Article
Engineering, Aerospace
Jianqing Li, Liangming Chen, Ming Cao, Chaoyong Li
Summary: This article investigates a practical formation control problem of a multisatellite system. A formation control scheme using only angle measurements is proposed to form the desired configuration. The stability of the determined final configuration is guaranteed by utilizing the sum of interior angles of polygons being a constant. The proposed formation control law does not require inter-satellite relative positions and knowledge of the communication topology.
IEEE TRANSACTIONS ON AEROSPACE AND ELECTRONIC SYSTEMS
(2023)
Article
Engineering, Aerospace
Francesca Scala, Gabriella Gaias, Camilla Colombo, Manuel Martin-Neira
Summary: This paper presents a strategy for optimal manoeuvre design of multi-satellite formation flying in low Earth orbit environment, focusing on continuous low-thrust control profile and dynamic representation, applicable to various low Earth orbit missions.
ADVANCES IN SPACE RESEARCH
(2021)
Article
Automation & Control Systems
Yongxia Shi, Qinglei Hu, Dongyu Li, Maolong Lv
Summary: This article presents a solution to the event-triggered optimal tracking control problem for leader-follower spacecraft formation flying system using adaptive dynamic programming. The Hamilton-Jacobi-Bellman equation is solved using a single-critic neural network to approximate the optimal cost function. A semiglobal adaptive update law is derived to tune the critic neural network, and an input-state-dependent event-triggered mechanism is designed to reduce the execution frequency of the control command. Theoretical scheme is validated through numerical simulations on two formation satellites in low Earth orbit.
IEEE TRANSACTIONS ON INDUSTRIAL INFORMATICS
(2023)
Article
Engineering, Electrical & Electronic
Ruoqi Deng, Boya Di, Lingyang Song
Summary: The article discusses a downlink ultra-dense LEO-based multi-terminal satellite system using a dense satellite constellation to achieve high channel capacity. The research explores how satellite distribution and formation size affect channel capacity, with simulation results confirming theoretical analysis. The findings apply to both single-antenna and general multi-antenna satellite cases.
IEEE TRANSACTIONS ON COMMUNICATIONS
(2021)
Article
Engineering, Aerospace
Peerawat Artitthang, Ming Xu, Mingpei Lin, Yanchao He
Summary: This paper presents a robust optimal sliding mode control method to tackle the problem of thruster saturation in Coulomb spacecraft formation flying. The robust controller is designed based on optimal control theory and augmented with integral sliding mode control technique. The stability of the closed-loop system is guaranteed using the second Lyapunov method. The developed controller outperforms existing ones in coping with uncertainty and numerical simulations confirm its efficiency.
ADVANCES IN SPACE RESEARCH
(2023)
Article
Automation & Control Systems
Zhifeng Gao, Yuechao Shan, Haikuo He
Summary: In this paper, the distributed attitude synchronization control problem is addressed for a satellite formation flying system (SFFS) with external disturbance and actuator misalignment. An adaptive terminal sliding mode control (ATSMC) technique is used to handle the problem. The satellite attitude system model is transformed into a lagrange nonlinear system, and a novel adaptive terminal sliding mode control scheme based on neural networks is proposed to achieve satisfactory formation flying performance in the presence of external disturbance. The control scheme is extended to handle the actuator misalignment case, and the stability and synchronization of the whole closed-loop SFFS are proven using Lyapunov stability theory. Simulation results are provided to demonstrate the effectiveness and superiority of the proposed control strategy.
INTERNATIONAL JOURNAL OF DYNAMICS AND CONTROL
(2022)
Article
Engineering, Aerospace
Tao Nie, Pini Gurfil
Summary: The study explores a new approach for low-thrust orbit control by creating artificial resonance to improve efficiency and save fuel. A resonant-control candidate for efficiently changing all mean orbital elements is proposed, along with four decoupling control laws designed for this purpose.
JOURNAL OF GUIDANCE CONTROL AND DYNAMICS
(2021)
Article
Automation & Control Systems
Li Chen, Yongyan Sun, Xiaowei Shao, Junli Chen, Dexin Zhang
Summary: This paper investigates the problem of prescribed-time spacecraft formation flying under known and unknown external disturbance. The kinematics and dynamics of the spacecraft are modeled using exponential coordinates of SE(3). A novel global adaptive prescribed-time time-varying high-gain control law is designed based on the linear time-varying Lyapunov inequality and backstepping. Numerical simulations confirm the effectiveness of the proposed control method.
INTERNATIONAL JOURNAL OF CONTROL AUTOMATION AND SYSTEMS
(2023)
Article
Engineering, Chemical
Gexin Chen, Huilong Liu, Pengshuo Jia, Gengting Qiu, Haohui Yu, Guishan Yan, Chao Ai, Jin Zhang
Summary: A nonlinear adaptive backstepping control method was proposed to address parameter uncertainty in an electro-hydraulic servo closed-loop pump control system, improving control accuracy and robustness. Experimental results confirmed the effectiveness of the control strategy, achieving high precision control with steady-state accuracy of +/- 0.02 mm, laying a solid foundation for the engineering application and promotion of the pump control system.
