Journal of Korean Society of Forest Science (한국산림과학회지)

Korean Society of Forest Science (한국산림과학회)
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A Study on the Cutting Optimal Power Requirements of Fast Growing Trees by Circular Saw

원형톱에 의한 속성수 절단 적정 소요동력 산정에 관한 연구

  • Choi, Yun Sung (Forest Practice Research Center, Korea Forest Research Institute) ;
  • Kim, Dae Hyun (Department of Bio-Systems Engineering, Kangwon National University) ;
  • Oh, Jae Heun (Forest Practice Research Center, Korea Forest Research Institute)
  • 최윤성 (국립산림과학원 산림생산기술연구소) ;
  • 김대현 (강원대학교 바이오시스템공학과) ;
  • 오재헌 (국립산림과학원 산림생산기술연구소)
  • Received : 2014.05.02
  • Accepted : 2014.05.30
  • Published : 2014.09.30
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Abstract

In this study, Italy poplar(Populus euramericana) was selected for test specimen to measure cutting power when it harvested. The experiment has been controlled as three levels of feed rate (0.41, 1.25 and 2.5 m/s), sawing speed (800, 1,000 and 1,200 rpm), and the five levels of root collar diameter (50, 70, 90 and 110, 130 mm). The harvested volume after 3 years (root collar diameter 50 mm) was 10.5 tons, which falls short of the target amount of biomass is 20~30 ton/ha. In addition, the biomass amount of diameter 90 and 110 mm which reached the target amount were estimated to be 23.5 and 32.5 ton/ha respectively. As a result of experiment, it was found out that power of 128.2 and 175.8 W are consumed in case of cutting with the feed rate of 0.41m/s and minimum sawing speed (800 rpm) respectively. With the working area of 0.3 ha/h, it is considered to present working capacities of 16.5 and 22.8 ton/h respectively. The power consumed at the feed rate of 1.25 m/s is estimated to be 113.8 and 153.7W respectively and working capacity in a working area of 1 ha/h is estimated to be 23.5 and 32.5 ton/h. The power consumed at the feed rate of 2.5 m/s is estimated to be 119.8 and 166.9 W respectively and working capacity in a working area of 2 ha/h is estimated to be 47.0 and 65.5 ton/ha respectively. Therefore, the power source of harvest machine at the feed rate of 1.25, 2.50 m/s and sawing speed of 800 rpm shall be selected as it can process the target amount of estimated biomass.

본 연구에서는 단벌기 바이오매스 생산림(Short rotation forest, SRF)에 식재되어 있는 속성수인 이태리포플러(Populus euramercicana)을 이용하여 수확 시 소요되는 동력을 측정하여 수확기계 동력원을 선정하기 위한 기초자료를 제공하기 위하여 수행되었다. 실험 수준은 밀기속도(0.41, 1.25, 2.5 m/s) 3수준, 절단속도(800, 1,000, 1,200 rpm) 3수준, 근원경(50, 70, 90, 110, 130 mm) 5수준으로 선정하였다. 목표로 하는 바이오매스 추정량은 20~30 ton/ha이나 3년 후 수확(근원경 50 mm) 시 이를 못 미치는 10.5 ton로 나타났다. 목표량에 도달할 수 있는 바이오매스 추정량은 근원경 90, 110 mm으로 각각 23.5, 32.5 ton/ha으로 추정되었다. 실험결과, 밀기속도 0.41 m/s에서 최소절단속도(800 rpm)로 절단 시 소요되는 동력은 각각 128.2, 175.8 W로 나타났고, 작업면적이 0.3 ha/h에서 작업능률은 각각 16.5, 22.8 ton/h을 처리할 수 있는 것으로 사료된다. 밀기속도 1.25 m/s에서는 소요되는 동력은 각각 113.8, 153.7 W, 작업면적이 1 ha/h에서 작업능률은 각각 23.5, 32.5 ton/h을 처리할 수 있는 것으로 사료된다. 밀기속도 2.5 m/s에서는 소요되는 동력은 각각 119.8, 166.9 W, 작업면적 2 ha/h에서 작업능률은 각각 47.0, 65.5 ton/ha을 처리할 수 있을 것으로 사료된다. 따라서 목표로 하는 바이오매스 추정량을 처리할 수 있는 밀기속도 1.25, 2.50 m/s, 절단속도 800 rpm 일 때의 수확기계의 동력원을 선정할 수 있을 것으로 사료된다.

Keywords

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