A new frame-based calibration method for extended octagonal ring transducers
Article
Article Title | A new frame-based calibration method for extended octagonal ring transducers |
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ERA Journal ID | 3444 |
Article Category | Article |
Authors | Aikins, Kojo Atta (Author), Desbiolles, Jack M.A. (Author), Jensen, Troy A. (Author) and Antille, Diogenes L. (Author) |
Journal Title | Applied Engineering in Agriculture |
Journal Citation | 37 (2), pp. 379-387 |
Number of Pages | 9 |
Year | 2021 |
Place of Publication | St Joseph, MI, United States |
ISSN | 0883-8542 |
1943-7838 | |
Digital Object Identifier (DOI) | https://doi.org/10.13031/aea.14252 |
Abstract | An extended octagonal ring transducer (EORT) is a simple, single, and compact biaxial force measuring transducer, which is ideal for soil force measurement in tillage tool research. Calibration of EORTs is needed to ascertain their sensitivities and to determine an accurate calibration equation to convert voltage output to force measurement. Typically, calibration of EORTs involves the use of universal tensile testing machines, hydraulic systems and large gravitational loads (hanging weights) to apply loads. In this study, a simple calibration frame that enables application of non-gravitational loads was evaluated and used to hold and calibrate an EORT through both uniaxial and biaxial loading. The frame was suitable for both uniaxial and biaxial application of offset coincident force up to 3000 N and centered perpendicular force up to 1500 N. The EORT exhibited a strong linear relationship (R2 ≥ 0.9998) between applied forces and voltage outputs, low hysteresis errors (≤0.4%), and low cross-sensitivities (3.61% and 1.6% for coincident and perpendicular forces, respectively). Calibration equations developed from the primary bridge output data or from the biaxial loading data using the frame produced good force predictions, which also improved when taking into account the impacts of cross-sensitivity. The results confirmed that this calibration approach can integrate the interactions of output cross-sensitivity to deliver more accurate force prediction. Coefficients of determination of the relationships between applied and predicted forces were 0.9993 to 0.9996 and 0.9877 to 0.9984 for coincident and perpendicular forces, respectively. This calibration frame presents potential for safely applying large, non-gravitational loads in a contained and portable manner and its concept can easily be adapted to suit the scale of the transducer. |
Keywords | biaxial loading, cross-sensitivity, EORT calibration, offset coincidental force, uniaxial loading |
ANZSRC Field of Research 2020 | 409901. Agricultural engineering |
Public Notes | Files associated with this item cannot be displayed due to copyright restrictions. |
Byline Affiliations | Centre for Agricultural Engineering |
University of South Australia | |
Institution of Origin | University of Southern Queensland |
https://research.usq.edu.au/item/q658z/a-new-frame-based-calibration-method-for-extended-octagonal-ring-transducers
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