Sökning: "equations of motion"

Visar resultat 1 - 5 av 121 uppsatser innehållade orden equations of motion.

  1. 1. Gravitational Collapse of a Massless Scalar Field in a Theory of Minimally Modified Gravity

    Master-uppsats, KTH/Fysik

    Författare :Atabak Fathe Jalali; [2024]
    Nyckelord :Theoretical physics; astrophysics; modified gravity; minimally modified gravity; gravitational collapse; VCDM; scalar collapse; apparent horizon; numerical relativity; Teoretisk fysik; astrofysik; modifierad gravitation; minimalt modifierad gravitation; gravitationskollaps; VCDM; skalär kollaps; uppenbar horisont; numerisk relativitet;

    Sammanfattning : This thesis explores the spherically symmetric gravitational collapse of a massless scalar field in a minimally modified gravity theory denoted VCDM (V replaces $\Lambda$ in the $\Lambda$CDM abbreviation), a class of theories propagating the same degrees of freedom as general relativity at the expense of broken 4D diffeomorphism invariance. Numerical evolution of the equations of motion reveals that for small initial scalar profile amplitudes, no black hole forms from the collapse. LÄS MER

  3. 2. Design of the control system for a powered landing maneuver of a rocket

    Master-uppsats, Luleå tekniska universitet/Rymdteknik

    Författare :Davide Demartini; [2023]
    Nyckelord :;

    Sammanfattning : The powered soft landing of a spacecraft represents a maneuver with high interest, withsome private launcher companies – SpaceX, Blue Origin, Rocket Factory Augsburg, etc. - showinginterest in implementing it as a solution for their launchers, and several national agenciesusing it for the exploration of celestial bodies where it may be the only option. LÄS MER

  4. 3. Implementation of Flight Mechanical Evaluation Criteria in an Aircraft Conceptual Design Tool with focus on Longitudinal Motions

    Master-uppsats, Linköpings universitet/Fluida och mekatroniska system

    Författare :Argyro Giota; Aleksandra Roszkowska; [2023]
    Nyckelord :flight mechanics; Pacelab APD 8.1; aerodynamic derivatives; equations of motion; B747; stability and control; longitudinal dynamics; phugoid mode; short period mode; DATCOM ; OpenVSP;

    Sammanfattning : This report focuses on the utilisation of flight mechanics in the context of aircraftconceptual design to assess stability, control, and motion characteristics. The pri-mary objective is to acquire the equations of motion and implement longitudinalstability and control criteria using Pacelab Aircraft Preliminary Design 8. LÄS MER

  5. 4. Dynamic Consequences of Bearing Radial Clearance in Jeffcott Rotors

    Kandidat-uppsats, Umeå universitet/Institutionen för matematik och matematisk statistik

    Författare :Marcus Bohman; [2023]
    Nyckelord :;

    Sammanfattning : Earlier research on bearing radial clearance on a vertical Jeffcott rotor is rare, but an interesting and realistic point of view in a rotor system. Applying this force to the system produces interesting results for a vertical Jeffcott rotor. LÄS MER

  7. 5. Axisymmetric capillary water waves on cylindrical fluid jets

    Master-uppsats, Lunds universitet/Matematik (naturvetenskapliga fakulteten); Lunds universitet/Matematikcentrum

    Författare :Anna-Mariya Otsetova; [2023]
    Nyckelord :Euler equations; Bernoulli boundary condition; Schauder estimates; nonlinear functional analysis; Mathematics and Statistics;

    Sammanfattning : In their paper, Vanden-Broeck, Miloh and Spivack (Wave Motion 27, 1998) describe two limiting behaviours of irrotational, axisymmetric capillary water waves using numerical methods. They found a two-parameter family of nontrivial solutions. Some solutions of small amplitude approach a uniform stream, while others approach a static configuration. LÄS MER