The key objective for this research was to construct an experimental test rig along with a finite
element model. Both had to accommodate a certain extent of misalignment and unbalance to
provide induced vibrations in the system. Misalignment and unbalance was then varied in
magnitude to identify the effect it has on the system. The next variable was the rotor speed
and its effects. Finally the experimental and theoretical results were compared and the slight
differences have been outlined and described.
A rotor supported by two bearings with a disk attached to the middle and a three jaw coupling
at the one end was considered for this research. The three jaw coupling consists out of two
hub elements with concave jaws and a rubber element that fits in-between the jaws. The
rotor-bearing system was subjected to unbalance at the disk and both angular and parallel
misalignment at the coupling. Misalignment was achieved by offsetting the centre of rotation
of the rotor and the motor shaft. Finite element analysis, along with Lagrange method, was
used to model the behaviour of the system. A mathematical model for the three jaw coupling
was derived to simulate its behaviour. The second order Lagrange model was reduced to a first
order and solved using the Runge-Kutta method. Experimental results were obtained from a
test rig and used to validate the theoretical results. Time domain and frequency spectrum
were used to display the results. / Thesis (M.Sc.Eng.)-University of KwaZulu-Natal, Durban, 2011.
| Identifer | oai:union.ndltd.org:netd.ac.za/oai:union.ndltd.org:ukzn/oai:http://researchspace.ukzn.ac.za:10413/8957 |
| Date | 22 May 2013 |
| Creators | Grobler, Herbert Alfred. |
| Contributors | Bright, Glen., Loubser, Richard. |
| Source Sets | South African National ETD Portal |
| Language | en_ZA |
| Detected Language | English |
| Type | Thesis |
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