Effect of Inlet Oil Temperature on Vibration Characteristics of High-speed Light-load Turbocharger Rotor under Long Period and Variable Speed

doi:10.3901/JME.2020.21.131

Abstract

Abstract: The inlet oil temperature of high-speed and light-loaded turbocharger system changes dynamically under the operating conditions of long period and variables speed, thus changing the vibration characteristics of the rotor system and even leading to nonlinear vibration accidents. High-speed and light-load turbocharger system for a certain type of gasoline engine is studied. The variation of minimum thickness and eccentricity ratios of inner oil film in floating ring bearing with different inlet oil temperature is analyzed. The dynamic finite element model of turbocharger rotor-floating ring bearing system is constructed. Under the turbocharger speed up experiment and simulation calculation, adopting Newmark integral method to analyze the nonlinear transient response of the rotor system, the waterfall and Colormap of the rotor system are obtained under different inlet oil temperatures. Exploring the influence of inlet oil temperature on vibration response characteristics of rotor system. The results show that when inlet oil temperature rises from 50℃ to 130℃, the inner oil film minimum thickness decreases, the ring speed ratio and eccentricity ratios increase, and the whip amplitude of the inner oil film decreases gradually. But the rotational speed of the journal is earlier approximately by 30% when inner oil film whip and outer oil whirl, the outer oil film whirl amplitude is gradually increased. Considering the inner and outer oil film whirl and vibration amplitude, the rotor vibration reaches to the lowest level when the inlet oil temperature is about 90℃. Such findings can provide theoretical reference for future design of high speed and light-loaded turbocharger systems with intelligent anti-vibration performance feature.

Key words: oil supply temperature, dynamic pressure oil film characteristics, harmonic response analysis, oil film whirl, turbocharge rotor

CLC Number:

TG156

BIN Guangfu, HUANG Yuan, ZHONG Xinli, YANG Feng, MAO Zhengyu. Effect of Inlet Oil Temperature on Vibration Characteristics of High-speed Light-load Turbocharger Rotor under Long Period and Variable Speed[J]. Journal of Mechanical Engineering, 2020, 56(21): 131-139.

