Sökning: "Economical model"

Visar resultat 1 - 5 av 136 avhandlingar innehållade orden Economical model.

1. 1. Numerical and experimental modelling for wave energy arrays optimization

   Författare :Marianna Giassi; Malin Göteman; Jan Isberg; Gregorio Iglesias; Uppsala universitet; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Wave energy; Point absorber; Arrays; Parks; Farms; Optimization; Array layout; Genetic algorithm; Cost function; Wave tank experiment; Hydrodynamics; Economical model; Engineering Science with specialization in Science of Electricity; Teknisk fysik med inriktning mot elektricitetslära;

   Sammanfattning : Many wave power conversion devices, especially point-absorbers, do not provide alone the necessary amount of converted electricity to be cost effective, instead they are designed to be deployed in arrays of many units. Such arrays, or parks, can satisfy a large-scale energy demand, reduce the costs of the produced electricity and improve the reliability of the system. LÄS MER

3. 2. Optimization and Model Validation of Transonic Compressors

   Författare :Lars R Ellbrant; Chalmers tekniska högskola; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; compressor; optimization; design; metamodels; CFD; validation; multiobjective;

   Sammanfattning : Economical aspects such as reduced specific fuel consumptions and ever growing environmental requirements on emissions and percieved noise levels, are the major drivers in the search for improvement of aircraft engines. For turbofan engines, the global trend is towards higher efficiency which is accomplished by increasing component efficiencies, the bypass ratio and overall pressure ratio while keeping the engine weight low. LÄS MER

4. 3. A Novel Submarine Design Method - Based on technical, economical and operational factors of influence

   Författare :Mats Nordin; Chalmers tekniska högskola; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; parametric and concept; submarine system design; synthesised design model;

   Sammanfattning : The thesis work, with the openly published journal and conference papers, is motivated by theambition to interact over time with the scientific community in the development of a novelcoherent submarine design method to regain momentum in Swedish submarine computeraided Simulation Based Design (SBD). The work was initially stimulated by an earlyobservation in our submarine engineering community, that the existing knowledge of navalarchitecture and systems theory including cost prediction and operational analysis was notcoherently utilised for the design of Naval Integrated Complex System (NICS), hence theneed for a coherent approach. LÄS MER

5. 4. Simulation of Economical Performance of Isolated Rural Mini-Grids

   Författare :Al-Mas Sendegeya; Lennart Söder; Eriabu Lugujjo; Mikael Amelin; Alex Kyaruzi; KTH; []
   Nyckelord :Price sensitivity; system operators; Monte Carlo simulation;

   Sammanfattning : Prior knowledge about the possible characteristics of demand and supply is vital in the planning and operation of economically sustainable isolated rural power systems. System modelling and simulation is one of the tools that can be used in planning and assessing the performance of these systems. LÄS MER

7. 5. Improved Bridge Evaluation

   Författare :Hendrik Schlune; Chalmers tekniska högskola; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; model updating; structural identification; Bridge evaluation; concrete structures; finite element analysis; finite element method; load cases;

   Sammanfattning : Accurate structural models are required for optimal management of existing bridges and economical new ones. However, unavoidable modelling uncertainties and difficulty in modelling the non-linear response of concrete bridges can lead to structural models which do not fulfil this requirement. LÄS MER