An optimal design method for water-lubricated thrust bearings with tilting pads made of resin-based composite materials for nuclear main pumps

Abstract

The invention relates to a nuclear main pump resin-based composite material tilting pad water lubrication thrust bearing optimized design method. The method is characterized in that the geometric dimension of the tilting pad and the thickness of a cylindrical tile surface serve as design variables, the bearing capacity and power loss of a bearing serve as optimization problems of an objective function, an initial sample point of the design variables is determined through sampling, and an elastohydrodynamic lubrication model simulating the coupling effect of interface slippage, water film cavitation and tile surface deformation is established; a Reynolds equation corrected by an ultimate shear stress model is converted into a linear complementary problem through a parameter quadratic programming algorithm, and the linear complementary problem and a solid elastic deformation equation are subjected to iterative solution to obtain the sample point of the design variables and a target function value data set corresponding to the sample point; a Kriging agent model algorithm is used, and accordingly to an optimization point adding rule criterion and iteration ending conditions, multi-objective optimization of the inner diameter, outer diameter and warp angle of a tilting pad slippage of the thrust bearing, the thickness of the tile surface and the like is finally achieved. The methodhas the advantage that high bearing capacity and the low power loss of the large low-elasticity-modulus material tilting pad thrust bearing are achieved.

Description

technical field [0001] The invention relates to an optimal design method for a tilting pad water-lubricated thrust bearing of a resin-based composite material of a nuclear main pump, belonging to the field of nuclear power equipment design and manufacture. Background technique [0002] The nuclear main pump is the equipment that drives the circulation of the high temperature and high pressure working medium in the nuclear island, transfers the thermal energy of the nuclear fission of the reactor core to the steam generator to generate steam, and drives the steam turbine to generate electricity. As the functional part of the nuclear main pump for long-term continuous load support and high-speed rotation, the performance of the thrust bearing directly determines the service life, safety and reliability of the nuclear main pump. The large-scale grid-connected power generation of large-scale advanced pressurized water reactor nuclear power plants puts forward higher and higher m...

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