Vibration cause analysis
Analysis of the causes of pump vibration leads to many reasons for vibration in units and pump room buildings, and some factors are both related and interacting, which can be summarized as follows: there are mainly the following four reasons.
Electrical aspects

Submersible pumps
The motor is the main equipment of the unit, and the internal magnetic imbalance of the motor and the imbalance of other electrical systems often cause vibration and noise. For example, in the operation of asynchronous motor, the radial alternating magnetic tension between the stator and rotor generated by the harmonic magnetic flux interaction of the stator and rotor teeth, or the inconsistency of the magnetic center of the stator and rotor or the air gap difference in each direction exceeding the allowable deviation value during the operation of the large synchronous motor, may cause periodic vibration and noise of the motor.
Mechanical aspects
The quality of the motor and pump rotating parts is unbalanced, shoddy, poor installation quality, the axis of the unit is asymmetrical, the swing exceeds the allowable value, the mechanical strength and rigidity of the parts are poor, the bearing and sealing parts are worn and damaged, and the critical speed of the pump has been resonating with the natural frequency of the unit, etc., will produce strong vibration and noise.
Hydraulics

Water pump control valve
The uneven flow rate and pressure distribution at the inlet of the pump, the pressure pulsation of the working liquid at the inlet and outlet of the pump, the liquid around the flow, the deflection flow and deflow, the non-quota working conditions and the cavitation of the pump caused by various reasons are all common causes of vibration of the pump unit. Sudden changes in pressure and water hammer in the water pipeline caused by dynamic transition processes such as pump start and stop, valve opening and closing, working condition changes and accident emergency shutdown often lead to vibration in the pump room and unit.