Research On Temperature Rise And Thermal Deformation Characteristics Of Magnetic-hydraulic Double Suspension Bearing Under The Multi-field Coupling

The bearing capacity and stability of heavy equipment in the project mainly depend on the support system,so it is important to improve or innovate the large-scale support system.In the case of large external load changes and moderate and low speed conditions,the equipment needs to be started frequently,the response speed of the hydrostatic support is slow,and the flow adjustment is not timely,which increases the probability that the bearing is in a state of boundary lubrication or dry friction,while the electromagnetic and permanent magnet support systems are difficult to generate a large bearing capacity.In order to solve the problems,based on the characteristics and working mechanism of hydrostatic support and active electromagnetic support,this paper proposes a new type of support technology called magnetic-hydraulic double suspension support.The temperature rise,thermal deformation and heat dissipation of radial bearing under the coupling of multi-physics fields are studied.It is designed to improve bearing performance and stiffness,reduce heat loss and maintain stable operation.The main research contents are as follows:A new type of magnetic-hydraulic double suspension bearing is proposed,and the working principle and support theory are described.The mechanical model of the radial support system is derived according to the force relationship of the single-degree-of-freedom magnetic-hydraulic double suspension bearing.The influence of the rotor displacement change on the bearing capacity and stiffness is studied,and the optimal bearing cavity size and oil film thickness are determined.The structure of radial magnetic-hydraulic double suspension bearing is designed.Study the flow field,temperature field,and thermal elastic-plastic stress field of the magnetic-fluid double suspension bearing,analyze the main sources of heat loss,and solve the boundary conditions of fluid-solid-thermal coupling.Using the unidirectional fluid solid thermal coupling method,the radial magnetic-hydraulic double suspension bearing is simulated.Draw the cloud diagram of bearing flow field,temperature,stress and strain distribution.by adjusting the structural parameters and operating parameters of the bearing system,the effect of different parameter changes on the bearing temperature field and stator thermal deformation is solved.Establish the eddy current loss simulation model of the radial support unit and carry out the coupling calculation,analyze the influence of the simulation parameters on the eddy current loss of the magnetic sleeve and the thermal deformation due to temperature rise,and solve the eddy current loss,temperature field and thermal deformation of the bearing magnetic sleeve.The dissipation path of the eddy current loss of the magnetic sleeve is determined.By extracting the heat transfer rates between the magnetic sleeve-liquid,the magnetic sleeve-atmosphere,the magnetic sleeve-rotor,and the rotor-atmosphere,the influence of the structure and operating parameters on the heat dissipation law of the magnetic sleeve is studied.Simulate and solve the temperature field distribution of the bearing.By extracting the thermal deformation of a certain magnetic face,deformation of the radial bearing is obtained.After solving the heat transfer coefficient of the coupling surface,analyze the heat dissipation law of the bearing.Study the cooling efficiency of the magnetic-fluid double suspension bearing.analyze the influence of parameter changes on temperature rise and thermal deformation of the bearing.extracting the heat transfer rate between the coupled heat exchange surfaces,analyze the overall heat dissipation law,and explore the influence of parameter changes on the dissipation law of the two heat sources of the bearing.Build experimental test device of magnetic-hydraulic double suspension bearing.Test the temperature of the stator and the oil.Using the temperature sensor and data acquisition system to compare and analyze the error between the test data and the simulation results,verify the correctness of the simulation calculation.The experimental results provide a theoretical basis for the design of the magnetic-hydraulic double suspension bearing.