Abstract
Box and Behnken Design employed response surface methodology to characterize the performance of the peg-tooth type threshing cylinder. Independent variables include the number of peg-tooth, threshing cylinder speed, and concave clearance. Response variables were threshing recovery, threshing cylinder efficiency, and the amount of mechanically damaged grain. The statistical software Design Expert ® developed mathematical models that had a good fit of actual and predicted responses. Numerical optimization revealed that the best operating conditions were 36 peg-teeth, 830 to 840 rpm threshing cylinder speed settings, and 15 mm concave clearance. Models were validated and found 99.66%, 99.59%, and 93.81% accurate for predicting threshing recovery, threshing cylinder efficiency, and amount of mechanically damaged grain, respectively.
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