Abstract
Combine harvester is the most widely used modern forest machinery; tracked and wheeled logging machine is the common stumper. But each type of logging machine has its shortcomings and therefore it is need to develop a combination of tracked and wheeled logging machine. This logging mechanism takes the form of tracked feet while preserving the flexibility of wheeled logging machine, and also it has the obstacle-crossing ability of tracked harvester. The most important indicator of the performance of this new logging machine is its trafficability in soft and uneven road. This thesis uses multi-body dynamic simulation analysis software RecurDyn to build up the 3D model of such four feet tracked logging machine, and analyzes its dynamical process when meeting ditch. Eventually the logging mechanism performance is got. The conclusions provide foundation for design of combined harvester with four tracked feet.
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