發(fā)布時間：2018-07-17 03:25

【摘要】：碰摩問題主要指轉(zhuǎn)子和靜軸之間的碰撞摩擦引起的系統(tǒng)失穩(wěn)或者故障，對于具有線性剛度的碰摩問題，已經(jīng)有很多的學者做了研宄，但是，隨著現(xiàn)代工業(yè)的快速發(fā)展，其動力學行為也越來越趨于復雜化，用線性化理論已經(jīng)無法解釋轉(zhuǎn)子的各種動力學現(xiàn)象。國內(nèi)外學者開始著手研宄碰摩轉(zhuǎn)子系統(tǒng)的非線性動力學行為，這樣就促使非線性理論在轉(zhuǎn)子動力學方面的極大發(fā)展。 轉(zhuǎn)子的穩(wěn)定性始終是動力學研宄的重點，，為了比較淺顯的解釋碰摩轉(zhuǎn)子的動力學行為，本文在只考慮碰摩條件下，分析頻率比、剛度比，阻尼因數(shù)以及偏心量對轉(zhuǎn)子響應(yīng)的影響；另外對碰摩系統(tǒng)在油膜力作用下的動力學行為也進行了研宄，對于非對稱油膜力作用下碰摩系統(tǒng)的動力學行為也進行了探討分析，文章主要采用的方法是對微分方程無量綱化，進而應(yīng)用數(shù)值模擬的方法，對碰摩系統(tǒng)的分岔圖、時域圖、龐加萊映射圖等進行了較為詳細的分析，解釋了非線性特性產(chǎn)生的原因，為更深入研宄碰摩轉(zhuǎn)子系統(tǒng)提供了依據(jù)。 最后，總結(jié)文章所做主要的工作，提出研宄過程中存在的問題和不足，為今后能夠更好地研宄碰摩轉(zhuǎn)子系統(tǒng)提供研宄方向。
[Abstract]:The rub-impact problem mainly refers to the system instability or failure caused by the collision and friction between the rotor and the static shaft. For the rub-impact problem with linear stiffness, many scholars have studied it, but with the rapid development of modern industry, The dynamic behavior of the rotor becomes more and more complicated, and the linearization theory can not explain the dynamic phenomena of the rotor. Scholars at home and abroad have begun to study the nonlinear dynamic behavior of rub-impact rotor system, which promotes the development of nonlinear theory in rotor dynamics. The stability of rotor is always the focus of dynamic research. In order to explain the dynamic behavior of rub-impact rotor simply, the frequency ratio and stiffness ratio are analyzed under the condition of only considering rub-impact. The effects of damping factor and eccentricity on rotor response, the dynamic behavior of rub-impact system under the action of oil film force, and the dynamic behavior of rub-impact system under asymmetric oil film force are also studied. The main method of this paper is dimensionless differential equation, and then the numerical simulation method is used to analyze the bifurcation diagram, time-domain diagram and Poincare map of rub-impact system in detail. The causes of nonlinear characteristics are explained, which provides a basis for further study of rub-impact rotor systems. Finally, the main work of the paper is summarized, and the problems and shortcomings in the research process are put forward, which can provide a research direction for the better research of rub-impact rotor system in the future.
【學位授予單位】：蘭州交通大學
【學位級別】：碩士
【學位授予年份】：2013
【分類號】：TH113;O415.5

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