本文選題：磁軸承 + 瞬態(tài)時域響應�。� 參考：《南京航空航天大學》2012年碩士論文

【摘要】：磁軸承-轉(zhuǎn)子系統(tǒng)的動態(tài)特性是磁軸承的支承參數(shù)與轉(zhuǎn)子動力學綜合作用的結(jié)果。本文從磁軸承-轉(zhuǎn)子系統(tǒng)的時域響應出發(fā)，采用有限元模型修正技術(shù)，圍繞磁軸承支承動態(tài)特性的參數(shù)識別問題展開。具體研究內(nèi)容如下： 利用有限元方法建立軸承-轉(zhuǎn)子系統(tǒng)有限元動力學模型，結(jié)合通用有限元軟件NASTRAN介紹了系統(tǒng)瞬態(tài)時域響應以及轉(zhuǎn)子不平衡響應的求解方法，并通過實例驗證其求解可靠性。 以基于模態(tài)參數(shù)的有限元模型修正為基礎，，實現(xiàn)了基于時域響應的有限元模型修正技術(shù)，對其中的關鍵技術(shù)進行理論研究，最終實現(xiàn)修正過程。通過仿真算例驗證了時域修正方法的精度。 為了建立模型修正所需要的精確有限元模型，對磁軸承-轉(zhuǎn)子系統(tǒng)的阻尼進行了研究。應用時域修正方法通過試驗數(shù)據(jù)修正了自由-自由狀態(tài)轉(zhuǎn)子的模態(tài)阻尼比以及靜態(tài)懸浮下的磁軸承-轉(zhuǎn)子系統(tǒng)的支承參數(shù)，最后識別出磁軸承-轉(zhuǎn)子系統(tǒng)的靜態(tài)懸浮支承剛度和阻尼。 從控制特性出發(fā)研究了磁軸承支承參數(shù)的理論非線性。結(jié)合支承剛度的理論非線性模型，建立了非線性支承參數(shù)下的磁軸承-轉(zhuǎn)子系統(tǒng)有限元模型。通過有限元分析研究了非線性支承參數(shù)對系統(tǒng)動態(tài)響應的影響，并應用時域修正技術(shù)識別了磁軸承的非線性參數(shù)。
[Abstract]:The dynamic characteristics of the magnetic bearing-rotor system are the result of the combined action of the supporting parameters of the magnetic bearing and the rotor dynamics. Based on the time-domain response of the magnetic bearing-rotor system, the finite element model correction technique is used to solve the problem of parameter identification of the dynamic characteristics of the magnetic bearing. The specific research contents are as follows: the finite element dynamic model of bearing-rotor system is established by finite element method, and the transient time-domain response and rotor unbalance response of the system are introduced with the general finite element software NASTRAN. Based on the finite element model modification based on modal parameters, the finite element model correction technology based on time domain response is realized. The key technologies are theoretically studied and the correction process is finally realized. The accuracy of the time domain correction method is verified by a simulation example, and the damping of the magnetic bearing-rotor system is studied in order to establish the accurate finite element model for the model modification. The time domain correction method is used to modify the modal damping ratio of the free state rotor and the supporting parameters of the magnetic bearing rotor system under static suspension. Finally, the static suspension stiffness and damping of the magnetic bearing-rotor system are identified, and the theoretical nonlinearity of the supporting parameters of the magnetic bearing is studied based on the control characteristics. A finite element model of magnetic bearing-rotor system with nonlinear bearing parameters is established based on the theoretical nonlinear model of supporting stiffness. The influence of the nonlinear bearing parameters on the dynamic response of the system is studied by finite element analysis, and the nonlinear parameters of the magnetic bearing are identified by using the time-domain correction technique.
【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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