Because of propeller hydrodynamic influence, the shafting vibration is a coupled vibration which
includes torsional, longitudinal and whirling vibrations. It is unsuitable to analyze different vibrations of propulsive
shafting systems with development of shipbuilding technologies. To overcome the shortages of traditional marine
standards, we establish a new numerical model of the shafting coupled vibration. And we put forward shafting
coupled vibration calculation to ensure better reliability of main propulsion system. The shafting system is modeled
into two sub-systems, a continuous one and a discrete one. Wave approach and transit matrix method are used to
investigate displacement and stress fields in continuous and discrete sub-systems, respectively. And vibrations of
different modes in both sub-systems are coupled by using dynamic equilibrium and continuity condition to deduce
the global equations governing the motion of shafting. The coupling calculation is then used to research the reason
of a very large crude carrier (VLCC) stern hull vibration. It is shown by the comparison of the results from both
coupling and dependent vibration calculations that vibration in deferent directions will cause deformation in the
same mode, which leads to extra stress and displacements on shafting, especially as the resonant frequencies of
different vibration modes match each other. This is helpful to prevent ship stern vibration due to poor shafting vibration calculation.
YANG Yong1,2 (杨勇), CHE Chi-dong1* (车驰东), TANG Wen-yong1 (唐文勇)
. Shafting Coupled Vibration Research Based on Wave Approach[J]. Journal of Shanghai Jiaotong University(Science), 2014
, 19(3)
: 325
-336
.
DOI: 10.1007/s12204-014-1506-6
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