Modelling Dynamic Skyline Tensions in Rigging Configurations: North Bend, South Bend, and Block in the Bight Case Studies

摘要: In New Zealand the proportion of forest land requiring cable extraction is likely to increase from a current 40% more than 60% in next 10 year period. Previous studies have shown that there are number different rigging configurations used, and some preferred others given location. This study attempted quantify skyline tensions due dynamic (i.e. shock) loading for each Fall Block configurations: North Bend, South Bend Bight. The effect choker length was also tested. Simulated yarding tests were performed using University Canterbury’s School Forestry Model Yarder. Skyline tension measured load cell connected laptop computer recording nearest gram continuously at 20 reading per second. recorded video operation line simultaneously Snagit capturing software. later used time analysis. Results indicated compared configuration had lowest peak when dropped into full suspension bridling. found during simulated collisions with ground objects. A two-way ANOVA simulation, drop test only case where statistically significant variable. Longer chokers increased magnitude shock significantly most cases.