Evaluation of five traction models for agricultural tractors in Colombia

Bernardo Castillo


The behavior of traction devices of agricultural tractors has been modeled by analytical techniques and through the use of empirical equations, the latter methodology has shown good results and numerous applications. This article presented the evaluation of four empirical traction models and one semi-empirical in order to establish the model that best fit to Colombian agricultural soil mechanization and to propose a tool that better assess the traction behavior of tractors in the field. Taking into account all terrains conditions evaluated, the model that best adjusted was the Gee-Clough and collaborators model and it was possible to explain the 90% of the draft forces measured. Also the model of Evans and others, using improved prediction coefficients of Deere Group Research model, which fit in soils with vegetable cover, got a coefficient of determination of 94% in draft forces estimation under these conditions. All comparable observations were made with tractors in 2WD (two wheel drive) mode, it was suggested that tests with tractors in 4WD (four wheel drive) mode should be run.


traction; empirical models; tractors; soils; mechanization.

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