Article
Engineering, Aerospace
Zengfu Wang, Jiarui Tian, Jing Fu
Summary: We aim to minimize or balance fuel consumption in the satellite formation reconfiguration process within a fixed orbit transfer time. Regardless of the initial state, the formation will eventually result in an in-plane formation. We consider constraints such as relative motion equation, initial and terminal states, collision avoidance, and maximum thrust. By introducing an unknown offset in the terminal state and using a convex-programming-based iterative approach, we successfully optimize both fuel usage and the offset of the formations, outperforming benchmarks in all numerically tested situations.
ADVANCES IN SPACE RESEARCH
(2023)
Article
Automation & Control Systems
Hao Liu, Yu Tian, Frank L. Lewis
Summary: This study addresses the robust time-varying formation control problem for a group of satellites, proposing a formation flying controller using static state feedback control strategy and disturbance estimation theory to achieve satellite attitude consensus and desired formation patterns and trajectories. The robustness analysis shows that the trajectory and attitude tracking errors of the global closed-loop control system can converge into a given neighborhood of the origin in a finite time. Numerical simulation results validate the effectiveness and advantages of the proposed formation flying controller.
IEEE TRANSACTIONS ON CYBERNETICS
(2021)
Article
Engineering, Aerospace
Bojian Liu, Aijun Li, Yong Guo, Changqing Wang
Summary: This paper addresses the adaptive distributed finite-time formation control problem for multi-UAVs with collision avoidance and input saturation. It proposes a novel adaptive finite-time control law and constructs an improved auxiliary dynamic system to solve the input saturation problem.
AEROSPACE SCIENCE AND TECHNOLOGY
(2022)
Article
Engineering, Aerospace
Ahmed Mahfouz, Gabriella Gaias, D. M. K. K. Venkateswara Rao, Holger Voos
Summary: This paper addresses the problem of autonomous optimal absolute orbit keeping for a satellite mission in Low Earth Orbit using electric propulsion. By developing an attitude guidance algorithm specific for orbit maneuver and a Model Predictive Control scheme, the optimal guidance profiles for satellite state, reference attitude, and thrust magnitude are obtained.
Article
Engineering, Aerospace
Chao Xiao, Yong Guo, Cheng-qing Xie, Ai-jun Li, Chang-qing Wang
Summary: This paper investigates the attitude coordination control issue for spacecraft formation flying in the presence of actuator saturation and external disturbances with unknown boundaries. A super-twisting integral terminal sliding mode surface is developed to ensure convergence to zero in finite time. Based on the developed sliding mode surface and adaptive technique, a robust anti-saturation distributed attitude coordination controller is devised to track the desired time-varying command in finite time under undirected communication topology.
ADVANCES IN SPACE RESEARCH
(2023)
Article
Engineering, Aerospace
Mason E. Nixon, Yuri B. Shtessel
Summary: This article considers the control of a perturbed satellite formation antenna array with dual quaternion dynamics. It proposes three novel dual quaternion-based adaptive continuous sliding mode control algorithms and verifies their effectiveness through simulations and comparisons with traditional methods.
IEEE TRANSACTIONS ON AEROSPACE AND ELECTRONIC SYSTEMS
(2022)
Article
Engineering, Aerospace
A. I. Krikunova, A. D. Cheshko, V. V. Krivets
Summary: Fire safety is crucial for the development of efficient and safe energy systems for space objects. This paper focuses on studying the influence of gravity on combustion processes and analyzes the dynamics of inverted conical methane-air flame under external acoustic excitation. The results show that at high excitation frequencies, the intensity of vortex generation is similar to that observed in experiments with normal gravity, indicating the dominance of acoustic mechanism. Additionally, at an external excitation frequency of 240 Hz, significant growth in shear vortex diameters and increased amplitude of perpendicular oscillations of flame branches were observed, indicating the most intensive large scale instability of flow.
Article
Engineering, Aerospace
Liya Huang, Mingquan Gong, Jiarui Zhang, Kun Liang, He Yang
Summary: Metallized gel propellants with exceptional stability and remarkable shear-thinning properties were successfully synthesized by utilizing cooperative hydrogen bonding between polymer octanoyl cellulose and the small Thixatrol ST molecule.
Article
Engineering, Aerospace
Clemence Poirier, Michelle Hermes, Marco Aliberti
Summary: This paper examines the role of space-based data in European climate policies and assesses the barriers to the use of space technology in climate policymaking in European countries. The research findings indicate that while satellite data is crucial for scientific research and climate policies, the role of space is not accurately reflected in European climate policies.
