Multiphysics Modelling of Spring-Supported Thrust Bearings for Hydropower Applications

The present work is an attempt in predicting the performance of spring-supported thrust bearings. Thorough research has been done into the existing theories in order to incorporate them into a commercial multiphysics simulation software; COMSOL Multiphysics. The results proved the capability of coupling partial differential equations (PDE) to form a complex non linear system and thus obtaining proper results. The Reynolds equation is solved taking into account pad and collar elastic deformation and thermal expansion. The importance of including these phenomena has been evaluated. Linking the bearing material properties with the pressure and temperature developed in the assembly has been seen to play an important role.The result of this thesis is a hydrodynamic model taking into account all the main variables involved in a spring-supported thrust bearing behaviour. The model developed could be a useful tool when designing a thrust bearing.Validerat; 20120621 (anonymous