圆柱气体轴承织构参数优化及动态特性的研究
发布时间：2018-11-24 16:13
【摘要】：近年来,气体轴承由于高精度、无污染等优点被广泛应用于高速精密机械、医疗器械及电子工业等行业。本文以气体轴承为研究对象,对织构参数进行优化,改善其润滑性能,运用阻抗近似法研究了气体轴承-转子系统的动态特性。具体内容如下:1、基于具有织构的圆柱气体轴承的数学模型,利用有限差分法求解了稳态可压缩流体润滑Reynolds方程,分析了织构形状、几何参数、位置、单元面积率及整体织构率对气体轴承润滑性能的影响,同时对比了具有织构的气体轴承与未织构气体轴承承载力和摩擦力的大小。2、基于CFD,通过建立不同形状、位置的织构计算流体模型,计算了具有织构的气体轴承压力分布,研究了不同形状、位置的织构对气体轴承润滑性能的影响,仿真结果表明织构能够有效地改善气体轴承的润滑性能。3、为了获得最优的润滑性能,基于织构加工中几何参数的可取范围,运用遗传算法对织构深度、半径和单元面积率进行了优化,经过一定代数的迭代计算,获得了最大的气体轴承承载力和最小的摩擦力。4、基于阻抗原理,运用阻抗近似法求得了气体轴承的动态刚度和阻尼系数,通过与偏导数法的计算结果对比,阻抗近似法得到了相似的结果,并且具有较好的精度。在此基础上,建立了气体轴承-转子系统的振动微分方程,计算得到了转子的固有频率与临界转速。本文的研究可为气体轴承-转子系统的优化设计提供理论参考,同时为气体轴承-转子系统的稳定性判定提供依据。
[Abstract]:In recent years, gas bearings have been widely used in high speed precision machinery, medical devices and electronic industries due to their high accuracy and no pollution. In this paper, the texture parameters of gas bearing are optimized to improve its lubricating performance. The dynamic characteristics of gas bearing rotor system are studied by using impedance approximation method. The main contents are as follows: 1. Based on the mathematical model of cylindrical gas bearing with texture, the Reynolds equation of steady compressible fluid lubrication is solved by using the finite difference method, and the texture shape, geometric parameters and position are analyzed. The effect of unit area ratio and integral texture ratio on lubricating performance of gas bearing is also discussed. At the same time, the bearing capacity and friction force of gas bearing with texture and untextured gas bearing are compared. 2. Based on CFD, different shapes are established. The pressure distribution of gas bearing with texture is calculated, and the influence of texture of different shape and position on lubricity of gas bearing is studied. The simulation results show that texture can effectively improve the lubricating performance of gas bearing. 3. In order to obtain the optimal lubrication performance, based on the desirable range of geometric parameters in texture processing, genetic algorithm is applied to the depth of texture. The radius and the unit area ratio are optimized, and the maximum bearing capacity and the minimum friction force are obtained by iterative calculation. 4, based on the impedance principle, The dynamic stiffness and damping coefficients of gas bearing are obtained by using the impedance approximation method. By comparing with the calculation results of partial derivative method, the impedance approximation method has obtained similar results and has good accuracy. On this basis, the vibration differential equation of gas bearing-rotor system is established, and the natural frequency and critical speed of the rotor are calculated. The research in this paper can provide a theoretical reference for the optimal design of gas bearing-rotor system and a basis for judging the stability of gas bearing-rotor system.
【学位授予单位】：西安理工大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TH133.3
本文编号：2354331
[Abstract]:In recent years, gas bearings have been widely used in high speed precision machinery, medical devices and electronic industries due to their high accuracy and no pollution. In this paper, the texture parameters of gas bearing are optimized to improve its lubricating performance. The dynamic characteristics of gas bearing rotor system are studied by using impedance approximation method. The main contents are as follows: 1. Based on the mathematical model of cylindrical gas bearing with texture, the Reynolds equation of steady compressible fluid lubrication is solved by using the finite difference method, and the texture shape, geometric parameters and position are analyzed. The effect of unit area ratio and integral texture ratio on lubricating performance of gas bearing is also discussed. At the same time, the bearing capacity and friction force of gas bearing with texture and untextured gas bearing are compared. 2. Based on CFD, different shapes are established. The pressure distribution of gas bearing with texture is calculated, and the influence of texture of different shape and position on lubricity of gas bearing is studied. The simulation results show that texture can effectively improve the lubricating performance of gas bearing. 3. In order to obtain the optimal lubrication performance, based on the desirable range of geometric parameters in texture processing, genetic algorithm is applied to the depth of texture. The radius and the unit area ratio are optimized, and the maximum bearing capacity and the minimum friction force are obtained by iterative calculation. 4, based on the impedance principle, The dynamic stiffness and damping coefficients of gas bearing are obtained by using the impedance approximation method. By comparing with the calculation results of partial derivative method, the impedance approximation method has obtained similar results and has good accuracy. On this basis, the vibration differential equation of gas bearing-rotor system is established, and the natural frequency and critical speed of the rotor are calculated. The research in this paper can provide a theoretical reference for the optimal design of gas bearing-rotor system and a basis for judging the stability of gas bearing-rotor system.
【学位授予单位】：西安理工大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TH133.3
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