A sliding mode wheel slip controller is the subject of this paper. The proposed wheel slip controller was based on a quarter-car model and a friction force observer was applied to ensure the robustness of the controller with respect to the estimation error. It was applied to a non-linear full vehicle model. This controller showed good longitudinal performance in tracking reference slip ratio regardless of modelling errors and disturbances. However, when cornering was combined with braking or there was a yaw moment disturbance due to a í-split road, it was diYcult to achieve the desired performance using this controller. In this case, lateral motion must be considered in maintaining the control of the vehicle. A yaw moment control method using the modi ed reference yaw rate was investigated. The eVectiveness of this control theory was veri ed through simulations of emergency manoeuvres using a developed non-linear full vehicle Simulink model.
A value-centric system design tool has been developed as part of the DARPA F6 (Future Fast, Flexible, Fractionated, Free-Flying Spacecraft united by Information eXchange) Phase 1 architecture studies. This System Value Modeling (SVM) tool supports F6 Program goals by aiding value-centric systems engineering decision-making in the areas of architecture design, technology inclusion, and risk mitigation approaches. SVM evaluates the net present value utility, variance, cost and revenue of the candidate fractionated architectures as applied to a design reference mission using a combination of two methods: Generalized Information Network Analysis (GINA) and Time-Expanded Decision Networks (TDN). The tool is designed to be modular to allow for piece-wise improvement of model fidelity, and covers all aspects of the fractionated system's design, development, deployment, and
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