Oil pump why vibration?

Summary
The oil pump vibration cause analysis unit and pumping station buildings vibrate more reason, some factors of both contact and interaction, summed up in the following four reasons.
1, electrical
Motor unit equipment, submersible pump motor internal magnetic imbalances and other disorders of the electrical system, often caused by
Vibration and noise. As asynchronous motor running, generated by the interaction of the stator and rotor teeth harmonic flux between the stator and rotor radial alternating magnetic pull, or large synchronous motor running, given rotor the magnetic center inconsistent or air gap all directions exceed the allowable deviation value, are likely to cause the motor periodic vibration and noise.
2, the mechanical aspects of
Motor and gear oil pump rotating component quality is uneven, shoddy, poor quality of the installation, the asymmetric unit axis runout exceeds the allowable value, the poorer parts of the mechanical strength and stiffness, wear and tear damage the bearing and seal components, pump critical speed and crew natural frequency has been caused by resonance will produce a strong vibration and noise.
3 oil force
Uneven distribution of the flow rate and pressure of the pump inlet, pulsation of the pump inlet and outlet pressure of the working fluid, the liquid flow around the drift and flow separation, non-defined conditions, as well as a variety of causes pump cavitation, are a common cause of pump unit vibration reasons. Start-up and shutdown of the oil pump, the valves open and close, the dynamic transition process of the change in working conditions and accident emergency stop oil pipeline caused dramatic changes in pressure and oil hammer, often lead to the pumping station and crew vibrate.
4, Oilers and other aspects of
Unit into the oil flow channel design is unreasonable or not matching with the unit, the oil pump submerged depth improper, as well as crew start the pump control valve
Unreasonable and shutdown order will make the oil inlet conditions deteriorate, swirl, the induced cavitation or aggravate the vibration of the unit and pumping stations. To unit startup destruction siphon vacuum drying, air hump segment backdrop of difficulties, forming siphon too long; shoot the door drying unit making door design is unreasonable, and open and closing, keep hitting film portal; support the basis of the pump and the motor occur uneven subsidence or less rigid, and other reasons, will also lead to the unit vibration.