Optimal Conceptual Design of Two-Stage Reusable Rocket Vehicles Including Trajectory Optimization

2004 ◽  
Vol 41 (5) ◽  
pp. 770-778 ◽  
Author(s):  
Takeshi Tsuchiya ◽  
Takashige Mori
Keyword(s):  
Conceptual Design ◽  
Trajectory Optimization ◽  
Two Stage

scholarly journals Two-Stage Pursuit Strategy for Incomplete-Information Impulsive Space Pursuit-Evasion Mission Using Reinforcement Learning

Aerospace ◽  
2021 ◽  
Vol 8 (10) ◽  
pp. 299
Author(s):  
Bin Yang ◽  
Pengxuan Liu ◽  
Jinglang Feng ◽  
Shuang Li
Keyword(s):  
Reinforcement Learning ◽  
Incomplete Information ◽  
Trajectory Optimization ◽  
Game Problem ◽  
Gradient Algorithm ◽  
Two Stage ◽  
Pursuit Evasion ◽  
Evasion Game ◽  
Close Distance ◽  
Pursuit Strategy

This paper presents a novel and robust two-stage pursuit strategy for the incomplete-information impulsive space pursuit-evasion missions considering the J2 perturbation. The strategy firstly models the impulsive pursuit-evasion game problem into a far-distance rendezvous stage and a close-distance game stage according to the perception range of the evader. For the far-distance rendezvous stage, it is transformed into a rendezvous trajectory optimization problem and a new objective function is proposed to obtain the pursuit trajectory with the optimal terminal pursuit capability. For the close-distance game stage, a closed-loop pursuit approach is proposed using one of the reinforcement learning algorithms, i.e., the deep deterministic policy gradient algorithm, to solve and update the pursuit trajectory for the incomplete-information impulsive pursuit-evasion missions. The feasibility of this novel strategy and its robustness to different initial states of the pursuer and evader and to the evasion strategies are demonstrated for the sun-synchronous orbit pursuit-evasion game scenarios. The results of the Monte Carlo tests show that the successful pursuit ratio of the proposed method is over 91% for all the given scenarios.

Conceptual Design Study of Two-Stage Hypersonic Scramjet Vehicle

2012 ◽  
Vol 16 (1) ◽  
pp. 16-24
Author(s):  
Kyung-Jae Lee ◽  
Sang-Hun Kang ◽  
Soo-Seok Yang ◽  
Chul Park
Keyword(s):  
Conceptual Design ◽  
Design Study ◽  
Two Stage

scholarly journals Trajectory optimization of an oscillating industrial two-stage evaporator utilizing a Python-Aspen Plus Dynamics toolchain

2020 ◽  
Vol 155 ◽  
pp. 12-17
Author(s):  
Mikael Yamanee-Nolin ◽  
Niklas Andersson ◽  
Bernt Nilsson ◽  
Mark Max-Hansen ◽  
Oleg Pajalic
Keyword(s):  
Trajectory Optimization ◽  
Aspen Plus ◽  
Two Stage
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