本文選題：可傾瓦滑動(dòng)軸承 + 轉(zhuǎn)子系統(tǒng)　； 參考：《華東理工大學(xué)》2017年碩士論文

【摘要】：可傾瓦滑動(dòng)軸承廣泛應(yīng)用于各種高速旋轉(zhuǎn)機(jī)械中,軸承的運(yùn)動(dòng)狀態(tài)對(duì)旋轉(zhuǎn)機(jī)械的穩(wěn)定性起著至關(guān)重要的作用。研究軸承和轉(zhuǎn)子參數(shù)對(duì)可傾瓦軸承—轉(zhuǎn)子系統(tǒng)穩(wěn)定性的影響,對(duì)于軸承的結(jié)構(gòu)優(yōu)化設(shè)計(jì)以及轉(zhuǎn)子系統(tǒng)的故障診斷都具有較為重要的理論意義和工程價(jià)值。本文在滑動(dòng)軸承動(dòng)態(tài)雷諾方程的基礎(chǔ)上,基于軸向壓力拋物線分布假設(shè),得到簡(jiǎn)化的一維動(dòng)態(tài)雷諾方程。在充分考慮可傾瓦滑動(dòng)軸承瓦塊擺動(dòng)以及結(jié)構(gòu)參數(shù)的基礎(chǔ)上,采用有限差分法對(duì)可傾瓦滑動(dòng)軸承一維動(dòng)態(tài)雷諾方程做了離散處理并用雷諾方程邊界條件定解,通過MATLAB進(jìn)行編程計(jì)算,得到油膜力。根據(jù)各瓦塊相互之間的位置姿態(tài),利用歐拉方法求解軸心軌跡,分析軸頸轉(zhuǎn)速,軸承半徑間隙,瓦塊數(shù)目對(duì)穩(wěn)定性的影響。通過分析發(fā)現(xiàn):軸心渦動(dòng)幅值和各個(gè)瓦塊的最大壓強(qiáng)隨著軸頸轉(zhuǎn)速的提高而增大,并且在靠近極限轉(zhuǎn)速時(shí),最大壓強(qiáng)會(huì)迅速增大;而減小軸承半徑間隙和增加瓦數(shù)都能使轉(zhuǎn)子系統(tǒng)的極限轉(zhuǎn)速值增大,但是瓦數(shù)增加也會(huì)使軸心渦動(dòng)幅值增加。因此,在設(shè)計(jì)和安裝軸承時(shí),要選擇適合的半徑間隙及瓦數(shù)以適應(yīng)系統(tǒng)轉(zhuǎn)速和穩(wěn)定性的要求。結(jié)合實(shí)際離心式壓縮機(jī)轉(zhuǎn)子,通過建立其集總參數(shù)模型,利用Raccati傳遞矩陣求解該轉(zhuǎn)子系統(tǒng)的臨界轉(zhuǎn)速和不平衡響應(yīng),并探討不同支承參數(shù)對(duì)臨界轉(zhuǎn)速的影響規(guī)律,為轉(zhuǎn)子系統(tǒng)的結(jié)構(gòu)優(yōu)化設(shè)計(jì)提供參考。
[Abstract]:Tilting pad sliding bearings are widely used in various high speed rotating machinery. The motion state of the bearings plays an important role in the stability of rotating machinery. The study of the influence of bearing and rotor parameters on the stability of tilting bearing rotor system is of great theoretical significance and engineering value for the optimum design of bearing structure and the fault diagnosis of rotor system. Based on the dynamic Reynolds equation of sliding bearing and the assumption of axial pressure parabola distribution, a simplified one-dimensional dynamic Reynolds equation is obtained in this paper. On the basis of fully considering the swinging of tilting pad sliding bearing and the structural parameters, the one-dimensional dynamic Reynolds equation of tilting pad sliding bearing is discretized by the finite difference method and the solution is determined by the Reynolds equation boundary condition. Through MATLAB programming calculation, the oil film force is obtained. According to the position and attitude of each tile, the influence of journal speed, bearing radius clearance and the number of tiles on the stability is analyzed by Euler method. It is found that the axial vortex amplitude and the maximum pressure of each tile increase with the increase of the rotating speed of the shaft neck, and the maximum pressure increases rapidly near the limit speed. The limit rotational speed of the rotor system can be increased by decreasing the radius clearance of the bearing and increasing the number of the bush, but the amplitude of the axial vortex will also be increased by the increase of the number of the bearing. Therefore, in the design and installation of bearings, the appropriate radius clearance and the number of tiles should be selected to meet the system speed and stability requirements. Combined with the actual centrifugal compressor rotor, by establishing its lumped parameter model, the critical speed and unbalance response of the rotor system are solved by Raccati transfer matrix, and the influence of different supporting parameters on the critical speed is discussed. It provides a reference for the structure optimization design of rotor system.
【學(xué)位授予單位】：華東理工大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TH133.31

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本文編號(hào)：2118557