【摘要】：在現(xiàn)代化工業(yè)建設中,大型的旋轉機械設備被廣泛應用在各個領域,轉軸上的疲勞裂紋是一類重要的轉子缺陷形式,若其不能被及時檢測出,將會導致災難性的后果,因此保證它們安全穩(wěn)定的運行是十分必要的。 本課題的目的是研究一種在時域上,對在線轉子的裂紋位置及深度進行診斷和識別的方法,稱為基于模型的轉子裂紋時域識別方法。首先需要利用已有的有通過限元法建立的裂紋-轉子模型,計算裂紋轉子的振動特性；基于模態(tài)擴展理論,通過使用有限個自由度上的振動擴展得到全部自由度的振動；運用動力學方程計算等效力,觀察裂紋等效力的分布；使用通過剛度的變化得到的理論裂紋模型,計算不同裂紋條件下的理論值；運用最小二乘法,分別對模態(tài)擴展得到的等效力的測量值,與通過理論裂紋模型得到的理論值,進行比較和篩選,找出最可能出現(xiàn)裂紋的位置跟深度,最后通過驗對結果進行了討論和驗證。
[Abstract]:In modern industrial construction, large rotating machinery is widely used in various fields. The fatigue crack on rotating shaft is an important form of rotor defect. If it can not be detected in time, it will lead to disastrous consequences. Therefore, it is necessary to ensure their safe and stable operation. The purpose of this paper is to study a method to diagnose and identify the position and depth of a rotor crack in time domain, which is called a model-based method for rotor crack identification in time domain. Firstly, the vibration characteristics of cracked rotor should be calculated by using the existing crack-rotor model established by finite element method, and the vibration of all degrees of freedom can be obtained by using the vibration propagation on finite degrees of freedom based on modal expansion theory. Using the kinetic equation to calculate the equal force, observe the distribution of the equal force of the crack, use the theoretical crack model obtained by the change of stiffness, calculate the theoretical value under different crack conditions, use the least square method, The measured values of equal force obtained by modal propagation and the theoretical values obtained by theoretical crack model are compared and screened to find out the most likely location and depth of cracks. Finally, the results are discussed and verified by a test.
【學位授予單位】：華東理工大學
【學位級別】：碩士
【學位授予年份】：2012
【分類號】：TH165.3

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