http://hdl.handle.net/1957/26311 2013-05-20T08:46:23Z http://hdl.handle.net/1957/26312 Computer simulation of offtracking of truck and trailer combinations using forest roads Erkert, Thomas W. Many of the analytical techniques that are currently available are not capable of analyzing the offtracking of truck and trailer combinations or the path of load overhangs through a set of curves that are commonly found on forest roads. Advances in the processing speed of microcomputers have made it possible to simulate how a truck and trailer combination negotiate a road. A microcomputer program, OFETRACK, was developed to simulate the offiracking of six different vehicle configurations. The program will enable road designers to predict offtracking through a complex set of road geometrics, including compound and reverse curves. The program will also analyze the path of load overhangs on a vehicle such as a yarder tower on a lowboy or rubber tired undercarriage, Test results of the program compare favorably with several field studies and a scale model simulator. Outputs of the computer simulation are in the form of road widths required left and right of centerline, total width, and curve widening, A plot of the paths of the wheels and load overhang can be viewed on the screen or sent to a drum plotter 1989-06-01T00:00:00Z