Sökning: "AFT"

Visar resultat 1 - 5 av 31 uppsatser innehållade ordet AFT.

  1. 1. Preliminary Design of a 30 kN Methane-Oxygen-powered Electric-Pump-fed Liquid Rocket Propulsion System

    Master-uppsats, Luleå tekniska universitet/Rymdteknik

    Författare :Vikramjeet Das; [2023]
    Nyckelord :rocket engine; liquid rocket; methalox; electropump; LRPS; LPRE; liquid methane; electric pump feed system;

    Sammanfattning : The design of a liquid rocket propulsion system, unlike that of a standalone system, is intertwined with the overall development of a number of associated systems and is influenced by a multitude of conditions and considerations: from the requirements needed to accomplish the mission to the rationalizations involved behind the development of each rocket system and/or component. In my thesis, the preliminary design of a “new generation” 30 kN rocket engine driven by an electric pump feed system and running on liquid methane and liquid oxygen is performed. LÄS MER

  3. 2. Wind Turbine Recovery Forecasting using Survival Analysis

    Master-uppsats, Lunds universitet/Matematisk statistik

    Författare :Anton Palets; [2023]
    Nyckelord :Survival analysis; Recovery Forecast; Wind Turbine; Availability Forecast; AFT model; Aalen s model; Cox regression; Cox Proportional Hazards; Variation Processes; Mathematics and Statistics;

    Sammanfattning : The goal of this thesis is to present a methodology for predicting time until recovery of failed wind turbines. The necessity is motivated by the potential for more accurate wind energy export forecasts. The current approach rests entirely on having an expert examine the turbine and produce a time estimate. LÄS MER

  4. 3. Is there a benefit of super spikes in long jump performance?

    Master-uppsats, Gymnastik- och idrottshögskolan, GIH/Institutionen för fysisk aktivitet och hälsa

    Författare :Erik Svensson; [2023]
    Nyckelord :Long jump; long jump performance; AFT; super shoes; super spikes; carbon fiber plate; athletics; track field; jump; biomechanics; sprint; speed; force;

    Sammanfattning : Background and aim The pace of development of distance running shoes has been fast-forward since 2016 when Nike introduced their model Nike Zoom Vaporfly, with an imbedded carbon fiber plate and an advanced newly developed Pebax®-foam. The shoe-development has continued to track events, with the introduction of carbon fiber plate in several shoe-models for running and sprint- events. LÄS MER

  5. 4. Range impact of a high velocity aft-propeller on a subsonic aerodynamic body

    Master-uppsats, Luleå tekniska universitet/Rymdteknik

    Författare :Jens Teodor Mattsson; [2023]
    Nyckelord :propeller; transsonic; fluid dynamics; cfd;

    Sammanfattning : This master’s thesis is aimed to examine the possible range increase of a ballistically fying body equipped with a propeller working at transonic velocities. To determine whetherthe propeller will provide an improvement in range, results from simulations are compared to corresponding cases of similar bodies fying without a propeller. LÄS MER

  7. 5. Evaluation of static driving posture predictions for trucks

    Kandidat-uppsats, Högskolan i Skövde/Institutionen för ingenjörsvetenskap

    Författare :Juan Salguero Salguero; Marta de Sola Ruiz; [2023]
    Nyckelord :;

    Sammanfattning : The project aims to validate and assess different methods for predicting driving posture in trucks using a physical truck cabin as well as a digital version of the truck cabin in the form of CAD geometries. Two prediction methods, statistical and IPS IMMA simulation, were employed. LÄS MER