压力脉动法在变转速离心泵汽蚀诊断中的研究

发布时间：2018-01-11 11:02

本文关键词：压力脉动法在变转速离心泵汽蚀诊断中的研究　出处：《东北电力大学》2012年硕士论文　论文类型：学位论文

更多相关文章： 压力脉动 汽蚀 小波能量 EMD HHT

【摘要】：离心泵是一种通用的流体机械设备，它在电力、石油化工、农业排灌及纺织等行业都发挥着重要作用。汽蚀是一种常见的水泵故障。汽蚀的产生和发展会改变流道内的速度分布，造成泵的流量和扬程降低、效率下降，损伤叶轮等过流部件。故障诊断目前已成为一门独立的跨学科的综合信息处理技术。它是保证设备安全运行的基本措施之一。它能够对设备的早期故障做出预报，对出现故障的原因做出判断，避免或减少事故的发生。寻找适当的汽蚀诊断和识别方法，快速准确的排除汽蚀故障，防止汽蚀破坏，，提高水泵的效率和使用寿命，具有重要意义。本文主要是通过对不同流量下汽蚀信号的分析，完成对离心泵汽蚀故障的诊断研究。为了使实验数据更加的精确，实验过程中采用变频器改变流量、采用涡轮流量计测流量。根据入口压力脉动信号的特点，对离心泵汽蚀故障诊断问题进行研究。最后，运用不同的方法，对所采集的信号进行了分析和处理。文章从小波能量分析、EMD能量熵分析、EMD能量与HHT边际谱频带能量分析三个方面对采集到的入口压力脉动信号进行处理比较，得到每种方法的相对优点，并分析了各种方法最适合于诊断离心泵汽蚀的哪个或哪几个阶段，为各种方法在实际中的应用打下了较好的理论基础。
[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.

【学位授予单位】：东北电力大学
【学位级别】：硕士
【学位授予年份】：2012
【分类号】：TH311

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