發(fā)布時(shí)間：2018-04-20 06:01

  本文選題：滑動軸承 + 聲發(fā)射　； 參考：《長沙理工大學(xué)》2011年碩士論文

【摘要】：滑動軸承是汽輪發(fā)電機(jī)組軸系的重要支撐部件,其良好的工作狀態(tài)是保證整個(gè)機(jī)組安全穩(wěn)定運(yùn)行的基礎(chǔ)。因此,研究滑動軸承狀態(tài)與其聲發(fā)射信號特征之間的定性或定量關(guān)系,開發(fā)出用于滑動軸承狀態(tài)監(jiān)測的應(yīng)用技術(shù),對維護(hù)設(shè)備安全運(yùn)行具有十分重要的理論價(jià)值和工程指導(dǎo)作用。 基于LabVIEW軟件平臺,本文開發(fā)了基于聲發(fā)射技術(shù)的滑動軸承狀態(tài)監(jiān)測系統(tǒng),在實(shí)驗(yàn)室對該系統(tǒng)的性能進(jìn)行了實(shí)驗(yàn)驗(yàn)證。實(shí)驗(yàn)結(jié)果表明:該系統(tǒng)反應(yīng)靈敏,準(zhǔn)確可靠,操作方便;且在對連續(xù)型聲發(fā)射信號的趨勢分析上,優(yōu)于PAC公司生產(chǎn)的PCI-2型聲發(fā)射檢測儀。 本文根據(jù)滑動軸承的工作特點(diǎn),建立了摩擦功率損失與轉(zhuǎn)速、油溫、油壓、軸承靜載荷之間的定性關(guān)系。提出了大型汽輪發(fā)電機(jī)組滑動軸承狀態(tài)聲發(fā)射監(jiān)測方案。并使用開發(fā)出的聲發(fā)射檢測系統(tǒng)進(jìn)行工程應(yīng)用試驗(yàn),對300MW及600MW汽輪發(fā)電機(jī)組啟動全過程中滑動軸承狀態(tài)進(jìn)行監(jiān)測。對現(xiàn)場監(jiān)測結(jié)果進(jìn)行分析發(fā)現(xiàn):軸承油膜較厚時(shí),聲發(fā)射信號較強(qiáng);油膜較薄時(shí),聲發(fā)射信號較弱;油膜消失產(chǎn)生干摩擦?xí)r,聲發(fā)射信號又急劇增強(qiáng),當(dāng)滑動軸承潤滑工況嚴(yán)重惡化時(shí),聲發(fā)射信號大幅范圍內(nèi)跳動。通過與振動信號測試系統(tǒng)相比,滑動軸承聲發(fā)射監(jiān)測系統(tǒng)靈敏度高,監(jiān)測結(jié)果準(zhǔn)確,可靠。 通過對理論研究和試驗(yàn)研究結(jié)果進(jìn)行深入對比分析,找到了滑動軸承聲發(fā)射信號特征隨滑動軸承潤滑狀態(tài)的變化規(guī)律,為實(shí)時(shí)診斷滑動軸承的狀態(tài)提供了重要依據(jù)。
[Abstract]:Sliding bearing is an important supporting part of turbogenerator shafting, and its good working condition is the basis to ensure the safe and stable operation of the whole unit. Therefore, the qualitative or quantitative relationship between the state of sliding bearing and its acoustic emission signal characteristics is studied, and the applied technology for monitoring the state of sliding bearing is developed. It has very important theoretical value and engineering guidance to maintain the safe operation of equipment. Based on the LabVIEW software platform, this paper develops a sliding bearing state monitoring system based on acoustic emission technology. The performance of the system is verified experimentally in the laboratory. The experimental results show that the system is sensitive, accurate, reliable and easy to operate, and is superior to the PCI-2 acoustic emission detector produced by PAC in analyzing the trend of continuous acoustic emission signals. According to the working characteristics of sliding bearing, the qualitative relationship between friction power loss and rotational speed, oil temperature, oil pressure and bearing static load is established in this paper. A scheme of acoustic emission monitoring for the condition of sliding bearing of large turbogenerator set is presented. Using the developed acoustic emission testing system to carry out engineering application tests to monitor the state of sliding bearing in the whole process of start-up of 300MW and 600MW turbogenerator sets. It is found that the acoustic emission signal is stronger when the oil film is thick, the acoustic emission signal is weak when the oil film is thin, and the acoustic emission signal increases sharply when the oil film disappears and produces dry friction. When the lubricating condition of the sliding bearing deteriorates seriously, the acoustic emission signal jumps in a large range. Compared with the vibration signal testing system, the acoustic emission monitoring system of sliding bearing has high sensitivity, accurate and reliable monitoring results. By comparing and analyzing the theoretical and experimental results, the variation of acoustic emission signal characteristics with lubricating state of sliding bearing is found, which provides an important basis for real-time diagnosis of sliding bearing state.
【學(xué)位授予單位】：長沙理工大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2011
【分類號】：TH165.3

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