Sökning: "roughness class"

Visar resultat 1 - 5 av 9 uppsatser innehållade orden roughness class.

1. 1. THE WIND OF CHANGE – SENSITIVITY OF THREE PARAMETERS ON WIND POWER ENERGY CALCULATIONS USING WINDPRO SOFTWARE

   Kandidat-uppsats, Uppsala universitet/Institutionen för geovetenskaper

   Författare :Nina Skuja; [2023]
   Nyckelord :Error; Sensitivity; WindPRO; Wind Power; Wind Speed; Roughness; Power Curve; Energy Production; Wind Resource Assessment;

   Sammanfattning : Many parameters used for Wind Resource Assessment (WRA) have uncertainty and variability, yet are input into the process as single values. The extent of the uncertainty or variance may not be known, and may or may not be significant enough to affect output. LÄS MER

3. 2. Machine Learning Applied to Reach Classification in a Northern Sweden Catchment

   Master-uppsats, Umeå universitet/Institutionen för ekologi, miljö och geovetenskap

   Författare :Mariana dos Santos Toledo Busarello; [2021]
   Nyckelord :machine learning; geomorphology; random forest; channel type;

   Sammanfattning : An accurate fine resolution classification of river systems positively impacts the process of assessment and monitoring of water courses, as stressed by the European Commission’s Water Framework Directive. Being able to attribute classes using remotely obtained data can be advantageous to perform extensive classification of reaches without the use of field work, with some methods also allowing to identify which features best described each of the process domains. LÄS MER

4. 3. Active and semi-active suspensions for articulated vehicles to minimise tyre wear

   Master-uppsats, KTH/Väg- och spårfordon samt konceptuell fordonsdesign

   Författare :Haoran Zhang; [2021]
   Nyckelord :Articulated vehicle; tyre wear; quarter car model; semi-active and active suspension; Ledat fordon; däckslitage; kvartsbilsmodell; semiaktiv och aktiv fjädring;

   Sammanfattning : Tyre wear is a vital problem in vehicles, especially in articulated vehicles because of their heavier axle loads. Tyre wear can not only do harm to vehicle dynamics but also cause tyre particle emissions. Therefore, solutions that can minimise tyre wear are where this thesis work focuses. LÄS MER

5. 4. WIND POWER PREDICTION MODEL BASED ON PUBLICLY AVAILABLE DATA: SENSITIVITY ANALYSIS ON ROUGHNESS AND PRODUCTION TREND

   Magister-uppsats, Uppsala universitet/Institutionen för geovetenskaper

   Författare :Gireesh Sakthi; [2019]
   Nyckelord :wind resource assessment; wind power prediction model; wind power project; MIUU; wind flow modelling; annual energy production; production trend; wind measurement; power curve; power law exponent; roughness class;

   Sammanfattning : The wind power prediction plays a vital role in a wind power project both during the planning and operational phase of a project. A time series based wind power prediction model is introduced and the simulations are run for different case studies. LÄS MER

7. 5. Experimental Study of Metallic Surfaces Exposed to Cavitation

   Master-uppsats, KTH/Materialvetenskap

   Författare :Marcio Freitas De Abreu; [2018]
   Nyckelord :cavitation; cylinder liner; lamellar gray cast iron; erosion pitting; graphite class; cavitation;

   Sammanfattning : Cylinder liners in heavy-duty truck engines are subjected to intense vibrations and may sustain damage from the cavitation of bubbles in the coolant liquid, with some risks of leakage and engine breakdown. An ultrasonic oscillating probe was used to simulate the pitting rates and behavior of samples extracted from cylinder liners, which are made of grey cast iron, with differences in surface roughness, glycol and inhibitor content in coolant, coolant temperature and graphite flake class; bainitic microstructures were also tested. LÄS MER