PAPER TITLE :A COMPUTER-BASED SENSITIVITY ANALYSES OF THE PERFORMANCE OF AN INDIGENOUS COMBINE HARVESTER

JOURNAL Of SUSTAINABLE TECHNOLOGY | VOLUME 2 NUMBER 11 2011

Paper Details

  • Author(s) : OLUKUNLE, O.J. ABIODUN, B.J. and OGUNTUNDE, P.G
  • Abstract:

Harvesting operation using the combine is a precision activity requiring optimum settings based on crop, machine and operational data. The sensitivity of these parameters requires proper investigation due to their impact on the harvesting process and farmer’s income. This paper reports development of an interactive computer programme for estimating losses in an indigenous cowpea combine harvester based on regression models developed from previous studies. The programme reads the values of the various input parameters such as crop variety, grain moisture content(GMC), combine forward speed(CFS), stripper speed(RS) and feed rate (FR) and apply the various equations to compute output which include % shatter losses , % unstripped losses, total losses, threshing efficiency, grain  damage and cleaning efficiency. The package was tested with values of input parameters on  Ife Brown and IT 716 cowpea varieties within the range of values  adjudged optimum from field experiments and  literatures.  Results of typical interface with the programme show that shatter losses were higher in Ife brown than IT 716 cowpea varieties for all the test conditions. At a stripper speed of 100 rpm, grain moisture content of 17.0% wet basis (wb) and forward speed of 3 km/h, shatter losses was 6.64% in Ife Brown, but 4.91% in IT 716. At a feed rate of 600 g/s, concave clearance of 13 mm and grain moisture content of 17.0% wet basis, grain damage increased from 6.43% to 16.50%  and from 9.50%  to 18.38% in IT 716 and Ife Brown respectively as the cylinder peripheral speed increased from 100 rpm to 500 rpm. The programme is user friendly and offers opportunities to the farmers and combine operators to predict combine performance apriori