Application of a tangent curve mathematical model for analysis of the mechanical behaviour of sunflower bulk seeds
 
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1
Department of Agricultural Engineering, University of Sumatera Utara, Prof. A. Sofyan No. 3 Kampus USU, Medan, Indonesia Republic
2
Department of Mechanical Engineering, Czech University of Life Sciences Prague, Kamycka 129, Praha 6, Czech Republic
3
Department of Material Science and Manufacturing Technology, Czech University of Life Sciences Prague, Kamycka 129, Praha 6, Czech Republic
Publish date: 2015-10-29
 
Int. Agrophys. 2015, 29(4): 517–524
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ABSTRACT
This paper evaluate the use of a tangent curve mathematical model for representation of the mechanical behaviour of sunflower bulk seeds. Compression machine (Tempos Model 50, Czech Republic) and pressing vessel diameter 60 mm were used for the loading experiment. Varying forces between 50 and 130 kN and speeds ranging from 10, 50, and 100 mm min-1 were applied respectively on the bulk seeds with moisture content 12.37±0.38% w.b. The relationship between force and deformation curves of bulk seeds of pressing height 80 mm was described. The oil point strain was also determined from the different deformation values namely 30, 35, 40, and 45 mm at speed 10 mm min-1. Based on the results obtained, model coefficients were determined for fitting the experimental load and deformation curves. The validity of these coefficients were dependent on the bulk seeds of pressing height, vessel diameter, maximum force 110 kN, and speed 10 mm min-1, where optimal oil yield was observed. The oil point was detected at 45 mm deformation giving the strain value of 0.56 with the corresponding force 16.65±3.51 kN and energy 1.06±0.18 MJ m-3. At the force of 130 kN, a serration effect on the curves was indicated; hence, the compression process was ceased.
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