發(fā)布時(shí)間：2018-05-06 06:28

  本文選題：多孔質(zhì) + 空氣靜壓軸承��； 參考：《工程科學(xué)與技術(shù)》2017年05期

【摘要】：為了有效解決多孔質(zhì)空氣靜壓主軸回轉(zhuǎn)誤差在理論上無(wú)法定量精確求解的難題,提出了一種基于計(jì)算流體力學(xué)和動(dòng)態(tài)網(wǎng)格技術(shù)的回轉(zhuǎn)精度預(yù)測(cè)方法。首先根據(jù)實(shí)驗(yàn)測(cè)量數(shù)據(jù)分析規(guī)律采用頻率和幅值相結(jié)合的方式對(duì)主軸轉(zhuǎn)子的圓度誤差進(jìn)行幾何建模,建立了不同波形、不同幅值下的幾何模型。然后在FLUENT平臺(tái)下利用動(dòng)態(tài)網(wǎng)格技術(shù),并采用瞬態(tài)分析方法同時(shí)求解N-S方程和牛頓運(yùn)動(dòng)定律,研究了不同波形、不同幅值下轉(zhuǎn)子的X/Y向受力、速度分布、壓力分布、位移軌跡的變化規(guī)律,實(shí)現(xiàn)圓度誤差對(duì)回轉(zhuǎn)誤差的影響規(guī)律研究。仿真結(jié)果表明:圓度誤差是影響多孔質(zhì)空氣靜壓主軸回轉(zhuǎn)誤差的主要因素,回轉(zhuǎn)誤差隨著誤差幅值的增加而顯著惡化,偶波造成的回轉(zhuǎn)誤差明顯低于奇波誤差,隨波數(shù)的增加,回轉(zhuǎn)誤差降低。最后搭建高精度回轉(zhuǎn)誤差測(cè)量實(shí)驗(yàn)平臺(tái),對(duì)自行研制的多孔質(zhì)空氣靜壓主軸回轉(zhuǎn)誤差進(jìn)行測(cè)量,測(cè)得回轉(zhuǎn)誤差為50 nm(其中包含垂直度、圓柱度、圓度等引起的回轉(zhuǎn)誤差),計(jì)算求得的圓度誤差為23 nm占回轉(zhuǎn)誤差的46%,得出圓度誤差是影響主軸回轉(zhuǎn)精度的主要因素,也驗(yàn)證了所采用的回轉(zhuǎn)誤差分析方法的有效性和準(zhǔn)確性。
[Abstract]:In order to effectively solve the problem that the rotation error of porous air static pressure spindle can not be solved accurately and quantitatively in theory, a method for predicting the accuracy of rotation based on computational fluid dynamics and dynamic grid technology is proposed. Firstly, the roundness error of spindle rotor is modeled by the combination of frequency and amplitude according to the law of experimental data analysis, and the geometric models with different waveforms and different amplitudes are established. Then using dynamic grid technology on FLUENT platform and using transient analysis method to solve N-S equation and Newton's law of motion simultaneously, the X / Y direction force, velocity distribution and pressure distribution of rotor with different waveforms and different amplitudes are studied. The influence of roundness error on rotation error is studied. The simulation results show that the roundness error is the main factor affecting the rotation error of the porous air static pressure spindle. The rotation error deteriorates significantly with the increase of the amplitude of the error, and the rotation error caused by even wave is obviously lower than that caused by odd wave, and increases with the increase of wave number. The rotation error is reduced. At last, a high precision experiment platform is built to measure the rotary error of the porous air static pressure spindle. The error is 50 nm (including the vertical degree, the cylinder degree, the vertical degree and the cylinder degree). The roundness error caused by roundness is 46% of the rotation error at 23 nm. It is concluded that roundness error is the main factor affecting the rotation accuracy of the spindle, and the validity and accuracy of the analytical method are verified.
【作者單位】： 電子科技大學(xué)機(jī)械電子工程學(xué)院;中國(guó)工程物理研究院機(jī)械制造工藝研究所;
【基金】：國(guó)家自然科學(xué)基金委員會(huì)與中國(guó)工程物理研究院聯(lián)合基金委員會(huì)資助項(xiàng)目(U1530130)
【分類號(hào)】：TG502.13

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