| The bearing and rotor in a bearing-rotor system are mutually influential and inseparable.Coupled fluid-solid analysis acts as a cross-disciplinary research method and is a common way to analyze the effects between the fluid and solid domains of a system.During the study of the bearing-rotor system,the accuracy of the calculation results can be improved by combining the fluid-solid coupling analysis method and taking into account the mutual influence of the bearing and rotor during operation.The article take the slit throttle hydrostatic bearing as the basic research object,established the double-row slit throttle bearing basic flow field model.The flow field was analyzed using FLUENT.Firstly,the static characteristic parameters of two different slit forms were compared and the flow field was analyzed,after that,the static characteristics of the bearings were analyzed by changing the structural parameters of the continuous slit bearings and their optimal bearing parameters were determined.The GAMBIT software and SOLIDWORKS software are used to build a dynamic coupling calculation model of the slit throttle radial bearing-rotor system by combining the flow field and rotor motion,and the rotor model is analyzed by modal analysis in order to avoid the influence of critical speed on the coupling results.The model combined fluid mechanics and rotor dynamics,introduced pressure inertia term and centrifugal force inertia term in the flow field analysis,coupled the system fluid data and solid data by using the finite element analysis software ANSYS,established the steady-state coupling model of the bearing-rotor system,obtained the axial trajectory change curve under the coupling action of the system,and analyzed the dynamic flow field change under the dynamic coupling.The transient response of the bearing-rotor system was analyzed by varying the air supply pressure,rotor speed,step load and bearing parameters under the effect of step load,with full consideration of airflow inertia and dynamic pressure effect.According to different bearing parameters as well as different air supply pressure and rotor speed,the curve variation relationship of step load on the displacement in the direction of the load applied to the rotor is used to analyze the rapidity and smoothness of the rotor system response using transient response parameters.The simulation calculation showed that: the decrease of the system air supply pressure,the increase of the external load,the increase of the rotational speed and the increase of the slit bearing depth will decrease the system rapidity and increase the system smoothness;the increase of the slit distance and the slit width will increase the system rapidity and then decrease,and the smoothness will first decrease and then increase.Finally,the Dover Revolution XL air spindle was used as the research object to carry out rotor error analysis and rotation accuracy test,simplify the spindle system structure,establish dynamic coupling model for coupling calculation,and conduct comparative analysis on the change of rotor’s axis trajectory at different rotational speeds. |
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