Sökning: "flexible spacecraft"

Visar resultat 1 - 5 av 8 uppsatser innehållade orden flexible spacecraft.

  1. 1. Resonance Mitigation in the Attitude Control of a Flexible Large Solar Sail

    Master-uppsats, KTH/Lättkonstruktioner, marina system, flyg- och rymdteknik, rörelsemekanik

    Författare :Jonas Linnros; [2023]
    Nyckelord :Resonance; Control theory; Mechanics; Solar sail; PID; Space; Resonans; Reglerteknik; Mekanik; Solsegel; PID; Rymd;

    Sammanfattning : This project is about the design process of a resonancemitigating algorithm for a large solar sail. The solar sail isa structure made up by four long booms in a cross patternwith suspended sails between the edges of the booms. Thespacecraft in this report is controlled using smaller rotatingsails at each tip of the booms. LÄS MER

  3. 2. Validation of the attitude control of KNATTE with flexible appendages

    Master-uppsats, Luleå tekniska universitet/Institutionen för system- och rymdteknik

    Författare :Christoffer Johansson; [2022]
    Nyckelord :KNATTE; flexible appendages; control; SMC; LQG; PWM; PWPF;

    Sammanfattning : The effect of flexible panels on a spacecraft during attitude movement may induce problems if not correctly accounted for in the control system for the spacecraft. The aim of this thesis is to find and evaluate, control algorithms that could be suitable for the Kinesthetic Node and Autonomous Table-Top Emulator (KNATTE) with two flexible mock-up solar panels during an attitude movement of 20 degrees. LÄS MER

  4. 3. Modelling and testing of a solar panel structure for KNATTE (Kinesthetic Node and Autonomous Table-Top Emulator)

    Master-uppsats, Luleå tekniska universitet/Institutionen för system- och rymdteknik

    Författare :Elena Fernández Bravo; [2021]
    Nyckelord :Frictionless platform; Linear Quadratic Gaussian; Flexible appendages; Finite Element Method;

    Sammanfattning : One of the challenges that satellites face is the interaction between control movement and vibration of flexible appendages such as solar arrays and antennas that can negatively affect the performance of the spacecraft. The aim of this thesis is to develop a numerical model of a solar panel structure for KNATTE, a frictionless platform developed by the Onboard Space Systems group at Luleå University of Technology, and develop a control law that reduces the flexible vibration of the solar arrays when attitude control manoeuvres are performed. LÄS MER

  5. 4. Machine Learning for Space Applications on Embedded Systems

    Master-uppsats, Luleå tekniska universitet/Rymdteknik

    Författare :Ric Dengel; [2021]
    Nyckelord :Machine Learning; Space Application; Embedded System; Hardware Acceleration; FPGA;

    Sammanfattning : As space missions continue to increase in complexity, the operational capabilities and amount of gathered data demand ever more advanced systems. Currently, mission capabilities are often constrained by the link bandwidth as well as onboard processing capabilities. LÄS MER

  7. 5. Robust attitude control of a spacecraft with flexible dynamics

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

    Författare :Francesco Giuliano; [2019]
    Nyckelord :;

    Sammanfattning : The employment of Electrical Propulsion, to reduce the cost of satellites, has also increasedthe use of large solar arrays. Such solar panels are associated with low-frequency resonantmodes, and to ensure fine pointing of the satellite, the attitude control should not excitethese modes. LÄS MER