Marine propulsion shafting connects between the host and the propellers to promote the movement of ship, varieties of Different coupled vibrations forms produce different kinds of coupled vibrations, the coupled vibration of propulsion shafting poses serious threat to the safety and reliability of the sailing of ship. Considering the uncertainty of the experimental test for propulsion shafting, the simulation technology of coupling dynamics becomes particularly significant. This paper introduces a finite element method in numerical modeling and simulation technology of coupled dynamics for propulsion shafting. Combined with the theory of coupled mechanics, the coupled longitudinal and transverse dynamic response of propulsion shafting under the condition of no-coupling and the coupled are compared. The structural dynamic characteristics of longitudinal and lateral loads are discussed respectively. Analysis shows that different forms of excitation have certain effects on the performance of coupled longitudinal and transverse vibration for propulsion shafting. The research aims to reveal the basic principle of coupled longitudinal and transverse vibration for marine propulsion shafting to improve the safety and reliability of the sailing performance of the ships.
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