Improving the performance of multispan logging systems by suspending the mainline Public Deposited

http://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/nc580p55r

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  • Multispan skyline logging systems are cable systems designed to yard logs over steep terrain having a constant or convex slope. An intermediate skyline support is used to raise the skyline high enough to achieve ground clearance without overstressing the skyline. Certain improvements in performance can be realized by providing intermediate support for the mainline as well as the skyline. A computer model has been developed to compare the performance of two possible suspended-mainline multispan logging systems. One of the systems is capable of suspending the mainline at the skyline intermediate support using a compound jack, and the other, the squirrel carriage, suspends the mainline from a pair of sheaves which are free to change location under the influence of cable forces. The computer model is capable of predicting the effect of different parameters on the performance of the logging systems. Simulations on a typical logging setting, varying one parameter at a time, suggest that: (1) Either system of suspending the mainline can potentially improve net payload, ground clearance of the mainline, and the likelihood of successful passage of the skyline carriage over the intermediate support jack. (2) The compound jack system is capable of better performance than the squirrel carriage system under most conditions. (3) The squirrel carriage system performance improves on steeper slopes and with optimum squirrel carriage weight. Squirrel carriage performance worsens as the ground profile becomes more convex.
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  • description.provenance : Approved for entry into archive by Laura Wilson(laura.wilson@oregonstate.edu) on 2008-10-09T18:51:36Z (GMT) No. of bitstreams: 1 Durston, Thomas MS.pdf: 811232 bytes, checksum: e4f9f0bee0bd9907929be6dcae1d0d09 (MD5)
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  • description.provenance : Submitted by Anna Opoien (aoscanner@gmail.com) on 2008-09-10T20:40:34Z No. of bitstreams: 1 Durston, Thomas MS.pdf: 811232 bytes, checksum: e4f9f0bee0bd9907929be6dcae1d0d09 (MD5)
  • description.provenance : Approved for entry into archive by Laura Wilson(laura.wilson@oregonstate.edu) on 2008-10-09T18:47:40Z (GMT) No. of bitstreams: 1 Durston, Thomas MS.pdf: 811232 bytes, checksum: e4f9f0bee0bd9907929be6dcae1d0d09 (MD5)

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