【摘要】：滾動(dòng)軸承是旋轉(zhuǎn)機(jī)械中廣泛應(yīng)用的重要部件,隨著科技不斷發(fā)展,旋轉(zhuǎn)機(jī)械對(duì)于軸承的要求也越來(lái)越高。因此盡早的對(duì)滾動(dòng)軸承進(jìn)行狀態(tài)監(jiān)測(cè)和故障診斷,有助于提高機(jī)械設(shè)備的精確度和穩(wěn)定性;并且能夠預(yù)防由于滾動(dòng)軸承突然失效而造成的災(zāi)難性事故,對(duì)軸承狀態(tài)監(jiān)測(cè)和維護(hù)有重要的意義。1本文主要研究的內(nèi)容包括:(1)建立了滾動(dòng)軸承局部缺陷位移激勵(lì)動(dòng)力學(xué)模型。以裂紋為滾動(dòng)軸承局部缺陷研究對(duì)象,將局部缺陷形貌特征簡(jiǎn)化為矩形;基于Hertz接觸理論建立滾動(dòng)軸承系統(tǒng)局部缺陷位移激勵(lì)的二自由度動(dòng)力學(xué)模型,對(duì)滾動(dòng)軸承局部缺陷振動(dòng)響應(yīng)進(jìn)行分析。(2)研究了彈流潤(rùn)滑對(duì)滾動(dòng)軸承振動(dòng)響應(yīng)的影響作用�；跐L動(dòng)軸承接觸力學(xué)模型并引入彈流潤(rùn)滑,利用四階龍格——庫(kù)塔方法對(duì)所建模型動(dòng)力學(xué)方程進(jìn)行求解,并獲得彈流潤(rùn)滑作用下滾動(dòng)軸承局部缺陷激勵(lì)模擬振動(dòng)信號(hào);通過(guò)實(shí)驗(yàn)獲得試驗(yàn)信號(hào),將模擬信號(hào)與試驗(yàn)信號(hào)相對(duì)比,驗(yàn)證所建模型的正確性。研究表明:潤(rùn)滑液對(duì)滾動(dòng)軸承的振動(dòng)有抑制的作用。(3)研究了滾動(dòng)體滑動(dòng)與軸承座對(duì)于滾動(dòng)軸承振動(dòng)響應(yīng)的影響作用�；谇懊嫠ǖ亩杂啥饶Ｐ�,在此模型的基礎(chǔ)上加入用角位移表示的滾動(dòng)體滑動(dòng)與用接觸剛度表示的軸承座,利用四階——龍格庫(kù)塔方法來(lái)獲得振動(dòng)響應(yīng)。通過(guò)對(duì)振動(dòng)信號(hào)的分析表明:滾動(dòng)體滑動(dòng)與軸承座剛度都會(huì)使振動(dòng)信號(hào)幅值增大,加速軸承損壞。(4)研究了不同工作條件對(duì)滾動(dòng)軸承振動(dòng)響應(yīng)的影響作用。通過(guò)研究所建的模型在不同缺陷大小、滾動(dòng)軸承轉(zhuǎn)速及外載荷條件下的振動(dòng)信號(hào),將同一狀態(tài)不同條件下振動(dòng)響應(yīng)信號(hào)對(duì)比分析。研究表明:隨著缺陷尺寸、滾動(dòng)軸承轉(zhuǎn)速和外加載荷增大,滾動(dòng)軸承的振動(dòng)響應(yīng)幅值增大。
[Abstract]:Rolling bearing is an important component widely used in rotating machinery. With the development of science and technology, the requirement of rotary machinery for bearing is becoming higher and higher. Therefore, it is helpful to improve the accuracy and stability of mechanical equipment by monitoring and fault diagnosis of rolling bearing as soon as possible. And can prevent catastrophic accidents caused by the sudden failure of rolling bearings, The main contents of this paper are as follows: (1) the dynamic model of local defect displacement excitation of rolling bearing is established. Taking the crack as the research object of the local defect of rolling bearing, the feature of the local defect is simplified as a rectangle. Based on the Hertz contact theory, a two-degree-of-freedom dynamic model of local defect displacement excitation of rolling bearing system is established, and the vibration response of local defect of rolling bearing is analyzed. (2) the effect of elastohydrodynamic lubrication on the vibration response of rolling bearing is studied. Based on the contact mechanics model of rolling bearing and elastohydrodynamic lubrication, the dynamic equation of the model is solved by the fourth order Runge-Kutta method, and the simulated vibration signal of local defect excitation of rolling bearing under elastohydrodynamic lubrication is obtained. The experimental signals are obtained and the simulation signals are compared with the experimental signals to verify the correctness of the proposed model. The results show that the lubricating fluid can restrain the vibration of the rolling bearing. (3) the effects of the sliding of the rolling body and the bearing seat on the vibration response of the rolling bearing are studied. Based on the two-degree-of-freedom model established in this paper, the sliding of the rolling body represented by angular displacement and the bearing seat expressed by the contact stiffness are added on the basis of the model, and the vibration response is obtained by using the fourth-order Runge-Kutta method. The analysis of vibration signal shows that both sliding of rolling body and stiffness of bearing seat can increase the amplitude of vibration signal and accelerate bearing damage. (4) the effect of different working conditions on vibration response of rolling bearing is studied. Through the vibration signal of the model under different defect size, rolling bearing speed and external load, the vibration response signals under the same state and different conditions are compared and analyzed. The results show that the vibration response amplitude of the rolling bearing increases with the increase of the size of the defect, the rotational speed and the applied load of the rolling bearing.
【學(xué)位授予單位】：蘭州理工大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TH133.33

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