OpenFields

Force measurement between a tractor and a three point linkage mounted cultivation implement.

This paper evaluates different three point linkage force measurement systems and considers the design and implementation of a category I strain gauged linkage.

Year of Publication2009

Implement force measurement is required as part of a system to determine the tractive performance when using a three point linkage mounted cultivation implement. An instrumented three point linkage (measuring the tension/compression in the top link, lift rods and lower lift arms and the angle of the lift arms) has been developed to allow calculation of an implement draught force, its vertical force (weight addition), resultant force and its line of action in the longitudinal vertical plane. From the tractor and implement kinematics and the static axle loads the dynamic wheel loads can be calculated. This paper evaluates different three point linkage force measurement systems and considers the design and implementation of a category I strain gauged linkage. The accuracy and sensitivity of the instrumentation is discussed and the effect of vehicle attitude and tyre deflection and wheel sinkage are also considered. Example field test data is included in the evaluation.

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Additional keywords/tags

tractor dynamicstractor kinematicstractive efficiencyimplement force predictioninstrumented linkage
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Supporting the development of the national rural economy.

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