Research on Dynamic Characteristic of Marine Shafting-Oil Film-Stern Structure System

Abstract

The working conditions of the propulsion system of ships are affected by many factors and partially by hull deformations and lubricating oil film. In order to solve the problem of engineering application of reliability assessment and control of ship propulsion system on heavy sea, a mechanical model of ship shafting-oil film-stern structure coupled system is established. The hull and shafting are studied as a whole, and a test rig with the wave loads system is assembled. By carrying out the integrative analysis and physical experiment, the motion characteristics of the system are analyzed. According to the various types of wave loads which ship faces on ocean, the influence of the stern structure on the vibration characteristics of the shafting is obtained. It is concluded that the coupling degree of shafting and stern structure is correlated with the natural frequency of the coupled system, and the wave-induced loads response is correlated with wave encountering frequency. The characteristics of the shafting-oil film-stern structure system, such as the maximum amplitude of tail shaft and the minimum oil film thickness of bearing, are significantly modified under the influence of stern structure.

Study on the influence of ship collision upon propulsion shafting

“…The above equations are coupled to each other in which the coupling term in the stiffness matrix is called elastic coupling. It is difficult to decouple them directly [10], therefore, iterative steps for solving equations ( 7), (8), and ( 9) are described below: -The partial differential equation of the impacted ship motion, the dynamics equation of the shafting-oil film-stern structure system and the contact conditions of the impact point are considered, and programmed for calculation.…”

Study of the Influence of Nonlinear Dynamic Loads on Elastic Modulus of Carbonate Reservoir Rocks

“…Dynamic loads are taken into account while designing concrete [1] and aerospace [2] structures, tunnels [3], deeply buried constructions [4], propulsion system of ships [5], reinforced polymer structures in civil engineering [6] and many other fields. In those fields engineers deal with mechanical characteristics of different materials such as for example metals or composites.…”