining the "best" mix of power system components to achieve the desired performance levels at a minimum overall impact on the vehicle. This paper describes an approach to this optimization through the use of vehicle performance simulation. By using simulation, we can address the complex relationship between the mission needs and the required subsystem performance in a dynamic environment. Results for three fictional mission sequences are provided to show how simulations can be used to insure that complex performance goals are met with minimum subsystem sizes. These minimum sizes can then form a baseline for further sizing constraints based on arrangements, availability, and other design considerations while minimizing over design.
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