本文選題：軸承-轉(zhuǎn)子系統(tǒng) + 非線性液膜力�。� 參考：《天津大學(xué)》2012年碩士論文

【摘要】：隨著科學(xué)技術(shù)的不斷進(jìn)步,高速高精密機(jī)床作為一個(gè)國(guó)家科學(xué)技術(shù)進(jìn)步的標(biāo)志,越來(lái)越多的受到各個(gè)國(guó)家的關(guān)注。對(duì)于高速高精密機(jī)床不僅要求機(jī)床主軸能夠保證穩(wěn)定的高速運(yùn)轉(zhuǎn),而且要保證極小的跳動(dòng)和回轉(zhuǎn)誤差�？紤]到主軸高速運(yùn)轉(zhuǎn)時(shí)的各種非線性因素,如非線性液膜力、氣流力、密封力等,對(duì)主軸系統(tǒng)進(jìn)行非線性動(dòng)力學(xué)分析是必不可少的。機(jī)床主軸系統(tǒng)可歸結(jié)為一類軸承-轉(zhuǎn)子系統(tǒng)。上述因素中以非線性液膜力的影響最為突出,因此有必要研究非線性液膜力作用下的軸承-轉(zhuǎn)子系統(tǒng)非線性動(dòng)力學(xué)行為。 實(shí)際應(yīng)用中,人們會(huì)在潤(rùn)滑劑中添加一些添加劑來(lái)改善潤(rùn)滑特性,而此時(shí)的潤(rùn)滑劑就不能再簡(jiǎn)單的看作是牛頓流體,而應(yīng)當(dāng)以非牛頓流體來(lái)研究。目前,對(duì)軸承-轉(zhuǎn)子系統(tǒng)非線性動(dòng)力學(xué)特性的研究多局限于牛頓流體潤(rùn)滑,而對(duì)于非牛頓流體潤(rùn)滑的軸承-轉(zhuǎn)子系統(tǒng)非線性動(dòng)力學(xué)特性的研究較少。本文應(yīng)用非線性動(dòng)力學(xué)的基本理論和研究方法,研究了非線性支撐情況下的偶應(yīng)力流體潤(rùn)滑軸承-轉(zhuǎn)子系統(tǒng)非線性動(dòng)力學(xué)特性。論文工作主要分以下幾個(gè)方面: 1.對(duì)高精密機(jī)床主軸的研究進(jìn)展,水潤(rùn)滑技術(shù)研究現(xiàn)狀,偶應(yīng)力流體研究現(xiàn)狀及非線性動(dòng)力系統(tǒng)的相關(guān)概念與常用的研究方法等進(jìn)行綜述; 2.推導(dǎo)出偶應(yīng)力流體潤(rùn)滑情況下的液膜力模型,并在此基礎(chǔ)上建立了非線性支撐情況下的軸承-轉(zhuǎn)子系統(tǒng)運(yùn)動(dòng)微分方程。 3.利用數(shù)值方法求出系統(tǒng)在不同參數(shù)情況下的分岔圖、時(shí)間歷程圖、相圖、Poincare映射圖、頻譜圖等特征圖形。結(jié)果表明,非線性支撐能夠更好地抑制系統(tǒng)分岔失穩(wěn);偶應(yīng)力流體的分子特征長(zhǎng)度對(duì)于系統(tǒng)動(dòng)力學(xué)特性具有顯著的影響,隨著分子特征長(zhǎng)度的增大系統(tǒng)臨界轉(zhuǎn)速變小,振動(dòng)幅值也隨之變小。 4.分析了潤(rùn)滑劑粘度、半徑間隙和主軸剛度對(duì)于系統(tǒng)動(dòng)力學(xué)特性的影響。結(jié)果表明,潤(rùn)滑劑粘度、半徑間隙和主軸剛度對(duì)系統(tǒng)動(dòng)力學(xué)都有著明顯的影響。 通過(guò)本文的研究,對(duì)偶應(yīng)力流體潤(rùn)滑情況下的軸承-轉(zhuǎn)子系統(tǒng)的非線性動(dòng)力學(xué)特性有了一定的認(rèn)識(shí),研究結(jié)果為主軸系統(tǒng)的設(shè)計(jì)提供了一定的依據(jù)。
[Abstract]:With the development of science and technology, high-speed and high-precision machine tools, as a symbol of the progress of science and technology in a country, are paid more and more attention by various countries. For high speed and high precision machine tool, not only the spindle of machine tool can be guaranteed to run at high speed, but also the minimum runout and rotation error should be guaranteed. Considering all kinds of nonlinear factors, such as nonlinear liquid membrane force, airflow force and sealing force, it is necessary to analyze the nonlinear dynamics of the spindle system at high speed. Machine tool spindle system can be reduced to a kind of bearing-rotor system. Among the above factors, the nonlinear liquid membrane force is the most important factor, so it is necessary to study the nonlinear dynamic behavior of the bearing-rotor system under the nonlinear liquid membrane force. In practical application, some additives will be added to the lubricant to improve the lubricating properties. However, the lubricant can no longer be regarded as a Newtonian fluid, but should be studied with a non-Newtonian fluid. At present, the research on the nonlinear dynamic characteristics of bearing-rotor system is limited to Newtonian fluid lubrication, but the study of non-Newtonian fluid lubrication of bearing-rotor system nonlinear dynamic characteristics is less. In this paper, the nonlinear dynamic characteristics of the bearing-rotor system under the condition of nonlinear support are studied by using the basic theory and research method of nonlinear dynamics. The work of the thesis is divided into the following aspects: 1. The research progress of high precision machine tool spindle, the research status of water lubrication technology, the research status of couple stress fluid, the related concepts and common research methods of nonlinear dynamic system are summarized. 2. The liquid film force model under the condition of couple stress fluid lubrication is derived, and the differential equation of motion of the bearing-rotor system under the condition of nonlinear support is established. 3. The bifurcation diagram, time history diagram, phase diagram Poincare map and spectrum diagram of the system under different parameters are obtained by numerical method. The results show that the nonlinear bracing can better restrain the bifurcation instability of the system, and the molecular characteristic length of the coupling stress fluid has a significant effect on the dynamic characteristics of the system, and the critical speed of the system becomes smaller with the increase of the molecular characteristic length. The vibration amplitude also becomes smaller. 4. The effects of lubricant viscosity, radius clearance and spindle stiffness on the dynamic characteristics of the system were analyzed. The results show that the viscosity of lubricant, radius clearance and spindle stiffness have obvious effects on system dynamics. Through the research in this paper, the nonlinear dynamic characteristics of the bearing-rotor system under the condition of dual stress fluid lubrication have been recognized to a certain extent, and the research results have provided a certain basis for the design of the spindle system.
【學(xué)位授予單位】：天津大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2012
【分類號(hào)】：TH113

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