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The traction forces can be determined theoretically with different relations, or they can be measured in field with different implements. The collective of Technical Sciences and Soil Sciences, from the Faculty of Agriculture has developed a system for measuring traction forces of agricultural machines in field operation. This system will be able to measure the traction forces for different agricultural machines in different soil conditions up to 50 kN. Aims: This paper presents how the system is made and methods for sensor calibration for forces measurement. The system will be capable of determining the value of longitudinal forces (Fx), vertical forces (Fz) and transversal forces (Fy). Materials and Methods: For measuring the traction forces, the system has two steel frames which are mounted between the tractor and the agricultural machine. Those two frames are linked together by six HBM S2/S9 force transducers: three for longitudinal forces, two for vertical forces and one for transversal forces (rotation moment is created between two frames). All six force transducers are connected to a data acquisition device SPIDER8 which is an electronic measuring system for PCs for electronic measurement of mechanical variables. Results: The measuring system with two frames was developed at Technical Sciences, from theÂ  Faculty of Agriculture, regarding shape, size and materials. The execution of frames will be made in collaboration with SC Tehnofavorit BonA£ida SRL. The size of frames was established to fit a wide range of tractors and agricultural machines with 3 different point hitch sizes. Â For calibrating the force transducers we used a hydraulic stand. Each force transducer was mounted on a stand, tensioned and compressed to measure the forces range. After this calibration, it resulted that all six forces transducers respect the manufacturer prescriptions (0-50 kN) and can be used to measure in field operations. Conclusion: Equipment for in field measuring of traction forces during soil tillage was developed to measure and evaluate tractor and tillage tools' parameters. The measuring system has two steel frames and six force transducers which were calibrated for in field operations. Â

DEVELOPMENT OF AN EQUIPMENT FOR IN FIELD MEASURING OF TRACTION FORCES DURING SOIL TILLAGE