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http://dx.doi.org/10.14578/jkfs.2019.108.4.562

Traction Performance Improvement Study on a Small-scale Tower Yarder Attached to a Farm Tractor  

Paik, Seung Ho (Forest Technology and Management Research Center, National Institute of Forest Science)
Choi, Yun-Sung (Forest Technology and Management Research Center, National Institute of Forest Science)
Cho, Min-Jae (Forest Technology and Management Research Center, National Institute of Forest Science)
Mun, Ho-Seong (Forest Technology and Management Research Center, National Institute of Forest Science)
Han, Sang-Kyun (Department of Forestry, Korea National College of Agriculture and Fisheries)
Kim, Dae-Hyun (Department of Biosystems Engineering, Kangwon National University)
Oh, Jae-Heun (Forest Technology and Management Research Center, National Institute of Forest Science)
Publication Information
Journal of Korean Society of Forest Science / v.108, no.4, 2019 , pp. 562-573 More about this Journal
Abstract
In a cable yarding system, a small-scale tower yarder attached to a farm tractor wasdeveloped and used for small-diameter tree harvesting operations. Based on this design, improvement of traction performance was required for medium- and large-diameter tree harvesting operations. In this study, the mechanical transmission employed for the tower yarder was modified into ahydro-mechanical transmission system. Maximum traction forces, including tractor engine speed and hydraulic power pressure, were investigated, and comparisons were made between the mechanical and hydro-mechanical transmission systems. Six tractor engine speeds (1,200, 1,400, 1,600, 1,800, 2,000, and 2,200) and three levels of power transmission mechanism pressure (4.9, 6.9, and 8.8 MPa) were investigated in the two different transmission systems. Results showed a maximum traction force of 15,146.6 N at an engine rotation speed of 757 rpm in the current mechanical transmission system, and 36,140.0 N at anengine rotation speed of 1,575 rpm in the modified hydro-mechanical transmission system. The maximum traction forces for the hydro-mechanical transmission were 2.4 times greater than those of the mechanical transmission, and may therefore be applicable to medium and large-diameter tree harvesting operations. Thus,as a modified version of the conventional transmission system, the new hydro-mechanical transmission system may be cost-effective for use in large-scale cable yarding operations. In the future, however, it will be necessary to investigate problems that may arise from field application tests.
Keywords
traction performance; forestry machine; tower yarder; performance improvement;
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