本文選題：氣體靜壓軸承-轉(zhuǎn)子系統(tǒng)　切入點(diǎn)：剛度　出處：《大連海事大學(xué)》2011年碩士論文

【摘要】：氣體靜壓電主軸具有轉(zhuǎn)速高、精度高、無(wú)污染等優(yōu)點(diǎn),在高精數(shù)控機(jī)床上有廣闊的應(yīng)用前景。目前隨著轉(zhuǎn)速的提升,氣膜引起的動(dòng)態(tài)非線性因素極大地影響著氣體靜壓軸承—轉(zhuǎn)子系統(tǒng)轉(zhuǎn)速的提升,但是經(jīng)典轉(zhuǎn)子動(dòng)力學(xué)理論是基于支承是靜態(tài)線性的觀點(diǎn)建立的,這-矛盾導(dǎo)致經(jīng)典轉(zhuǎn)子動(dòng)力學(xué)理論無(wú)法滿足氣體靜壓軸承—轉(zhuǎn)子系統(tǒng)的研究需求。 本文以氣體靜壓電主軸的主體部分——?dú)怏w靜壓軸承—轉(zhuǎn)子系統(tǒng)為研究對(duì)象,針對(duì)氣體靜壓軸承的流場(chǎng)計(jì)算、氣體靜壓軸承—轉(zhuǎn)子系統(tǒng)的理論計(jì)算、實(shí)驗(yàn)臺(tái)的設(shè)計(jì)搭建與驗(yàn)證等方面開展了深入的研究,主要研究?jī)?nèi)容包括： 以氣體靜壓軸承為研究對(duì)象,采用基于N-S方程的有限體積法中的層流模型對(duì)靜壓氣體軸承的流場(chǎng)進(jìn)行計(jì)算,基于仿真計(jì)算的結(jié)果,求解得到了軸承的剛度特性參數(shù)。 針對(duì)氣膜的動(dòng)態(tài)非線性的特點(diǎn),基于經(jīng)典轉(zhuǎn)子動(dòng)力學(xué)理論,提出了氣體靜壓軸承—轉(zhuǎn)子系統(tǒng)臨界轉(zhuǎn)速的有限元計(jì)算方案。該計(jì)算方案通過(guò)預(yù)估臨界轉(zhuǎn)速值,使待解的頻率方程中的各項(xiàng)參數(shù)盡可能接近實(shí)際工況下系統(tǒng)通過(guò)臨界轉(zhuǎn)速值時(shí)反映到頻率方程中的各項(xiàng)參數(shù)。將該方案應(yīng)用于氣體靜壓軸承—轉(zhuǎn)子系統(tǒng)實(shí)驗(yàn)臺(tái),理論和實(shí)驗(yàn)結(jié)果對(duì)比表明,一、二階臨界轉(zhuǎn)速的理論計(jì)算值與實(shí)驗(yàn)測(cè)量值誤差在10%以內(nèi),所提出的計(jì)算方案具有較高的計(jì)算精度。 基于所提出的計(jì)算方案,設(shè)計(jì)并搭建了氣體靜壓球面軸承—轉(zhuǎn)子系統(tǒng)實(shí)驗(yàn)臺(tái),將氣體靜壓球面軸承應(yīng)用到高速旋轉(zhuǎn)機(jī)械上。實(shí)驗(yàn)結(jié)果表明,實(shí)驗(yàn)臺(tái)可以順利通過(guò)二階臨界轉(zhuǎn)速,但臨界轉(zhuǎn)速的實(shí)驗(yàn)測(cè)量值與設(shè)計(jì)值誤差較大,經(jīng)分析認(rèn)為造成誤差的主要原因是加工精度偏低、軸向因素的影響、設(shè)計(jì)工況與實(shí)際工況間的偏差等。
[Abstract]:With the advantages of high rotational speed, high precision and no pollution, the pneumatic hydrostatic spindle has a broad application prospect in high precision CNC machine tools. At present, with the increase of rotational speed, The dynamic nonlinear factors caused by gas film greatly affect the speed increase of the aerostatic bearing-rotor system, but the classical rotor dynamics theory is based on the view that the support is static linear. Because of this contradiction, the classical rotor dynamics theory can not meet the research needs of gas static bearing- rotor system. In this paper, the main part of the pneumatic hydrostatic spindle-gas hydrostatic bearing- rotor system is taken as the research object, aiming at the calculation of the flow field of the gas hydrostatic bearing and the theoretical calculation of the gas hydrostatic bearing-rotor system. The design, construction and verification of the experimental platform are studied in depth. The main research contents are as follows:. The laminar flow model in the finite volume method based on N-S equation is used to calculate the flow field of the hydrostatic bearing. Based on the results of simulation, the stiffness parameters of the bearing are obtained. Based on the classical rotor dynamics theory, a finite element method for calculating the critical speed of a gas hydrostatic bearing-rotor system is proposed, which is based on the dynamic nonlinearity of the film. The parameters in the unsolved frequency equation are as close as possible to those reflected in the frequency equation when the system passes through the critical rotational speed under the actual operating conditions. The scheme is applied to the aerostatic bearing-rotor system test bench. The comparison between the theoretical and experimental results shows that the error between the theoretical and experimental values of the second order critical rotational speed is less than 10%, and the proposed scheme has a high accuracy. Based on the proposed calculation scheme, an experimental platform for aerostatic spherical bearing-rotor system is designed and built. The pneumatic hydrostatic spherical bearing is applied to high-speed rotating machinery. The experimental results show that, The test table can pass through the second order critical speed smoothly, but the error between the experimental measurement value and the design value of the critical speed is large. It is considered that the main cause of the error is the low machining precision and the influence of axial factors. The deviation between design conditions and actual working conditions.
【學(xué)位授予單位】：大連海事大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2011
【分類號(hào)】：TH133.36

【引證文獻(xiàn)】

相關(guān)博士學(xué)位論文 前1條

1 王偉然;直接轉(zhuǎn)矩控制在無(wú)軸承無(wú)刷直流電機(jī)中的應(yīng)用[D];江蘇大學(xué);2012年

相關(guān)碩士學(xué)位論文 前1條

1 黃鑫;數(shù)控銑床高速電主軸結(jié)構(gòu)設(shè)計(jì)及特性研究[D];大連海事大學(xué);2013年

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本文編號(hào)：1667026