本文選題：磁懸浮軸承 + 轉(zhuǎn)子跌落�。� 參考：《南京航空航天大學(xué)》2012年碩士論文

【摘要】：建立了轉(zhuǎn)子跌落在保護(hù)軸承上全過程的動力學(xué)方程，得到了轉(zhuǎn)子在不同初始條件(θ,θ)下跌落后的運(yùn)動相圖，討論了不同滑動摩擦系數(shù)和保護(hù)間隙對轉(zhuǎn)子跌落后運(yùn)動軌跡的影響。基于Hertz接觸理論，建立了轉(zhuǎn)子跌落在保護(hù)軸承上的非線性碰撞力模型，使碰撞力模型更加接近真實(shí)情況下的碰撞力。提出了轉(zhuǎn)子跌落在保護(hù)軸承上的碰撞力測量方案，并設(shè)計(jì)了碰撞力測量裝置，將整個(gè)測量過程分為標(biāo)定和測量兩個(gè)步驟，考慮到碰撞力測量裝置的非線性影響，運(yùn)用沖擊力錘分別在不同大小的沖擊力下對碰撞力測量裝置進(jìn)行了標(biāo)定，然后由轉(zhuǎn)子跌落后支撐環(huán)的振動加速度信號反推碰撞力。 對不同初始轉(zhuǎn)速下轉(zhuǎn)子跌落在保護(hù)軸承上的碰撞力進(jìn)行了試驗(yàn)研究，得到了轉(zhuǎn)子跌落后支撐環(huán)的振動加速度信號、轉(zhuǎn)子軸心軌跡和跌落持續(xù)時(shí)間。試驗(yàn)結(jié)果表明：初始轉(zhuǎn)速越高，轉(zhuǎn)子跌落后保護(hù)軸承受到的振動沖擊越大，跌落持續(xù)時(shí)間越長，越容易出現(xiàn)渦動現(xiàn)象。轉(zhuǎn)子跌落后0.1s范圍內(nèi)，保護(hù)軸承受到的振動和沖擊達(dá)到最大值，但并非出現(xiàn)在初次碰撞時(shí)。以轉(zhuǎn)子初始轉(zhuǎn)速為4500r/min的跌落試驗(yàn)為例，給出了轉(zhuǎn)子跌落在保護(hù)軸承上的碰撞力試驗(yàn)測量和結(jié)果處理的詳細(xì)分析過程，，并得到了該初始轉(zhuǎn)速下轉(zhuǎn)子跌落在保護(hù)軸承上的初次碰撞力和最大恢復(fù)力。根據(jù)初次碰撞力的試驗(yàn)結(jié)果對碰撞力模型進(jìn)行了評估，準(zhǔn)確識別出了所建立的非線性碰撞力模型中的等效質(zhì)量me和等效剛度系數(shù)ke。最后通過對國內(nèi)外的研究成果以及本文得出的相關(guān)結(jié)論歸納總結(jié)出了保護(hù)軸承的相關(guān)設(shè)計(jì)準(zhǔn)則。
[Abstract]:The dynamic equation of rotor falling on protective bearing is established, and the motion phase diagram of rotor falling behind in different initial conditions (胃, 胃) is obtained. The influence of different sliding friction coefficient and protection clearance on the motion track of rotor after falling is discussed.Based on the Hertz contact theory, the nonlinear collision force model of rotor dropping on the protective bearing is established, which makes the collision force model more close to the real impact force.In this paper, a scheme for measuring the impact force of a rotor falling on a protective bearing is proposed, and a collision force measuring device is designed. The whole measurement process is divided into two steps: calibration and measurement, taking into account the nonlinear effect of the impact force measuring device.The impact force measurement device was calibrated under different impact forces by using impact force hammer, and then the impact force was pushed back by the vibration acceleration signal of the supporting ring after the rotor fell.The impact force of the rotor dropping on the protective bearing at different initial speeds was experimentally studied. The vibration acceleration signal of the supporting ring after the rotor drop, the rotor axis trajectory and the drop duration were obtained.The experimental results show that the higher the initial rotational speed, the greater the vibration shock of the protection bearing after the rotor falls, the longer the drop duration, the more likely to appear the vortex phenomenon.In the range of 0.1 s after the rotor falls, the vibration and impact of the protection bearing reach the maximum value, but not during the initial collision.Taking the drop test of rotor with initial speed of 4500r/min as an example, the process of measuring the impact force and processing the result of the rotor drop on the protective bearing is given in detail.The initial impact force and the maximum recovery force of the rotor drop on the protective bearing at the initial speed are obtained.According to the experimental results of the initial collision force, the impact force model is evaluated, and the equivalent mass me and the equivalent stiffness coefficient kee of the established nonlinear collision force model are accurately identified.Finally, through the research results at home and abroad and the relevant conclusions of this paper summarized the relevant design criteria of protective bearings.
【學(xué)位授予單位】：南京航空航天大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2012
【分類號】：TH113

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