Sökning: "Spacecraft"

Visar resultat 26 - 30 av 199 uppsatser innehållade ordet Spacecraft.

  1. 26. Motion of icy grains originating in Saturn’s D-ring

    L3-uppsats, Uppsala universitet/Institutet för rymdfysik, Uppsalaavdelningen; Uppsala universitet/Institutionen för fysik och astronomi

    Författare :Apostolos Kolokotronis; [2023]
    Nyckelord :;

    Sammanfattning : Saturn's rings have long been thought to provide the planetary atmosphere with infalling material, affecting both its chemical composition and physical properties (e.g. temperature). LÄS MER

  3. 27. Trajectory Optimisation of a Spacecraft Swarm Maximising Gravitational Signal

    Master-uppsats, KTH/Optimeringslära och systemteori

    Författare :Rasmus Maråk; [2023]
    Nyckelord :Spacecraft Swarms; Trajectory Optimisation; Impulsive Manoeuvres; Evolutionary Algorithms; Polyhedral Gravity Model; Small Body Exploration; Discrete Spherical Grids; Svärmande rymdfarkoster; Banoptimering; Impulsiva manövrar; Evolutionära Algoritmer; Polyhedral gravitationsmodell; Utforksning av små kroppar i solsystemet; Diskreta sfäriska rutnät;

    Sammanfattning : Proper modelling of the gravitational fields of irregularly shaped asteroids and comets is an essential yet challenging part of any spacecraft visit and flyby to these bodies. Accurate density representations provide crucial information for proximity missions, which rely heavily on it to design safe and efficient trajectories. LÄS MER

  4. 28. Investigation of a Novel Atmosphere-Breathing Electric Propulsion Platform and Intake

    Master-uppsats, KTH/Skolan för elektroteknik och datavetenskap (EECS)

    Författare :Kun Feng; [2023]
    Nyckelord :ABEP; VLEO; DSMC; FMF; Orbital Aerodynamics; ABEP; DSMC; VLEO; FMF; Orbital Aerodynamics;

    Sammanfattning : Very Low Earth Orbit (VLEO) provides many benefits for space missions, including better image resolution for Earth observation, better telecommunication link with ground stations, lower launch cost, lower risk of collisions, and fast end-of-life disposal. The last point in benefit is also the main challenge for placing satellites in VLEO. LÄS MER

  5. 29. Analysis and Design of a Microgravity Drop Tower

    Master-uppsats, Luleå tekniska universitet/Rymdteknik

    Författare :Tristan Edwards; [2023]
    Nyckelord :drop tower; microgravity;

    Sammanfattning : A drop tower is a device that produces a microgravity environment by allowing an experiment to free fall for a short period of time, usually less than 10 seconds. Certain types of drop towers are also capable of reproducing the gravitational conditions of other celestial bodies, such as Lunar and Martian gravity. LÄS MER

  7. 30. Application of Discrete Time High Order Control Barrier Functions for a prototype multi-spacecraft inspection of the ISS

    Master-uppsats, KTH/Skolan för elektroteknik och datavetenskap (EECS)

    Författare :Gregorio Marchesini; [2023]
    Nyckelord :Space Robotics; Control Barrier Functions; Autonomous systems; Multi-agent systems;

    Sammanfattning : In the past few years, the application of Control Barrier Functions (CBF) and High Order Control Barrier Functions (HOCBF) as a suitable framework to ensure safety for autonomous systems has attracted increasing interest. In particular, autonomous space systems are frequently subject to safety-critical constraints due to the high costs involved in manufacturing and launching. LÄS MER