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This master dissertation describes the process of implementing a coupling between the boundary element method (BEM) and the finite element method (FEM) for three dimensional time harmonic structure-acoustic models in CALFEM, which is a finite element toolbox to MATLAB. Since no boundary elements earlier have been represented in CALFEM the development and implementation of constant and linear boundar
This master’s thesis relates to the design of prefabricated balconies. Such balconies are often designed in different ways. A separate investigation of what is technically possible regarding, among other things, supports and balcony sizes must often be performed in every project involving balconies. Three kinds of solutions are presented. These are tie rod, cantilever and column supported balconie
Within the automotive industry today, companies save significant amounts of money through computer simulations. Mathematics through numerical methods becomes important when as in this case the investigation is done with the Finite Element Method (FEM). A self-pierced rivet (SPR) joint specimen in a T-peel case is studied. The specimen consists of 1.15 mm thick steel sheets with a rivet of 5 mm in
A geometry model for three dimensional fibre networks is proposed. The geometry model is intended to be a part of a system, where data from a computer tomography of a fibre material can be fitted to the geometry model and from there, be evaluated according to key parameters such as fibre length, fibre orientation angles and radii of curvature. The model is also intended to give the geometry foundation
In this master thesis a two-dimensional finite element model describing nonlinear moisture dynamics in paper materials is developed. The aim of the model is to simulate moisture movement in corrugated board boxes due to fluctuating relative humidity. To evaluate the accuracy of the model a simulation is carried out which is being compared to measurements. For the paper material used in the simulati
When birds move around in their natural environment the feathers on the wings are exposed to various factors that reduce their performance, such as UV-radiation, mechanical wearing and bacteria. In time the feathers get worn out and are replaced. This usually happens once a year by a process called moult. Some bird species differs from this pattern and moult twice a year. This behavior may have infl
Detta arbete baserar sig på testresultat från provningarna av två olika turbinrotorer. I båda fall rör det sig om rotorer med integrerade blad, så kallade bliskar. Den ena rotorn – Vinci – utgör en del av bränslepumpen i motorn till ett planerat övre steg i Arianeraketen. Den andra rotorn – Vulcain – sitter på motsvarande sätt i raketens huvudmotor. Då det gäller Vinciblisken var målsättningen huv
The purpose of this Master’s thesis is to establish a methodology for hydrobushing modelling and parameter identification. The studied hydrobushing is used as a connector element between suspension components in Volvo S60, S80, V70, and XC70. The hydrobushing has coupled amplitude and frequency dependence. At Volvo Cars there is a need for a component model, which fully captures this property. Exp
The tear opening study is conducted with an example from the Tetra Pak package industry, the Tetra Top package. The top of the package is constructed by a injection molded low density thermoplastic. The package is opened with a tear opening located on the top part. In order to make tear opening more versatile, studies how opening forces reacts upon material modifications and alternative geometry h
Beverage packages made of paper and plastic materials that are stored for a long time, deform due to creep deformations. The phenomena is termed bulging and means that the package changes its shape. Bulging is a major issue for the producers of beverage packages. The purpose of this master’s dissertation, is to develop a Finite Element-model for simulation of bulging of beverage packages at varyi
The course Software Development for Technical Systems at the division of Structural Mechanics teaches students techniques for implementing finite element applications with both user interface and computational code. Currently Borland Delphi environment is used for the user interface and Fortran is used for the computational part. This master’s thesis is an effort to study methods of integrating Fort
