Due to operational wear and uneven carbon absorption in compressor and turbine wheels, the unbalance (me) vibration is induced and could lead to sub-synchronous vibration accidents for high-speed turbocharger (TC). There are very few research works that focus on the magnitude effects on such induced unbalance vibration. In this paper, a finite element model (FEM) is developed to characterize a realistic automotive TC rotor with floating ring bearings (FRBs). The nonlinear dynamic responses of the TC rotor system with different levels of induced unbalance magnitude in compressor and turbine wheels are calculated. From the results of waterfall and response spectral intensity plots, the bifurcation and instability phenomena depend on unbalance magnitude during the startup of TC. The sub-synchronous component 0.12×caused rotor unstable is the dominant frequency for small induced unbalance. The nonlinear effects of induced unbalance in the turbine wheel is obvious stronger than the compressor wheel. As the unbalance magnitude increases from 0.05 g·mm to 0.2 g·mm, the vibration component changes from mainly 0.12×to synchronous vibration 1×. When unbalance increases continuously, the rotor vibration response amplitude is rapidly growing and the 1×caused by the large unbalance excitation becomes the dominant frequency. A suitable un-balance magnitude of turbine wheel and compressor wheel for the high-speed TC rotor with FRBs is proposed: the value of induced un-balance magnitude should be kept around 0.2 g·mm.
Guang-Fu Bin
,
Yuan Huang
,
Shuai-Ping Guo
,
Xue-Jun Li
,
Gang Wang
. Investigation of Induced Unbalance Magnitude on Dynamic Characteristics of High-speed Turbocharger with Floating Ring Bearings[J]. Chinese Journal of Mechanical Engineering, 2018
, 31(5)
: 88
-88
.
DOI: 10.1186/s10033-018-0287-5
Due to operational wear and uneven carbon absorption in compressor and turbine wheels, the unbalance (me) vibration is induced and could lead to sub-synchronous vibration accidents for high-speed turbocharger (TC). There are very few research works that focus on the magnitude effects on such induced unbalance vibration. In this paper, a finite element model (FEM) is developed to characterize a realistic automotive TC rotor with floating ring bearings (FRBs). The nonlinear dynamic responses of the TC rotor system with different levels of induced unbalance magnitude in compressor and turbine wheels are calculated. From the results of waterfall and response spectral intensity plots, the bifurcation and instability phenomena depend on unbalance magnitude during the startup of TC. The sub-synchronous component 0.12×caused rotor unstable is the dominant frequency for small induced unbalance. The nonlinear effects of induced unbalance in the turbine wheel is obvious stronger than the compressor wheel. As the unbalance magnitude increases from 0.05 g·mm to 0.2 g·mm, the vibration component changes from mainly 0.12×to synchronous vibration 1×. When unbalance increases continuously, the rotor vibration response amplitude is rapidly growing and the 1×caused by the large unbalance excitation becomes the dominant frequency. A suitable un-balance magnitude of turbine wheel and compressor wheel for the high-speed TC rotor with FRBs is proposed: the value of induced un-balance magnitude should be kept around 0.2 g·mm.
[1] C J Kim, Y J Kang, B H Lee, et al. Determination of optimal position for both support bearing and unbalance mass of balance shaft. Mechanism and Machine Theory, 2012, 50(50): 150-158.
[2] L S Andres, J C Rivadeneira, M Chinta, et al. Nonlinear rotordynamics of automotive turbochargers: predictions and comparisons to test data. ASME Journal of Engineering for Gas Turbines and Power, 2005, 129(2): 488-493.
[3] G C Ying, G Meng, J P Jing. Turbocharger rotor dynamics with foundation excitation. Archive of Applied Mechanics, 2009, 79(4): 287-299.
[4] S Rohde, H Ezzat. Analysis of dynamically loaded floating-ring bearings for automotive applications. Journal of Lubrication Technology, 1980, 102(3): 271-277.
[5] N S Hung. Rotordynamics of automotive turbochargers. Berlin: Springer Berlin Heidelberg, 2012.
[6] R G Kirk, A Alsaeed, E J Gunter. Stability analysis of a high-speed automotive turbocharger. Proceedings of the ASTLE / ASME International Joint Tribology Conference, San Antonio, TX, United States, October 23-25, 2006.
[7] Q H Li, W M Wang, P Y Qi, et al. Stability analysis and identification method for rotor-bearings system. Journal of Mechanical Engineering, 2014, 50(7): 54-59. (in Chinese)
[8] A Boyaci, W Seemann, C Proppe. Stability analysis of rotors supported by floating ring bearings. The 8th IFToMM International Conference on Rotor Dynamics, Seoul, Korea, 2010: 286-295.
[9] B Schweizer. Dynamics and stability of turbocharger rotors. Archive of Applied Mechanics, 2010, 80(9): 1017-1043.
[10] B Schweizer. Total instability of turbocharger rotors-physical explanation of the dynamic failure of rotors with full - floating ring bearings. Journal of Sound and Vibration, 2009, 328(1-2): 156-190.
[11] L Tian, W J Wang, Z J Peng. Effects of bearing outer clearance on the dynamic behaviors of the full floating ring bearing supported turbocharger rotor. Mechanical Systems and Signal Processing, 2012, 31(8): 155-175.
[12] L M Zhai, Y Y Luo, Z W Wang, et al. Failure analysis and optimization of the rotor system in a diesel turbocharger for rotor speed-up test. Advances in Mechanical Engineering, 2014, 6(4): 476023-1-8.
[13] E J Gunter, W J Chen. Dynamic analysis of a turbocharger in floating bushing bearings. Proceedings of the 3rd International Symposium on Stability Control of Rotating Machinery, Cleveland, Ohio, USA, September 19-23, 2005.
[14] A A Alsaeed. A study of methods for improving the dynamic stability of high-speed turbochargers. Virginia: Virginia Polytechnic Institute and State University, 2010.
[15] Sterling, A John. Influence of induced unbalance on subsynchronous vibrations of an automotive turbocharger. Blacksburg: Virginia Polytechnic Institute and State University, 2009.
[16] R G Kirk, A A Alsaeed. Induced unbalance as a method for improving the dynamic stability of high-speed turbochargers. International Journal of Rotating Machinery, 2011, 2011: 1-9.
[17] L Tian, W J Wang, Z J Peng. Nonlinear effects of unbalance in the rotor-floating ring bearing system of turbochargers. Mechanical Systems and Signal Processing, 2013, 34(1-2): 298-320.
[18] J F Yao, J J Gao, W M Wang. Multi-frequency rotor vibration suppressing through self-optimizing control of electromagnetic force. Journal of Vibration and Control, 2015, 21: 1-15.
[19] G B Wang, W H Deng, X Y Du, et al. The absolute deviation rank diagnostic approach to gear tooth composite fault. Shock and Vibration, 2017, 2017(17): 1-10.
[20] H Ma, F L Yin, X Y Tai, et al. Vibration response analysis caused by rubbing between rotating blade and casing. Journal of Mechanical Science and Technology, 2016, 30(5): 1983-1995.
[21] W J Chen. Rotordynamics and bearing design of turbochargers. Mechanical Systems and Signal Processing, 2012, 29(5): 77-89.
[22] W J Chen, E J Gunter. Introduction to dynamics of rotor-bearing systems. Victoria: Trafford Publishing, 2005.
