發(fā)布時(shí)間：2019-01-08 16:33

【摘要】：伴隨航空航天科學(xué)技術(shù)的飛速發(fā)展,航空發(fā)動(dòng)機(jī)的運(yùn)行安全及可靠性被人們廣泛關(guān)注。作為飛機(jī)的“核心動(dòng)力”,航空發(fā)動(dòng)機(jī)性能的好壞直接關(guān)系著飛機(jī)的飛行性能、可靠性以及乘客人身的安全性。虛擬現(xiàn)實(shí)技術(shù)可以有效降低產(chǎn)品的研制開(kāi)發(fā)成本,近年來(lái)廣泛應(yīng)用于各大制造行業(yè)。為了保障航空發(fā)動(dòng)機(jī)的可靠性,確保其安全運(yùn)行,減少其維護(hù)成本,論文在國(guó)家自然科學(xué)基金項(xiàng)目“基于虛擬現(xiàn)實(shí)技術(shù)的復(fù)雜機(jī)電系統(tǒng)故障預(yù)報(bào)與最優(yōu)維護(hù)研究”的支持下,基于虛擬現(xiàn)實(shí)技術(shù)對(duì)航空發(fā)動(dòng)機(jī)機(jī)械故障的診斷問(wèn)題開(kāi)展了研究。首先,研究了航空發(fā)動(dòng)機(jī)的機(jī)械系統(tǒng)故障機(jī)理,對(duì)機(jī)械系統(tǒng)中傳動(dòng)系統(tǒng)、滑油系統(tǒng)、密封系統(tǒng)和主軸軸承分別進(jìn)行了故障機(jī)理及常見(jiàn)故障類(lèi)型和原因的分析和研究,探究航空發(fā)動(dòng)機(jī)可能存在的故障及易發(fā)生故障的部位。利用虛擬現(xiàn)實(shí)技術(shù)建立了航空發(fā)動(dòng)機(jī)的參數(shù)化模型,為模擬航空發(fā)動(dòng)機(jī)運(yùn)行及故障再現(xiàn)提供了基礎(chǔ)。其次,在虛擬環(huán)境中對(duì)建立的虛擬模型進(jìn)行了邊界條件的確定以及約束的添加,模擬航空發(fā)動(dòng)機(jī)真實(shí)的工作過(guò)程,研究航空發(fā)動(dòng)機(jī)機(jī)械故障再現(xiàn)方法,應(yīng)用虛擬現(xiàn)實(shí)平臺(tái)EON Studio與LS-DYNA相結(jié)合的方法,將機(jī)械故障在虛擬現(xiàn)實(shí)平臺(tái)實(shí)現(xiàn)了再現(xiàn),通過(guò)虛擬再現(xiàn)方式確定故障部位。最后,根據(jù)先驗(yàn)知識(shí)和歷史信息,基于證據(jù)推理算法的置信規(guī)則庫(kù)方法建立了航空發(fā)動(dòng)機(jī)故障診斷模型,以航空發(fā)動(dòng)機(jī)風(fēng)扇受外物撞擊產(chǎn)生故障為例進(jìn)行,故障診斷實(shí)例分析。仿真實(shí)驗(yàn)與實(shí)例驗(yàn)證了建立的故障診斷模型,和基于虛擬現(xiàn)實(shí)技術(shù)與航空發(fā)動(dòng)機(jī)機(jī)械故障診斷方法結(jié)合的方法的正確性,對(duì)航空發(fā)動(dòng)機(jī)機(jī)械故障診斷提供了參考。
[Abstract]:With the rapid development of aerospace science and technology, the safety and reliability of aero-engine have been paid more and more attention. As the core power of aircraft, the performance of aeroengine is directly related to the flight performance, reliability and safety of passengers. Virtual reality technology can effectively reduce the cost of product research and development, and has been widely used in various manufacturing industries in recent years. In order to ensure the reliability of aero-engine, ensure its safe operation and reduce its maintenance cost, this paper is supported by the project of National Natural Science Foundation of China "Research on Fault Prediction and optimal maintenance of complex Electromechanical system based on Virtual reality Technology". Based on virtual reality technology, the problem of aero-engine mechanical fault diagnosis is studied. Firstly, the failure mechanism of mechanical system of aero-engine is studied, and the fault mechanism, common fault types and causes of transmission system, lubricating oil system, sealing system and spindle bearing in mechanical system are analyzed and studied respectively. Explore the possible malfunctions of aero-engines and the locations where they are likely to occur. The parameterized model of aero-engine is established by using virtual reality technology, which provides the foundation for simulation of aero-engine operation and fault reappearance. Secondly, in the virtual environment, the boundary conditions and constraints are determined, and the real working process of aero-engine is simulated, and the method of aero-engine mechanical fault reconstruction is studied. Using the method of combining virtual reality platform EON Studio and LS-DYNA, the mechanical fault is reproduced in virtual reality platform, and the fault location is determined by virtual reproducing method. Finally, according to the prior knowledge and historical information, a confidence rule base method based on evidential reasoning algorithm is established. The fault diagnosis model of aero-engine fan caused by external object impact is taken as an example, and the fault diagnosis example is analyzed. Simulation experiments and examples verify the correctness of the established fault diagnosis model and the combination of virtual reality technology and aero-engine mechanical fault diagnosis method, which provides a reference for aero-engine mechanical fault diagnosis.
【學(xué)位授予單位】：長(zhǎng)春工業(yè)大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類(lèi)號(hào)】：V263.6

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