DEVELOPING OF A HUMAN POWER UNIT

Abstract

This investigation was mainly carried out to develop a power unit using the human power prone cart suitable for small farms. The function designs the power unit is using the human power to provide job opportunities for youth that it made with young men in three systems. This power unit was tested in two soil surface paved and unpaved rods. The experiments were done under four studied parameters namely three reduction ratio (1: 2.5, 1: 3.5 and 1: 4.5), traction mass (25, 50 and 75 kg in unpaved and in paved road were 75, 100 and 125 kg), the drawbar height (30, 35 and 40 cm), tire inflation pressure (1.0, 1.5 and 2.0 bar). To evaluate the performance of the designed unit, the forward speed, slippage, rolling resistance were investigated. From this study it was found that the optimum values were forward speed 2.565 km/hr, slippage1.137 % and draw bar pull 55kg on paved road. On unpaved road the optimum values of forward speed 1.844 km/hr, slippage 3.255 % and drawbar pull 60 kg.