参数可调椭圆滑动轴承转子系统动力学研究及抑振机理
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摘要
椭圆滑动轴承在许多大型和关键设备中被广泛应用。常见的椭圆滑动轴承都是针对某种特定工况设计的,在实际运行过程中,转速和载荷等工况参数的变化会影响轴承支撑的转子系统的动力学特性。仅研究稳定工况下的动力学特性不能满足实际工况要求。为适应时变工况,维持转子轴承系统在不同工作状态下的稳定性,提出一种参数可调椭圆轴承。通过调节轴承油膜间隙,研究椭圆度对轴承油膜刚度和阻尼的影响,然后在不同椭圆度下对转子轴承系统进行动力学分析。最后搭建转子轴承试验台,通过试验验证调节椭圆轴承的油膜间隙可有效地抑制转子的振动。
Elliptical bearings are widely used in many large and critical equipments. Elliptical bearings are usually designed based on certain conditions. However, in the actual operation processes, the speed and load parameter changes affect the dynamic characteristics of rotor bearing support system. The dynamic characteristics under the steady conditions do not meet the actual working conditions. In order to adapt to the time-varying conditions and maintain the stability of the rotor bearing system under different working conditions, an elliptical bearing with adjustable parameters is proposed in this study. By adjusting the oil film gap of the bearing, the influences of ellipticity on the stiffness and damping of the bearing oil film is studied. Then the dynamic analysis for the rotor bearing systems with different ellipticity values is carried out. Finally, a test rig for rotor bearing is set up to verify that the rotor vibration can be effectively suppressed by adjusting the oil film gap of the elliptical bearing.
Elliptical bearings are widely used in many large and critical equipments. Elliptical bearings are usually designed based on certain conditions. However, in the actual operation processes, the speed and load parameter changes affect the dynamic characteristics of rotor bearing support system. The dynamic characteristics under the steady conditions do not meet the actual working conditions. In order to adapt to the time-varying conditions and maintain the stability of the rotor bearing system under different working conditions, an elliptical bearing with adjustable parameters is proposed in this study. By adjusting the oil film gap of the bearing, the influences of ellipticity on the stiffness and damping of the bearing oil film is studied. Then the dynamic analysis for the rotor bearing systems with different ellipticity values is carried out. Finally, a test rig for rotor bearing is set up to verify that the rotor vibration can be effectively suppressed by adjusting the oil film gap of the elliptical bearing.
引文
[1] Lee A S, Kim B O, Kim Y C. A finite element transient response analysis method of a rotor-bearing system to base shock excitations using the state-space Newmark scheme and comparisons with experiments[J].Journal of Sound & Vibration, 2006, 297(3):595-615.
[2] Han Q K, Chu F L. Parametric instability of flexible rotor-bearing system under time-periodic base angular motions[J]. Applied Mathematical Modelling, 2015,39(15):4 511-4 522.
[3] 刘树鹏. 舰船纵横倾作用下转子轴承系统动力学特性研究[D]. 哈尔滨:哈尔滨工业大学,2011.
[4] Dhawan R, Verma S. Analyzing micropolar lubrication in noncircular hybrid journal bearings[J].Tribology Transactions, 2014,57(2): 182-189.
[5] 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): 156-190.
[6] Schweizer B. Dynamics and stability of turbocharger rotors[J]. Archive of Applied Mechanics, 2010, 80(9): 1 017-1 043.
[7] Schweizer B. Oil whirl, oil whip and whirl/whip synchronization occurring in rotor systems with full-floating ring bearings[J]. Nonlinear Dynamics, 2009, 57(4): 509-532.
[8] Prabhakaran N, Sukumaran N, Jayadas N. Static and dynamic analysis of elastohydrodynamic elliptical journal bearing with micropolar lubricant[J]. TribologyInternational, 2007, 40(1):297-305.
[9] Rahmatabadi A D, Nekoeimehr M. Rashidi R. Micropolar lubricant effects on the performance of noncircular lobed bearings[J].Tribology International, 2010(43):404-413.
[10] 陈红霞,陈国定,李盼. 偏载条件下椭圆轴承的静动特性[J].润滑与密封, 2013, 38(1):66-73.
[11] 张宏献,徐武彬,王镇江,等. 椭圆度对椭圆滑动轴承稳定性的影响[J].中国机械工程,2011,22(20):2 466-2 468.
[12] 张磊,裴世源,徐华. 摇摆工况下两种舰船转子轴承系统的安全性与稳定性研究[J].中国科学:技术科学,2018,48(4):369-381.
[13] 张磊,裴世源,徐华,等. 摇摆工况下椭圆轴承转子系统动力学特性研究[J].机械设计与制造,2018(7):100-103.
[14] 张磊,裴世源,徐华,等. 摇摆工况下错位瓦轴承支撑的转子系统动力学特性[J].中国机械工程,2017,28(18):2 161-2 170.
[2] Han Q K, Chu F L. Parametric instability of flexible rotor-bearing system under time-periodic base angular motions[J]. Applied Mathematical Modelling, 2015,39(15):4 511-4 522.
[3] 刘树鹏. 舰船纵横倾作用下转子轴承系统动力学特性研究[D]. 哈尔滨:哈尔滨工业大学,2011.
[4] Dhawan R, Verma S. Analyzing micropolar lubrication in noncircular hybrid journal bearings[J].Tribology Transactions, 2014,57(2): 182-189.
[5] 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): 156-190.
[6] Schweizer B. Dynamics and stability of turbocharger rotors[J]. Archive of Applied Mechanics, 2010, 80(9): 1 017-1 043.
[7] Schweizer B. Oil whirl, oil whip and whirl/whip synchronization occurring in rotor systems with full-floating ring bearings[J]. Nonlinear Dynamics, 2009, 57(4): 509-532.
[8] Prabhakaran N, Sukumaran N, Jayadas N. Static and dynamic analysis of elastohydrodynamic elliptical journal bearing with micropolar lubricant[J]. TribologyInternational, 2007, 40(1):297-305.
[9] Rahmatabadi A D, Nekoeimehr M. Rashidi R. Micropolar lubricant effects on the performance of noncircular lobed bearings[J].Tribology International, 2010(43):404-413.
[10] 陈红霞,陈国定,李盼. 偏载条件下椭圆轴承的静动特性[J].润滑与密封, 2013, 38(1):66-73.
[11] 张宏献,徐武彬,王镇江,等. 椭圆度对椭圆滑动轴承稳定性的影响[J].中国机械工程,2011,22(20):2 466-2 468.
[12] 张磊,裴世源,徐华. 摇摆工况下两种舰船转子轴承系统的安全性与稳定性研究[J].中国科学:技术科学,2018,48(4):369-381.
[13] 张磊,裴世源,徐华,等. 摇摆工况下椭圆轴承转子系统动力学特性研究[J].机械设计与制造,2018(7):100-103.
[14] 张磊,裴世源,徐华,等. 摇摆工况下错位瓦轴承支撑的转子系统动力学特性[J].中国机械工程,2017,28(18):2 161-2 170.