Sökning: "surrogate modelling"

Visar resultat 1 - 5 av 21 avhandlingar innehållade orden surrogate modelling.

  1. 1. Numerical Modelling of Fuel Injection and Stratified Turbulent Combustion in a Direct-Injection Spark-Ignition Engine Using an Open Source Code

    Författare :Chen Huang; Chalmers University of Technology; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; hollow-cone spray; KHRT; liquid penetration; CFD; OpenFOAM; Flame Speed Closure FSC ; ignition delay; SMD; gasoline surrogate; laminar flame speed; presumed PDF; Spray-Guided Gasoline Direct Injection engine; chemical mechanism; modelling; premixed stratified turbulent combustion;

    Sammanfattning : Stringent regulations on the emission of pollutants, especially carbon dioxide (CO2), necessitate the development of advanced combustion technologies. Gasoline direct injection (GDI) into the combustion chamber of a Spark Ignition (SI) engine is a combustion strategy that is widely recognized as having the potential to improve fuel efficiency of internal combustion engines for passenger cars. LÄS MER

  2. 2. Predictive Modelling to Support Design and Manufacturing in Aerospace Engineering

    Författare :Siva Krishna Dasari; Abbas Cheddad; Lars Lundberg; Stan Matwin; Blekinge Tekniska Högskola; []
    Nyckelord :NATURAL SCIENCES; NATURVETENSKAP; NATURVETENSKAP; NATURAL SCIENCES; surrogate modelling; defects classification; machine learning; aerospace; additive manufacturing; Computer Science; Datavetenskap;

    Sammanfattning : A crucial issue in the design of aircraft components is the evaluation of a large number of potential design alternatives.  This evaluation involves too expensive procedures, consequently, it slows down the search for optimal design samples. LÄS MER

  3. 3. DEM Modelling and Simulation of Cone Crushers and High Pressure Grinding Rolls

    Författare :Johannes Quist; Chalmers University of Technology; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Discrete Element Method; Modelling; HPGR; Comminution; DEM; Simulation; Crushing; Minerals Processing; Cone Crusher;

    Sammanfattning : The comminution of rock and ore materials consumes ~1.5-1.8 % of the total energy production in mining intensive countries (Tromans, 2008). Several research findings show that there are ways of utilizing compressive breakage modes that are more energy efficient compared to conventional grinding circuits based on large inefficient tumbling mills. LÄS MER

  4. 4. Mathematical modelling for optimization of truck tyres selection

    Författare :Zuzana Sabartova; Göteborgs universitet; Göteborgs universitet; Gothenburg University; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; simulation-based optimization; truck tyres selection; surrogate model; radial basis function interpolation; rolling resistance coefficient; combinatorial set of problem instances; global optimization; global optimization;

    Sammanfattning : This thesis, which consists of an introduction and three appended papers, concerns the optimal selection of tyres for a given vehicle configuration and an operating environment in which the vehicle is to be used. The optimization problem stems from an industrial project performed in cooperation between Chalmers University of Technology and Volvo Group Trucks Technology (GTT). LÄS MER

  5. 5. Identification and synthesis of components for uncertainty propagation

    Författare :Mladen Gibanica; Chalmers University of Technology; []
    Nyckelord :NATURVETENSKAP; TEKNIK OCH TEKNOLOGIER; TEKNIK OCH TEKNOLOGIER; NATURAL SCIENCES; ENGINEERING AND TECHNOLOGY; ENGINEERING AND TECHNOLOGY; substructuring; system identification; interface reduction; uncertainty quantification; experimental methods; uncertainty propagation; Monte Carlo method; state-space models; surrogate modelling;

    Sammanfattning : For automotive structures, built-up of hundreds of components with property spread, knowing the effects of component variability and its propagation through the system assembly is important in order to mitigate noise and vibration problems. To increase the understanding of how the spread propagates into variability in built-up structures, both experimental and computational aspects are considered in this thesis. LÄS MER