Journal of Biosystems Engineering

Korean Society for Agricultural Machinery (한국농업기계학회)
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Rheological Properties of Bundled Leaf Vegetables Held and Picked-up by Machine

줄기 엽채소의 기계적 파지시 리올로지 특성

  • Jun, Hyeon-Jong (National Institute of Agricultural Engineering (NIAE)) ;
  • Kim, Sang-Hun (Division of Agricultural Engineering, Kangwon National University)
  • Published : 2007.12.25
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Abstract

This study was carried out as basic researches to develop the leaf vegetable harvester. This study was conducted to investigate physical and rheological properties of bundled leaf vegetables with stem (Chinese leek, Crown daisy and Chamnamul) as test materials held and picked-up by a machine. Stress-strain behavior, stress relaxation, and strain recovery for the bundled materials were analyzed using simple Maxwell model. Physical and rheological properties of the materials were investigated by measuring rupture load, deformation and stress experimentally. Also, strain recovery time when unloading was measured using super high speed camera. Recorded recovery time for stress-strain behavior was0.026 s for Chinese leek with liner strain recovery, 0.046 s for Crown daisy and 0.05 s for Chamnamul with non-linear strain recovery. Furthermore, the strain recovery time for permanent deformation was 0.026 s, 0.046 s, and 0.05 s for Chinese Leek, Crown daisy and Chamnamul, respectively. Finally, strain recovery time and strain recovery ratio for the test materials were 0.17 s, 60.4% in Chinese leek, 0.12 s, 55.3% in Crown daisy, 0.15 s, 58.7% in Chamnamul. Here strain recovery time means that how fast the test materials are recovered from initial deformation and strain recovery ratio means how much the test materials are recovered from initial deformation. The above results show that the test materials can be held enough and moved by the belts.

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References

  1. ASAE (American Society of Agricultural Engineers). 2002. ASAE Standards 2002. 49th Edition. pp. 592-599
  2. Huh, Y. K. and S. W. Lee. 1991. Studies on rheological properties of rice plants at the booting stage. J. of KSAM 16(1): 37-48. (In Korean)
  3. Park, J. M. and M. S. Kim. 1994. Linearized rheological models of fruits. J. of KSAM 16(1):138-147. (In Korean)
  4. Jun, H. J., S. H. Kim, J. T. Hong and Y. Choi. 2005. Cutting and conveying characteristics for development of Chinese leek harvester. J. of Biosystems Eng. 30(4):220-228. (In Korean) https://doi.org/10.5307/JBE.2005.30.4.220
  5. Jun, H. J. 2006. Development of a stem-cutting type harvester for non-head leary green vegetables. Ph.D. thesis, Kangwon National University, Chuncheon, Korea. (In Korean)
  6. Kim, M. S., S. R. Kim and J. M. Park. 1990a. Rheological properties of rough rice (I) -Stress relaxation of rough rice kernel-. J. of KSAM 15(3):207-218. (In Korean)
  7. Kim, MS., S. R Kim and J. M Park. 1990b. Rheological properties of rough rice (II) -Compressive creep of rough rice kernel-. J. of KSAM 15(3):219-229. (In Korean)
  8. Kim, M. S., J. M. Park and D. S. Choi. 1992. Viscoelastic properties of fruit flesh (II) -Stress relaxation behavior-. J. of KSAM 17(3):260-271. (In Korean)
  9. Mohsenin, N. 1986. Physical Properties of Plant and Animal Materials, 2th ed. pp. 151-187
  10. Telis-Romero, J., A. L. Gabas and P. J. A. Sobral. 2004. OSMO-convective drying of Mango cubes in fluidized bed and tray dryer. Drying 2004-Proceeding of the 14th International Drying Symposium (IDS 2004) San Paulo, Brazil 22-25 August 2004, Vol. C, pp. 1868-1875