Effect of Vibration and Noise Measuring Points Distribution on the Sensitivity of Pump Cavitation Diagnosis

Cavitation is an essential factor in the deterioration of hydraulic performance centrifugal pumps. The study cavitation fault diagnosis can help avoid or reduce damage it causes. vibration and noise analysis method predict incipient more accurately. In order to improve accuracy diagnosis, this paper studies distribution measuring points for pump diagnosis. research object a with inducer splitter blades. Vibration acceleration sensors hydrophones were used collect structural liquid-borne signals at different positions unit. Root-mean-square (RMS) fast Fourier transform (FFT) methods construct spectrums NPSH compare sensitivity inception development cavitation. addition, SST k-? turbulence model Zwart volume under stages. By setting monitoring impeller outlet, frequency domain signal pressure pulsation was studied. results show that inlet flange axial position, point are sensitive fault. Motor current also basis judging Moreover, as intensifies, dominant partially shifted.