Mekanisme Penangkap Tandan Buah Sawit dan Pemanfaatan Energi Potensialnya

In oil palm harvesting, falling fruit bunches have a considerable potential energy, which can be captured and used to power the wheelbarrow in evacuating the fruit bunches. This study was conducted to design a mechanism of oil palm fresh fruit bunches catchment and its potential energy utilization. The potential energy of falling fruit bunches during oil palm harvesting that stored in the flat spiral spring, and used to drivethe wheelbarrow. The actual energy potential and torque performance of flat spiral spring was measured by using a torque and potential energy measuring apparatus. The results showed that the potential energyfrom falling fruit bunches could store in the flat spiral spring mechanism, with storage efficiency of 39.39%. By means of 1.5 rotation of flat spiral spring, the maximum torque of the flat spiral spring was 53.35 Nm.The utilization of potential energy that stored in the flat spiral spring has been successfully used to drive the wheelbarrow, with utilization efficiency of 80.39%. By using the potential energy of 38.64 J, wheelbarrow could move as far as 0.41 m to evacuate 48 kg of total weight loads

Desain Konseptual Penangkap Tandan Buah Sawit dan Pemanfaatan Energi Potensialnya

In oil palm harvesting, falling fruit bunches have a considerable potential energy, which can be captured and used to power the wheelbarrow in evacuating the fruit bunches. This study was conducted to measurethe engineering characteristics of fruit bunches harvesting, determine the best fruit bunches catchment platform material, analyze the potential energy of falling fresh fruit bunch, and design a conceptual designof the catchment platform and evacuation machine. Measurements of the characteristics of the harvesting were done in an oil palm plantation. Four types of fruit catchment platform materials were tested, namely:steel plate, wood board, expanded steel plate and rubber sheet. The results showed that, bunches fell at a distance between 0.6 m to 1.4 m from the tree. Fruit bunches weight was in the range of 16 kg to 32 kg.The rubber catchment platform was superior to the other materials in reducing the scattered loose fruits and bruised fruits. Potential energy of falling fruit bunches were in the range of 0.44-4.44 kJ. Theoreticaltraveling distance of the wheel barrow powered by the captured potential energy was in the range of 2.27 m - 22.98 m. Based on the data obtained, a conceptual design of catchment platform and evacuation machinewas designed

Strategy of Soybean Management (Glycine Max L.) to Cope with Extreme Climate Using CropSyst© Model

This research was carried out to verify the CropSyst© plant model from experimental data in a soybean field and to predict planting time along with its potential yield. The researches were divided into two stages. First stage was a calibration for model on field from June to September 2015. Second stage was the application of the model. The required data models included climatic, soil and crop\u27s genetic data. There were relationship between the obtained data in field and the simulation from CropSyst© model which was indicated by 0.679 of Efficiency Index (EF) value. This meant that the CropSyst© model was well used. In case of Relative Root Mean Square Error (RRMSE), it was shown at 2.68 %. RRMSE value described that there was a 2.68 % error prediction between simulation and actual production. In conclusion, CropSyst© can be used to predict the suitable planting time for soybean and as the result, the suitable planting time for soybean on the dry land is the end of rainy season (2 June 2015). Tanggamus variety is the most resistant variety based on slow planting time, because the decreased percentage of production was lower (8.3 %) than Wilis (26.3 %) and Anjasmoro (43.0 %)