Article
Engineering, Aerospace
Yan-mei Zhou, Ji-ping Wu, Wei Huang, Gautam Choubey
Summary: This study investigates the combustion performance of sinusoidal pulsed jets in supersonic flows using numerical simulations. It is found that the pulsed jets can significantly improve combustion efficiency.
Article
Engineering, Aerospace
Wang Zhao, Shujun Tan, Yiliang Guo
Summary: This study proposes an adaptive Pogo active suppression controller design method that utilizes measured acceleration as feedback. The eigenspace transformation theory is employed to design dimensional reduced models for observer and adaptive controller, effectively addressing the issues of model parameter uncertainty and time-varying parameters. Simulation analysis of a certain type of rocket demonstrates the effectiveness of the proposed method.
Article
Engineering, Aerospace
A. V. Nebylov, V. A. Nebylov
Summary: This article discusses the safety issues of astronauts during the landing process and investigates how rescuers can effectively carry out rescue missions. The article also takes into account the special maritime conditions of the Vostochny cosmodrome.
Article
Engineering, Aerospace
Pietro Davide Maddio, Rosario Sinatra, Alberto Meschini, Riccardo Rigato, Marco Lapi, Davide Scarozza, Alessandro Cammarata
Summary: This study aims to develop a versatile cable net generation algorithm for designing offset cable nets in parabolic reflectors. The study proposes a methodology that leverages quasi-geodesic curves and introduces two types of these curves. The study also presents various solutions for different cable net layouts and introduces a quality index based on an equilateral triangle cable net.
Article
Engineering, Aerospace
Nahum Melamed, Tom Heinsheimer
Summary: Traditional methods of asteroid trajectory modification rely on impact or nuclear detonation, while centrifugal propulsion offers an alternative approach. The centrifuge system lands on the asteroid and gradually adjusts the trajectory using momentum transfer. This method allows for flexibility in operation parameters and has the potential to be used in planetary defense and other space missions.
Article
Engineering, Aerospace
Andrew Barth, Ou Ma
Summary: As humans continue to explore the surfaces of the Moon and Mars, the use of distributed heterogeneous robot teams can increase the chances of success by utilizing the complementary capabilities and synergy of the team members. Effective cooperation and collaboration between the members of a robot team is crucial, but defining a metric for effective cooperation is challenging. This paper presents a method for determining reward criteria that can be used for training robot swarm through reinforcement learning techniques. The trained robot team exhibits high success rates and cooperative behavior in test environments, demonstrating the robustness and scalability of the training strategies.
Article
Engineering, Aerospace
Kaijie Zhu, Qiquan Quan, Dewei Tang, Yachao Dong, Kaiyi Wang, Bo Tang, Qi Wu, Zongquan Deng
Summary: This study proposes a deployable Mars quadcopter for air patrol and sampling missions. By describing its structure, avionics architecture, and autonomous flight control method, it provides a feasible framework for future Mars flight sampling missions.
Article
Engineering, Aerospace
Avishai Melamed, Adi Rao, Sarah Kreps, Erika Palmer
Article
Engineering, Aerospace
Colin Hunter, Avinkrishnan Vijayachandran, Anthony M. Waas
Summary: Deployable structures inspired by origami have gained significant prominence in space applications. Recent advancements in multi-material additive manufacturing have opened new possibilities for the fabrication of monolithic structures. This paper presents a novel framework for designing deployable structures using viscoelastic hinges incorporated into rigid plates. Experimental results demonstrate the effectiveness and feasibility of these hinge designs in real-world applications.
Article
Engineering, Aerospace
Aleksander V. Efremov, Mikhail S. Tiaglik, Aleksey S. Tiaglik, Iliyas Kh Irgaleev, Tatyana V. Voronka
Summary: Theoretical and experimental studies were conducted to determine the best kind of information presented on a predictive display for the highest accuracy in space mission execution, while considering reduced propellant consumption.
Article
Engineering, Aerospace
Fuwen Liang, Long Miao, Feng Tian, Jiahui Song, Ningfei Wang, Xiao Hou
Summary: This study investigates the influence of deployment friction on the dynamic characteristics of nonconductive space tether through experimental measurement and numerical simulation. The results show that deployment friction significantly limits the uncontrolled tether deployment, while increasing the initial deployment velocity and satellite effective mass, as well as decreasing orbital altitude, can enhance the deployment capability and dynamic stability. In addition, an optimal matching relationship between tether length and satellite total mass is proposed, which is of substantial importance for the design of nonconductive space tether systems.
Article
Engineering, Aerospace
Amirah R. Algethami, Colin R. McInnes, Matteo Ceriotti
Summary: This paper utilizes the Hill's approximation model to manipulate the relative motion of two asteroids by three impulses, resulting in their bound binary motion in Earth's orbit. The feasibility of this strategy is demonstrated, and potential applications for parking small captured near-Earth asteroids in Earth's orbit are discussed.