Article
Engineering, Aerospace
Nikola Schmidt
Summary: Planetary defense refers to activities and actions to predict and mitigate a potential impact by an asteroid or comet on the Earth. The current state of global PD governance depends on the willingness of space-faring states, but without solid governance, decision-making could be contingent, leading to unpredictable policy implications. This paper studies the evolution of PD governance and proposes a multilateral PD security regime as a solution.
Article
Engineering, Aerospace
Alberto Fossa, Roberto Armellin, Emmanuel Delande, Matteo Losacco, Francesco Sanfedino
Summary: This paper presents an algorithm for improving the robustness of orbit determination tools through the preprocessing of observation data. The algorithm progressively reduces the uncertainty in the initial estimate by utilizing sensor data and detects outliers in the processed measurements. It uses differential algebra techniques and a novel automatic domain splitting algorithm to efficiently propagate uncertainties over time and employs a multifidelity approach to minimize computational effort while maintaining accuracy. The algorithm's effectiveness is demonstrated using synthetic and real observation data for a geostationary transfer orbit object.
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
Carlos Patino, Santiago Ruiz, Daniel Gomez, Alejandro Cruz, Shirley J. Dyke, Julio Ramirez
Summary: This study highlights the importance of considering seismic loads in the design of lunar habitats and proposes a method to assess the structural response of a lunar habitat made of sulfur concrete and regolith. The results suggest that shallow moonquakes with return periods greater than 475 years can result in the loss of global stability of the structure.
Article
Engineering, Aerospace
Xue-li Liu, Song-qi Hu, Yin Wang, Wei-meng Zhang, Lin-lin Liu
Summary: This study investigated the droplet entrainment mechanisms and liquid film behavior of HTPB/paraffin blended fuels in hybrid rocket motors. The experiments revealed that the entrained droplets were formed due to the disturbance of the gas-liquid interface, leading to a decrease in regression rate. The behavior of the liquid film was influenced by temperature, mass flux, chamber pressure, and HTPB concentration.
Article
Engineering, Aerospace
Dengke Li, Bo Sun, Chunliang Dai, Xiong Chen, Xiang Zhang, Yanjin Man
Summary: This study investigates the effects of non-equilibrium gas on shock/shock interactions (SSIs). The results show that chemical non-equilibrium effects significantly increase the impingement position of the shear layer, while thermal non-equilibrium effects slightly increase the standoff distance of the bow shock.
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.
Article
Engineering, Aerospace
P. V. Kozlov, N. G. Bykova, G. Ya Gerasimov, V. Yu Levashov, M. A. Kotov, I. E. Zabelinsky
Summary: This work is an experimental study on the radiative heat fluxes during the entry of a spacecraft into the Earth's atmosphere. It measures the radiation properties of high-temperature air and presents a new spectral model.
Article
Engineering, Aerospace
Christian Drobny, Katja Waetzig, Axel Rost, Martin Tajmar
Summary: A heaterless plasma cathode using disc shaped C12A7 electride as emitter material has been developed. The cathode has a low work function and optimized thermionic emission properties, making it easily ignitable from room temperature. After long-term operation, a detailed material analysis has been conducted.
Article
Engineering, Aerospace
Bing Yan, Jin Zhang, Ya-zhong Luo, Yue-he Zhu
JOURNAL OF GUIDANCE CONTROL AND DYNAMICS
(2023)
Article
Engineering, Aerospace
Vladimir Shin, Mirzobek Malikov, Yoonsoo Kim
Summary: This paper presents a path planning approach for smooth entry of an aerospace vehicle into a 3D elliptic orbit. The approach utilizes polynomial Bezier curves to connect the given position of the vehicle with the orbit entry point and minimizes the maximum curvature to optimize the smoothness measure.
INTERNATIONAL JOURNAL OF AERONAUTICAL AND SPACE SCIENCES
(2023)
Article
Engineering, Aerospace
Min Kyu Shin, Jeong Hwa Oh, Jeong Yeol Cha, Young Sung Ko, I. Sang Yu
Summary: This study addresses environmental and economic concerns in performance testing of heat exchangers by using ethanol and nitrogen as low-cost and eco-friendly alternatives to kerosene and helium.
