Energy analysis of powertrain and chassis integrated simulation using a military duty cycle

Military drive cycles typically consist of complex terrains, which include rough and deformable surfaces, steep grades, and sharp turns, which is a contrast to the commercial and passenger vehicle cycles. Typically, a one dimensional (1D) powertrain model is utilised to simulate and predict energy usage over a given drive cycle in GT-SUITE. This 1D model does not take into account lateral dynamics, short wavelength excitations, or tyre performance. These omissions are typically valid for straight line simple terrains where transient conditions are minimal. For complex terrains, such as the aforementioned military cycles, these assumptions are no longer valid and chassis dynamics need to be considered. This paper will demonstrate a transient powertrain dynamic model built in GT-SUITE and a comprehensive chassis dynamic model built in MSC.Adams/Car integrated through a co-simulation framework. It will include a detail analysis to describe the effects of the aforementioned phenomena on the vehicle performance.