基于MATLAB的高速浮环动静压轴承特性研究
发布时间：2018-11-20 11:59
【摘要】：浮环动静压轴承具有承载力高、摩擦功耗低、精度高、稳定性好等优异性能,在高速轴承—转子系统如航天航空、空分、超精密磨床等领域得到越来越广泛的应用。高速浮环轴承的油膜振荡一直是制约转子向高速发展的瓶颈,目前对浮环轴承稳定性仍有待进一步研究。另一方面,轴承内外层油膜厚度均较小,浮环受力变形可能会对油膜厚度造成影响。因此,深入研究浮环动静压轴承静动特性、稳定性及浮环对轴承性能的影响,对于提高高速浮环轴承—转子系统性能至关重要。 本文以柱销内反馈径向浮环动静压轴承为研究对象,采用有限元方法建立内外膜静动特性仿真模型,在此基础上推导浮环轴承的稳定性判别方法。为了分析浮环变形对油膜厚度的影响,基于ANSYS求解了不同转速不同偏心下浮环变形情况并与油膜厚度进行了对比。研究的主要内容包括： 1.基于MATLAB的浮环动静压轴承静动特性仿真 使用MATLAB编制有限元法计算浮环动静压轴承内、外膜压力分布程序,然后计算不同转速、不同偏心率下浮环平衡时的静动特性。 2.浮环动静压轴承稳定性分析 在刚度、阻尼等动特性数据的基础上,建立判断浮环—轴承系统动力学方程组,通过判断特征方程根的特点,迭代出浮环—轴承系统的临界转速,据以保证所设计的轴承在额定转速下不发生自激振动。 3.基于ANSYS的浮环受力分析 使用ANSYS建立了浮环的实体模型、划分网格、加载承载力和约束条件,求解得到浮环的应力和应变结果。通过对不同转速、不同偏心率及不同厚度下的浮环仿真结果分析得出,在转速不太高、偏心率低于0.6时浮环的变形量相对于油膜厚度可以忽略不计,将浮环看作刚体进行研究可以满足要求；在转速较高、偏心率较大时,必须考虑浮环的变形量对油膜厚度的影响。 研究结果表明,浮环动静压轴承具有承载力高、摩擦功耗低、摩擦力矩小等优点,能有效提高轴承—转子系统的临界转速,适应了高速旋转机械的要求。
[Abstract]:Floating ring dynamic and static bearing has high bearing capacity, low friction power consumption, high precision and good stability. It is widely used in high-speed bearing-rotor systems such as aerospace, air separation, ultra-precision grinder and so on. The oil film oscillation of high speed floating ring bearing has been the bottleneck restricting the development of rotor to high speed. At present, the stability of floating ring bearing remains to be further studied. On the other hand, the oil film thickness of the inner and outer layers of the bearing is smaller, and the deformation of the floating ring may affect the oil film thickness. Therefore, it is very important to study the static and dynamic characteristics, stability and the influence of floating ring on the bearing performance for improving the performance of high-speed bearing rotor system. In this paper, the static and dynamic characteristics simulation model of internal and external membrane is established by using finite element method, and the stability judgment method of floating ring bearing is deduced based on the static and dynamic characteristics of radial floating ring bearing with inner pin feedback as the research object. In order to analyze the influence of floating ring deformation on oil film thickness, the deformation of floating ring under different rotation speeds and eccentricities was solved based on ANSYS and compared with oil film thickness. The main contents of the study include: 1. Simulation of static and dynamic characteristics of floating ring hydrostatic bearing based on MATLAB the finite element method is programmed by MATLAB to calculate the internal and outer membrane pressure distribution of the floating ring hydrostatic bearing and then the static and dynamic characteristics of the floating ring under different rotational speeds and different eccentricities are calculated. 2. On the basis of stiffness, damping and other dynamic characteristic data, the dynamic equations of floating ring bearing system are established, and the characteristics of the root of the characteristic equation are determined. The critical speed of the floating ring bearing system is iterated to ensure that the self-excited vibration of the designed bearing does not occur at the rated speed. 3. Based on ANSYS's analysis of floating ring force, the solid model of floating ring is established by ANSYS. The model is divided into meshes, the bearing capacity and constraint conditions are loaded, and the stress and strain results of floating ring are obtained. By analyzing the simulation results of floating ring with different rotational speed, different eccentricity and different thickness, it is concluded that when the speed is not too high and the eccentricity ratio is lower than 0.6, the deformation of floating ring can be ignored relative to the thickness of oil film. The study of floating ring as a rigid body can meet the requirements. When the rotational speed is high and the eccentricity is high, the influence of the deformation of floating ring on the oil film thickness must be considered. The results show that the bearing with floating ring has the advantages of high bearing capacity, low friction power consumption and low friction torque. It can effectively improve the critical speed of the bearing-rotor system and meet the requirements of high-speed rotating machinery.
