MODELING BEHAVIOR OF SHIP SHAFTING AT TRANSVERSE VIBRATIONS AND IN FLOODING THE LUBRICANT SUPPORT BEARINGS

Abstract

Purpose. The aim of the work is to improve the methods of analyzing the dynamics of ship shaft-wires with hydrodynamic bearings. Methodology. Synthesis methods for dynamic analysis of rotor systems with  liquid friction bearings that take into account the change in the elastic-damping properties of the carrier layer was carried out in two stages. At the first stage, solution of the problem of ship shafting dynamics, consisted in determining non-conservative forces in the carrier layer, which are a response to the external variable harmonic load. At the second stage, the problem was solved, the dynamics of the ship shafting, under conditions of anisotropy of the carrier layer caused by diffusion and mass transfer processes in the hydraulic bearing path. Results. Modeling of the behavior of the rotary system based on the created finite element model of the ship shafting of the sea trawler is carried out. Circular diagrams of vibro-displacement of axes of shafts along the trajectories of mobile balance in the supports of the ship shaft line are obtained for different degrees on water-saturated of lubricating oil. Originality. The technique of dynamic analysis of rotor systems, taking into account the processes of diffusion and mass transfer of the water-saturated oil in the hydraulic path of the radial hydrodynamic bearing, has been further developed. Practical value. The obtained parameters of the vibration displacement of the axles of the shafting along the trajectories of the mobile equilibrium in the supports of the ship shafting line allow the complement existing monitoring systems of the technical state and also gives the chance to develop algorithms of action of the operator in extreme conditions of operation.