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All Journal Dinamika Teknik Mesin : Jurnal Keilmuan dan Terapan Teknik Mesin
Nuarsa, I.M.
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Aerospace Engineering Automotive Engineering Mechanical Engineering Physics

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Pengeringan biji jagung menggunakan pengkondisi udara Mulyanto, A.; Mirmanto, M.; Susana, I.G.B.; Alit, I.B.; Nuarsa, I.M.
Dinamika Teknik Mesin: Jurnal Keilmuan dan Terapan Teknik Mesin Vol 9, No 1 (2019): Dinamika Teknik Mesin: Jurnal Keilmuan dan Terapan Teknik Mesin
Publisher : Universitas Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (352.891 KB) | DOI: 10.29303/dtm.v9i1.262

Abstract

This study aims to determine the effect of air velocity on the rate of drying corn. Corn seeds were placed after the evaporator of an air conditioner, so that the air came out of the evaporator entered the drying chamber. The water in the corn was evaporated and sucked by dry cold air and then it was condensed in the evaporator. The results show that the mass of corn seeds decreases with the time; the drying rate also decreases with the time and mass-based drying rates at low air speeds are faster than at high air speed. The air conditioner can be used for drying seeds.
Penurunan konsumsi bahan bakar pada mesin bensin 4 langkah 1 silinder dengan menggunakan medan magnet elektomagnetik Mara, I.M.; Alit, I.B.; Nuarsa, I.M.
Dinamika Teknik Mesin: Jurnal Keilmuan dan Terapan Teknik Mesin Vol 11, No 1 (2021): Dinamika Teknik Mesin: Jurnal Keilmuan dan Terapan Teknik Mesin
Publisher : Universitas Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (252.598 KB) | DOI: 10.29303/dtm.v11i1.374

Abstract

The quality of gasoline fuel is very important; therefore scientists are trying hard to improve the quality of this fuel. One of them is treating the fuel before it enters the combustion chamber or before experiencing the combustion process. The use of permanent magnets can reduce fuel consumption, and reduce exhaust emissions. This study aims to investigate the reduction of fuel consumption of a single-cylinder four-stroke gasoline engine by using electromagnetic field. Diameter and length of the copper wire used are 0.7 mm and 80 meters. The effect of the magnetic field on the engine performance was observed at various engine speed, such as 1500, 3000, 4500 and 6000 rpm. The results showed that the electromagnetic of solenoid winding reduced the specific fuel consumption. The percentage of reduction in the specific fuel consumption is 18.93%.
Analisis emisi gas buang kendaraan berbahan bakar etanol Mara, I.M.; Nuarsa, I.M.; Alit, I.B.; Sayoga, I.M.A.
Dinamika Teknik Mesin: Jurnal Keilmuan dan Terapan Teknik Mesin Vol 9, No 1 (2019): Dinamika Teknik Mesin: Jurnal Keilmuan dan Terapan Teknik Mesin
Publisher : Universitas Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (598.052 KB) | DOI: 10.29303/dtm.v9i1.258

Abstract

Exhaust emissions of motorcycles are very harmful to the environment and to human health. Ethanol is an alternative fuel that can be used to substitute gasoline. Ethanol can be obtained from the fermentation of agricultural products that contain carbohydrates. Ethanol is a clean fuel and has high octane number so it produces less harmfull exhaust emission. In this research, a single cylinder four-stroke gasoline engine of Honda Astrea Legenda 100 cc was used to examine the fuel consumption and exhaust emission gas by varying the ignition timing (15o, 20o and 25o) before TDC and engine rotation (1500, 2500, 3500, 4500, and 6000 rpm) at the entire transmission gear (N, 1, 2, 3 , and 4) using ethanol 96% fuel. The results show that there is a reduction in the fuel consumption and exhaust emissions such as CO, HC and increase the levels of CO2 emissions by using ethanol 96% fuel at 20° before TDC ignition timing. Moreover, the lowest fuel consumption value is achieved at the ignition timing 20º before TDC at the engine speed 1500 rpm at transmission gear 4 that is 0.1 kg/h. In addition, the lowest CO emission value is 0.17 % volume at 6000 rpm engine rotation with transmission gear 4, the lowest HC emission value is 57, 67 ppm at 6000 rpm engine rotation with transmission gear 4 and the highest CO2 value is 13.86 % volume at 6000 rpm rotation with transmission gear 4.
Pengaruh variasi ketebalan saluran dan temperatur tuang terhadap fluiditas dan porositas hasil pengecoran kuningan pada pengecoran evaporatif Sugita, I.K.; Mara, M.; Priambadi, I.G.N.; Nuarsa, I.M.
Dinamika Teknik Mesin: Jurnal Keilmuan dan Terapan Teknik Mesin Vol 13, No 1 (2023): Dinamika Teknik Mesin: Jurnal Keilmuan dan Terapan Teknik Mesin
Publisher : Universitas Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/dtm.v13i1.627

