Coupling Bearing Capacity Model And Bearing Performance Research Of Magnetic Liquid Double Suspension System

The magnetic liquid double suspension support system adopts two kinds of support forms of magnetic support and static pressure support,which can improve the bearing capacity and rigidity of the support system.The magnetic liquid double suspension support system described herein includes an electromagnetic-static double suspension bearing system and a permanent magnet-static double suspension support guide system.Due to the different arrangement of different supporting units,corresponding to different mechanical models,there is a lack of bearing capacity calculation method with universal applicability.However,correctly calculating the bearing capacity of each supporting unit is the premise for accurately designing the magnetic liquid double suspension support system and performing performance analysis.Therefore,this paper mainly analyzes the mathematical model and bearing performance of the coupled bearing capacity of the magnetic-liquid dualsuspension system,including the mathematical model of the bearing capacity of the supporting unit,the coupling relationship analysis of the bearing capacity of each supporting unit,and the main influencing factors of the bearing characteristics of the magnetic-liquid double-suspension bearing system.The main research contents of this paper are as follows:(1)For the electromagnetic-hydrostatic bearing support system and the permanent magnet-static pressure guide support system,the oil chamber of the support unit is complicatedly arranged,coupled with each other,and the calculation of bearing capacity has a problem of static stability,which is difficult to calculate.According to the deformation coordination equation of the oil film thickness,the static problem is transformed into a static problem.The final solution equation is generally applied to the bearing capacity of the oil chamber,and the correctness of the theoretical analysis is verified by experiments.(2)Based on the bearing capacity equation derived from the previous section,the coupling relationship between the bearing capacity of each bearing unit of the electromagnetic-static double suspension bearing system and the permanent magnet-static double suspension bearing system is analyzed,including the coupling relationship between the bearing capacity,liquid film thickness,liquid resistance,flow rate and other parameters,and draw the corresponding curve;At the same time,under the eccentric load,when the thickness of the liquid film of the supporting unit is uneven under the condition of quantitative oil supply,the flow rate of the oil chamber of one of the supporting units is adjusted to restore the thick state of the liquid film,thereby achieving horizontal suspension of the shaft/rail.(3)Taking the magnetic-liquid double-suspension bearing system as an example,the mathematical model of the single-degree-of-freedom support system in the constant flow supply mode is derived.Then the linearization and equivalent linearization method are used to process the single-degree-of-freedom system,and the mathematical expression and parameter sensitivity of the damping/stiffness relative error are obtained.Finally,the main influencing factors of the bearing performance of the magnetic liquid double suspension support system are obtained,and then the next step is to study the influence of the main influencing factors on the bearing performance of the magnetic liquid double suspension system.(4)This paper choses the bearing capacity,static stiffness and total power loss as the static index,the adjust time,dynamic stiffness and phase margin as the dynamic index,the natural frequency and the amplitude amplification coefficient as the vibration characteristics,and analyzed the influence liquid film thickness on the support performance of magnetic liquid double suspension system.