Pattern forecasting of performance indices for air-and-screen cleaner from chaffing efficiency rise

The interrelation of the chaffing process efficiency growth and the air-screen grain-cleaner performance indices is considered. A mathematical functional model of the air separator and the screen cleaner is described as a closed-loop quasi-static system. Agronomical performance indices of the machine are accepted as criteria. Through variation of the delivery, technological properties of the basic material and of the completeness of each component separation, the rational values of the control factor arguments are revealed, the numerical results of the grain loss magnitude, completeness of the foreign and other grain separation, as well as their content in the purified material, are determined. The developed mathematical model of the heterogenic granular medium chaffing allows - through the known parametric and structural synthesis methods - conducting a multivariate analysis of the process and evaluating the air separator rational parameters for the specified conditions and the restrictions to its performance indices. As a result of modeling, a trend of the index variation of the machine performance and their interrelation is revealed. The obtained results have shown a significant increase in productivity and technological parameters of the similar machine performance from the efficiency growth of their air separator.