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The prediction of the force and energy requirements to fill soil engaging buckets

Published by the American Society of Agricultural and Biological Engineers, St. Joseph, Michigan

Citation:  Paper number  131619599,  2013 Kansas City, Missouri, July 21 - July 24, 2013. (doi: @2013
Authors:   Richard J Godwin, Paula A Misiewicz, David R White, Tom Underhill
Keywords:   energy to fill a bucket General Soil Mechanics Equation Mohr Coulomb Equation prediction model soil engaging bucket

Abstract. The aim of this paper is to investigate if the force and energy requirements of soil engaging buckets can be predicted using classical Mohr-Coulomb soil mechanics principles by the extension and adaption of the General Soil Mechanics Equation. The longer term aim is to help design engineers improve the efficiency of buckets without compromising their durability. A model of a complete bucket was developed by modelling the forces arising from the toe plate and side cutters from the initiation of the cut through to a complete fill. The predicted forces and energy requirements were compared to the results from studies using nominally 0.6m wide buckets of various geometries in a sandy loam and pure sand in controlled conditions at Harper Adams University. The bucket forces were measured using a multi-dynamometer suspension rig attached to the horizontal boom of a telescopic material handling machine. The latter gave the ultimate in operating adaptability for use in both laboratory and field conditions.

The overall results of the study showed that the Mohr-Coulomb prediction models produced estimates within 1.1% and 1.35% of the total bucket force and the total energy to fill the bucket, respectively. Individual variances between the predicted and measured values were less than 10% for both the force and energy requirements.

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