壓力脈動(dòng)法在變轉(zhuǎn)速離心泵汽蝕診斷中的研究
本文關(guān)鍵詞:壓力脈動(dòng)法在變轉(zhuǎn)速離心泵汽蝕診斷中的研究 出處:《東北電力大學(xué)》2012年碩士論文 論文類型:學(xué)位論文
更多相關(guān)文章: 壓力脈動(dòng) 汽蝕 小波能量 EMD HHT
【摘要】:離心泵是一種通用的流體機(jī)械設(shè)備,它在電力、石油化工、農(nóng)業(yè)排灌及紡織等行業(yè)都發(fā)揮著重要作用。汽蝕是一種常見(jiàn)的水泵故障。汽蝕的產(chǎn)生和發(fā)展會(huì)改變流道內(nèi)的速度分布,造成泵的流量和揚(yáng)程降低、效率下降,損傷葉輪等過(guò)流部件。 故障診斷目前已成為一門(mén)獨(dú)立的跨學(xué)科的綜合信息處理技術(shù)。它是保證設(shè)備安全運(yùn)行的基本措施之一。它能夠?qū)υO(shè)備的早期故障做出預(yù)報(bào),對(duì)出現(xiàn)故障的原因做出判斷,避免或減少事故的發(fā)生。尋找適當(dāng)?shù)钠g診斷和識(shí)別方法,快速準(zhǔn)確的排除汽蝕故障,防止汽蝕破壞,,提高水泵的效率和使用壽命,具有重要意義。 本文主要是通過(guò)對(duì)不同流量下汽蝕信號(hào)的分析,完成對(duì)離心泵汽蝕故障的診斷研究。為了使實(shí)驗(yàn)數(shù)據(jù)更加的精確,實(shí)驗(yàn)過(guò)程中采用變頻器改變流量、采用渦輪流量計(jì)測(cè)流量。根據(jù)入口壓力脈動(dòng)信號(hào)的特點(diǎn),對(duì)離心泵汽蝕故障診斷問(wèn)題進(jìn)行研究。最后,運(yùn)用不同的方法,對(duì)所采集的信號(hào)進(jìn)行了分析和處理。 文章從小波能量分析、EMD能量熵分析、EMD能量與HHT邊際譜頻帶能量分析三個(gè)方面對(duì)采集到的入口壓力脈動(dòng)信號(hào)進(jìn)行處理比較,得到每種方法的相對(duì)優(yōu)點(diǎn),并分析了各種方法最適合于診斷離心泵汽蝕的哪個(gè)或哪幾個(gè)階段,為各種方法在實(shí)際中的應(yīng)用打下了較好的理論基礎(chǔ)。
[Abstract]:Centrifugal pump is a kind of general fluid machinery equipment, it is in the power, petrochemical industry, agricultural irrigation and textile industries have played an important role. Cavitation is a common fault of pump. The emergence and development of cavitation can change the velocity distribution, caused by the flow and head of pump is reduced, efficiency decreased damage vanes.
Fault diagnosis has become an independent and comprehensive information processing technology. It is one of the basic measures to ensure the safe operation of the equipment. It can predict the early fault of equipment, make a judgment on the reasons for failure to avoid or reduce the occurrence of accidents. For the diagnosis and identification of the appropriate method of cavitation, fast and accurate exclude cavitation fault, prevent cavitation damage, enhancing efficiency and service life, which is of great significance.
This paper is mainly through the analysis of the different flow cavitation signal, complete the diagnosis of Cavitation Fault of centrifugal pump. In order to make the experiment data more accurate, in the course of the experiment by changing the flow transducer, using turbine flowmeter measurement. According to the characteristics of the entrance pressure fluctuation signal, study on the problem of fault diagnosis of centrifugal pump cavitation finally., using different methods of signal acquisition and processing were analyzed.
From the wave energy analysis, analysis of EMD energy entropy, EMD energy and HHT marginal spectrum of the three aspects of entrance pressure fluctuation signal of collected comparative analysis of frequency band energy, get the relative merits of each method, and analyzes all kinds of method is the most suitable for the diagnosis of centrifugal pump cavitation is the one or several stages which, under the a good theoretical foundation for the application of method.
【學(xué)位授予單位】:東北電力大學(xué)
【學(xué)位級(jí)別】:碩士
【學(xué)位授予年份】:2012
【分類號(hào)】:TH311
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