Effect Of Dimension Error On The Power Loss Of The Rotor Bearing System

With the deepening of the role of modern rotating machinery in the economic life, themeaning of the running state of the rotor system is also increasingly important. The fieldof analytical study about nonlinear dynamical characteristics of the bearing-rotor systemis many, especially the existence of the rotor of the oil film force, fluid excitation,electromagnetic force, rubbing, cracks, materials, shape, and so on, and the impact of thenonlinear oil film force is the most prominent. To the same type bearing-rotor system,although the selection of material, the approach and the kinetic model are the same, thereare some errors on each size, which is caused by the performance of materials, equipment,manufacturing methods, and the workplace. The bearing capacity depends mainly on thestructural relationship between the relative gaps, the relative width of the bearing corners,therefore there is deviation in the parameters of the rotor system, and the dimension errorbelongs to a manufacturing error which is a random variable.The study of domestic and foreign scholars show that manufacturing errors will havea major impact on the steady-state and dynamic performance of the system, some of thework being carried out, however, not enough depth, only analysis of the impact ofprocessing errors from the macro, analysis of the size of the error from the microscopicpoint of view doesn’t enough. In this paper, considering manufacturing errors on thesteady-state and dynamic performance of the bearing-rotor system, the size of the erroron the bearing rotor system energy loss, and the corresponding kinetic analysis.According to the exists of dimension error on hydrodynamic journal bearing system,a nonlinear oil film force model was established, and adopting2~k factor design,according to the existing different dimension error in the system, using the eccentricitycorresponding to the stability critical curve, analysis the effects of the friction power lossbrought by the dimension error of the dynamic viscosity, bearing width, bearing diameterand journal diameter, get the curves of carrying capacity, stability and friction power loss,besides the hydrodynamic journal bearing system experimental platform was establishedand the corresponding energy loss experimental was conducted. The effect to dynamiccharacteristics of the hydrodynamic journal bearing system was quantitative analyzed,the nonlinear dynamic analysis, modeling and calculation methods was studied whileconsidering the manufacturing errors.The experimental results show that in contrast to the impact of the error in journaldiameter, dynamic viscosity and bearing width, the bearing diameter error will lead to therise of the friction power, the dimension error will have different degrees of impact onthe journal bearing system, the friction power decreased as the eccentricity increase, andwhen the eccentricity at0.6948nearly the friction power reach to a minimum. It providesa theoretical basis to select reasonable parameter, find the best solution and reduceenergy consumption, then effectively control a variety of nonlinear dynamical behavior,and providing a theoretical basis and technical support for the hydrodynamic journalbearing system in parameters and tolerance design.