Vegetable oil is biodegradable, non-toxic, environmentally friendly, and renewable so that it becomes an alternative to replace mineral oil and chemicals. This research will develop a bioresin which is a mixture of epoxy with natural polymer such as palm oil. The homogenization method uses a hot plate so that the mixing reaches miscible materials. The results of bioresin testing with variations in the composition of palm oil showed that the optimal composition variation was E-MS (10%) because it had a low tensile strength value of 53.111Mpa. While the highest elongation value is 14.04767%, and has a low hardness value of 86.3 on the shore D scale. The highest density value is 1.25254(g/cm3). Judging from the standard L'loyd Register and BKI (Indonesian Classification Agency) that the values of all tensile strength test results meet the standards and all variations in the composition of the test results and elongation values meet the minimum criteria.
Lube oil cooler serves to lower the temperature of the lub eoil in the gas turbine lubrication system. The problem that often occurs is the oil exit temperature is still high. This causes process failure in the lubrication system because the working temperature exceeds the allowable temperature. This failure is caused by non-uniformity flow distribution of the lube oil cooler. Therefore, further studies are needed to improve the uniformity of flow distribution. To increase the uniformity of flow, modification of the shape of the inlet header and variations of the lubricating oil capacity on the performance of the lubricating oil cooler were carried out. The research method used is numerical simulation with ANSYS FLUENT software. The simulation is carried out in 3 dimensions with a turbulence model in the form of k-ε RNG using a pressure based solution solver. Making geometry and design specifications using GAMBIT software. Geometric data is the dimensions of the lubricating oil cooling system and data from previous studies. The simulation is carried out in the form of a base line header with a modification of the inlet header, namely a multi-step blocker with variations of the Reynolds Number of 3088, 5146, and 7616. Based on the results of numerical simulations that have been carried out, the lowest Non-uniformity flow rate is at Re = 3088 sebesar, Ф = 0.01594, Exit Temperature 76.620 oC, and Pressure Drop 639.265 N/m2.
Ketersediaan bahan bakar fosil berbanding terbalik dengan pertumbuhan jumlah kendaraan bermotor. Penggunaan kendaraan bermotor yang menggunakan bahan bakar fosil seperti minyak juga menyebabkan peningkatan polisi udara oleh emisi gas buangnya. Oleh karena itu, banyak dilakukan pengembangan alat transportasi yang ramah lingkungan. Sepeda motor listrik menjadi salah satu alat transportasi yang banyak dikembangkan. Dengan menggunakan motor Brushless Direct Current (BLDC), sepeda motor listrik ini memiliki efisiensi yang tinggi dalam mengubah energi listrik menjadi energi mekanik. Penelitian ini difokuskan pada kontrol kecepatan sepeda motor listrik dengan Field Oriented Control, dimana algoritma ini dapat mengendalikan motor BLDC dengan mengontrol torsi dan flux secara terpisah sehingga diharapkan efisiensi motor akan lebih baik. Hasil penelitian menunjukkan bahwa kecepatan motor dapat dikontrol dengan akurasi lebih dari 99 persen.
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