The SKYTOWER and SKYMOBILE programs for locating and designing skyline harvest units.

Twito, R.H.; McGaughey, Robert J.; Reutebuch, Stephen E.

doi:10.2737/pnw-gtr-215

Cited by 1 publication

(1 citation statement)

References 7 publications

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“…Those models are the results of improvements and adaptions of pioneering works developed between the 1960s and 1980s (Zweifel 1960, Pestal 1961, Carson and Mann 1970, Carson and Mann 1971, Irvine 1981, based on different type and level of approximation of non-linear catenary equations. Further studies and the progression of computer technologies improved the base algorithms and led to the development of updated procedures and tools for skyline layout, payload analysis, and tensile force calculations (Carson 1975, Tobey 1980, Falk 1981, Bodenhausen 1982, Chung 1987, Twito et al 1988, Jarmer and Sessions 1992, Charland et al 1994, Chung and Sessions 2003, Bont and Heinimann 2012, Dupire et al 2015. Among others, SkylineXL (Rheinberger 2018) is one of the most common software currently available worldwide for skyline layout calculation.…”

Section: Introductionmentioning

confidence: 99%

Skyline Tensile Forces in Cable Logging

Mologni

Marchi

Lyons

et al. 2021

Croat. j. for. eng. (Online)

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Skyline tensile forces have been shown to frequently exceed the recommended safety limits during ordinary cable logging operations. Several models for skyline engineering analyses have been proposed. Although skyline tensile forces assume a dynamic behaviour, practical solutions are based on a static approach without consideration of the dynamic nature of the cable systems.The aim of this study was to compare field data of skyline tensile forces with the static calculations derived by dedicated available software such as SkylineXL. To overcome the limitation of static calculation, this work also aimed to simulate the actual response of the tensile fluctuations measured in the real environment by mean of a finite element model (FEM).Field observations of skyline tensile forces included 103 work cycles, recorded over four different cable lines in standing skyline configuration. Payload estimations, carriages positions, and time study of the logging operations were also collected in the field. The ground profiles and the cable line geometries were analysed using digital elevation models. The field data were then used to simulate the work cycles in SkylineXL. The dynamic response of six fully-suspended loads in a single-span cable line was also simulated by a dedicated FEM built through ANSYS®. The observed data and the software calculations were then compared.SkylineXL resulted particularly reliable in the prediction of the actual tensile forces, with RMSE ranging between 7.5 and 13.5 KN, linked to an average CV(RMSE) of 7.24%. The reliability in predicting the peak tensile forces was lower, reporting CV(RMSE) of 10.12%, but still not likely resulting in a safety or performance problem. If properly set-up and used, thus, SkylineXL could be considered appropriate for operational and practical purposes. This work, however, showed that finite element models could be successfully used for detailed analysis and simulation of the skyline tensile forces, including the dynamic oscillations due to the motion of the carriage and payload along the cable line. Further developments of this technique could also lead to the physical simulation and analysis of the log-to-ground interaction and the investigation of the breakout force during lateral skidding.

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Section: Introductionmentioning

confidence: 99%