多故障轉子系統(tǒng)的非線性動力學分析與實驗研究
發(fā)布時間：2019-04-02 19:53
【摘要】：轉子系統(tǒng)作為旋轉機械的核心部件,研究其故障狀態(tài)下的非線性行為和動力學特性對理解、控制轉子系統(tǒng)的故障有深遠意義。本文從理論仿真上研究了裂紋、碰摩、油膜失穩(wěn)單故障以及多種故障同時存在的情況,在考慮裂紋時變剛度、碰摩力、非線性油膜力的基礎上,建立了剛性支承和油膜支承的轉子動力學模型,采用龍格庫塔法(Runge-Kutta)求解系統(tǒng)的動力學響應,討論參數變化對系統(tǒng)非線性行為和動力學特性的影響,并分析了裂紋、碰摩、油膜失穩(wěn)之間的相互作用。在實驗研究方面,進行了剛性支承和油膜支承下的多故障轉子系統(tǒng)實驗,與理論仿真結果有較好的對應。通過理論和實驗研究,得到了一些有價值的結論,為轉子系統(tǒng)設計和工程實踐應用提供了重要參考。主要研究內容包括:1.以剛性支承的Jeffcott轉子為研究對象,建立了裂紋故障、碰摩故障以及裂紋-碰摩雙故障的轉子系統(tǒng)模型,采用Runge-Kutta方法進行求解,討論了裂紋深度、動靜剛度比、不平衡對系統(tǒng)動力學響應的影響;2.以油膜支承的雙圓盤轉子為研究對象,在考慮裂紋時變剛度和非線性油膜力的基礎上,建立了轉子系統(tǒng)的動力學模型,使用Runge-Kutta法求解,結合分岔圖、頻譜圖、Poincaré截面圖和三維譜圖等分析了系統(tǒng)的分岔行為和動力學響應,得到裂紋和油膜失穩(wěn)之間的作用規(guī)律;3.以油膜支承的多故障轉子系統(tǒng)為研究對象,基于裂紋時變剛度、碰摩力、非線性油膜力,建立油膜支承下含裂紋-碰摩故障的轉子模型,通過數值方法求解系統(tǒng)響應,借助分岔圖、最大Lyapunov指數(LLE)、頻譜圖、Poincaré截面圖等,討論了轉速、裂紋深度、定子剛度變化對系統(tǒng)響應的影響,獲得了裂紋、碰摩、油膜失穩(wěn)之間的作用規(guī)律;4.在Bently轉子模擬實驗臺上進行了轉子-軸承系統(tǒng)的故障實驗研究。實驗主要包括:剛性支承的正常轉子和裂紋轉子在加入碰摩故障前后的實驗研究,油膜支承的正常轉子和裂紋轉子在加入碰摩故障前后的實驗研究。獲得了各故障形式下的系統(tǒng)響應,驗證了相同模型下的理論仿真結果,對于轉子系統(tǒng)的故障研究具有重要意義。
[Abstract]:As the core component of rotating machinery, the research on nonlinear behavior and dynamic characteristics of rotor system under fault condition is of great significance for understanding and controlling the fault of rotor system. In this paper, the problems of crack, rubbing, oil film instability single fault and multiple faults are studied in theoretical simulation. On the basis of considering the time-varying stiffness, impact force and nonlinear oil film force of crack, this paper studies the problem of crack time-varying stiffness, impact friction force, nonlinear oil film force, and so on. The rotor dynamics models of rigid support and oil film support are established. The dynamic response of the system is solved by means of the Runge Kutta method (Runge-Kutta). The influence of parameter variation on the nonlinear behavior and dynamic characteristics of the system is discussed, and the cracks are analyzed. The interaction between rubbing and oil film instability. In the aspect of experimental research, the experiments of multi-fault rotor system with rigid support and oil film support are carried out, which are in good agreement with the theoretical simulation results. Through theoretical and experimental research, some valuable conclusions are obtained, which provide an important reference for the design and engineering application of rotor system. The main research contents include: 1. Taking the Jeffcott rotor with rigid support as the research object, the rotor system models of crack fault, rub impact fault and crack-friction double fault are established. The crack depth, dynamic-dynamic stiffness ratio are discussed by Runge-Kutta method, and the dynamic-dynamic stiffness ratio of crack depth is discussed, and the dynamic-dynamic stiffness ratio of crack depth is discussed. The influence of imbalance on the dynamic response of the system; 2. On the basis of considering the time-varying stiffness of crack and the nonlinear oil film force, the dynamic model of rotor system is established, which is solved by Runge-Kutta method, and combined with bifurcation diagram and spectrum diagram, the rotor with oil film support is taken as the research object, and the time-varying stiffness of crack and the nonlinear oil film force are taken into account. The bifurcation behavior and dynamic response of the system are analyzed by Poincar茅 section diagram and three-dimensional spectrum, and the law of action between crack and oil film instability is obtained. 3. Taking the multi-fault rotor system with oil film support as the research object, based on the time-varying stiffness of crack, impact force and nonlinear oil film force, the rotor model with crack-impact fault under oil film support is established, and the response of the system is solved by numerical method. With the help of bifurcation diagram, maximum Lyapunov exponent (LLE), spectrum map and Poincare section diagram, the effects of speed, crack depth and stator stiffness on the response of the system are discussed, and the action rules among crack, rubbing and oil film instability are obtained. 4. The fault test of rotor-bearing system is carried out on the Bently rotor simulator. The experiments mainly include the experimental study of the normal rotor with rigid support and the cracked rotor before and after adding rub-impact fault, and the experimental study of the normal rotor with oil-film support and the cracked rotor before and after adding rub-impact fault. The response of the system under various fault forms is obtained, and the theoretical simulation results under the same model are verified. It is of great significance for the fault study of rotor system.
