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PENENTUAN KUALITAS PELUMASAN MESIN Fajar, Rizqon; Yubaidah, Siti
MESIN Vol 9, No 1 (2007): Bahan Bakar Alternatif
Publisher : Program Studi Teknik Mesin, Universitas Trisakti

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The monitoring on commercial engine lubricants have resulted that the properties ofmost lubricants (synthetic, semi synthetic and mineral type) have met the requirements specifiedforcommon engine oil. However, significant variations have been found in the properties such asviscosity, viscosity index and additive contents (anti oxidant &detergent). Too high in viscosity willgive difficulty during engine staring and increases the fuel consumption. Meanwhile if the viscosity istoo low this will create more risks for engine damage (metal to metal contact). Some of the samplesfrom synthetic, semi synthetic and mineral lubricants have shown that the additives contents (antioxidant, antiwear anddetergent) are too low. Lower additive contents means that the service life ofthelubricants will be shorter than the usual recommendation. Most of mineral lubricants are too highviscosity at normal temperature of engine operation (lOffC). This will decrease the efficiencyfor theengine operations (highfuel consumption).

Uji Ketahanan 100 Jam Mesin Genset 27 KW Menggunakan Coco-Diesel Fajar, Rizqon; Haryono, Ihwan; Kuddin, Misbah
MESIN Vol 9, No 3 (2007): Ocean Thermal Energy Conversion (OTEC) untuk "Pulau-pulau Kecil"
Publisher : Program Studi Teknik Mesin, Universitas Trisakti

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Durability Test of Small Diesel Engine 27KW Using Coco-Diesel Today, government isconcern on using vegetable oil as alternative fuel which is environment friendly. Biofuel should betransformed to ester compound before used on diesel engines. It is caused that ester has similar physicalproperties comparing to the mineral oil (solar). This paper presents a durability test results on a dieselengine which used ester compoundfrom coconut diesel (coco methyl ester. The test was done for 100hours. The engine test used was a single cylinder Mitsubishi â¢with capacity 27 HP. The engine wascoupled by generator electricity. During durability test the generator was loaded by heaters 10 KW. Fuelconsumption, opacity, exhausts gas temperature andoil condition waschecked at 0, 50 and100hours.Keywords: coco-diesel, specificfuel consumption, opacity, viscosity

EFEK KOMPOSISI BIODIESEL TERHADAP PARAMETER KUALITAS BAHAN BAKAR DAN UNJUK KERJA MESIN (PERBANDINGAN BIODIESEL SAWIT DENGAN BIODIESEL JARAK CASTOR) Fajar, Rizqon; Suryantoro, Taufik; Sugiarto, Bambang; Setiawan, Frans
MESIN Vol 8, No 1 (2006)
Publisher : Program Studi Teknik Mesin, Universitas Trisakti

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Biodiesel is the mono alkyl esters oflong chain fatty acids derivedfrom renewable lipid sources.Biodiesel as asubstitute ofpetroleum dieselfuel has some advantages: itproduces cleaner exhaust gas, betterin lubrication, and doesnt need engine modification. This paper presents the results ofresearch concerningthe effect ofdifferentfatty acid composition ofbiodiesel onfuel quality and its performance in diesel engine.For this purpose three different fuel sample were tested, Indonesian diesel fuel (solar) as a reference,blending solar 70%- oil palm methyl ester 30%(B-3 sawit) and blending ofsolar 70%- castor methylester 30 %(B-30 castor) . All ofthese fuels are tested using Hydra diesel engine, single cylinder indirectinjection (IDI). The test results shows that the performance (peak pressure in the cylinder) ofthreefuels arequite similar, however the two biodiesel blends show lower emission in smoke, hydrocarbon, and CO atdifferent injection timings and different loads. For NOx emission, it is slightly higher. B-30 castor containsmore unsaturatedfatty acids than B-30 sawit and therefore produced higher emission bfNOx. Beside, castormethyl ester contains an extra hydroxyl group in ricinoleic acid that probably leads to lower smoke andhydrocarbon compared to B-30 sawit. It is still aquestion that CO emission ofB-30 castor higher than ofB-30sawit. Research in the effect of chemistry andfatty acid composistionof biodiesel on the emission areneeded to be able describe mechanism ofCO, hydrocarbon andNOxformationfrom biodiesel.

Kajian Fuel Economy Untuk Kendaraan Jenis Sedan dan MPV Dengan Menggunakan Bahan Bakar Gas Dan Berbagai Jenis Bensin Yang Tersedia Di Indonesia Rochmanto, Budi; Setiapraja, Hari; Fajar, Rizqon
Majalah Ilmiah Pengkajian Industri Vol 12, No 2 (2018): Majalah Ilmiah Pengkajian Industri
Publisher : BPPT

