【摘要】：滾動軸承是旋轉(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)械對于軸承的要求也越來越高。因此盡早的對滾動軸承進(jìn)行狀態(tài)監(jiān)測和故障診斷,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)防由于滾動軸承突然失效而造成的災(zāi)難性事故,對軸承狀態(tài)監(jiān)測和維護(hù)有重要的意義。1本文主要研究的內(nèi)容包括:(1)建立了滾動軸承局部缺陷位移激勵動力學(xué)模型。以裂紋為滾動軸承局部缺陷研究對象,將局部缺陷形貌特征簡化為矩形;基于Hertz接觸理論建立滾動軸承系統(tǒng)局部缺陷位移激勵的二自由度動力學(xué)模型,對滾動軸承局部缺陷振動響應(yīng)進(jìn)行分析。(2)研究了彈流潤滑對滾動軸承振動響應(yīng)的影響作用�；跐L動軸承接觸力學(xué)模型并引入彈流潤滑,利用四階龍格——庫塔方法對所建模型動力學(xué)方程進(jìn)行求解,并獲得彈流潤滑作用下滾動軸承局部缺陷激勵模擬振動信號;通過實(shí)驗(yàn)獲得試驗(yàn)信號,將模擬信號與試驗(yàn)信號相對比,驗(yàn)證所建模型的正確性。研究表明:潤滑液對滾動軸承的振動有抑制的作用。(3)研究了滾動體滑動與軸承座對于滾動軸承振動響應(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體滑動與用接觸剛度表示的軸承座,利用四階——龍格庫塔方法來獲得振動響應(yīng)。通過對振動信號的分析表明:滾動體滑動與軸承座剛度都會使振動信號幅值增大,加速軸承損壞。(4)研究了不同工作條件對滾動軸承振動響應(yīng)的影響作用。通過研究所建的模型在不同缺陷大小、滾動軸承轉(zhuǎn)速及外載荷條件下的振動信號,將同一狀態(tài)不同條件下振動響應(yīng)信號對比分析。研究表明:隨著缺陷尺寸、滾動軸承轉(zhuǎn)速和外加載荷增大,滾動軸承的振動響應(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)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TH133.33

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