INTERNATIONAL JOURNAL OF AERONAUTICAL AND SPACE SCIENCES
(2023)
Review
Engineering, Aerospace
Jonathan P. Roll
Summary: The relationship between the United States and China in the space domain is complex and significant. A historical overview helps us understand the context of their current actions. The five periods of interface between the two countries illustrate the evolving nature of their space relationship.
NEW SPACE-THE JOURNAL OF SPACE ENTREPRENEURSHIP AND INNOVATION
(2023)
Article
Engineering, Aerospace
Hyeong-Geun Kim, Jongho Shin
Summary: This study presents an optimal guidance structure for the salvo attack of multiple missiles, achieving impact angle and time constraints. By configuring the guidance command based on an optimization formulation, the desired profile of the look angle can be achieved while minimizing the usage of normal acceleration. The resulting trajectory is expressed as a polynomial form, allowing for various curvatures of impact courses. Additionally, the proposed guidance law can achieve a wide range of terminal constraints without the need for time estimation.
PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART G-JOURNAL OF AEROSPACE ENGINEERING
(2023)
Article
Engineering, Aerospace
Hamdi Ercan, Cuneyt Ozturk, Mustafa Akin
Summary: This paper assesses the impact of electrifying the environmental control system (ECS) and ice protection system (IPS) on aircraft weight, range, and fuel consumption. The simulation results show that the aircraft with electrical ECS and IPS architecture is lighter, has an extended range, and consumes less fuel. The findings suggest that the electrification of the conventional pneumatic system in aircraft has positive contributions in terms of weight, power consumption, and fuel consumption.
AIRCRAFT ENGINEERING AND AEROSPACE TECHNOLOGY
(2023)
Article
Engineering, Aerospace
G. Langer, Y. Bartling, T. Schmiel
Summary: This paper presents the initial results of the two-unit nanosatellite SOMP2b in orbit, focusing on the satellite bus and its scientific payloads. The commissioning of the satellite bus was mostly successful, despite limitations in communication and attitude functions. While TEGonSOMP and FIPEXnano payloads were successfully commissioned, the CiREX2 payload experienced a failure.
CEAS SPACE JOURNAL
(2023)
Article
Engineering, Aerospace
Conor Benson, Marcus Holzinger
Summary: This article introduces the potential applications of event cameras in the field of space domain awareness, including orbit determination and light curve analysis. By developing numerical and analytical event camera models, the understanding of event data is improved, and the potential uses on non-resolved objects are demonstrated.
JOURNAL OF THE ASTRONAUTICAL SCIENCES
(2023)
Article
Engineering, Aerospace
Hongwei Yang, Limin Qin, Shuang Li, Junpo Niu, Haiyang Li
Summary: This study aims to generate new families of periodic orbits for the Jupiter-Callisto system and provide numerical methods for their computation and continuation. A total of 108 periodic orbit families were located, of which 59 were continued to the entire families and 20 were asymmetrical. New discoveries and characteristics of particular families were discussed, and synodic resonant periodic orbits under the perturbation of Ganymede were identified.
JOURNAL OF SPACECRAFT AND ROCKETS
(2023)
Article
Engineering, Aerospace
Jiang Shao, Qingrui Zhou, Yan Xiao, Franco Bernelli-Zazzera, Zhaowei Sun
Summary: This work proposes a saturation control scheme for underactuated spacecraft formation reconfiguration in elliptic orbits without radial or along-track thrust. The control scheme is developed by linearizing the linear time-varying dynamics to linear time-invariant ones and analyzing the controllability and feasibility of formation reconfiguration using the rank criterion method. The developed underactuated saturation controller ensures that the system trajectory asymptotically converges to the specified configuration, and the Lyapunov-based analysis provides constraints on the controller parameters and stable reconfiguration accuracy of the system states. Numerical simulations are performed to verify the validity of the proposed underactuated control scheme in the presence of J2 perturbation.
PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART G-JOURNAL OF AEROSPACE ENGINEERING
(2023)
Article
Engineering, Aerospace
Zikang Su, Mou Chen, Jia Chen, Honglun Wang
Summary: This paper proposes a performance event-triggered control algorithm based on disturbance observer to stabilize the flexibly towed aerial recovery drogue subject to unknown airflows, cable towing tensions, limited computation capacity, and actuating power resources. The method accurately estimates disturbances and reduces computational costs while ensuring specified transient performance. The simulation results demonstrate the effectiveness of the proposed method.
PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART G-JOURNAL OF AEROSPACE ENGINEERING
(2023)
