Abstract：The cavitation of mixed flow pumps can cause the pump performance decline, and accompanies with violent vibration and noise. To analyze the vibration and noise characteristics of a mixed flow pump and detect the cavitation, the vibration and noise signals were obtained by acceleration sensors mounted on different positions and a hydrophone in pump inlet. The experimental data were further a-nalyzed by a third times octave spectrum analysis method, and the characteristics of vibration and noise induced by cavitation were obtained. The results show that the vibration signals on pump inlet flange and on the case near pump inlet are more sensitive to pump cavitation, and it can be used for detecting cavitation; with the increasing of the flow rate, the frequency range of vibration signals for detecting the cavitation becames wider; the noise level induced by cavitation firstly gets higher with the frequency increasing, and the noise level reduces gradually when the frequence reaches the extreme value; the low frequency noise in pump inlet can be used to detect cavitation.
[1]王秀礼,袁寿其,朱荣生,等. 离心泵汽蚀非稳定流动特性数值模拟[J]. 农业机械学报, 2012,43(3):67-72. Wang Xiuli,Yuan Shouqi,Zhu Rongsheng,et al. Numerical simulation on cavitation unsteady characteristics in centrifugal pump[J]. Transactions of the Chinese Society for Agricultural Machinery, 2012,43(3):67-72.(in Chinese)[2]崔宝玲,万忠,朱祖超,等. 具有诱导轮的高速离心泵汽蚀特性试验[J]. 农业机械学报, 2010,41(3):96-99. Cui Baoling,Wan Zhong,Zhu Zuchao,et al.Research on suction performance of high-speed centrifugal pump with inducer[J]. Transactions of the Chinese Society for Agricultural Machinery, 2010,41(3):96-99.(in Chinese)[3]沙毅,侯丽艳.旋流泵叶轮位置对性能影响与无叶腔流场测定[J]. 农业机械学报,2010,41(11):57-62. Sha Yi,Hou Liyan.Effect of impeller location and flow measurement in volute of a vortex pump[J]. Transactions of the Chinese Society for Agricultural Machinery, 2010,41(11):57-62.(in Chinese)[4]Ni Yongyan, Yuan Shouqi, Pan Zhongyong, et al. Detection of cavitation in centrifugal pump by vibration methods [J]. Chinese Journal of Mechanical Enginee-ring:English Edition, 2008, 21(5):46-49.[5]Cernetic J. The use of noise and vibration signals for detecting cavitation in kinetic pumps [J]. Journal of Mechanical Engineering Science, 2009, 223(7): 1645-1655.[6]Alfayez L, Mba D, Dyson G. The application of acoustic emission for detecting incipient cavitation and the best efficiency point of a 60 kW centrifugal pump: Case study[J]. NDT and E International, 2005,38(5): 354-358.[7]Cudina M. Detection of cavitation phenomenon in a centrifugal pump using audible sound[J]. Mechanical Systems and Signal Processing,2003,17(6):1335-1347.[8]段向阳,王永生,苏永生. 振动分析在离心泵空化监测中的应用[J]. 振动与冲击,2011,30(4):161-165. Duan Xiangyang, Wang Yongsheng, Su Yongsheng. Vibration analysis applied in cavitation monitoring of a centrifugal pump [J]. Journal of Vibration and Shock, 2011, 30(4):161-165.(in Chinese)[9]Escaler X, Egusquiza E, Mohamed F, et al. Detection of cavitation in hydraulic turbines[J]. Mechanical Systems and Signal Processing, 2006,20(4): 983-1007.[10]Surendra N G, Kanakasabai V. Using vibration signatures analysis to detect cavitation in centrifugal pumps[C]//Proceedings of the Society for Experimental Mechanics Series. New York: Springer New York, 2011: 499-507.[11]王勇,刘厚林,袁寿其,等. 离心泵非设计工况空化振动噪声的试验测试[J]. 农业工程学报, 2012,28(2):35-38. Wang Yong, Liu Houlin, Yuan Shouqi, et al. Experimental testing on cavitation vibration and noise of centrifugal pumps under off-design conditions[J]. Transactions of the CSAE, 2012, 28(2): 35-38.(in Chinese)[12]刘玮,李华彪. 利用低频位移信号分析大型混流泵的振动状态[J]. 噪声与振动控制, 2008,28(4):122-123. Liu Wei, Li Huabiao. Application of low frequency signal in analyzing the vibration state of large-scale mixed-flow pump[J]. Noise and Vibration Control, 2008,28(4):122-123.(in Chinese)[13]占梁梁,张勇传,周建中,等. 轴流转浆式水轮机空化振动监测的试验研究[J]. 水力发电学报, 2008,27(5):142-146. Zhan Liangliang, Zhang Yongchuan, Zhou Jianzhong, et al. Experiment investigation of the cavitation vibration detection of Kaplan turbine[J]. Journal of Hydroelectric Engineering, 2008, 27(5):142-146.(in Chinese)[14]冯涛,刘克,李晓宏,等. 离心泵水动力噪声测试系统的研制[J]. 流体机械, 2005, 33(4): 27-30. Feng Tao, Liu Ke, Li Xiaohong, et al. Development of the experiment system for measuring the hydrodynamic noise in centrifugal pump[J]. Fluid Machinery, 2005,33(4):27-30.(in Chinese)
