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  本文選題：Hertz接觸　切入點：榫連結構　出處：《東北大學》2012年碩士論文

【摘要】：壓氣機是一種高度復雜和精密的熱力機械,其性能的好壞直接影響著飛機的飛行性能、可靠性及經(jīng)濟性。近年來我國航空發(fā)動機所發(fā)生的重大機械故障中,壓氣機中轉動件的失效高達80%以上。因此,壓氣機的研發(fā)水平在很大程度上決定了航空技術的發(fā)展水平。 壓氣機的榫連結構,是典型的接觸形式。由于壓氣機葉片受到復雜的載荷作用,包括葉片本身質量所產(chǎn)生的離心力,氣體作用產(chǎn)生的氣動力及其振動等,使得榫頭、榫槽連接的接觸部分不僅產(chǎn)生較嚴重的應力集中,而且工作時構件內(nèi)應力狀態(tài)非常復雜,榫連結構已經(jīng)成為壓氣機故障多發(fā)的部位之一。統(tǒng)計資料表明,壓氣機故障中有時高達20%的故障是由于榫頭、榫槽結構失效造成的。因此,考慮壓氣機榫連結構中榫頭、榫槽接觸問題的計算顯得至關重要,本文的主要研究內(nèi)容如下： (1)利用榫連結構接觸的基本理論——Hertz接觸理論和庫侖摩擦定律進行研究,分析Hertz接觸理論和庫侖摩擦定律在接觸問題的實際應用條件和典型算例,并結合簡化直榫頭榫連結構的具體應用進行了具體計算。 (2)對不同工況下的榫連結構接觸面特性進行參數(shù)影響對比分析,確定接觸面穩(wěn)定的網(wǎng)格數(shù)量；分析直、斜榫頭榫連結構在不同接觸變量下的接觸壓力、滑移距離和接觸狀態(tài)等接觸特性；對比在實際工作狀態(tài)下提取的不同三維附加載荷條件對接觸特性影響。 (3)對碰摩載荷作用下的榫連結構接觸面特性進行分析,分析和對比葉片與機匣間在不同侵入量和不同碰摩方式下的接觸面特性。 (4)基于HyperWorks對榫連結構的輪盤進行拓撲優(yōu)化分析,在給定材料和載荷等約束條件并滿足強度的前提下,將輪盤的質量降到最低,滿足提高推重比和發(fā)動機輕型化要求。
[Abstract]:Compressor is a kind of highly complex and precise thermal machinery. Its performance directly affects the flight performance, reliability and economy of aircraft. The failure of rotating parts in compressor is more than 80%. Therefore, the development level of compressor decides the development level of aeronautical technology to a great extent. The tenon and tenon structure of the compressor is a typical contact form. Because the compressor blade is subjected to complex loads, including centrifugal force generated by the mass of the blade itself, aerodynamic force generated by the gas action and its vibration, etc. The contact part of tenon groove joint not only produces more serious stress concentration, but also the internal stress state of the component is very complex. The tenon and tenon structure has become one of the parts with many compressor faults. Sometimes up to 20% of compressor faults are caused by tenon and tenon structure failure. Therefore, it is very important to calculate the contact problem between tenon and tenon in compressor tenon and tenon structure. The main contents of this paper are as follows:. In this paper, Hertz contact theory and Coulomb friction law are studied, and the practical application conditions and typical examples of Hertz contact theory and Coulomb friction law in contact problems are analyzed by using Hertz contact theory and Coulomb friction law. Combined with the concrete application of simplified tenon and tenon structure, the concrete calculation is carried out. (2) to compare and analyze the contact surface characteristics of tenon and tenon structure under different working conditions, to determine the stable mesh number of contact surface, to analyze the contact pressure of tenon and tenon structure with straight and oblique tenons under different contact variables, and to analyze the contact pressure of tenon and tenon joint structure under different contact variables. The contact characteristics, such as slip distance and contact state, are compared with the effects of different three-dimensional additional load conditions extracted in the actual working state on the contact characteristics. (3) the contact surface characteristics of tenon structure under rub-impact load are analyzed, and the contact surface characteristics between blade and casing under different intrusions and different rub-impact modes are analyzed and compared. 4) based on the HyperWorks topology optimization analysis of the wheel plate with tenon structure, the quality of the wheel disk is reduced to the lowest under the given constraint conditions such as material and load and the strength, which meets the requirements of improving the push-weight ratio and the light weight ratio of the engine.
【學位授予單位】：東北大學
【學位級別】：碩士
【學位授予年份】：2012
【分類號】：TH45

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