Influence of the speed on soil-pressure over a plough

During ploughing work wear is generated by the interaction between tillage tool and soil. Wear rate on tillage tools is mostly affected by soil-tool pressure distribution and it compromises plough functionality during its life cycle. In this paper, a methodology to measure and analyse pressure signals on a plough has been developed and the influence of the speed was investigated. Field tests were carried out with a four-furrow plough and the pressure on 10 different points was measured with tactile sensors. The plough was tested on a silty-clay-loam soil at three different speeds. The analysis of the results shows that pressure signals are close to zero for a range from 14 up to 92% of the travelled distance and short spikes frequently occur. This behaviour can be explained by the granular structure of soil that determines a non-constant contact between the soil and tool in some points. Spike patterns are markedly affected by the speed especially in terms of the number of spikes and their distribution. Moreover, the mean pressure quadratically varies with the speed in mouldboard (MBL) and ploughshare (PS) while on wear plate (WP) no influence was found because this part is parallel to the ploughing direction. The methodology and the results introduced in this paper will be useful for the validation of mathematical models to simulate the ploughing process but also, to improve the comprehension of the soil cutting process.

[1]  Edward McKyes,et al.  Soil Cutting and Tillage , 1986 .

[2]  Richard J. Godwin,et al.  A review of the effect of implement geometry on soil failure and implement forces , 2007 .

[3]  Y. Bayhan,et al.  Reduction of wear via hardfacing of chisel ploughshare , 2006 .

[4]  Michele Mattetti,et al.  New methodology for accelerating the four-post testing of tractors using wheel hub displacements , 2015 .

[5]  Richard J. Godwin,et al.  Soil Failure with Narrow Tines , 1977 .

[6]  Anthony R. Dexter,et al.  Methods for predicting the optimum and the range of soil water contents for tillage based on the water retention curve , 2001 .

[7]  Robert Hamilton,et al.  Simulation of soil–blade interaction for sandy soil using advanced 3D finite element analysis , 2004 .

[8]  Richard J. Godwin,et al.  Integrated soil tillage force prediction models , 2007 .

[9]  Won Young Yang.  Signals and Systems with MATLAB , 2009 .

[10]  I. Shmulevich,et al.  Interaction between soil and a wide cutting blade using the discrete element method , 2007 .

[11]  Michele Mattetti,et al.  Methodology to analyse farm tractor idling time , 2016 .

[12]  William R. Gill,et al.  Soil dynamics in tillage and traction , 1967 .

[13]  Chris Saunders,et al.  A force prediction model for mouldboard ploughs incorporating the effects of soil characteristic properties, plough geometric factors and ploughing speed , 2007 .

[14]  Abdul Mounem Mouazen,et al.  Tillage Tool Design by the Finite Element Method: Part 1. Finite Element Modelling of Soil Plastic Behaviour , 1999 .

[15]  S. Košutić,et al.  Reduction of mouldboard plough share wear by a combination technique of hardfacing , 2008 .

[16]  J. A. Weber,et al.  Soil Failure and Pressure Patterns tor Flat Cutting Blades , 1971 .

[17]  Subrata Karmakar,et al.  Dynamic modeling of soil–tool interaction: An overview from a fluid flow perspective , 2006 .

[18]  Itzhak Shmulevich,et al.  State of the art modeling of soil–tillage interaction using discrete element method , 2010 .

[19]  W. Arnold,et al.  Finite element simulation of moldboard–soil interaction , 2013 .

[20]  Michele Mattetti,et al.  Field performance of an agricultural tractor fitted with rubber tracks on a low trafficable soil , 2015 .

[21]  D. S. Shrestha,et al.  Optimizing design parameters of a mouldboard plough , 2001 .

[22]  A. R. Reece,et al.  Symmetrical three-dimensional soil failure , 1967 .

[23]  T. Niyamapa,et al.  Force and pressure distribution under vibratory tillage tool , 2000 .

[24]  Chris Saunders,et al.  Three-dimensional discrete element modelling of tillage: Determination of a suitable contact model and parameters for a cohesionless soil , 2014 .

[25]  S. Ward,et al.  Characteristic loading of light mouldboard ploughs at slow speeds , 1996 .

[26]  P. Swanson.  Comparison of Laboratory Abrasion Tests and Field Tests of Materials Used in Tillage Equipment , 1993 .

[27]  George Papadakis,et al.  The Influence of Soil Type, Soil Water and Share Sharpness of a Mouldboard Plough on Energy Consumption, Rate of Work and Tillage Quality , 1999 .