基于多点噪声分析的离心泵早期汽蚀故障诊断.pdfVIP

振 动 与 冲 击 第 3 6 卷第 7 期 JOURNAL OF VIBRATION AND SHOCK Vol. 36 No. 7 2017 基于多点噪声分析的离心泵早期汽蚀故障诊断 周云龙\吕远征 2 ( 1 . 东北电力大学能源与动力工程学院，吉 林 吉 林 132〇12 ;2 . 东北电力大学自动化工程学院，吉 林 吉 林 132 〇12 ) 主 商 要 ：提出了一种多点噪声分析法研究汽蚀故障下的离心菜噪声，总结其规律并应用到故障诊断中。将多个单 指向性麦克风附着于菜体的不同部位采集信号，通过多种矩阵的奇异值分解提取高品质的水动力噪声，根据 Llg ht hm 声 学理论，水动力噪声详细的反映着测点处的流场变化。为加快计算速度、降低内存，利用二代小波提取各点噪声能量谱， 并将所有测点的敏感频带共同组成特征向量以训练b p 神经网络。经诊断测试，多点噪声法快速、稳定且诊断成功率达 到93. 5 % ，证明比传统噪声诊断法更适合工业用途。 关键 词：离心菜;汽蚀;水动力噪声;S V D 二代小波 中图分类号：TH311 文献标志码 ： A D 0 I 10. ： 1 34 65 /j. cnki. jvs. 2 0 1 7 .0 7 .0 0 7 Incipient cavitations fault diagnosis for a centrifugal pump based on multi-position noise analysis ZHOU Yunlong1 ,LU Yuanzheng2 (1 . School of Energy Rescource and Mechanical Engineering, Northeast Electric Power University, Jilin 132012, China ； 2. School of Automatic Engineering, Northeast Electric Power University, Jilin 132012, China) Abstract ；Here, an analysis method of multi-position noise was proposed for studying a centrifugal pump ^ s noise when cavitations occurs to summarize its law and to apply this law in its incipient cavitations fault diagnosis. Several single directional microphones were attached to different positions of the pump, the high quality hydrodynamic noise was extracted by constructing several matrices and their singular value decomposition. According to Lighthill acoustics theory, the hydrodynamic noise reflects changes of the flow field near the placed microphones. In order to speed up the calculation and reduce the memory, energy spectra of all positions of hydrody