Vibratory behaviors of Jeffcott system on cylindrical roller bearings

doi:10.1007/s11465-009-0036-7

Front Mech Eng Chin

2009, Vol. 4

Issue (3) : 305-309 https://doi.org/10.1007/s11465-009-0036-7

RESEARCH ARTICLE

Vibratory behaviors of Jeffcott system on cylindrical roller bearings

Hao WU, Jianwen WANG, Qi AN(

)

School of Mechanical and Power Engineering, East China University of Science and Technology, Shanghai 200237, China

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Abstract

A Jeffcott rotor system of cylindrical roller bearings is studied in detail. Its critical speed is calculated by a new calculation method with roller bearing stiffness and damping. The influences of bearing parameters, such as the roller length, rotor mass, distance between the bearings and the kinematics viscosity of oil on the system critical speed are numerically studied, and the influences of an oil film and damping on the critical speed are also studied. Regular curves of the relationship between the geometric parameters and the system critical speed are obtained. The results show that with increasing roller length and radial load, the critical speed increases; and with increasing rotor mass and the distance between the bearings and the kinematics viscosity, the critical speed decreases. This means that an oil film will decrease the critical rotational speed of the rotor system.

Keywords roller bearing bearing-rotor system design value critical rotational speed

Corresponding Author(s): AN Qi,Email:anqi@ecust.edu.cn

Issue Date: 05 September 2009

Cite this article:

Hao WU,Jianwen WANG,Qi AN. Vibratory behaviors of Jeffcott system on cylindrical roller bearings[J]. Front Mech Eng Chin, 2009, 4(3): 305-309.

URL:

https://academic.hep.com.cn/fme/EN/10.1007/s11465-009-0036-7
https://academic.hep.com.cn/fme/EN/Y2009/V4/I3/305

Fig.1 Stiffness model between the roller and the raceways

Fig.2 EHL model between the roller and the raceways

Fig.3 Jeffcott rotor with elastic support

Tab.1 Calculation parameters

Fig.4 Influence of distance between the bearings on critical speed

Fig.5 Influence of rotor mass on critical speed

Fig.6 Influence of roller length on critical speed

Fig.7 Influence of rotation speed on critical speed

Fig.8 Influence of kinematics viscosity on critical speed

Fig.9 Influence of oil film on critical speed

Fig.10 Influence of damping on critical speed

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