Dynamic performance of super micro high speed air bearings
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摘要: 对微型转子(半径为1985mm)动态特性进行了数值模拟和实验研究。在数值模拟中,利用ANSYS对空气轴承微转子系统进行了双向瞬态流固耦合研究;模拟了启动阶段转子在空气轴承调节下的运动过程。结果表明:转子的动态过程为一运动幅度逐渐减小的振荡过程,最后将稳定于某一平衡位置;在轴承供压越大时,转子运动幅度越大,且达到稳定所需时间更长。计算结果发现了轴承间隙宽度与轴承流量的正相关关系。在对应实验中,实验结果与模拟结果很好的相符。由数值模拟和实验研究,说明了在较大止推轴承供压下由于转子轴向运动幅度大,有更大发生碰撞的风险;而在70927Pa的供压下进行启动则更为合适。Abstract: The dynamic performance of micro rotor (radius of 1985mm) was numerically and experimentally investigated.In numerical simulation, transient twoway fluidsolid coupling simulation was carried out by using ANSYS. The dynamic process of rotors position in initial stage under the effects from air bearings was simulated. The results showed that the displacement process of rotor presented a vibration motion with reducing amplitude as the elapse of time and the rotor ultimately stabilized to an equilibrium position. For higher levels of supply pressure of thrust bearing, larger range of displacement of rotor appeared and the rotor spent more time reaching stabilization. Besides, the positive relationship between air bearing gap height and bearing flow rate was revealed in results. In corresponding experiments, the experiment results were in good agreement with simulations. The numerical and experimental results show that the rotor has a greater risk of collision because the range of displacement of rotor is bigger at higher level of supply pressure of thrust bearing. Supply pressure of 70927Pa is more suitable for thrust bearing in initial stage.
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Key words:
- micro engine /
- dynamic performance /
- air bearings /
- fluidsolid coupling /
- rotor
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[1] FAN L S,TAI Y C,MULLER R S.IC:processed electrostatic micromotors[J].Sensors and Actuators,1989,20(1/2):41-47. [2] TRIMMER W S N,GABRIEL K J.Design considerations for a practical electrostatic micromotor[J].Sensors and Actuators,1987,11(2):189-206. [3] TEE K P,GE S S,TAY F E H.Adaptive control of electrostatic microactuators with bidirectional drive[J].IEEE Transactions on Control Systems Technology,2009,17(2):340-352. [4] YANG C,ZHAO X,DING G,et al.An axial flux electromagnetic micromotor[J].Journal of Micromechanics and Microengineering,2001,11(2):113-117. [5] CARICCHI F,CRESCIMBINI F,SANTINI E.Axial flux electromagnetic differential induction motor[C]∥Proceedings of Seventh International Conference on Electrical Machines and Drives.Durham,UK:the Institution Engineering and Technology,1995:1-5. [6] DING G.Fabrication of stator winding of electromagnetic micromotor with 1mm diameter[C]∥Proceedings of Asia Pacific Symposium on Microelectronics and MicroElectro Mechanical Systems.Gold Coast,Australia:International Society for Optics and Photonics,1999:352-358. [7] LONDON A P,AYN A A,EPSTEIN A H,et al.Microfabrication of a high pressure bipropellant rocket engine[J].Sensors and Actuators:A Physical,2001,92(1):351-357. [8] EPSTEIN A H.Millimeterscale,microelectromechanical systems gas turbine engines[J].Journal of Engineering for Gas Turbines and Power,2004,126(2):205-226. [9] TEO C J.MEMS turbomachinery rotor dynamics:modeling,design and testing[D].Cambridge,US:Massachusetts Institute of Technology,2006. [10] LIN C C.Development of a microfabricated turbinedriven air bearing rig[D].Cambridge,UK:Massachusetts Institute of Technology,1999. [11] EPSTEIN A H,SENTURIA S D.Macro power from micro machinery[J].Science,1997,276(5316):1211-1211. [12] BOFFEY D A,DESAI D M.An experimental investigation into the rubberstabilization of an externallypressurized airlubricated thrust bearing[J].Journal of Tribology,1980,102(1):65-70. [13] ROUDEBUSH W H.An analysis of the effect of several parameters on the stability of an airlubricated hydrostatic thrust bearing[EB/OL].[20160821].Http:∥digital.library.unt.edu/ark:/67531/metadc56526/. [14] CHEN N N S,HO K W.Performance study of a hydrostatic air thrust bearing[J].Wear,1981,70(2):207-217. [15] LICHT L,ELROD H.A study of the stability of externally pressurized gas bearings[J].Journal of Applied Mechanics,1958,27(2):269-271. [16] LIU Ren,WANG Xiaoli.Dynamic characteristics analysis of micro air spiral grooved thrust bearingrotor system[C]∥Proceedings of 2011 IEEE International Conference on Nano/Micro Engineered and Molecular Systems (NEMS).Kaohsiung,China:IEEE,2011:719-723. [17] ANSYS Incorporation.Structural analysis guide[M].Canonsburg,US:ANSYS Incorporation,1998. [18] TEO C J,SPAKOVSZKY Z S.Modeling and experimental investigation of microhydrostatic gas thrust bearings for microturbomachines[J].Journal of Turbomachinery,2006,128(4):597-605. [19] IDELCHIK I E,FRIED E.Handbook of hydraulic resistance[M].New York:Hemisphere Publishing Corporation,1986.
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