For a returnable hypersonic cruise vehicle, the whole trajectory design is strongly coupled to the cruise state. To deal with the coupling relationship, a bilevel trajectory optimization problem is proposed in this paper. The upper level is for single-objective optimization of the whole trajectory, whereas the lower level is to conduct multiobjective optimization of the cruise flight. Based on the bilevel directed search domain (BDSD) algorithm, a bilevel trajectory optimization approach is proposed. Firstly, the dynamics model is established according to the coupling among the propulsion, aerodynamics, and trajectory. Then, the coupling relationships among different flight phases and those between the cruise trajectory and operate window of the scramjet are converted to optimization constraints. Thus, the highly coupled bilevel trajectory problem is transformed into a decoupled bilevel optimization problem, enabling the BDSD algorithm to solve the problem. Finally, the availability of the proposed approach is verified by the numerical results. Compared with another efficient method, the approach presented in this paper can drastically reduce the optimization time from tens or even hundreds of days to only about 8 days. Because of the high efficiency of the approach, the iterative trajectory design at the conceptual design stage is possible.
Bilevel Trajectory Optimization for Hypersonic Cruise Vehicle Using Bilevel Directed Search Domain
Journal of Spacecraft and Rockets ; 58 , 2 ; 375-385
01.03.2021
Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch
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