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A software using the Finite Element Method for machine-soil system was developed with the following features: (1) an iterative increment algorithm for solving dynamic problems with material non-linearity; (2) five strategies for reducing program running time; (3) strategies to utilize the computer memory resources under DOS environment; (4) a complete macro-command system; and (5) an advanced element-library managing structure.

Field tests in sandy loam and clay soils were conducted with simple vertical tillage tools up to a speed of 18 ms-1 (65 km h-1) to determine the influence of soil types on the high-speed performance of tillage tools and the detailed relationship between draft and speed. A non-linear, dynamic finite element method (FEM) was used to simulate the variation in tool draft witii cutting speed. The prospects of high-speed tillage were discussed on tie basis of these experimental and analytical results.