In the field of rotating machinery,rotor vibration is like the"heartbeat"of equipment;its performance directly reflects the health status of mechanical operation.The core characteristics of vibration can be captured through three basic elements:amplitude,frequency,and phase.Amplitude reflects the vibration intensity,frequency indicates the vibration source,and phase expresses the relative timing relationship of the vibration.Together,these three form the diagnostic foundation.

(Bonve Pump Industry Three-Lobe Rotor)

Vibration can be classified based on direction into radial vibration and axial vibration.Radial vibration is perpendicular to the shaft system and often stems from rotor imbalance or misalignment.Axial vibration is parallel to the axis and mostly caused by thrust bearing failures or thermal expansion.Furthermore,based on the relationship with rotational speed,vibration can also be distinguished as synchronous vibration and asynchronous vibration.Synchronous vibration has a frequency identical to or a multiple of the rotational speed,commonly seen in rotor imbalance or misalignment.Asynchronous vibration is unrelated to rotational speed,such as that caused by oil whip or aerodynamic disturbances.

In vibration measurement,eddy current sensors are typically used to measure the relative vibration of the shaft relative to the bearing housing,while absolute vibration reflects the vibration of the shaft relative to the ground and requires the use of composite sensors.Additionally,bearing housing vibration(pedestal vibration)is also an important indicator for assessing support conditions.

Rotor vibration not only originates from external excitation but can also come from feedback of the system's own energy.Forced vibration is caused by periodic external forces,while self-excited vibration stems from internal mechanisms of the system(such as oil film forces,seal dynamics,etc.)and often possesses suddenness and harmfulness.Random vibration cannot be described by a deterministic function and is commonly found in fluid machinery or under complex operating conditions.

Particularly noteworthy are critical speed and resonance phenomena.When the rotor speed approaches the system's natural frequency,resonance occurs,sharply amplifying vibration,which can seriously lead to structural damage.Therefore,identifying and avoiding critical speed is key in rotor design and operation.

During actual operation,the rotor may also exhibit precession phenomena,where the rotor's centerline performs a conical motion around the theoretical axis.Precession in the same direction as rotation is called forward precession,while precession in the opposite direction is reverse precession,with the latter often indicating system faults.

Furthermore,interference factors must be considered in vibration signal measurement.For example,mechanical runout and electrical runout can affect the accuracy of non-contact sensors,collectively referred to as"runout."Values measured at low speeds are typically used to calibrate this error.

Eccentricity is also a polysemous concept:it can refer to the imbalance caused by the mass center deviating from the center of rotation,or it can represent the static offset of the journal within the bearing,with the latter often used to monitor bearing load conditions.

(Bonve Pump Industry Three-Lobe Rotor Pump)

In summary,rotor vibration is a complex phenomenon with multiple layers and mechanisms.From excitation types to measurement methods,from fault surface to signal analysis,a comprehensive understanding of these terms and concepts is the core foundation for achieving intelligent equipment diagnosis and predictive maintenance.

Bonve always adheres to the philosophy of "Wholeheartedly Making Good Rotor Pumps," committed to providing global customers with customized conveying and mixing solutions. If you have technical inquiries, selection needs, case references, or other cooperation intentions related to Bonve rotor pumps, please feel free to contact us.  

Service Hotline: 0574-87588986 13586591794  

Official Website: www.bvpumps.com  

Business Email: market@bonvepumps.com  

We look forward to working with you to drive efficiency and innovation in industrial fluid transmission with precision technology.