【摘要】：針對應用三維有限元法計算大型汽輪發(fā)電機組轉子-末級葉片耦合系統扭轉振動時存在自由度多和難以實現等問題,在模態(tài)綜合法(CMS)的基礎上,推導了計算轉子-末級葉片耦合系統振動的分層二重CMS法的基本方程,給出了降階的思路和原理.采用該方法對某1 000 MW汽輪發(fā)電機組的轉子、末級和次末級葉片組成的耦合系統進行了扭轉振動特性計算和分析,與不考慮末級、次末級葉片實際結構影響的固有振動特性進行了對比.結果表明:如果不考慮末級葉片的實際結構,會漏掉一些重要的振動模態(tài),給轉子和葉片的安全帶來隱患;降階前系統的自由度達到1.5億,而降階后系統的廣義自由度僅為原自由度的0.07%;分層二重CMS法可用于大功率機組轉子、末級、次末級耦合系統的扭轉振動分析.
[Abstract]:In order to solve the problems of many degrees of freedom and difficulty to realize the torsional vibration of the rotor-last-stage blade coupling system of large turbine-generator set by using three-dimensional finite element method, the modal synthesis method (CMS) is used to solve the problem. The basic equations of the layered double CMS method for calculating the vibration of the rotor-final blade coupling system are derived, and the idea and principle of reducing the order are given. This method is used to calculate and analyze the torsional vibration characteristics of the coupled system composed of the rotor, the last stage and the secondary stage of a 1 000 MW turbine-generator set. The natural vibration characteristics of the actual structure of the secondary stage blade are compared. The results show that if the actual structure of the final stage blade is not considered, some important vibration modes will be missed, which will bring hidden trouble to the safety of rotor and blade, and the degree of freedom of the system before reducing the order can reach 150 million, The generalized degree of freedom of the reduced system is only 0.07 of the original degree of freedom, and the layered dual CMS method can be used to analyze the torsional vibration of the rotor, the last stage and the second stage coupling system of the high-power unit.
【作者單位】： 西安交通大學機械結構強度與振動國家重點實驗室;東方汽輪機有限公司;
【基金】：國家973計劃資助項目(2011CB706505) 國家自然科學基金資助項目(51275385)
【分類號】：TM311

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相關期刊論文 前5條

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本文編號：2238485