本文選題：非線性振動　切入點：轉子動力學　出處：《振動與沖擊》2016年09期 　論文類型：期刊論文

【摘要】：基于非線性動力學和轉子動力學理論,綜合考慮Muszynska非線性汽封力、非線性油膜力和轉子不平衡量的耦合作用,建立了雙葉輪-軸承交錯布置的復雜轉子-軸承-汽封系統(tǒng)動力學模型。采用有限元法(FEM)推導系統(tǒng)運動微分方程,編程計算了系統(tǒng)轉速、圓盤偏心量、汽封長度和汽封間隙等參數對系統(tǒng)動力特性的影響,并利用分岔圖、頻譜圖、相軌跡和Poincare映射圖表征了系統(tǒng)的運動性態(tài)。研究表明:耦合系統(tǒng)具有高度非線性,隨著參數的變化系統(tǒng)呈現(xiàn)出周期運動、倍周期運動、準周期運動和混沌運動等復雜動力學行為。通過減小圓盤偏心,增加系統(tǒng)汽封長度,選取合適的汽封間隙有利于提高轉子-軸承-汽封系統(tǒng)的穩(wěn)定性,改善系統(tǒng)的運動特性。
[Abstract]:Based on the theory of nonlinear dynamics and rotor dynamics, the coupling of Muszynska nonlinear vapor sealing force, nonlinear oil film force and rotor unbalance is considered synthetically. The dynamic model of complex rotor-bearing-steam seal system with double impeller and bearing staggered arrangement is established. The differential equation of motion of the system is derived by using the finite element method (FEM), and the system rotational speed and disk eccentricity are calculated by programming. The dynamic behavior of the system is characterized by bifurcation diagram, spectrum diagram, phase trajectory and Poincare map. The results show that the coupled system is highly nonlinear. With the change of parameters, the system presents complex dynamic behaviors such as periodic motion, periodic motion, quasi-periodic motion and chaotic motion. By reducing the eccentric of the disk, the length of the steam seal of the system is increased. Selecting proper steam seal clearance can improve the stability of rotor-bearing-steam seal system and improve the system motion characteristics.
【作者單位】： 浙江大學熱工與動力系統(tǒng)研究所;浙江大學機械設計研究所;
【基金】：國家自然科學基金資助項目(51305392) 浙江省重大科技專項(2013C01150)
【分類號】：TH113.1
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本文編號：1594389