本文關(guān)鍵詞： 滑動(dòng)軸承轉(zhuǎn)子系統(tǒng) 圓度誤差 穩(wěn)定性 摩擦功率損耗　出處：《廣西工學(xué)院》2012年碩士論文　論文類(lèi)型：學(xué)位論文

【摘要】：滑動(dòng)軸承轉(zhuǎn)子系統(tǒng)的動(dòng)力學(xué)特性以及摩擦功率損耗與系統(tǒng)的結(jié)構(gòu)參數(shù)密切相關(guān)，目前有關(guān)滑動(dòng)軸承轉(zhuǎn)子系統(tǒng)動(dòng)力學(xué)的研究大都以系統(tǒng)的名義尺寸進(jìn)行，并未考慮制造誤差對(duì)系統(tǒng)穩(wěn)定性的影響。實(shí)際上滑動(dòng)軸承結(jié)構(gòu)參數(shù)的各種誤差對(duì)轉(zhuǎn)子系統(tǒng)是有影響的，而轉(zhuǎn)子在加工過(guò)程中的制造誤差也是客觀存在的，因此考慮誤差對(duì)轉(zhuǎn)子系統(tǒng)穩(wěn)定性影響以及摩擦功率損耗的影響研究很有必要。本文主要研究圓度誤差對(duì)滑動(dòng)軸承轉(zhuǎn)子系統(tǒng)摩擦功率損耗的影響。 首先建立普通滑動(dòng)軸承轉(zhuǎn)子系統(tǒng)動(dòng)力學(xué)模型，利用有限差分法求解雷諾方程，得到了油膜壓力以及油膜承載力。介紹了滑動(dòng)軸承轉(zhuǎn)子系統(tǒng)軸心軌跡計(jì)算方法以及臨界轉(zhuǎn)速判定方法，根據(jù)計(jì)算的量綱一運(yùn)行參數(shù)Op得到具備普遍性意義穩(wěn)定性臨界曲線，給出了滑動(dòng)軸承轉(zhuǎn)子系統(tǒng)的摩擦功率損耗曲線。然后，考慮軸承和轉(zhuǎn)子的圓度誤差形狀分別是單凸臺(tái)、橢圓、三凸臺(tái)，將不同圓度誤差的軸承和轉(zhuǎn)子進(jìn)行組合，得到9種圓度誤差形狀不同的滑動(dòng)軸承轉(zhuǎn)子系統(tǒng)，再考慮軸承和轉(zhuǎn)子各有兩種圓度誤差度度，，最后得到36種圓度誤差不同的滑動(dòng)軸承轉(zhuǎn)子系統(tǒng)。運(yùn)用經(jīng)過(guò)驗(yàn)證的理論，得到不同圓度誤差的滑動(dòng)軸承轉(zhuǎn)子系統(tǒng)的穩(wěn)定性臨界曲線和摩擦功率損耗曲線，對(duì)不同圓度誤差系統(tǒng)的兩種曲線進(jìn)行分析，得出相關(guān)結(jié)論。 為驗(yàn)證此理論分析結(jié)果的正確性，課題組專(zhuān)門(mén)搭建了滑動(dòng)軸承轉(zhuǎn)子系統(tǒng)實(shí)驗(yàn)臺(tái)。實(shí)驗(yàn)臺(tái)基于LabVIEW信號(hào)采集系統(tǒng)，可實(shí)現(xiàn)對(duì)轉(zhuǎn)子系統(tǒng)轉(zhuǎn)速、軸心軌跡、頻譜及軸振振幅等信號(hào)的實(shí)時(shí)測(cè)量與保存。扭矩儀可以實(shí)時(shí)監(jiān)測(cè)系統(tǒng)的扭矩、轉(zhuǎn)速以及摩擦功率損耗。為了實(shí)驗(yàn)需要，同時(shí)加工了四根圓度誤差不同的橢圓軸，以驗(yàn)證圓度誤差對(duì)滑動(dòng)軸承轉(zhuǎn)子系統(tǒng)穩(wěn)定性以及摩擦功率損耗的影響。論文的最后通過(guò)實(shí)驗(yàn)驗(yàn)證對(duì)理論結(jié)果進(jìn)行驗(yàn)證，分析比較實(shí)驗(yàn)數(shù)據(jù)后認(rèn)為，實(shí)驗(yàn)結(jié)果與理論計(jì)算結(jié)果相符，并對(duì)誤差進(jìn)行了分析。本文的研究結(jié)果可以為滑動(dòng)軸承轉(zhuǎn)子系統(tǒng)的誤差控制、減少生產(chǎn)成本及降低損耗提供理論參考。
[Abstract]:The dynamic characteristics and friction power loss of sliding bearing rotor system are closely related to the structural parameters of the system. At present, most of the research on the rotor system dynamics of sliding bearing is based on the nominal size of the system. The effect of manufacturing error on the stability of the system is not considered. In fact, the errors of the structural parameters of sliding bearing have an effect on the rotor system, and the manufacturing error of the rotor in the process of machining is also objective. Therefore, it is necessary to study the effect of error on the stability of rotor system and the influence of friction power loss. In this paper, the effect of roundness error on friction power loss of sliding bearing rotor system is studied. Firstly, the rotor system dynamics model of plain bearing is established, and the Reynolds equation is solved by finite difference method. The oil film pressure and the bearing capacity of oil film are obtained. The calculation method of axis track and the method of determining critical speed of sliding bearing rotor system are introduced. According to the calculated dimensional-operation parameter Op, the critical curve of stability with universal meaning is obtained, and the friction power loss curve of the sliding bearing rotor system is given. Then, the friction power loss curve of the sliding bearing rotor system is given. Considering that the roundness error shapes of bearing and rotor are single convex, elliptical and triple convex respectively, the bearing and rotor with different roundness error are combined to obtain nine kinds of journal bearing rotor system with different roundness error shape. Considering that there are two kinds of roundness error degree of bearing and rotor, 36 kinds of sliding bearing rotor system with different roundness error are obtained. The stability critical curve and friction power loss curve of sliding bearing rotor system with different roundness errors are obtained. The two curves of different roundness error system are analyzed and the relevant conclusions are drawn. In order to verify the correctness of the theoretical analysis results, the team built a special sliding bearing rotor system experiment bench, based on the LabVIEW signal acquisition system, the rotor system speed can be realized. Real time measurement and preservation of axis locus, frequency spectrum and vibration amplitude. Torque meter can monitor system torque, rotational speed and friction power loss in real time. At the same time, four elliptical shafts with different roundness errors are machined to verify the influence of roundness error on the stability and friction power loss of sliding bearing rotor system. Finally, the theoretical results are verified by experiments. After analyzing and comparing the experimental data, it is concluded that the experimental results are consistent with the theoretical results, and the errors are analyzed. The research results in this paper can be used to control the errors of the sliding bearing rotor system. To reduce production costs and reduce losses to provide a theoretical reference.
【學(xué)位授予單位】：廣西工學(xué)院
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2012
【分類(lèi)號(hào)】：TH133.33

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