【學位授予單位】：華北電力大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：TH133
本文編號：2452871
[Abstract]:As the core component of rotating machinery, the research on nonlinear behavior and dynamic characteristics of rotor system under fault condition is of great significance for understanding and controlling the fault of rotor system. In this paper, the problems of crack, rubbing, oil film instability single fault and multiple faults are studied in theoretical simulation. On the basis of considering the time-varying stiffness, impact force and nonlinear oil film force of crack, this paper studies the problem of crack time-varying stiffness, impact friction force, nonlinear oil film force, and so on. The rotor dynamics models of rigid support and oil film support are established. The dynamic response of the system is solved by means of the Runge Kutta method (Runge-Kutta). The influence of parameter variation on the nonlinear behavior and dynamic characteristics of the system is discussed, and the cracks are analyzed. The interaction between rubbing and oil film instability. In the aspect of experimental research, the experiments of multi-fault rotor system with rigid support and oil film support are carried out, which are in good agreement with the theoretical simulation results. Through theoretical and experimental research, some valuable conclusions are obtained, which provide an important reference for the design and engineering application of rotor system. The main research contents include: 1. Taking the Jeffcott rotor with rigid support as the research object, the rotor system models of crack fault, rub impact fault and crack-friction double fault are established. The crack depth, dynamic-dynamic stiffness ratio are discussed by Runge-Kutta method, and the dynamic-dynamic stiffness ratio of crack depth is discussed, and the dynamic-dynamic stiffness ratio of crack depth is discussed. The influence of imbalance on the dynamic response of the system; 2. On the basis of considering the time-varying stiffness of crack and the nonlinear oil film force, the dynamic model of rotor system is established, which is solved by Runge-Kutta method, and combined with bifurcation diagram and spectrum diagram, the rotor with oil film support is taken as the research object, and the time-varying stiffness of crack and the nonlinear oil film force are taken into account. The bifurcation behavior and dynamic response of the system are analyzed by Poincar茅 section diagram and three-dimensional spectrum, and the law of action between crack and oil film instability is obtained. 3. Taking the multi-fault rotor system with oil film support as the research object, based on the time-varying stiffness of crack, impact force and nonlinear oil film force, the rotor model with crack-impact fault under oil film support is established, and the response of the system is solved by numerical method. With the help of bifurcation diagram, maximum Lyapunov exponent (LLE), spectrum map and Poincare section diagram, the effects of speed, crack depth and stator stiffness on the response of the system are discussed, and the action rules among crack, rubbing and oil film instability are obtained. 4. The fault test of rotor-bearing system is carried out on the Bently rotor simulator. The experiments mainly include the experimental study of the normal rotor with rigid support and the cracked rotor before and after adding rub-impact fault, and the experimental study of the normal rotor with oil-film support and the cracked rotor before and after adding rub-impact fault. The response of the system under various fault forms is obtained, and the theoretical simulation results under the same model are verified. It is of great significance for the fault study of rotor system.
【學位授予單位】：華北電力大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：TH133
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