Theoretical Stability and Traction of Steep Slope Tethered Feller-Bunchers
Manual felling in afforested land is a productivity constraint and, more importantly, a safety concern. This has prompted the development of innovative mechanized harvesting systems to overcome the constraint, particularly on steeper slopes. The primary technique that has been developed and employed consists of cable-assisted, or “tethered,” feller-bunchers, which use tension in a wire rope anchored upslope to assist with traction and gradeability. However, despite their deployment internationally, there is little quantitative framework with which to evaluate the relationship between tether tension, stability, ground pressures, and slip, especially in the context of machine specifications and site operative conditions. This study presents a theoretical framework that uses a moment equilibrium approach to evaluate the relationship between equipment dimensions and specifications and soil and site conditions to identify allowable slopes of operation and associated ground pressures. This quantitative framework highlights the facts that deeper grousers, higher cable tensions, wider tracks, and uphill boom orientation all increase gradeability and stability during operation. Inversely, effective track length (hence, increased soil pressures) and stability are decreased from grappling of heavier trees, operation on weaker soils, fully extended boom operation in the downhill direction, and increasing slope. Increasing soil pressure, increasing slope, and decreasing stability may increase soil disturbance but needs to be corroborated with future, planned field tests.
No Reference information available - sign in for access.
No Citation information available - sign in for access.
No Supplementary Data.
No Article Media
Document Type: Research Article
Publication date: 2017-04-02
More about this publication?
- Important Notice: SAF's journals are now published through partnership with the Oxford University Press. Access to archived material will be available here on the Ingenta website until March 31, 2018. For new material, please access the journals via OUP's website. Note that access via Ingenta will be permanently discontinued after March 31, 2018. Members requiring support to access SAF's journals via OUP's site should contact SAF's membership department for assistance.
Forest Science is a peer-reviewed journal publishing fundamental and applied research that explores all aspects of natural and social sciences as they apply to the function and management of the forested ecosystems of the world. Topics include silviculture, forest management, biometrics, economics, entomology & pathology, fire & fuels management, forest ecology, genetics & tree improvement, geospatial technologies, harvesting & utilization, landscape ecology, operations research, forest policy, physiology, recreation, social sciences, soils & hydrology, and wildlife management.
Forest Science is published bimonthly in February, April, June, August, October, and December.
2016 Impact Factor: 1.782 (Rank 17/64 in forestry)
Average time from submission to first decision: 62.5 days*
June 1, 2016 to Feb. 28, 2017
Also published by SAF:
Journal of Forestry
Other SAF Publications
- Submit a Paper
- Membership Information
- Author Guidelines
- Ingenta Connect is not responsible for the content or availability of external websites