<title>Abstract</title> On-orbit assembly alters the configuration and flexibility of spacecraft, significantly affecting system's dynamic characteristics. This paper develops a structure-attitude coupled model for reconfigurable multi-flexible-body spacecraft. A graph theory-based algorithm is proposed to update model’s parameters during assembly, including mass, stiffness, inertia matrices. To validate effectiveness method, simulation was established on-orbit task Modular Multi-Rotary...

Electrodynamic tether (EDT) is a key prospective technique for space-debris removal without the use of propellant. However, there are 2 main shortcomings classical EDT system. One that conductive with single wire should exceed several kilometers to produce expected force, which increases risk collision and damage. The other heavy current or high voltage caused by overlong tether, may even melt itself. Therefore, novel electrodynamic multi-tether (EMT) system has been proposed here overcome...

With the escalating frequency of space activities, particularly launch constellation satellites, amount debris experienced gradually increases, posing threats to safety and sustainability environment. To counteract growth debris, active deorbit devices are imperative for spacecrafts. In low Earth orbit (LEO), drag sail device has emerged as a highly effective solution due its ability increase spacecraft’s windward area, facilitating rapid by leveraging atmospheric primary perturbation. this...

Deorbit disposal of constellation satellites at the end their operational lifetime is considered a necessary task to maintain safety and sustainability low Earth orbit (LEO). In LEO region, especially below 800 km, drag sail device emerges as one most promising techniques accelerate deorbit process by advantages atmospheric drag. this paper, an attitude-orbit coupled dynamics model established for equipped with pyramid devices. The number length support booms, flare angle, initial orbital...

In order to reduce the population of space debris in geosynchronous orbit, a tethered-Coulomb formation (TCF) is proposed that consists tug and cluster charged connected by elastic massless tethers. The introduces repulsive coulomb forces avoid collisions among pieces debris. this way, system able maintain stable configuration when proper parameters are given. To determine relationship, dynamics model was derived using Lagrange's equation. Then, precise approximate equilibrium solutions item...

Increasingly frequent launch activities, as well the development of mega constellations, would cause a drastic increase in number space objects, which will then alter evolution outer space. To reveal this long-term change, an accurate space-environment model is required. There are two main approaches to building model, one track state objects individually, use significant computing resources; other take macroscopic variables, such spatial density, variable depict group debris, requires less...

In the field of active deorbiting technologies, electrodynamic tether has garnered attention due to its cost-effectiveness, light weight, and low fuel consumption. this study, address success rate deployment mechanisms used in previous in-orbit experiments, a novel mechanism with size 2 U weight 2.3 kg based on pusher motors is proposed. order achieve smooth without rupture rebound, an optimization method was proposed for springs, within mechanism. Finally, simulation ground ejection...

Learning video representation with convolution network methods has been proven useful to learn across many understanding tasks, including classification, action recognition and object detection. However, traditional fail take the text feature of into consideration, which may contain large amount information for final representation. Besides, current short often contains a lot human language from start end. In this paper, we propose novel neural system that learns by aggregating both features...

<title>Abstract</title> The libration motion of conductive tether in electrodynamic system had been demonstrated unstable inherently. This paper conducts a further dynamic analysis the instability system, specifically investigating existence periodic solution and equilibrium point, as well exploring condition for rapid motion. dumbbell model is employed to depict in-plane out-plane motion, parameter ε introduced incorporate influences current inclination. critical ranges angle that determine...