Analysis of impact of MEMS accelerometer positioning on vibration sensor performance
DOI:
https://doi.org/10.24425/mms.2025.155798Abstract
This paper aims to present an approach to optimising MEMS-based vibration sensors by strategically placing the accelerometer to maximise the sensor’s performance. Optimisation requires establishing specific criteria, and in this case, the objective is to maximise SNR, which is crucial for ensuring accurate and reliable measurements. In practical applications, vibration signals received by sensors can be highly complex, often containing a cyclic fault signature that is distorted by the transmission path. In addition, signals are frequently obscured by noise from other sources, reducing overall SNR. Addressing these issues, sensor placement becomes critical, as different positions in the structure can either amplify or decrease fault signatures that are essential for diagnosis. In the past, MEMS vibration sensors were efficient only for low frequency bands. The selected MEMS sensor has a linear frequency response range up to 11 kHz, so research focused on maintaining the linear response in our range of interest, and therefore the sensor design proves the ability to cover a wide frequency band. Having such a MEMS sensor enables one to create Condition Monitoring (CM) for early detection of various faults. One of the problems in realisation of a sensor is the design of the mechanical part so that the vibrations of machinery are properly transmitted in the frequency band of a sensor. Equally important is finding a location within the sensor to achieve an optimal signal transfer path. Ultimately, this optimisation aims to provide a robust solution for diagnostics, making MEMS-based sensors a viable alternative to piezoelectric sensors in industrial environments.References
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