Graduate Thesis Or Dissertation
 

A study of the lateral yarding forces in a cable thinning

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https://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/np193d14q

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  • This paper describes the results of a project conducted to determine the magnitude of and the parameters affecting the magnitude of the cable tensions generated during lateral yarding operations in a cable thinning. Specific emphasis was placed on measuring mainline tensions as a function of turn weight, turn length, mainline vertical angle, mainline to log lead angle, ground slope, distance from carriage, number of logs per turn and thinning intensity. The results show that the force resisting initial movement, exclusive of the gravitational component, is independent of the variables studied except number of logs per turn and thinning intensity. The average resistive force for two log turns was twice the magnitude of the resistive force for one log turns. The resistive forces encountered in heavier thinnings were higher than those encountered in lighter thinnings. An upper limit of the magnitude of the mainline tensions necessary to cause initial log movement can be predicted by determining the resistive force such that an arbitrary percentage of the turns will result in a resistive force that will be less. The mathematical expression is: P=R+Wcosθ/cos(α-θ) where P = tension necessary to cause initial movement R = resistive force, W = turn weight, α = mainline angle, θ = ground slope. The tensions developed during lateral inhaul, that is, after the turn has broken loose, can be predicted by the equation: T=W(µcosθ + sinθ)/cos(α-θ) + µsin(α-θ) where T = tension developed during lateral inhaul, µ = frictional coefficient. The frictional coefficient for this study was determined to be 0.64.
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