20.500.12556/RUL-137282 Effect of vibration and noise measuring points distribution on the sensitivity of pump cavitation diagnosis Vpliv porazdelitve točk merjenja vibracij in hrupa na njihovo občutljivost pri diagnosticiranju kavitacije črpalk Cavitation is an essential factor in the deterioration of the hydraulic performance of centrifugal pumps. The study of cavitation fault diagnosis can help avoid or reduce the damage it causes. The vibration and noise analysis method can predict the incipient cavitation more accurately. In order to improve the accuracy of cavitation fault diagnosis, this paper studies the distribution of vibration and noise measuring points for centrifugal pump cavitation diagnosis. The research object is a centrifugal pump with an inducer and splitter blades. Vibration acceleration sensors and hydrophones were used to collect structural vibration and liquid-borne noise signals at different positions of the pump unit. Root-mean-square (RMS) and fast Fourier transform (FFT) methods were used to construct spectrums of vibration and noise signals with different NPSH and compare the sensitivity of different measuring points to the inception and development of cavitation. In addition, the SST k-ω turbulence model and Zwart cavitation model were used to study the cavitation volume distribution in the pump under different cavitation stages. By setting monitoring points at the impeller outlet, the frequency domain signal distribution of pressure pulsation was studied. The results show that the vibration acceleration measuring points at the pump inlet flange and pump axial position, and liquid-borne noise measuring point at the inlet position, are more sensitive to the diagnosis of cavitation fault. Motor current is also the basis for judging the inception of cavitation. Moreover, as the cavitation intensifies, the dominant frequency signal of the pressure pulsation in the pump is partially shifted. cavitation centrifugal pumps vibration noise measuring points spectral analysis kavitacija centrifugalne črpalke vibracije hrup merilne točke spektralne analize true false true Angleški jezik Slovenski jezik Članek v reviji 2022-06-09 11:48:07 2022-06-09 11:48:09 2022-09-15 04:14:54 0000-00-00 00:00:00 2022 0 0 Str. 325-338 no. 5 Vol. 68 2022 0000-00-00 Zaloznikova Objavljeno NiDoloceno 0000-00-00 0000-00-00 2022-01-01 532.528 0039-2480 10.5545/sv-jme.2022.59 111026435 Zhou_..._-_Effect_of_Vibration_and_Noise_Measuring_Points_Distribution_on_the_Sensitivity_of_Pump_Cavitation_Diagnosis.pdf Zhou_..._-_Effect_of_Vibration_and_Noise_Measuring_Points_Distribution_on_the_Sensitivity_of_Pump_Cavitation_Diagnosis.pdf 1 48B09672CA33178353F61386C32647E9 7f09a6cfd6e8f5f3a20d450a21bee808e5fd74ec9699c395e26bc76fb9e37b7b 75bce899-e7d9-11ec-8aca-00155dcfd717 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=157191 https://www.sv-jme.eu/sl/article/effect-of-vibration-and-noise-measuring-points-distribution-on-the-sensitivity-of-pump-cavitation-diagnosis/ 1 1d5b37cb-e7d9-11ec-8aca-00155dcfd717 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=157190 Fakulteta za strojništvo Strojniški vestnik 0 0 0