Abstract
In a previous paper 1 the steady load performance characteristics and oil film dynamic coefficients of a misaligned sterntube bearing were investigated. This paper reports further development in which the interaction of a sterntube bearing with the propeller shafting was considered in terms of the shaft's lateral vibration. Vibration amplitudes predicted with linear and non-linear after sterntube bearing oil films models did not differ significantly. In the case of the example used, the results indicated the effective damping to be in excess of critical. The predicted lateral vibration amplitude distribution along the shafting, with the after sterntube bearing length reduced to 54% of the original, showed the effectiveness of oil film angular stiffness and damping. A comparison with measured lateral vibrations by Hyakutake et al 2 gave good qualitative agreement with computed results, but a discrepancy in amplitude indicated substantial elastic deformation of the after sterntube bearing.
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