References

[1] SAN ANDRES L,KERTH J. Thermal effects on the performance of floating ring bearings for turbochargers[J]. Proceedings of the Institution of Mechanical Engineers,Part J:Journal of Engineering Tribology,2004,218(5):437-450.
[2] GUO H,YANG S,ZHANG S L,et al. Influence of temperature-viscosity effect on ring-journal speed ratio and stability for a hydrodynamic floating ring bearing[J]. Industrial Lubrication and Tribology,2019,71(4):540-547.
[3] CHUN S M. Aeration effects on the performance of a turbocharger journal bearing[J]. Tribology International,2008,41(4):296-306.
[4] 张浩,师占群,张顺心,等.基于质量守恒边界条件的浮环轴承贫油润滑特性理论分析[J].机械工程学报,2014,50(9):100-107. ZHANG Hao,SHI Zhanqun,ZHANG Shunxin,et al. A theoretical investigation on starved lubricating characteristics of the floating ring bearing based on jakobsson-floberg-olsson boundary condition[J]. Journal of Mechanical Engineering,2014,50(9):100-107.
[5] 李佳琪,倪计民,石秀勇,等.增压器浮环轴承润滑和散热性能的影响因素研究[J].机械工程学报,2017,53(17):141-148. LI Jiaqi,NI Jimin,SHI Xiuyong,et al. Study on static thermo-hydrodynamic lubrication of floating ring bearing[J]. Journal of Mechanical Engineering,2017,53(23):108-115.
[6] 池长青,赵丕智.浮环轴颈轴承的稳态特性[J].北京航空航天大学学报,1990(2):103-110. CHI Changqing,ZHAO Pizhi. Performance of floatingring journal bearings[J]. Journal of Beijing University of Aeronautics and Astronautics,1990(2):103-110.
[7] SCHWEIZER B. Dynamics and stability of turbocharger rotors[J]. Archive of Applied Mechanics,2010,80(9):1017-1043.
[8] SCHWEIZER B,SIEVERT M. Nonlinear oscillations of automotive turbocharger turbines[J]. Journal of Sound and Vibration,2009,321(3-5):955-975.
[9] SCHWEIZER B. Total instability of turbocharger rotors-physical explanation of the dynamic failure of rotors with full-floating ring bearings[J]. Journal of Sound and Vibration,2009,328(1-2):156-190.
[10] LEE I B,HONG S K. Effects of oil inlet pressure and temperature on the dynamic behaviors of a full-floating ring bearing supported turbocharger rotor[J]. The KSFM Journal of Fluid Machinery,2017,20(2):53-62.
[11] ZHANG C,MEN R,WANG Y,et al. Experimental and numerical investigation on thermodynamic performance of full-floating ring bearings with circumferential oil groove[J]. Proceedings of the Institution of Mechanical Engineers,Part J:Journal of Engineering Tribology,2019:1350650119826421.
[12] WANG L K,BIN G F,LI X J,et al. Effects of floating ring bearing manufacturing tolerance clearances on the dynamic characteristics for turbocharger[J]. Chinese Journal of Mechanical Engineering,2015,28(3):530-540.
[13] BIN G F,HUANG Y,GUO S P,et al. Investigation of induced unbalance magnitude on dynamic characteristics of high-speed turbocharger with floating ring bearings[J]. Chinese Journal of Mechanical Engineering,2018,31(1):88.
[14] WANG L K,BIN G F,LI X J,et al. Effects of unbalance location on dynamic characteristics of high-speed gasoline engine turbocharger with floating ring bearings[J]. Chinese Journal of Mechanical Engineering,2016,29(2):271-280.
[15] 张虹,刘张飞.基于船用涡轮增压器转子系统非线性振动特性研究[J].振动与冲击,2016,35(9):213-218. ZHANG Hong,LIU Zhangfei. Nonlinear vibration characteristics of a marine turbocharger rotor system[J]. Journal of Vibration and Shock,2016,35(9):213-218.
[16] 宾光富,黄源,钟新利,等.浮环轴向长度对高速轻载涡轮增压器转子系统振动特性影响研究[J].机械工程学报,2019,55(23):173-181. BIN Guangfu,HUANG Yuan,ZHONG Xinli. Study on the influence of floating ring axial length on vibration characteristics of high-speed and light-load turbocharger rotor system[J]. Journal of Mechanical Engineering,2019,55(23):173-181.
[17] 裴世源,徐华,石放辉.浮环轴承稳态热流体动力润滑分析[J].机械工程学报,2017,53(23):108-115. PEI Shiyuan,XU Hua,SHI Fanghui. Study on static thermo-hydrodynamic lubrication of floating ring bearing[J]. Journal of Mechanical Engineering,2017,53(23):108-115.
[18] LÜ Y J, ZHANG Y F, YU Y B,et al. Nonlinear dynamics of flexible rotor system supported on fixed-tilting pad combination journal bearing[J]. Journal of Central South University of Technology,2011, 18(3):610-617.
[19] TIAN L,WANG W J,PENG Z J. Dynamic behaviours of a full floating ring bearing supported turbocharger rotor with engine excitation[J]. Journal of Sound and Vibration,2011,330(20):4851-4874.
[20] CHEN W J. Practical rotordynamics and fluid film bearing design[M]. Eigen Technologies,Incorporated,2015.
[21] 李启行,王维民,刘宾宾,等.基于电磁激励的柔性转子系统轴承等效参数辨识[J].机械工程学报,2017,53(23):1-6. LI Qihang,WANG Weimin,LIU Binbin,et al. Electromagnetic-excitation-based identification method for identical rotor-bearings system parameters[J]. Journal of Mechanical Engineering,2017,53(23):1-6.
[22] 刘杨,李炎臻,石拓,等.转子-滑动轴承系统不对中-碰摩耦合故障分析[J].机械工程学报,2016,52(13):79-86. LIU Yang,LI Yanzhen,SHI Tuo,et al. Study on misalignment-rubbing coupling fault of rotor system supported by oil film force[J]. Journal of Mechanical Engineering,2016,52(13):79-86.
[23] 罗忠,刘昊鹏,朱云鹏,等.基于REFOR算法的多输出非线性系统动态参数化建模方法研究[J].机械工程学报,2018,54(23):73-81. LUO Zhong,LIU Haopeng,ZHU Yunpeng,et al. Dynamic parametrical modeling method of nonlinear aystems with multiple outputs based on REFOR algorithm[J]. Journal of Mechanical Engineering,2018,54(23):73-81.