Stabilization of vibrations of rotary machines in radial sliding bearings with integrated liquid

Aleksandr Kiryukhin, S. Roshchupkin, S. Leonov, S. Gorbatyuk, S. Bratan
2018 MATEC Web of Conferences  
The use of radial bearings with segments on a self-generated hydrostatic suspension has been substantiated in order to satisfy the requirements for precision positioning of axes and efficiency of stabilization of shaft oscillations of power-consuming rotary machines. The methods of turbomachine dynamical analysis based on the modelling of the viscous friction forces process and inertia in lubricating films that balance the harmonic loads on the shaft by redistributing the lubricant flow
more » ... ricant flow parameters in the bearing gaps with integrated liquid dampers have been further developed. The complex approach for improving functional properties of turbomachine supporting block on the basis of multicriteria optimization of hydraulic tracts parameters and lubrication system operating modes is presented. One of the main trends in the development of stationary and transport energy is the increase in the productivity of rotary machines, while increasing the resources and reducing the costs of production and operation. With regard to ship turbomachines, the consequence is an increase in the specific powers and rotational speeds of the main and auxiliary turbine units, accompanied by an increase in the masses and overall size of the rotors and, correspondingly, the increase in the forces and their moments acting in the rotational parts, the development of oscillations and the growth of mechanical losses when generation, transformation and transmission of energy on board. Durability and reliability of rotary machines, in the first place, depend on the operation mode of tribocoupling in supporting blocks. Under the operational factors influence, tribomechanical and rheological processes are activated in the bearings, which contribute to dissipation of the supplied mechanical energy as to destructive mechanisms that cause the nutation of the rotor and the wear of the support nodes, and the protective ones in the implementation of which the resource for improving the operability of the machines is laid. Among the directions for improving which are traditionally used sliding bearings in power engineering, constructive measures to prevent the cases of rotors self-oscillations are dominated by modifying the geometry of the friction surfaces (the use of lubricating grooves of various configurations and sizes, the creation of several lubricating wedges, etc.) and due to the mobility of the sliding surfaces [1 − 11]. The low load-bearing capacity at start-up conditions, the appearance and development of subharmonic oscillations on lubricating wedges limit the use of two-, three-and multi-cylinder bush bearings in propulsion engines [5, 6, 7], * Corresponding author: alkiryukhin@yandex.ua
doi:10.1051/matecconf/201822402043 fatcat:66y7uwkbdjeflmerwtdf7hkvu4