Article
Engineering, Aerospace
Youngkwang Kim, Sang-Young Park, Pureum Kim
Summary: This study presents a novel impulsive trajectory optimization algorithm called AIRTOP for near-fuel-optimal rendezvous under perturbations. AIRTOP is designed to improve the accuracy of rendezvous constraints while retaining first-order optimality, considering various orbital perturbations. To eliminate constraint errors, AIRTOP solves the linearized impulsive rendezvous problem recursively using the dual-primal optimization algorithm. Three numerical simulations near circular and elliptical orbits demonstrate the effectiveness and computational efficiency of AIRTOP compared to other methods.
JOURNAL OF GUIDANCE CONTROL AND DYNAMICS
(2023)
Article
Engineering, Aerospace
Michelle Chernick, Simone D'Amico
Summary: This paper introduces a methodology to achieve spacecraft relative orbit reconfiguration in a short time by minimizing the cost of impulsive control actions to reach a desired state, using reachable set theory to convert the cost-minimization problem into a geometric path-planning problem. The methodology computes maneuver schemes that meet a new optimality criterion, providing globally optimal solutions in orbits of arbitrary eccentricity and quantifiably suboptimal solutions when optimal solutions are unreachable. The impact of uncertainties on achieving the desired end state and their effects on the reachable set are also determined and visualized. The proposed algorithms are tested and validated in realistic reconfiguration scenarios in a high-fidelity computational simulation environment.
JOURNAL OF GUIDANCE CONTROL AND DYNAMICS
(2021)
Article
Astronomy & Astrophysics
Minghu Tan, Ke Zhang, Jingyu Wang
Summary: Low-energy bi-impulsive Earth-Moon transfers are studied using periodic orbits with two design strategies proposed in the CR3BP. Optimizations based on the Gradient Descent method show that transfers in the CR3BP can approximate those in the BCM, with potential lower cost in terms of velocity impulse.
ASTROPHYSICS AND SPACE SCIENCE
(2021)
Article
Engineering, Aerospace
Marco Bassetto, Alessandro A. Quarta, Andrea Caruso, Giovanni Mengali
Summary: This study analyzes the optimal heliocentric transfers of a Sun-facing heliogyro and calculates the minimum flight times in two-dimensional heliocentric transfers. The proposed thrust vector model is used for trajectory optimization, discussing various exemplary cases.
AEROSPACE SCIENCE AND TECHNOLOGY
(2021)
Article
Engineering, Aerospace
Yuxian Yue, Honglei Shan, Ziwei Zhou, Xiaohui Wang
Summary: This paper presents an effective method to assess the accessibility and exploration window of large-number asteroids, simplifying the exploration window search problem through the theory of cotangential transfer orbits and the concept of rendezvous difference angle.
Article
Engineering, Aerospace
Bowen Hou, Dayi Wang, Jiongqi Wang, Dongming Ge, Haiyin Zhou, Xuanying Zhou
Summary: The paper introduces a one-step optimal maneuver solution method, which considers various constraints based on an optimization problem and practical engineering requirements to improve the state estimation accuracy in relative navigation.
JOURNAL OF GUIDANCE CONTROL AND DYNAMICS
(2021)
Article
Physics, Particles & Fields
Jiliang Jing, Weike Deng, Sheng Long, Jieci Wang
Summary: This article introduces the difficulties of self-consistency in the effective-one-body theory and proposes a solution by fixing the parameter freedoms of the effective metric through decoupling the null tetrad component of the gravitationally perturbed Weyl tensor.
EUROPEAN PHYSICAL JOURNAL C
(2023)
Article
Operations Research & Management Science
Thomas Carter, Mayer Humi
Summary: This study addresses the optimal impulsive transfer between ellipses in a Newtonian gravitational field through variable transformation, introducing new necessary conditions and discussing various transfer methods. It is demonstrated that optimal Bi-Elliptic Transfers can exist when the final time is fixed.
