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- Title
Modeling Biomass Transport on Single-Lane Forest Roads.
- Authors
Simwanda, Matamyo; Sessions, John; Boston, Kevin; Wing, Michael G.
- Abstract
We describe a chip truck travel time prediction simulation model named CHIP-TRUCK. CHIP-TRUCK was developed using global positioning system (GPS) data from chip trucks that were transporting chipped biomass from forest operation sites on steep, single-lane roads. The model was developed based on maximum limiting speeds on a road segment as constrained by road grade, stopping sight distance, road alignment, and changes in driver behavior as road conditions transitioned. A two-pass simulation was used; the first-pass simulation calculated the maximum limiting speeds on each road segment and a second pass simulated driver speed adjustment between segments. Four cases were identified to emulate driver behavior to determine whether a driver will accelerate, decelerate, or continue at current speed. Acceleration and deceleration rates were determined through an optimization procedure that minimized deviations between observed times and modeled times. The model's accuracy for predicting travel time depended on acceleration and deceleration rates. An acceleration rate of 1.5 ft/second2 and deceleration rate of 9.5 ft/second2 gave the best fit for a loaded chip truck. These modeled travel times were within 5% of the observed times and represented an average speed of 19 miles per hour (mph). For an unloaded chip truck, an acceleration rate of 1.5 ft/second2 and deceleration rate of 6.5 ft/second2 gave the best fit. The modeled travel times for unloaded chip trucks were within 5% of the observed times with an average speed of 22 mph. CHIP-TRUCK can benefit operation managers in transportation planning applications involving steep terrain.
- Subjects
BIOMASS &; the environment; BIOMASS production; FOREST biomass; FOREST roads; FORESTS &; forestry
- Publication
Forest Science, 2015, Vol 61, Issue 4, p763
- ISSN
0015-749X
- Publication type
Article
- DOI
10.5849/forsci.14-059