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This paper presents an approach for co-state initialization which is a crucial step in solving minimum-time low-thrust trajectory optimization problems using indirect optimal control numerical methods. Indirect methods used in determining the optimal space trajectories result in two-point boundary value problems which are typically solved by single- or multiple-shooting methods. Accurate initialization...
This paper describes a method of recovering linear controllability of an underactuated spacecraft by accounting for the effects of solar radiation pressure (SRP) in the spacecraft attitude dynamics model. The developments are based on a spacecraft model with a four wheel reaction wheel array of which two wheels have failed and two wheels are functioning. The model for SRP torque as a function of spacecraft...
This paper considers modeling of vehicle driving conditions using transition probability models (TPMs) for applications of dynamic optimization. The properties of transition probabilities for vehicle speed, vehicle acceleration, and road grade are discussed based on the analysis and experimental vehicle data. The KL-divergence is shown to provide an effective metric that can differentiate similar...
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