水润滑橡胶轴承支承转子系统动力学特性研究  

Study on the dynamic characteristics of rotor system supported on water-lubricated rubber bearings

作　　者：史永峰[1] 李明[1] 刘刚[1] 何琳[2] SHI Yong-feng LI Ming LIU Gang HE Lin(Department of Mechanics, Xi＇an University of Science and Technology, Xi＇an 710054, China Institute of Noise and Vibration, Naval University of Engineering, Wuhan 430033, China)

机构地区：[1]西安科技大学理学院力学系,西安710054 [2]海军工程大学振动与噪声研究所,武汉430033

出　　处：《船舶力学》2017年第5期584-594,共11页Journal of Ship Mechanics

基　　金：国家自然科学基金资助项目(11372245);陕西省自然科学基金资助项目(2014JM1015)

摘　　要：文章研究了水润滑橡胶轴承的动态特性及其在橡胶轴承支承下转子系统的动力学行为。首先,考虑了动压润滑和橡胶体的弹性变形等因素后,建立了水润滑橡胶轴承的水弹性动力润滑数学模型,根据载荷增量法与差分法,分析了轴承的刚度和阻尼。然后,选择集总参数法离散化转子系统,根据分析力学方法推导了水润滑橡胶轴承耦合转子系统的运动微分方程。最后,通过广义逆迭代法,研究了水润滑橡胶轴承支承的转子系统的动力学特性和稳定性,得到了转子-轴承系统的坎贝尔曲线,临界转速与振型以及失稳转速等。结果表明偏心率、间隙比、转速及长径比对轴承的动态特性的影响比较显著;轴承的水弹性润滑特性对系统的临界转速影响较大,橡胶轴承的弹性对系统的稳定性影响次之。The dynamic characteristics of water-lubricated rubber bearing and dynamic characteristics of rotor system supported on water-lubricated rubber bearings are studied. The mathematical model of water- lubricated rubber bearing is built based on the theory of elastohydrodynamic lubrication. Its dynamic char-acteristics are analyzed according to the load increment method and finite difference method. Then, the differential equation of rotor system coupled with the water-lubricated rubber bearing is deduced based on Lumped parameter method and the theory of Analytical Mechanics. Finally, the stability and dynamic characteristics of rotor system supported on water-lubricated rubber bearings are analyzed by using the generalized inverse iteration method. The critical speeds and its corresponding modes, and the threshold speed of stability, and so on are acquired. The results show that the parameters, such as the eccentricity, the length-diameter ratio, the relative clearance ratio and the speed, have a greater influence on dynamic char-acteristics ofwater-lubricated rubber bearings; the elastohydrodynamic lubrication characteristics of rubber bearing has a large effect on the critical speed of system, but the elastic deformation of rubber bearings has a little influence on the stability of system.

关 键 词：水润滑橡胶轴承 转子系统 动态特性 临界转速 稳定性 

分 类 号：U664.813[交通运输工程—船舶及航道工程]