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Articles by Refik Polat
Total Records ( 3 ) for Refik Polat
  Refik Polat , Metin Guner , Ergin Dursun , Dogan Erdogan , Ibrahim Gezer and H.I. Cem Bilim
  An inertia type limb shaker were developed to mechanically harvest of tree fruits. The shaker, hydraulically powered and driven by the tractor power take off, was used for mechanical harvesting of almond. The study included optimum frequency and amplitude to obtain maximum fruit removal percentage, harvesting rate of the shaker. Harvesting rate was calculated by weighing both the harvested and unharvested almonds. In the tests the limbs of trees were shaken at 40 and 50 mm amplitude of the connecting rod attached to the crankshaft and 10, 15, 20 Hz frequencies. The results were analysed according to the maximum fruit removal percentage. Shaking time was 10 s for all of the frequency and amplitude tests. Maximum fruit removal (97 and 100%) was achieved by operating the shaker at amplitude of 50 mm and a frequency of 15 and 20 Hz. Therefore it can be suggested an amplitude of 50 mm and a frequency of 20 Hz for mechanical harvesting of almond. Moreover, the appropriate harvesting time for nonpearl variety of almond was found the second week of August. Because, the ratio of Fruit Detachament Force (FDF) to Weight (W) at different maturity times was found 1.8 N/g at the second week of August.
  Refik Polat , Umran Atay and Cevdet Saglam
  Some physical and aerodynamic properties of soybean were determined in order to design processing equipment and facilities. In this study, some physical properties of soybean were evaluated as a function of moisture content in the range of 6.7-15.3% (db). At the 6.7% (db) moisture content the average length, width, thickness, unit mass, the geometric mean diameter, arithmetic mean diameter, sphericity, porosity, true and bulk density soybean were 7.41 mm, 5.34 mm, 4.50 mm, 121.76 g, 5.62 mm, 5.75 mm, 75.0, 51.0, 062.6 and 804.8 kg m-3, respectively. Corresponding values at 15.3% (db) moisture content were 9.57 mm, 6.75 mm, 5.17 mm, 23.65 g, 5.62 mm, 5.75 mm, 72.0%, 4.2%, 1086.4 and 689.3 kg m-3, respectively. In soybean, terminal velocity increased from 7.13 to 9.24 m sμ-1 and the coefficient of static friction increased linearly against all the tested surfaces as the moisture content increased.
  Refik Polat , Bekir Erol Ak and Izzet Acar
  This study was performed with the objective to investigate the work process, work capacity, work effectiveness, energy consumption and labor force requirements of basic units such as washing, dehulling, sorting, separating, roasting and packing in a pistachio processing plant which has been mechanized in the last years. As a result of this study, the work capacity in washing, sorting, breaking, drying, separating units was found to be 1.5, 1.5, 2, 1, 1.6 t h-1, respectively. The work effectiveness in sorting and breaking units was found to be 95% and that of separating unit was 99%. The total energy consumption of the units was found to be 20.42 kW h-1 and the total labor force requirement was found to be five workers.
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