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Suitability of MEMS Accelerometers for Condition Monitoring: An experimental study

View Article: PubMed Central - PubMed

ABSTRACT

With increasing demands for wireless sensing nodes for assets control and condition monitoring; needs for alternatives to expensive conventional accelerometers in vibration measurements have been arisen. Micro-Electro Mechanical Systems (MEMS) accelerometer is one of the available options. The performances of three of the MEMS accelerometers from different manufacturers are investigated in this paper and compared to a well calibrated commercial accelerometer used as a reference for MEMS sensors performance evaluation. Tests were performed on a real CNC machine in a typical industrial environmental workshop and the achieved results are presented.

No MeSH data available.


Measured acceleration responses by the MEMS accelerometers and the reference (PCB) accelerometer at 95Hz for the excitation amplitude 0.35g
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f9-sensors-08-00784: Measured acceleration responses by the MEMS accelerometers and the reference (PCB) accelerometer at 95Hz for the excitation amplitude 0.35g

Mentions: A few typical measured responses both in time and frequency domain are shown in Figures 3, 4, 5, 6, 7, 8, 9 and 10. No distortion is observed in the measured responses by the MEMS accelerometer (A), the sensitivity also almost stable, but MEMS (B) and (C) responses exhibit some distortion and this becomes bigger at lower frequency and g levels. There is also a significant shift in phase and the sensitivity compared to the reference accelerometer. In fact, the estimated sensitivity based on reference accelerometer seems to be varying from 37mV/g to 50mV/g for MEMS (B), and varies from 63mV/g to 111mV/g for MEMS (C). Phase shift is not constant with respect to the reference accelerometer responses which are clearly seen in the time response plots in Figures 3 to 10. It is noted the presence of a component at 600 Hz in all the responses; this is believed to be the test set up resonance.


Suitability of MEMS Accelerometers for Condition Monitoring: An experimental study
Measured acceleration responses by the MEMS accelerometers and the reference (PCB) accelerometer at 95Hz for the excitation amplitude 0.35g
© Copyright Policy
Related In: Results  -  Collection

Show All Figures
getmorefigures.php?uid=PMC3672998&req=5

f9-sensors-08-00784: Measured acceleration responses by the MEMS accelerometers and the reference (PCB) accelerometer at 95Hz for the excitation amplitude 0.35g
Mentions: A few typical measured responses both in time and frequency domain are shown in Figures 3, 4, 5, 6, 7, 8, 9 and 10. No distortion is observed in the measured responses by the MEMS accelerometer (A), the sensitivity also almost stable, but MEMS (B) and (C) responses exhibit some distortion and this becomes bigger at lower frequency and g levels. There is also a significant shift in phase and the sensitivity compared to the reference accelerometer. In fact, the estimated sensitivity based on reference accelerometer seems to be varying from 37mV/g to 50mV/g for MEMS (B), and varies from 63mV/g to 111mV/g for MEMS (C). Phase shift is not constant with respect to the reference accelerometer responses which are clearly seen in the time response plots in Figures 3 to 10. It is noted the presence of a component at 600 Hz in all the responses; this is believed to be the test set up resonance.

View Article: PubMed Central - PubMed

ABSTRACT

With increasing demands for wireless sensing nodes for assets control and condition monitoring; needs for alternatives to expensive conventional accelerometers in vibration measurements have been arisen. Micro-Electro Mechanical Systems (MEMS) accelerometer is one of the available options. The performances of three of the MEMS accelerometers from different manufacturers are investigated in this paper and compared to a well calibrated commercial accelerometer used as a reference for MEMS sensors performance evaluation. Tests were performed on a real CNC machine in a typical industrial environmental workshop and the achieved results are presented.

No MeSH data available.