Essays about: "beräkningsteknik"

Showing result 1 - 5 of 10 essays containing the word beräkningsteknik.

1. 1. Thermal Initiation of Energetic Materials Caused by Hot Fragments

   University essay from KTH/Matematik (Avd.)

   Author : Sirak Ghebreamlak; [2022]
   Keywords : Applied mathematics; computational mathematics; heat equation; thermal initiation; chemical kinetics; energetic materials; Tillämpad matematik; beräkningsteknik; värmeledningsekvationen; termisk initiering; kinetik; energetiska material;

   Abstract : The cause of unintentional initiations of energetic materials is an important area of study due to the risks that comes with storing energetic materials such as high explosives. The current models used to simulate the process of heating energetic materials by a hot metal fragment do not give reliable predictions. READ MORE

3. 2. An Arbitrary Lagrangian-Eulerian Finite Element Method for Shock Wave Propagation: Validating Simulations of Underwater Explosions

   University essay from KTH/Numerisk analys, NA

   Author : Sebastian Sandström; [2021]
   Keywords : finite element; applied mathematics; computational mathematics; hydrocode; arbitrary lagrangian-eulerian; LS-DYNA; tillämpad matematik; beräkningsteknik; finita elementmetoden; hydrokod; arbitrary lagrangian-eulerian; LS-DYNA;

   Abstract : Underwater explosions are often modeled with Arbitrary Lagrangian-Eulerian (ALE) Finite Element Methods. The objective of this thesis is to validate the simulation method, with respect to the propagating shock wave. A two-dimensional axisymmetric model of a spherical TNT charge submerged in water is simulated using LS-DYNA. READ MORE

4. 3. Evaluation of Peridynamics and Its Application in Harmonic-Structured Material Simulations

   University essay from Lunds universitet/Mekanik

   Author : Theodor de Sousa; [2020]
   Keywords : peridynamics; peridigm; harmonic-structured materials; computational mechanics; fracture modelling; Technology and Engineering;

   Abstract : Materials are constantly sought to be improved in different manners. Two of the most common characteristics to improve are strength, and ductility. Historically, materials are modified homogeneously to achieve improvement, while the past century has also seen composite materials becoming standard-issue within various industries. READ MORE

5. 4. Evaluation, adaption and implementations of Perfectly Matched Layers in COMSOL Multiphysics

   University essay from KTH/Numerisk analys, NA

   Author : Simon Erlandsson; [2020]
   Keywords : Applied mathematics; computational mathematics; finite element method; FEM; perfectly matched layer; PML; COMSOL; Tillämpad matematik; beräkningsteknik; finita elementmetoden; FEM; PML; COMSOL;

   Abstract : Perfectly matched layer (PML) is a commonly used method of absorbing waves at a computational boundary for partial differential equation (PDE) problems. In this thesis, methods for improving the usability of implementations in Comsol Multiphysics is addressed. READ MORE

6. 5. Grey-box modelling of distributed parameter systems

   University essay from KTH/Beräkningsvetenskap och beräkningsteknik (CST)

   Author : Patrik Barkman; [2018]
   Keywords : grey-box; distributed parameter system; partial differential equations; chemical reactions; finite element method; FEM; machine learning; neural networks; hybridmodell; distribuerade parametersystem; partiella differentialekvationer; kemiska reaktioner; finita elementmetoden; FEM; maskininlärning; neuronnätverk;

   Abstract : Grey-box models are constructed by combining model components that are derived from first principles with components that are identified empirically from data. In this thesis a grey-box modelling method for describing distributed parameter systems is presented. READ MORE