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A procedure for simulating the dynamics of agricultural and forestry machines using mechanical system simulation software is presented. A soil/track interface model including rubber-track and steel-track was introduced as well as equations that can be used to model mechanical and hydraulic power trains commonly found in tracked vehicles. Two rubber-tracked vehicles (agricultural tractors) and two steel-tracked machines (forestry vehicles) were simulated to illustrate the technique, and some analysis results are presented. The examples given in this paper are based on the author’s research over the past several years.

Fluid power is used extensively in forestry equipment with some novel applications of hydraulics to fell, move and process logs and trees. Hydraulic components undergo rugged use under severe conditions, over long periods of minimal maintenance. Selected hydraulic designs are illustrated and discussed. Design features for service requirements on forestry equipment are detailed.