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上海理工大学 机械工程学院,上海 200093
SHEN Jingfeng, E-mail: sh_ jf@163.com
Received:07 September 2023,
Revised:22 November 2023,
Published:15 May 2025
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朱锐,沈景凤,卢明明,等. 液体动静压球轴承转子系统振动特性分析[J]. 机械强度,2025,47(5):1-11.
ZHU Rui,SHEN Jingfeng,LU Mingming,et al. Vibration characteristic analysis of the rotor system of spherical hybrid sliding bearing[J]. Journal of Mechanical Strength,2025,47(5):1-11.
朱锐,沈景凤,卢明明,等. 液体动静压球轴承转子系统振动特性分析[J]. 机械强度,2025,47(5):1-11. DOI: 10.16579/j.issn.1001.9669.2025.05.001.
ZHU Rui,SHEN Jingfeng,LU Mingming,et al. Vibration characteristic analysis of the rotor system of spherical hybrid sliding bearing[J]. Journal of Mechanical Strength,2025,47(5):1-11. DOI: 10.16579/j.issn.1001.9669.2025.05.001.
液体动静压球轴承在中高速下,动压效应使楔形空间内的流体发生涡动,转子的振动特性可能受到油膜涡动影响,主轴回转精度因此降低。针对小孔节流的液体动静压球轴承,将涡动形式分为柱面涡动与锥面涡动,建立润滑数学模型与转子动力学模型并联立求解,得到轴心轨迹与振动幅值;探究形心偏移距离、初始偏转角度对转子系统振动特性的影响。结果表明,与纯柱面涡动相比,综合考虑锥面涡动之后,轴心轨迹稳定性下降,振动幅值增加;随着形心偏移距离的增加,轴心轨迹的稳定性与振动幅值大幅度下降;随着初始偏转角度的增加,轴心轨迹的稳定性与振动幅值仅会小幅度下降。由此得出,改变形心偏移距离比改变初始偏转角度对轴承转子系统的轴心轨迹稳定性及转子系统的振动特性影响更大。
Under the medium and high speed of spherical hybrid sliding bearings
the dynamic pressure effect causes the fluid in the wedge space to whirl
and the vibration characteristics of the rotor may be affected by the oil whirl
so the rotation accuracy of the main shaft is reduced. The spherical hybrid sliding bearings with the orifice throttle was divided into cylindrical and conical whirl. The lubrication mathematical model and rotor dynamic model were established and solved simultaneously
the journal center trajectory and vibration amplitude were obtained. The influence of the centroid offset distance and initial deflection angle on the vibration characteristics of the rotor system were studied.The results show that
compared with the pure cylindrical whirl
the stability of the journal center trajectory decreases and the vibration amplitude increases after considering the conical whirl.With the increase of the centroid offset distance
the stability and vibration amplitude of the journal center trajectory decrease greatly.With the increase of the initial deflection angle
the stability and vibration amplitude of the journal center trajectory decrease only slightly.It can be concluded that changing the distance of the centroid offset has more influence on the stability of the journal center trajectory and the vibration characteristics of the rotor system than changing the initial deflection angle.
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