| dc.description.abstract | In the beginning the problematic of ice impacts on a ships drive train and the
similarity of this work to last year's thesis from Bjørn Eliassen Vik is mentioned.
After that the Bond-Graph-Methodology on which this thesis is based in shortly
explained. Then the modeling of the coupling is explained. Here the coupling
is divided into parts and modeled separately. A particular interest is on the
dynamic behavior of the springs. These parts are then joined together. In
the next chapter the coupling model is compared to the values given by the
manufacturer. It shows that the model is too stiff. Therefore the thickness of
the springs and the bulk-modulus of the oil is adjusted until it matches the
template.
The model is than tested by varying the excitation frequency, the resistance of
the load and the inertia of the coupling. It shows that the frequency has a great
influence on the stiffness of the system, the resistance a limited influence and
the inertia an influence on the nominal frequency of the system.
In the end the coupling is inserted into a drive train model. First it is simulated
in open water, than an additional ice load is placed upon the propeller. The
results are compared to simulations of the drive train with a simpler coupling
and without a coupling. The results show that both couplings have damping
capabilities. However, the ice load is too little to determine the effect of sudden
peak loads properly. | |
