1.Wuhan Institute of Marine Electric Propulsion, Wuhan 430064, China;
2.Theory of Lubrication and Bear Institute, Xi’an Jiaotong University, Xi’an 710049, China;
3.Key Laboratory of Education Ministry for Modern Design and Rotor-Bearing System,Xi’an Jiaotong University, Xi’an 710049, China
Abstract:Centration defect was investigated in a three-dimensional bolt-disk rotor according to the static-dynamic coupling analysis.The 3D finite element method and Newton iteration method were combined to study the static and dynamic properties of the defective bolt-disk rotor.Centration defect brings about mixed unbalance including constant mass eccentricity and speed-variant rotor bow.As a result, rotor bow leads to obvious stability reduction and vibration increment.No matter whether dynamic balance is conducted, entire bow determines that rotor vibration will still go up again after critical speed.This special feature of the bolt-disk rotor should be paid more attention in precision machining design.The allowable centration tolerance was obtained according to its stability characteristics which delivers a reason why the machining precision of radial location surfaces is highly demanded in the bolt-disk rotor.Uneven tightening was also presented to reduce adverse effects on dynamic properties when centration defect exists.
[1]黄锐, 邓博.国内外燃气轮机转子结构特点及9FA型燃机的模态分析[J].中国电力教育,2006(增刊3):60-64。
HUANG Rui,DENG Bo.Structural characteristics of gas turbine rotors at home and abroad and modal analysis of 9FA type combustion engine[J].China Electric Power Education, 2006(Sup3):60-64.
[2]何鹏.分布式拉杆转子动力学特性分析[D].哈尔滨:哈尔滨工业大学, 2009.
[3]章圣聪,王艾伦.盘式拉杆转子的振动特性研究[J].振动与冲击, 2009, 28(4):117-120.
ZHANG Shengcong, WANG Ailun.Research on vibration characteristics of disc tie rod rotor[J].Journal of Vibration and Shock, 2009, 28(4):117-120.
[5]LU Y J, JI L F, ZHANG Y F, et al.Dynamic behaviors of the rotor non-linear system with fixed-tilting-pad journal bearings support[J].Proceedings of the Institution of Mechanical Engineers, Part J: Journal of Engineering Tribology, 2010, 224(10): 1037-1047.
[6]LU Y J, DAI R, HEI D, et al.Stability and bifurcation of a non-linear bearing-flexible rotor coupling dynamic system[J].Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science,2009,223(4): 835-849.
[7]CHENG M, MENG G, JING J P.Numerical study of a rotor-bearing-seal system[J].Proceedings of the Institution of Mechanical Engineers,Part C: Journal of Mechanical Engineering Science,2007,221(7): 779-788.
[8]SHEN X Y, JIA J H, ZHAO M, et al.Numerical and experimental analysis of the rotor-bearing-seal system[J].Proceedings of the Institution of Mechanical Engineers,Part C: Journal of Mechanical Engineering Science,2008,222(7): 1435-1441.
[9]WAN Z, JING J P, MENG G, et al.Theoretical and experimental study on the dynamic response of multi-disk rotor system with flexible coupling misalignment[J].Proceedings of the Institution of Mechanical Engineers,Part C: Journal of Mechanical Engineering Science, 2012, 226(8): 2874-2886.
[10]LAZARUS A, PRABEL B, COMBESCURE D.A 3D finite element model for the vibration analysis of asymmetric rotating machines[J].Journal of Sound and Vibration, 2010, 329: 3780-3797.
[11]BATHE K J.Finite element procedures[D].New Jersey: Prentice-Hall, 2006.
[12]SIMO J C, LAURSEN T A.An augmented Lagrangian treatment of contact problems involving friction[J].Computers and Structures, 1992, 42: 97-116.
[13]SUNDARARAJAN P, NOAH S T.Dynamics of forced nonlinear systems using shooting/arclength continuation method- application to rotor system[J].ASME Journal of Vibration and Acoustics, 1997, 119: 9-20.
[14]FEY R H B, VAN CAMPEN D H, DE KRAKER A D.Long term structural dynamics of mechanical systems with local nonlinearities[J].ASME Journal of Vibration and Acoustics, 1996, 118: 147-153.
[15]WANG X, YAMAGUCHI A.Characteristics of hydrostatic bearing/seal parts for water hydr-aulic pumps and motors, Part 1: experiment and theory[J].Tribology International, 2002, 35(7): 425-433.
[16]SHANMUGAM A, PADMANABHAN C.A fixed-free interface component mode synthesis method for rotordynamic analysis[J].Journal of Sound and Vibration, 2006, 297: 664-679.