本文選題：人字槽軸承　切入點(diǎn)：有限差分法　出處：《天津大學(xué)》2012年碩士論文　論文類型：學(xué)位論文

【摘要】：隨著工業(yè)的現(xiàn)代化進(jìn)程,旋轉(zhuǎn)機(jī)械越來(lái)越向高速度和大功率發(fā)展,對(duì)于軸承的性能要求也越來(lái)越高。軸承結(jié)構(gòu)是決定軸承性能的關(guān)鍵因素。螺旋槽軸承作為一種新型軸承,能有效改善軸承動(dòng)特性和熱特性。近年來(lái),人字型的螺旋槽軸承的實(shí)際應(yīng)用尤為廣泛。本文針對(duì)人字槽徑向動(dòng)壓滑動(dòng)軸承進(jìn)行數(shù)值分析,對(duì)其靜特性和動(dòng)特性進(jìn)行深入研究,并建立了轉(zhuǎn)子-軸承系統(tǒng),對(duì)系統(tǒng)進(jìn)行穩(wěn)定性和動(dòng)力學(xué)分析,為螺旋槽軸承-轉(zhuǎn)子系統(tǒng)的設(shè)計(jì)提供了依據(jù)。論文主要工作如下: 1.采用有限差分法對(duì)雷諾方程進(jìn)行求解,計(jì)算人字槽徑向動(dòng)壓軸承的靜態(tài)特性,并分析了人字槽軸承偏心率、螺旋角、深度、槽數(shù)、軸承寬徑比和轉(zhuǎn)速等參數(shù)變化對(duì)人字槽軸承靜態(tài)特性的影響。結(jié)果表明人字槽軸承具有更好的穩(wěn)定性,但承載力較普通軸承有所降低。 2.利用壓力擾動(dòng)法求解非定常雷諾方程。利用局部積分得到斜坐標(biāo)系下雷諾方程的差分形式,解得擾動(dòng)壓力并積分求得人字槽軸承的剛度和阻尼系數(shù),分析了結(jié)構(gòu)和工況參數(shù)對(duì)動(dòng)特性的影響規(guī)律。 3.分別求解了普通軸承和人字槽軸承支承的單圓盤彈性轉(zhuǎn)子系統(tǒng)的失穩(wěn)轉(zhuǎn)速,得到了結(jié)構(gòu)參數(shù)對(duì)失穩(wěn)轉(zhuǎn)速的影響規(guī)律,并對(duì)不同結(jié)構(gòu)軸承的穩(wěn)定性進(jìn)行了對(duì)比分析。結(jié)果表明人字槽軸承-轉(zhuǎn)子系統(tǒng)穩(wěn)定性更好,可以通過(guò)改變軸承結(jié)構(gòu)參數(shù)提高整個(gè)系統(tǒng)穩(wěn)定性。同時(shí),分析求解了單圓盤軸承-轉(zhuǎn)子系統(tǒng)的臨界轉(zhuǎn)速與不平衡響應(yīng)。
[Abstract]:With the modernization of industry, rotating machinery is developing to high speed and high power, and the performance requirement of bearing is higher and higher. The structure of bearing is the key factor to determine the performance of bearing. As a new type of bearing, spiral groove bearing is a new type of bearing. It can effectively improve the dynamic and thermal characteristics of bearings. In recent years, the practical application of herringbone spiral groove bearings is particularly extensive. In this paper, numerical analysis of herringbone groove radial dynamic sliding bearings is carried out, and its static and dynamic characteristics are deeply studied. The rotor-bearing system is established, and the stability and dynamics of the system are analyzed, which provides the basis for the design of the bearing-rotor system with spiral grooves. The main work of this paper is as follows:. 1. The Reynolds equation is solved by the finite difference method, the static characteristics of the herringbone groove radial dynamic bearing are calculated, and the eccentricity, spiral angle, depth, slot number of the herringbone groove bearing are analyzed. The results show that the herringbone groove bearing has better stability, but its bearing capacity is lower than that of common bearing. 2. The unsteady Reynolds equation is solved by the pressure perturbation method. The difference form of the Reynolds equation in oblique coordinate system is obtained by using the local integral. The disturbance pressure is solved and the stiffness and damping coefficient of the herringbone groove bearing are obtained by integral. The influence of structure and operating parameters on dynamic characteristics is analyzed. 3. The instability speed of single disk elastic rotor system supported by ordinary bearing and herringbone groove bearing is solved, and the influence of structural parameters on instability speed is obtained. The stability of bearings with different structures is compared and analyzed. The results show that the stability of the bearing rotor system with herringbone groove is better, and the stability of the whole system can be improved by changing the structural parameters of the bearing. The critical speed and unbalance response of a single disk bearing-rotor system are analyzed and solved.
【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)】：TH113.22

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