JOURNAL OF OPTIMIZATION THEORY AND APPLICATIONS
(2021)
Article
Automation & Control Systems
Yang Li, Wanchun Chen, Liang Yang
Summary: This article proposes a successive Chebyshev pseudospectral convex optimization method for general nonlinear optimal control problems. By introducing a trust-region penalty term and utilizing a successive convex optimization algorithm, the method aims to improve convergence rate by iteratively solving a convex subproblem with discretized nonlinear dynamic constraints. The derivation of Karush-Kuhn-Tucker conditions for the subproblem and proof of iterative convergence are also highlighted.
INTERNATIONAL JOURNAL OF ROBUST AND NONLINEAR CONTROL
(2022)
Article
Mathematics, Applied
Giordana Bucchioni, Gabriele Gemignani, Francesco Lombardi, Andrea Bellome, Joao Pedro Fernandes Leitao, Stephanie Lizy-Destrez, Mario Innocenti
Summary: This work applies a systematic method to compute an optimal transfer trajectory between two non-Keplerian halo orbits in the Circular Restricted Three-body formulation of the Earth-Moon dynamics. The paper designs optimal multi-impulsive Halo-to-Halo transfers with fixed and limited Time of flight, from every point of the departure orbit to every point of the arrival orbit with an optimal number of impulses, utilizing the knowledge of the natural non-linear dynamics and primer vector theory applied to the Circular Restricted Three Body Problem. The method used aims to facilitate the mission design process and the on-board autonomous guidance implementation of future missions in highly non-linear dynamics.
COMMUNICATIONS IN NONLINEAR SCIENCE AND NUMERICAL SIMULATION
(2023)
Article
Astronomy & Astrophysics
N. V. Emelyanov, B. P. Kondratyev
Summary: The article describes a new method for determining the orbit of a satellite based on measured relative positions and validates its application using various examples.
Article
Operations Research & Management Science
Esmaeil Sharifi, Christopher J. Damaren
Summary: This paper introduces an optimal control design framework for hybrid nonlinear time-dependent dynamical systems. It presents a hybrid version of the Hamilton-Jacobi-Bellman (HJB) equation with time-dependency and develops a computational framework to solve the resultant set of the HJB equations in an interacting manner. The proposed control scheme is applied to spacecraft formation flying, optimizing the use of both Lorentz and impulsive control inputs to reduce expendable chemical fuels and extend space mission duration.
JOURNAL OF OPTIMIZATION THEORY AND APPLICATIONS
(2021)
Article
Engineering, Aerospace
Kenji Kitamura, Katsuhiko Yamada, Takeya Shima
Summary: This study investigates a quasi-time-optimal steering law for low-thrust orbit transfer, which controls the satellite attitude to suppress error and satisfy various constraints. Numerical simulations show that the difference in transfer time is minimal compared to an ideal unconstrained transfer.
Article
Computer Science, Information Systems
C. Treesatayapun
Summary: This paper investigates the drug optimal problem for influenza A virus treatment by addressing challenges such as reducing data collection and minimizing drug usage in a negative control direction. By establishing an equivalent model and designing an impulsive optimal controller, the study demonstrates the feasibility of drug treatment control without specific patient and drug dynamics knowledge.
INFORMATION SCIENCES
(2021)
Article
Multidisciplinary Sciences
Binoy K. Hazra, Banabir Pal, Jae-Chun Jeon, Robin R. Neumann, Boerge Goebel, Bharat Grover, Hakan Deniz, Andriy Styervoyedov, Holger Meyerheim, Ingrid Mertig, See-Hun Yang, Stuart S. P. Parkin
Summary: The generation of a robust spin current with both in-plane and out-of-plane spin polarization is demonstrated in epitaxial thin films of the chiral antiferromagnet Mn3Sn in proximity to permalloy thin layers. The in-plane polarized spin current is generated from the interior of Mn3Sn and follows its temperature dependence, while the out-of-plane polarized spin current arises from the spin swapping effect at the Mn3Sn/permalloy interface.
NATURE COMMUNICATIONS
(2023)
