Research on flow-induced vibration,mechanical excitation,and motor drive end excitation characteristics of axial flow pump
To establish the correlation between the characteristics of various excitation sources and the output vibration characteristics of axial flow pump bodies,an experimental research was conducted on the axial flow pump with focus on flow-induced vibrations,mechanical excitations,and driving end excitation characteristics.By collecting the excitation characteristics under different sources and comparing them spectrally with the output vibration features of the pump bodies,the vibration spectra contributed by flow-induced vibrations,mechanical excitations,and motor-drive end excitations,along with their variation rules,were obtained.The results show that the primary cause of mechanical excitation is identified as rotor misalignment and rubbing,with vibration frequency characteristics predominantly centered at the 1×rotational frequency.Flow-induced vibrations are mainly attributed to interactions between stationary and rotating parts and periodic flow phenomena,and the vibration frequency characteristics are primarily concentrated at 2×rotational frequency,blade passing frequency,and its higher harmonics.Excitations at the motor driving end are found to result from high-frequency magnetic flux,and the vibration frequencies are characterized by above 900 Hz.Each excitation source contributes vibrations of differing frequency bands and amplitudes,collectively forming a coupled vibration output from multiple excitation sources.The vibration amplitudes induced by mechanical excitation and flow-induced vibrations exhibit a marked sensitivity to rotational speed,decreasing rapidly as the speed decreases.Meanwhile,the amplitude of motor-drive end excitation decays swiftly with increasing distance from the analysis position to the motor.These findings can provide theoretical support for subsequent optimization of vibration reduction and noise control in axial flow pumps.
axial flow pumpflow-induced vibrationmechanical excitationdrive end excitationpump vibration characteristics
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