| Dynamic friction coefficients of agricultural crops are applied in designing silos, agricultural crops storage structures, transporting, handling machines and discharging implements. In this study, at first an apparatus for measuring dynamic friction force was developed, then the dynamic friction coefficient of common wheat varieties at five levels (Azar2, Rasad, Sardari, Zagros, Sabalan) were investigated on contact surface at four levels (black, galvanized, mild and aluminum sheets), with sample slipping speed at three levels (5, 10 and 15 cm s-1) and grain moisture content at three levels (12%, 14% and 18% w. b.). The data were analyzed probability. The obtained results revealed that the main effects of all independent factors as well as the double... |
