Vibration Analysis for Machine Monitoring and Diagnosis: A Systematic Review

Table 4

The advantages and disadvantages of various sensors used in vibration analysis for machine monitoring and diagnosis.

Sensors		Advantages	Disadvantages
Piezoelectric accelerometer		Lightweight, high sensitivity, good frequency, dynamic range	Needs electronic integration to acquire velocity and displacement data, vulnerable to interference from the external environment
MEMS accelerometer	Cheaper than piezoelectric sensor, requires low processing power, high sensitivity			Suffers from poor signal-to-noise ratio
Velocity transducer	Can operate without any external device, generally costs less than other sensors			Limited operational frequency range, most velocity transducers are prone to reliability problems at operational frequency of more than 121°C
Displacement sensor	Good sensitivity, simple postprocessing circuit with negligible maintenance			Succeptible to shock, difficult to install
LDV	Ease of changing the measurement points, ability to provide long-range measurements without compromising the signal quality			Extremely high cost, limited portability