人字槽动压滑动轴承—转子系统的动态特性研究

发布时间：2018-03-20 04:00

本文选题：人字槽轴承　切入点：有限差分法　出处：《天津大学》2012年硕士论文　论文类型：学位论文

【摘要】：随着工业的现代化进程,旋转机械越来越向高速度和大功率发展,对于轴承的性能要求也越来越高。轴承结构是决定轴承性能的关键因素。螺旋槽轴承作为一种新型轴承,能有效改善轴承动特性和热特性。近年来,人字型的螺旋槽轴承的实际应用尤为广泛。本文针对人字槽径向动压滑动轴承进行数值分析,对其静特性和动特性进行深入研究,并建立了转子-轴承系统,对系统进行稳定性和动力学分析,为螺旋槽轴承-转子系统的设计提供了依据。论文主要工作如下: 1.采用有限差分法对雷诺方程进行求解,计算人字槽径向动压轴承的静态特性,并分析了人字槽轴承偏心率、螺旋角、深度、槽数、轴承宽径比和转速等参数变化对人字槽轴承静态特性的影响。结果表明人字槽轴承具有更好的稳定性,但承载力较普通轴承有所降低。 2.利用压力扰动法求解非定常雷诺方程。利用局部积分得到斜坐标系下雷诺方程的差分形式,解得扰动压力并积分求得人字槽轴承的刚度和阻尼系数,分析了结构和工况参数对动特性的影响规律。 3.分别求解了普通轴承和人字槽轴承支承的单圆盘弹性转子系统的失稳转速,得到了结构参数对失稳转速的影响规律,并对不同结构轴承的稳定性进行了对比分析。结果表明人字槽轴承-转子系统稳定性更好,可以通过改变轴承结构参数提高整个系统稳定性。同时,分析求解了单圆盘轴承-转子系统的临界转速与不平衡响应。
[Abstract]:With the modernization of industry, rotating machinery is developing to high speed and high power, and the performance requirement of bearing is higher and higher. The structure of bearing is the key factor to determine the performance of bearing. As a new type of bearing, spiral groove bearing is a new type of bearing. It can effectively improve the dynamic and thermal characteristics of bearings. In recent years, the practical application of herringbone spiral groove bearings is particularly extensive. In this paper, numerical analysis of herringbone groove radial dynamic sliding bearings is carried out, and its static and dynamic characteristics are deeply studied. The rotor-bearing system is established, and the stability and dynamics of the system are analyzed, which provides the basis for the design of the bearing-rotor system with spiral grooves. The main work of this paper is as follows:. 1. The Reynolds equation is solved by the finite difference method, the static characteristics of the herringbone groove radial dynamic bearing are calculated, and the eccentricity, spiral angle, depth, slot number of the herringbone groove bearing are analyzed. The results show that the herringbone groove bearing has better stability, but its bearing capacity is lower than that of common bearing. 2. The unsteady Reynolds equation is solved by the pressure perturbation method. The difference form of the Reynolds equation in oblique coordinate system is obtained by using the local integral. The disturbance pressure is solved and the stiffness and damping coefficient of the herringbone groove bearing are obtained by integral. The influence of structure and operating parameters on dynamic characteristics is analyzed. 3. The instability speed of single disk elastic rotor system supported by ordinary bearing and herringbone groove bearing is solved, and the influence of structural parameters on instability speed is obtained. The stability of bearings with different structures is compared and analyzed. The results show that the stability of the bearing rotor system with herringbone groove is better, and the stability of the whole system can be improved by changing the structural parameters of the bearing. The critical speed and unbalance response of a single disk bearing-rotor system are analyzed and solved.
【学位授予单位】：天津大学
【学位级别】：硕士
【学位授予年份】：2012
【分类号】：TH113.22

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