Abstract

The development of foundry technology continues to grow along with the increasingly complex needs for making products based on art and culture, one of which is sclupture. Evaporative casting based on non-permanent patterns made of polystyrene foam, with the advantage of precision casting results in complex shapes. The purpose of this study was to determine how variations in the pouring channel and pouring temperature affect the fluidity and porosity of brass castings in evaporative casting. Casting was carried out in castings with thicknesses of 1.5, 2, 3, 4, and 5 mm at pouring temperatures of 900°C, 950°C, and 1000°C using brass with a composition of Cu60% and Zn40%. The highest fluidity was found at a pattern density of 0.012 gr/cm3 at a pouring temperature of 1000°C with a flow length of 150 mm, while the lowest fluidity was obtained at a pattern density of 0.016 gr/cm3 at a pouring temperature of 900°C with a flow length of 13 mm. The results of scanning electron microscope (SEM) observations can be observed in spesimens with a density of polystyrene foam and a high casting temperature, an increase in the porosity formed.
Experimental study of the effect of load and vehicle speed on energy consumption of electric vehicles, Faculty of Engineering, University of Mataram Mara, I.M.; Tira, H.S.; Rachmanto, T.; Nuarsa, I.M.
Dinamika Teknik Mesin Vol 15, No 2 (2025): Dinamika Teknik Mesin: Jurnal Keilmuan dan Terapan Teknik Mesin
Publisher : Universitas Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/dtm.v15i2.1111

Abstract

The use of electrical energy for vehicles is currently very relevant because its efficiency is relatively high and is environmentally friendly, due to, it does not emit exhaust gases emission. Indonesia has a huge potential to develop electric vehicles because there is a lot of nickel available to be processed into batteries. However, it is necessary to consider the level of energy use of the electric vehicle that will be made. How much does speed influence the use of electrical energy, or at what speed does an electric vehicle provide the greatest efficiency in energy use. This research is intended to study how much vehicle speed influences energy consumption and also to obtain the vehicle speed range with the lowest energy use efficiency in autonomous electric vehicles, Faculty of Engineering, University of Mataram. The lowest energy consumption occurs at a speed of 20 km/h with a load of 960 kg, which is 0.173 kWh/km. The most efficient speed for distance traveled per kWh is 30 km/h, regardless of vehicle weight. A speed of 40 km/h decreases efficiency, especially with a heavier load, while increasing the load at lower speeds (20 km/h and 30 km/h) does not significantly reduce efficiency, and even slightly increases the distance traveled.
Pengeringan biji jagung menggunakan pengkondisi udara Mulyanto, A.; Mirmanto, M.; Susana, I.G.B.; Alit, I.B.; Nuarsa, I.M.
Dinamika Teknik Mesin Vol 9, No 1 (2019): Dinamika Teknik Mesin: Jurnal Keilmuan dan Terapan Teknik Mesin
Publisher : Universitas Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/dtm.v9i1.262

Abstract

This study aims to determine the effect of air velocity on the rate of drying corn. Corn seeds were placed after the evaporator of an air conditioner, so that the air came out of the evaporator entered the drying chamber. The water in the corn was evaporated and sucked by dry cold air and then it was condensed in the evaporator. The results show that the mass of corn seeds decreases with the time; the drying rate also decreases with the time and mass-based drying rates at low air speeds are faster than at high air speed. The air conditioner can be used for drying seeds.
Penurunan konsumsi bahan bakar pada mesin bensin 4 langkah 1 silinder dengan menggunakan medan magnet elektomagnetik Mara, I.M.; Alit, I.B.; Nuarsa, I.M.
Dinamika Teknik Mesin Vol 11, No 1 (2021): Dinamika Teknik Mesin: Jurnal Keilmuan dan Terapan Teknik Mesin
Publisher : Universitas Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/dtm.v11i1.374

Abstract

The quality of gasoline fuel is very important; therefore scientists are trying hard to improve the quality of this fuel. One of them is treating the fuel before it enters the combustion chamber or before experiencing the combustion process. The use of permanent magnets can reduce fuel consumption, and reduce exhaust emissions. This study aims to investigate the reduction of fuel consumption of a single-cylinder four-stroke gasoline engine by using electromagnetic field. Diameter and length of the copper wire used are 0.7 mm and 80 meters. The effect of the magnetic field on the engine performance was observed at various engine speed, such as 1500, 3000, 4500 and 6000 rpm. The results showed that the electromagnetic of solenoid winding reduced the specific fuel consumption. The percentage of reduction in the specific fuel consumption is 18.93%.
Co-Authors A. Mulyanto I Gede Bawa Susana I.B. Alit, I.B. M. Mirmanto, M. Mara, I.M. Mara, M. Priambadi, I.G.N. Rachmanto, T. Sayoga, I.M.A. Sugita, I.K. Tira, H.S.