New smoothing techniques for solving bang–bang optimal control problems—numerical results and statistical interpretation

By R. Bertrand, R. Epenoy. 2002

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The researchers whose trusted networks rank it highest, strongest advocate first. Every researcher gets a different order.

Practical Techniques for Low-Thrust Trajectory Optimization with Homotopic Approach (2012, methodology): “Through lots of simulations, four local solutions s, s1, s2, and s3 are found, as listed in Table 3, where the former three solutions are identical to the results of [9], but the last one is a new discovery.”
Low-Thrust Minimum-Fuel Optimization in the Circular Restricted Three-Body Problem (2015, methodology): “A smoothing technique, or homotopic approach, was introduced in [26] to relax the control profile and to enforce discontinuity in a gradual way [34].”
Homotopic approach and pseudospectral method applied jointly to low thrust trajectory optimization (2012, methodology): “The optimal thrust and optimal trajectory obtained by our hybrid technique here seem the same as those in [18,20].”