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
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
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
Xinyuan Liu, Qingzhen Yang, Hongbo Hu, Yongqiang Shi, Haoqi Yang
Summary: In this study, a multi-objective optimization design of shock-focusing initiator was conducted using Computational Fluid Dynamics (CFD). The results showed that the best initiator reduced the threshold of the incident shock Mach number, decreased the pressure of the corresponding driver gas, and shortened the focusing delay time.
Article
Engineering, Aerospace
L. Olivieri Lorenzo, C. Giacomuzzo, A. Francesconi
Summary: This article describes an impact experiment on a solar array conducted by the University of Padova, with a focus on the analysis of the generated fragments. The results indicate that material and manufacturing choices significantly affect the size and shape distributions of the fragments.
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
Avishai Melamed, Adi Rao, Sarah Kreps, Erika Palmer
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
Y. Z. Huanga, Yin Yua, Y. L. Hua, Z. Y. Yaoa, Dan Wu
Summary: In this study, a multi-physical analysis approach based on peridynamics is proposed to simulate the stripping process during ablation of C/C composite material. The methodology considers aerodynamic parameters, heat flux distribution, energy balance on the ablative wall, and includes solving equations for temperature field and mass conservation of surface elements. The effectiveness of the approach is verified using a C/C one-dimensional model, and the results agree well with experimental observations. Furthermore, the methodology is applied to predict the exterior shape and temperature field of a hypersonic vehicle nose tip, when considering fluid dynamics, chemical reaction, heat transfer, and ablation recession.
Article
Engineering, Aerospace
Lorenzo Federici, Alessandro Zavoli
Summary: This paper explores the application of meta-reinforcement learning in the robust design of low-thrust interplanetary trajectories under multiple uncertainties. It uses a deep recurrent neural network to approximate the control policy and adapts it to different stochastic scenarios through training.
Article
Engineering, Aerospace
Samuel T. Hart, E. Glenn Lightsey, Alvaro Romero-Calvo
Summary: Low gravity fluid management is crucial for spaceflight applications. This paper explores the application of various devices for conformal propellant tanks, such as capillary, magnetic, thermal, and dielectrophoretic fluid management devices. Through evaluation based on performance and requirements, thermomagnetic and thermodielectrophoretic devices are found to be the most suitable.
Article
Engineering, Aerospace
Andre F. P. Ribeiro, Carlos Ferreira, Damiano Casalino
Summary: This study compares a filament-based free wake panel method to experimental and validated numerical data in order to simulate propeller slipstreams and their interaction with aircraft components. The results show that the free wake panel method is able to successfully capture the slipstream deformation and shearing, making it a useful tool for propeller-wing interaction in preliminary aircraft design.
AEROSPACE SCIENCE AND TECHNOLOGY
(2024)
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
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
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
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
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
Sven Kaltenhaeuser, Carmo Kluenker, Dirk -Roger Schmitt
Summary: The frequency of commercial space launch and re-entry operations is increasing worldwide. To ensure air traffic safety, providing accurate information to stakeholders is crucial. Through a cooperative agreement, the FAA and DLR are sharing capabilities to improve situational awareness through real-time data exchange. The project evaluates the impact of non-nominal events on airspace systems and develops a demonstration model for launch scenarios. The research shows that systems on both sides of the Atlantic can be connected and information can be shared through standardized protocols.
