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| Rotor dynamic feature of core pulling mixed flow pump during startup process |
| Liang Xing |
| School of Mechanical and Electrical Engineering, Nanchang Institute of Technology, Nanchang, Jiangxi 330099, China |
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Abstract Focusing on the abnormal vibration of a core pulling mixed flow pump, the vibration causes were explored by the tested signal analysis, and then the rotodynamic model was established based on the Lagrange equations, which complies with the energy conservation. Comparing the peak-peak va-lue and vibration frequency of tested signals with that of simulated signals, the simulation precision was verified, and the start-up characteristics, such as the shaft orbit and vibration frequency, were simulated to search the vibration mitigation measures. The test signal analysis shows that, the impact force at the start-up process causes the rotor misalignment, and the misalignment will reduce but not disappear when the pump′s rotational speed reaches the design value. The simulation results verify the precision of test analysis, and the internal connection between the accompanied impact force and units vibrations was studied. The powerful impact force is more likely to induce the severe vibration and misalignment. Because the accompanying impact force is induced by motor direct start, to improve unit start-up mode and reduce the impact force can weaken vibration and enhance the operation reliability effectively.
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Received: 07 March 2014
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| [1]黄志伟,周建中,寇攀高,等.水轮发电机组轴系非线性电磁振动特性分析[J].华中科技大学学报:自然科学版,2010,38(7):20-24. Huang Zhiwei,Zhou Jianzhong,Kou Pangao,et al. Nonlinear electromagnetic vibration of rotor-bearing system of hydropower unit[J].Journal of Huazhong University of Science and Technology:Natural Science Edition,2010,38(7):20-24.(in Chinese)[2]Li Wei,Yang Yi,Sheng Deren,et al.A novel nonlinear model of rotor/bearing/seal system and numerical analysis[J].Mechanism and Machine Theory,2011,46(5):618-631.[3]Tiwari R,Chakravarthy V. Simultaneous estimation of the residual unbalance and bearing dynamic parameters from the experimental data in a rotor-bearing system[J].Mechanism and Machine Theory,2009,44(4):792-812.[4]Bai Bing,Zhang Lixiang,Guo Tao,et al. Analysis of dynamic characteristics of the main shaft system in a hydro-turbine based on ANSYS [J].Procedia Enginee-ring,2012,31:654-658.[5]赵鹏.离心泵振动故障诊断方法研究及系统实现[D].北京:华北电力大学能源动力与机械工程学院,2011.[6]Chang Jian,Cai Wan,Chen Chaokuang.Chaos of rub-impact rotor supported by bearings with nonlinear suspension[J].Tribology International,2009,42(3):426-439.[7]Mohammad A,Shudeifat A,Eric A, et al. General harmonic balance solution of a cracked rotor-bearing-disk system for harmonic and sub-harmonic analysis: Analy-tical and experimental approach[J]. International Journal of Engineering Science,2010,48(10):921-935.[8]Chen Y S,Cheng Y D,Yang T,et al.Accurate identification of the frequency response functions for the rotor-bearing-foundation system using the modified pseudo mode shape method[J].Journal of Sound and Vibration,2010,329(6): 644-658.[9]Lee A S,Ha J W.Prediction of maximum unbalance responses of a gear-coupled two-shaft rotor-bearing system[J].Journal of Sound and Vibration,2005,283(3/4/5):507-523.[10]Inayat H, Jawaid I.Nonlinear dynamics of a magnetically supported rigid rotor in auxiliary bearings[J].Mechanism and Machine Theory,2010,45(10): 1651-1667.[11]Albraik A, Althobiani F, Gu F, et al. Diagnosis of centrifugal pump faults using vibration methods[C]//Proceedings of the 25th International Congress on Condition Monitoring and Diagnostic Engineering, 2012.[12]周云龙, 刘永奇, 薛广鑫,等.基于EMD和边际谱频带能量的离心泵汽蚀故障诊断[J].化工学报,2012,63(2):545-550. Zhou Yunlong,Liu Yongqi, Xue Guangxin,et al. Fault diagnosis of cavitation for centrifugal pump based on EMD and HHT marginal spectrum energy[J]. CIESC Journal,2012,63(2):545-550.(in Chinese)[13]Henríquez P, Alonso J B,Ferrer M A,et al. Fault diagnosis using audio and vibration signals in a circulating pump[C]//Proceedings of 25th International Congress on Condition Monitoring and Diagnostic Engineering, 2012.[14]杨志荣.基于多源信息融合的水电机组故障诊断与轴心轨迹识别技术研究[D]. 武汉:华中科技大学水电与数字化工程学院,2011.[15]梁兴,刘梅清,刘志勇,等.立式混流泵异常振动测试分析[J].排灌机械工程学报,2013, 31(5):373-378. Liang Xing,Liu Meiqing,Liu Zhiyong, et al. Test and analysis of abnormal vibration of vertical mixed-flow pump[J].Journal of Drainage and Irrigation Machinery Engineering, 2013, 31(5):373-378.(in Chinese) |
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