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In railway vehicles, air springs are used for isolating vibrations and improving comfort for the passengers. For the prediction of the vibrations in the car body, a valid model of the air spring is needed. A new model for simulation of the
Strong winds produced in storms and hurricanes have a destructive effect on buildings, particulary on low-rise structures such as industrial complexes. The damage often starts when the roof is teared off because of strong suction pressures which are produced near corners and
This master thesis reports of two methods, both using Langevin dynamics to simulate the motion of a charged particle in a two-dimensional infinite sized randomly distributed magnetic field. One of the methods uses periodic boundary conditions to mimic the infinite field, while
The increasing need of airborne surveillance for meteorological, environmental and military reconnaissance over remote areas and in harsh conditions has led to the development of a small robotic aircraft, the Aerosonde. Now ongoing research is focused on improving the operational capacity including
A study of the stability characteristics of streamwise streaky structures in parallel boundary layer flow above a porous surface is conducted. The analytical solution for the perturbed velocities is sought by applying Fourier transformation in the spanwise direction and Laplace transformation in
A single-feed circularly polarized microstrip antenna array, operating at 2.45 GHz, have been analyzed and designed. The antenna is mainly intended to be used for reception of a video signal transmitted from an unmanned aircraft, but can be used for other applications
Fibres become curled during high consistency treatments in the pulp mill. This changes the properties of paper, for instance it is belived that the shrinkage during drying is increased. The drying shrinkage is an important factor to control, one reason is that
Even on a grey day with an overcast sky there is normally an excess of light outdoors in comparison with what is required at most work places indoors. This excess of light can be harvested, concentrated and distributed indoors by fiber optics
The use of Non-Crimp Fabrics (NCFs) as reinforcement in composites is relatively new, but the use of this type of materials is expected to increase a lot in the coming years. NCF-based composites can for example replace the very costly use of
A study of the flow of the solar wind past the terrestrial magnetosphere is done, using a simplified model in two dimensions describing a planar magnetopause. The theoretical analysis is made through ordinary perturbation technique, using Navier-Stokes and MHD equations. Process of