【摘要】：近年來,氣體軸承由于高精度、無污染等優(yōu)點被廣泛應(yīng)用于高速精密機械、醫(yī)療器械及電子工業(yè)等行業(yè)。本文以氣體軸承為研究對象,對織構(gòu)參數(shù)進行優(yōu)化,改善其潤滑性能,運用阻抗近似法研究了氣體軸承-轉(zhuǎn)子系統(tǒng)的動態(tài)特性。具體內(nèi)容如下:1、基于具有織構(gòu)的圓柱氣體軸承的數(shù)學模型,利用有限差分法求解了穩(wěn)態(tài)可壓縮流體潤滑Reynolds方程,分析了織構(gòu)形狀、幾何參數(shù)、位置、單元面積率及整體織構(gòu)率對氣體軸承潤滑性能的影響,同時對比了具有織構(gòu)的氣體軸承與未織構(gòu)氣體軸承承載力和摩擦力的大小。2、基于CFD,通過建立不同形狀、位置的織構(gòu)計算流體模型,計算了具有織構(gòu)的氣體軸承壓力分布,研究了不同形狀、位置的織構(gòu)對氣體軸承潤滑性能的影響,仿真結(jié)果表明織構(gòu)能夠有效地改善氣體軸承的潤滑性能。3、為了獲得最優(yōu)的潤滑性能,基于織構(gòu)加工中幾何參數(shù)的可取范圍,運用遺傳算法對織構(gòu)深度、半徑和單元面積率進行了優(yōu)化,經(jīng)過一定代數(shù)的迭代計算,獲得了最大的氣體軸承承載力和最小的摩擦力。4、基于阻抗原理,運用阻抗近似法求得了氣體軸承的動態(tài)剛度和阻尼系數(shù),通過與偏導數(shù)法的計算結(jié)果對比,阻抗近似法得到了相似的結(jié)果,并且具有較好的精度。在此基礎(chǔ)上,建立了氣體軸承-轉(zhuǎn)子系統(tǒng)的振動微分方程,計算得到了轉(zhuǎn)子的固有頻率與臨界轉(zhuǎn)速。本文的研究可為氣體軸承-轉(zhuǎn)子系統(tǒng)的優(yōu)化設(shè)計提供理論參考,同時為氣體軸承-轉(zhuǎn)子系統(tǒng)的穩(wěn)定性判定提供依據(jù)。
[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.
【學位授予單位】：西安理工大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：TH133.3

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本文編號：2354331