An investigation of the tractive performance of agricultural tractors : A thesis presented in partial fulfillment [sic] of the requirements for the degree of Master of Engineering in Agricultural Engineering in the University of Canterbury [Lincoln College], Christchurch, New Zealand

Abstract

Various methods proposed for predicting tractor field performance are examined. The effects of tractor and soil characteristics on overall tractive performance are investigated. A scale model tractor was tested in a laboratory soil-bin under carefully controled conditions in a variety of configurations. The relative usefulness of performance parameters and different types of curves is analysed. A computer simulation model is developed to predict tractor field performance covering a wide range of input variables. The model provided valuable information applicable to tractor design, selection of exisiting tractors and the choice of ballast. Once minor modifications have been made the computer model can be used as a decision-making aid for farmers and extension personnel in predicting the performance of the tractor-implement combinations for a range of farm situations.