船用水润滑橡胶轴承动力润滑特性及其应用

发布时间：2018-07-03 19:22

本文选题：橡胶轴承 + 接触　；参考：《西安科技大学》2015年硕士论文

【摘要】：水润滑橡胶轴承广泛应用于水轮机、水泵、船舶螺旋桨轴和涡轮钻机等传动系统中。本文以螺旋桨转子系统的舰尾后轴承为研究对象,讨论了板条式水润滑橡胶轴承的润滑特性,主要工作及结论如下:1、采用有限元方法分析舰尾后轴承的受力及各部分应力应变的分布规律,结果表明,受力越大的板条,越靠近螺旋桨的位置其轴向的应力变化越明显;周向受力较大部分的分布规律类似于抛物线;然后结合橡胶板条的实际结构情况,对在重力作用下,螺钉孔周围的橡胶受力情况做了进一步研究,所得结果为螺钉孔周围与轴颈接触的橡胶普遍大于与轴套接触的橡胶。2、从理论入手分析了在不考虑轴承弹性变形的情况下,轴承受力与偏心率、周角、膜厚及转速的关系,结果显示,轴承所受到压力峰值随偏心率的增大而增大。在不同轴承间隙下,偏心率在较小的范围内变化时摩擦力变化比较平缓,当偏心率大于某一数值继续增大时,摩擦力会快速增大。3、考虑了橡胶轴承在润滑水膜动压作用下的弹性变形,首先分析没有导水槽的橡胶轴承在工作情况下的受力,然后分析了常用的凹面V型的润滑特性。所得结论为,在弹流润滑分析中,转速与橡胶的受力并非简单的线性相关,转速是橡胶受力的主要因素,而轴承的结构对橡胶板条的总受力影响不大,却对应力分布情况起关键作用。4、主要研究了不同结构橡胶轴承的动力润滑特性,重点讨论了流场分布及橡胶板条的受力。分析结果表明,转速越大流场越紊乱,且橡胶板条的受力越均匀;梯形导水槽利于排水,在同样的偏心率和转速下,平面型的板条承载力要好于凹面型和凸面型。
[Abstract]:Water-lubricated rubber bearings are widely used in hydraulic turbines, pumps, ship propeller shafts and turbine drillers. In this paper, the lubricating characteristics of sliver water lubricated rubber bearings are discussed by taking the rear bearing of the propeller rotor system as the research object. The main work and conclusions are as follows: 1. Finite element method is used to analyze the stress and strain distribution of the rear bearing. The results show that the bigger the force is, the more obvious the axial stress change is near the propeller. The distribution of the larger part of the circumferential force is similar to that of the parabola. Then, considering the actual structure of the rubber strip, the rubber force around the screw hole under the action of gravity is further studied. The results show that the rubber in contact with the journal around the screw hole is generally larger than the rubber. 2. The relationship between bearing force and eccentricity, circumference angle, film thickness and rotational speed without considering the elastic deformation of the bearing is analyzed theoretically. The results show that the peak pressure of bearing increases with the increase of eccentricity. When the eccentricity ratio changes in a small range, the friction force changes slightly under different bearing clearances, and when the eccentricity is larger than a certain value, the friction force changes more slowly, and when the eccentricity ratio is larger than a certain value, The friction force will increase rapidly. The elastic deformation of rubber bearing under hydrodynamic pressure is considered. Firstly, the force of rubber bearing without guide tank is analyzed, and then the lubrication characteristics of V-type rubber bearing with concave surface are analyzed. It is concluded that in the elastohydrodynamic lubrication analysis, the rotational speed is not a simple linear correlation with the rubber force, and the rotational speed is the main factor of the rubber force, while the bearing structure has little effect on the total force of the rubber strip. But it plays a key role in stress distribution. The dynamic lubrication characteristics of rubber bearings with different structures are studied, and the distribution of flow field and the force of rubber strip are discussed. The results show that the larger the rotational speed is, the more disordered the flow field is, and the more uniform the rubber strip is, and the trapezoidal guide flume is favorable for drainage. At the same eccentricity and rotational speed, the bearing capacity of plane-type slab is better than that of concave and convex type.
【学位授予单位】：西安科技大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U664.21

【相似文献】