Second-order and Second-variation Methods for Determining Optimal Control: A Comparative Study using Differential Dynamic Programming†
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Second-variation methods for computing optimal control exhibit more rapid convergence than first-variation methods but at the exponse of vastly increased computing effort. In this paper two second-order algorithms for determining optimal control are derived using the notion of differential dynamic programming, which is also used to re-derive the well known second-variation method. This unified treatment allows the differences between the three algorithms to be studied in detail. It is shown that the second-order algorithms are more accurate than the second-variation method and, moreover, that one of these algorithms is simpler to implement.
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