箔片动压气体轴承转子系统动态特性试验研究
Experimental Study on Dynamic Characteristics of Foil Dynamic Pressure Gas Bearing-Rotor System
张飞 1贾晨辉 1李东东 1路艳辉 1杨鲁强2
作者信息
- 1. 河南科技大学机电工程学院,河南洛阳 471003
- 2. 洛阳轴承研究所有限公司,河南洛阳 471039
- 折叠
摘要
在箔片动压气体轴承的润滑分析模型和动态特性数学模型基础上,结合牛顿力学方程,建立箔片动压气体轴承-转子系统动力学方程,并研究其刚度和阻尼系数的计算方法;试验测量箔片动压气体轴承-转子系统的振动及速度,计算其刚度和阻尼系数;结合图谱法分析箔片动压气体轴承-转子系统在升速过程中的线性失稳和非线性失稳现象,研究转速对其刚度和阻尼系数的影响规律.结果表明:箔片动压气体轴承-转子系统主刚度系数整体随着转速的升高而增大,而交叉刚度整体随着转速的增加而减小且变化趋势相对较为平缓;阻尼系数整体随转速的提高而减小;系统自身阻尼抑制了扰动和低频能量的聚集,避免了箔片振动发生,从而有效地提高了系统运行的稳定性.提出的动态特性系数计算方法结合气体润滑理论与动力学模型,并结合试验测试,可以有效地获得轴承-转子系统的动态特性.
Abstract
Based on the lubrication analysis model and dynamic characteristics mathematical model of foil dynamic pres-sure gas bearing,the dynamic equation of foil dynamic pressure gas bearing-rotor system was established combining New-ton's mechanical equation,and the calculation method of the stiffness and damping coefficient was studied.The vibration and speed of the foil dynamic pressure gas bearing-rotor system was tested,and the stiffness and damping coefficient was calculated.The linear and nonlinear instability phenomena of the foil dynamic pressure gas bearing-rotor system during the acceleration process was analyzed combining the mapping method,and the influence of speed on the stiffness and damping coefficient was studied.The results show that the mainstiffness coefficient of the foil dynamic pressure gas bearing rotor-system increases with the increase of speed,while the cross stiffness decreases with the increase of speed and the trend of change is relatively gentle.The damping coefficient decreases with the increase of speed.The damping of the system sup-presses disturbances and the accumulation of low-frequency energy,avoiding foil vibration and effectively improving the stability of the system operation.The proposed dynamic characteristic coefficient calculation method,combined with gas lu-brication theory and dynamic model,and combined with experimental testing,can effectively obtain the dynamic character-istics of the bearing-rotor system.
关键词
箔片气体轴承/轴承-转子系统/刚度系数/阻尼系数/气膜涡动与振荡/动态特性Key words
foil gas bearing/bearing-rotor system/stiffness coefficient/damping coefficient/gas film vortex and oscilla-tion/dynamic characteristic引用本文复制引用
基金项目
河南省科技研发计划联合基金(225101610002)
国家自然科学基金(51475142)
出版年
2024
NETL
NSTL
万方数据