本文關鍵詞： 不平衡響應 磁懸浮軸承 剛度 阻尼 FIR 轉子有限元建模　出處：《南京航空航天大學》2012年碩士論文　論文類型：學位論文

【摘要】：磁懸浮軸承是利用電磁力作用使轉子懸浮于空間，實現無摩擦的一種新型高性能軸承。磁懸浮軸承的動力特性對整個系統(tǒng)的動態(tài)特性影響很大，而研究磁懸浮軸承的動力特性的難點在于磁懸浮軸承支承剛度和阻尼的確定�，F階段國內外還沒有一套完整的理論和方法來確定磁懸浮軸承的剛度和阻尼。因此，本文研究一種基于不平衡響應的磁懸浮軸承的剛度和阻尼的辨識方法，并用仿真和試驗驗證該方法的可行性。 首先在MSC.Patran中完成磁懸浮轉子有限元模型的建立，對轉子建模過程中提高建模準確性以及轉子不平衡響應分析中不平衡質量施加的問題做了詳細描述。詳細說明了辨識磁懸浮軸承剛度阻尼的基本原理，，運用Matlab編寫了辨識程序，用幾種不同剛度和阻尼支承情況的算例進行辨識仿真來驗證基于不平衡響應方法的正確性。為驗證基于不平衡響應辨識磁懸浮軸承剛度阻尼的方法的可行性，運用MSC.Nastran和Matlab對實驗室現有的磁懸浮軸承的剛度阻尼進行仿真辨識。仿真結果表明該方法可以正確辨識軸承的剛度和阻尼。 將基于不平衡響應的磁懸浮軸承的剛度和阻尼的辨識方法用到一個五自由度的磁懸浮軸承試驗臺上進行辨識試驗。針對試驗中采集的不平衡響應信號的是多個標準的正弦信號和高頻信號的迭加的情況，本文設計了低通FIR濾波器進行濾波來提取目標信號，經濾波仿真表明濾波器符合要求。試驗中用NI數據采集卡采集試驗信號，在Matlab中完成濾波、提取不平衡響應信號的幅值相位進而辨識磁懸浮軸承的剛度和阻尼。為驗證辨識結果的正確性，將試驗辨識的結果代入有限元軟件，賦予轉子有限元模型試驗辨識的剛度和阻尼做不平衡響應計算，研究計算結果與試驗結果，表明本文采用的辨識方法在一定程度上可以辨識剛性轉子下的磁懸浮軸承剛度和阻尼。
[Abstract]:Magnetic bearing is a new kind of high performance bearing which uses electromagnetic force to make the rotor suspended in space and realizes no friction. The dynamic characteristics of magnetic suspension bearing have a great influence on the dynamic characteristics of the whole system. The difficulty of studying the dynamic characteristics of maglev bearing is the determination of bearing stiffness and damping. At present, there is no complete theory and method to determine the stiffness and damping of maglev bearing. . In this paper, an identification method of stiffness and damping of magnetic bearing based on unbalanced response is studied, and the feasibility of this method is verified by simulation and experiment. Firstly, the finite element model of maglev rotor is established in MSC.Patran. In this paper, the problems of improving the accuracy of rotor modeling and the unbalance mass applied in rotor unbalance response analysis are described in detail, and the basic principle of identifying stiffness and damping of magnetic suspension bearing is explained in detail. The identification program is written with Matlab. Several examples of different stiffness and damping support are used to verify the correctness of the method based on unbalanced response. In order to verify the feasibility of the method based on unbalanced response to identify the stiffness and damping of maglev bearing. MSC.Nastran and Matlab are used to identify the stiffness and damping of the existing maglev bearing in laboratory. The simulation results show that the method can correctly identify the stiffness and damping of the bearing. The identification method of stiffness and damping of maglev bearing based on unbalanced response was applied to a five-degree-of-freedom maglev bearing test rig. The superposition of standard sinusoidal and high-frequency signals. In this paper, a low-pass FIR filter is designed to filter the target signal, and the filter simulation shows that the filter meets the requirements. NI data acquisition card is used to collect the test signal in the experiment. Filtering is completed in Matlab to extract the amplitude and phase of the unbalanced response signal and then to identify the stiffness and damping of the maglev bearing to verify the correctness of the identification results. The results of test identification are replaced by finite element software, and the stiffness and damping of finite element model identification of rotor are given to calculate the unbalanced response, and the results of calculation and test are studied. It is shown that the identification method can identify the stiffness and damping of magnetic bearing under rigid rotor to some extent.
【學位授予單位】：南京航空航天大學
【學位級別】：碩士
【學位授予年份】：2012
【分類號】：TH133.3

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