【学位授予单位】：郑州大学
【学位级别】：硕士
【学位授予年份】：2011
【分类号】：TH133.36
本文编号：2344854
[Abstract]:Floating ring dynamic and static bearing has high bearing capacity, low friction power consumption, high precision and good stability. It is widely used in high-speed bearing-rotor systems such as aerospace, air separation, ultra-precision grinder and so on. The oil film oscillation of high speed floating ring bearing has been the bottleneck restricting the development of rotor to high speed. At present, the stability of floating ring bearing remains to be further studied. On the other hand, the oil film thickness of the inner and outer layers of the bearing is smaller, and the deformation of the floating ring may affect the oil film thickness. Therefore, it is very important to study the static and dynamic characteristics, stability and the influence of floating ring on the bearing performance for improving the performance of high-speed bearing rotor system. In this paper, the static and dynamic characteristics simulation model of internal and external membrane is established by using finite element method, and the stability judgment method of floating ring bearing is deduced based on the static and dynamic characteristics of radial floating ring bearing with inner pin feedback as the research object. In order to analyze the influence of floating ring deformation on oil film thickness, the deformation of floating ring under different rotation speeds and eccentricities was solved based on ANSYS and compared with oil film thickness. The main contents of the study include: 1. Simulation of static and dynamic characteristics of floating ring hydrostatic bearing based on MATLAB the finite element method is programmed by MATLAB to calculate the internal and outer membrane pressure distribution of the floating ring hydrostatic bearing and then the static and dynamic characteristics of the floating ring under different rotational speeds and different eccentricities are calculated. 2. On the basis of stiffness, damping and other dynamic characteristic data, the dynamic equations of floating ring bearing system are established, and the characteristics of the root of the characteristic equation are determined. The critical speed of the floating ring bearing system is iterated to ensure that the self-excited vibration of the designed bearing does not occur at the rated speed. 3. Based on ANSYS's analysis of floating ring force, the solid model of floating ring is established by ANSYS. The model is divided into meshes, the bearing capacity and constraint conditions are loaded, and the stress and strain results of floating ring are obtained. By analyzing the simulation results of floating ring with different rotational speed, different eccentricity and different thickness, it is concluded that when the speed is not too high and the eccentricity ratio is lower than 0.6, the deformation of floating ring can be ignored relative to the thickness of oil film. The study of floating ring as a rigid body can meet the requirements. When the rotational speed is high and the eccentricity is high, the influence of the deformation of floating ring on the oil film thickness must be considered. The results show that the bearing with floating ring has the advantages of high bearing capacity, low friction power consumption and low friction torque. It can effectively improve the critical speed of the bearing-rotor system and meet the requirements of high-speed rotating machinery.
【学位授予单位】：郑州大学
【学位级别】：硕士
【学位授予年份】：2011
【分类号】：TH133.36
【引证文献】
相关硕士学位论文 前2条
1 黄首峰;基于FLUENT的机床主轴动压轴承静特性研究[D];郑州大学;2012年
2 于冰;滑动轴承油膜流态可视化试验研究[D];郑州大学;2013年
，本文编号：2344854
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