Abstract
The extended octagonal ring transducers are popular devices for force and moment measurements in agricultural engineering research due to its capability in measuring forces independently in two dimensions and resultant moment in one dimension. In this study design, construction and calibration of extended octagonal ring transducers are discussed. The transducers were designed to measure the two force components of the soil reaction with minimum cross-sensitivity. Strain distributions in the extended octagonal rings were analyzed using finite element method to locate optimal strain gauge positions to minimize cross-sensitivity between the two force components. A Data acquisition system consisted of a programmable DT800 data logger with 12 differential voltage and 16 frequency channels, and a PC for storing the data for further graphing and analysis. The system was tested for its sensitivity, cross-sensitivity, linearity and repeatability. The results of the calibration tests revealed that the system was well working for a range of draught and vertical forces up to 25 kN. The results showed a high degree of linearity between bridge output voltage and force applied. The minimum coefficient of determination, R 2, was found to be 0.99. The interactions of the applied forces on the orthogonal force bridges were less than one percent. The system could best be used for the measurement of draught (horizontal) and vertical forces where medium size equipment is attached with a tractor.
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Chen, Y., McLaughlin, N.B., and Tessier, S., Double Extended Octagonal Ring (DEOR) Drawbar Dynamometer, Soil & Tillage Research, 2006, vol. 93, pp. 462–471.
Cook N.H. and Rabinowicz, E., Physical Measurement and Analysis, N.Y.: Addison-Wesly, 1963, pp. 160–164.
Godwin, R.J., An Extended Octagonal Ring Transducer for Use in Tillage Studies, J. of Agricultural Engineers Research, 1975, vol. 20, pp. 347–352.
Godwin, R.J., Reynolds, A.J., O Dogherty, M.J., and Al-Ghazal, A.A., A Triaxial Dynamometer for Force and Management Measurement on Tillage Implements, J. of Agricultural Engineers Research, 1993, vol. 55, pp. 189–205.
Khan, J., Godwin, R.J., Kilgour, J., and Blackmore, B.S., Design and Calibration of a Bi-Axial Extended Octagonal Ring Transducer System for the Measurement of Tractor-Implement Forces, Asian Research Publishing Network, 2007, vol. 2, pp. 16–20.
Kheiralla, A.F., Yahya, A., Zohadie, M., and Ishak, W., Design and Development of Three-Point Auto hitch Dynamometer for an Agricultural Tractor, AJSTD, 2003, vol. 20, pp. 271–288.
Lowen, E.G. and Cook, N.G., Metal Cutting Measurements and their Interpretation, Proceedings of the Society of Experimental Stress Analysis, 1956, vol. 13(3), pp. 57–62.
McLaughlin, N.B., Correction of an Error in Equations for Extended Ring Transducers, Transactions of the ASAE, 1996, vol. 39, pp. 443–444.
McLaughlin, N.B., Chen, Y., and Tessier, S., Effect of Strain Gage Misalignment on Cross-Sensitivity in Extended Ring Transducers, CSAE Paper 05-063, CSAE, 2005, Winnipeg, MB, Canada.
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Abbaspour-Gilandeh, Y., Haghighat-Shishvan, S. Extended octagonal ring transducers for measurement of tractor-implement forces. Instrum Exp Tech 54, 136–140 (2011). https://doi.org/10.1134/S0020441211010015
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DOI: https://doi.org/10.1134/S0020441211010015