摘要
针对船舶可倾瓦推力轴承在实际运行过程中存在的轴系倾斜问题,建立倾斜状态下可倾瓦推力轴承热弹流体动压润滑计算模型,研究倾斜状态对可倾瓦推力轴承静动特性的影响。提出了以倾斜角和轴线投影角两个参数来表征倾斜状态的数学模型;联合热弹流体动压润滑模型和轴向油膜刚度、阻尼系数求解模型,全过程求解可倾瓦推力轴承静动特性。静态性能参数包括载荷、最小油膜厚度、最大油膜压力、最高油膜温度;动态性能参数包括轴向油膜刚度和阻尼系数。结果表明:轴线倾斜使每块瓦承受载荷严重不均,造成各块瓦巨大的性能差异;倾斜角增大使瓦所承受载荷、油膜压力和油膜温度增加,油膜厚度减小,且外载荷越大变化越显著;轴线投影角所在轴瓦承受载荷最大,当轴线投影角在支点附近时,静态性能参数皆有极值存在;轴线投影角在距瓦进油边31°的位置时推力轴承轴向油膜刚度和阻尼系数有最大值。研究结果可为倾斜状态下可倾瓦推力轴承可靠性的提高提供参考。
To solve the problem of shaft system inclination in the actual operation of marine tilting-pad thrust bearing,a thermo-elasto-hydro-dynamic(TEHD)model of tilting-pad thrust bearing is established,and the influence of inclination state on the static and dynamic performances of the bearing is studied.Firstly,a mathematical model is proposed to describe the inclination state with two parameters of inclined angle and axis projection angle.Then,the static and dynamic characteristics of the bearing are solved by combining the TEHD model and the axial oil film stiffness and damping coefficient solution model.Finally,the influences of inclined angle and axis projection angle on the static and dynamic characteristics of tilting-pad thrust bearing are analyzed.The static performance parameters include load,minimum oil film thickness,maximum oil film pressure and maximum oil film temperature;and the dynamic performance parameters include axial oil film stiffness and damping coefficient.The results show that the inclined axis makes each pad bear serious uneven load,resulting in great performance differences among the pads;the increasing inclination angle makes the load,oil film pressure and oil film temperature increase,but makes the oil film thickness decrease;and the larger the external load is,the more significant these changes will be.The bearing pad where the axis projection angle is located bears the largest load,and when the axis projection angle is near the fulcrum,the static performance parameters have extreme values.In addition,the maximum values of the axial oil film stiffness and damping coefficient can be found when the axis projection angle is 31°from the oil inlet side of the pad.This research may provide theoretical basis for improving reliability of the tilting-pad thrust bearing in inclination state.
作者
王报龙
王亚兵
刘洋洋
祝长生
袁小阳
WANG Baolong;WANG Yabing;LIU Yangyang;ZHU Changsheng;YUAN Xiaoyang(Key Laboratory of Education Ministry for Modern Design and Rotor-Bearing System,Xi’an Jiaotong University,Xi’an 710049,China;College of Electrical Engineering,Zhejiang University,Hangzhou 310058,China)
出处
《西安交通大学学报》
EI
CAS
CSCD
北大核心
2020年第7期129-138,共10页
Journal of Xi'an Jiaotong University
基金
基础产品创新科研资助项目(CZ362)
国家科技重大专项资助项目(2014ZX06901023)。
关键词
可倾瓦推力轴承
热弹流体动压润滑
轴线倾斜
静动特性
tilting-pad thrust bearing
thermo-elasto-hydro-dynamic lubrication
inclination
static and dynamic characteristics
