Use of a MEMS accelerometer to measure orientation in a geotechnical centrifuge

Ryan D. Beemer, Giovanna Biscontin, Madhuri Murali, Charles P. Aubeny

    Research output: Contribution to journalArticle

    2 Citations (Scopus)

    Abstract

    Microelectromechanical systems (MEMS) accelerometers are becoming more prevalent in geotechnical engineering and geotechnical centrifuge modelling. In centrifuge experiments these sensors have shown great promise, but still exhibit limitations. This paper proposes a new methodology for the use of single-axis, low-g, high-accuracy MEMS accelerometers to measure the orientation of an object on the vertical rotational plane of centrifugal acceleration and Earth’s gravity in a geotechnical centrifuge. The method specifically compensates for the measured cross-axis acceleration by an MEMS accelerometer when in a high-g environment. This is done by determining the apparent internal misalignment of the MEMS sensing unit, relative to its packaging, from a high-g cross-axis calibration. The misalignment can then be used to correct the measured orientation of the sensor relative to a centrifuge gravity vector. When compared to simplified approaches, measurements of absolute orientation are improved by 0·89° and the standard deviation of measurements between multiple sensors is reduced by 0·71°. Overall, this new methodology significantly improves the accuracy of orientation measurements by MEMS accelerometers in the geotechnical centrifuge, opening the door to use these inexpensive sensors in more experiments.
    Notation
    Original languageEnglish
    Pages (from-to)253-265
    JournalInternational Journal of Physical Modelling in Geotechnics
    Volume18
    Issue number5
    Early online date2017
    DOIs
    Publication statusPublished - 1 Sep 2018

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