Menipisnya persediaan minyak bumi sebagai salah satu sumber energi telah membuat pemerintah Indonesia melakukan efisiensi energi dimana salah satunya adalah menjadikan bahan bakar gas sebagai bahan bakar alternative. Penelitian bahan bakar gas untuk kendaraan telah dilakukan diberbagai negara termasuk Indonesia. Pada paper ini telah dilakukan kajian teknis mengenai pengaruh pemakaian berbagai bahan bakar gasoline yang tersedia dipasar Indonesia dan bahan bakar gas CNG pada kendaraan sedan dan MPV. Kajian ini bertujuan untuk mengetahui pengaruh penggunaan bahan bakar minyak khususnya bensin dan gas CNG pada emisi gas buang, konsumsi bahan bakar, dan biaya operasional kendaraan dengan menggunakan bahan bakar bensin dan CNG. Pengujian dilakukan dengan menggunakan 2 jenis kendaraan yaitu sedan dan MPV yang memiliki kapasitas silinder 1500 cc memakai 4 bahan bakar jenis bensin dengan nilai oktan yang berbeda-beda dan 1 bahan bakar gas (CNG). Metode uji emisi gas buang menggunakan standar Euro 2 sedangkan pengujian konsumsi bahan bakar menggunakan standar UN ECE R101. Hasil pengujian menunjukkan bahwa emisi gas buang untuk CO dan CO2 bahan bakar gas lebih rendah dari pada untuk bahan bakar bensin, tapi hal ini sebaliknya untuk emisi NOx dan THC. Tetapi untuk konsumsi bahan bakar gas yang disetarakan dengan LSP (liter setara premium) hasilnya lebih boros dibandingkan dengan bahan bakar bensin untuk satuan liter per km. Tetapi untuk biaya pemakaian bahan bakar per km, penggunaan bahan bakar gas CNG mempunyai nilai ekonomis yang lebih baik dibanding bahan bakar bensin dikarenakan harga bahan bakar gas CNG yang masih lebih rendah dibanding jenis bensin.

PEMODELAN SIKLUS IN-CYLINDER MESIN DIESEL Nugroho, Bagus Anang; Fajar, Rizqon; Haryono, Ihwan
Majalah Ilmiah Pengkajian Industri Vol 12, No 3 (2018): MAJALAH ILMIAH PENGKAJIAN INDUSTRI
Publisher : BPPT

An engine performance can be predicted through modeling and simulation programs. This paper describes the cycle modeling and breathing process of a four-stroke diesel engine. Calibration of the model parameters to eliminate prediction error. This calibration requires the definition of empirical correlation of two parameters namely mechanical delay and the injector nozzle discharge coefficient. Modeling validation is also given by presenting the result data and evaluating the output parameters of the engine. The result of the diesel engine in-cylinder model produces good predictions by applying a mechanical delay correlation for correction of injection time and correlation coefficient of discharge nozze injector. The parameters for correction of injection duration where the mean temperature and pressure conditions for the duration of the injection are used as input model ignition delay cylinder.Keywords: Modeling, Diesel Engine, Performance, Ignition Delay, Emissions

The Influence of Injection Timing on Performance Characteristics of Diesel Engine Using Jatropha Biodiesel with and without Partial Hydrogenation Fajar, Rizqon; Setiapraja, Hari
Journal of Mechatronics, Electrical Power and Vehicular Technology Vol 5, No 1 (2014)
Publisher : Research Centre for Electrical Power and Mechatronics, Indonesian Istitutes of Sciences

Experimental research has been conducted to investigate the effects of blend of hydrogenated and unhydrogenated Jatropha biodiesel with diesel fuel in volume ratio of 30:70 (B30) on combustion characteristics (BSFC, thermal efficiency and smoke emission) of single cylinder diesel engine. In this experiment, engine speed was kept constant at 1,500, 2,500, and 3,500 rpm with maximum engine load at BMEP 5 bar and injection timings were varied. Experimental result showed that at engine speed 1,500 rpm, BSFC of B30 hydrogenated and unhydrogenated Jatropha biodiesel were higher than it of diesel fuel at all injection timings (10Â° to 18Â° BTDC). At the same condition, partial hydrogenated Jatropha biodiesel showed higher BSFC than unhydrogenated Jatropha biodiesel. However, the difference in BSFC became smaller for all fuels at engine speed 2,500 rpm and 3,500 rpm at all injection timing. Jatropha biodiesel with and without partial hydrogenation tend to have higher thermal efficiency compared with diesel fuel at all engine speed and injection timing. The best injection timings to operate B30 Jatropha biodiesel with and without hydrogenation were 14Â°, 18Â° and 24Â° BTDC at engine speed 1,500, 2,500, and 3,500 rpm respectively. This conclusion was deduced based on the minimum value of BSFC and the maximum value of thermal efficiency. Smoke emissions for all fuels were in the same level for all conditions.

KAJIAN FUEL ECONOMY UNTUK KENDARAAN JENIS SEDAN DAN MPV DENGAN MENGGUNAKAN BAHAN BAKAR GAS DAN BERBAGAI JENIS BENSIN YANG TERSEDIA DI INDONESIA Rochmanto, Budi; Setiapraja, Hari; Fajar, Rizqon
Majalah Ilmiah Pengkajian Industri Vol 12, No 2 (2018): Majalah Ilmiah Pengkajian Industri
Publisher : BPPT

Menipisnya persediaan minyak bumi sebagai salah satu sumber energi telah membuat pemerintah Indonesia melakukan efisiensi energi dimana salah satunya adalah menjadikan bahan bakar gas sebagai bahan bakar alternative. Penelitian bahan bakar gas untuk kendaraan telah dilakukan diberbagai negara termasuk Indonesia. Pada paper ini telah dilakukan kajian teknis mengenai pengaruh pemakaian berbagai bahan bakar gasoline yang tersedia dipasar Indonesia dan bahan bakar gas CNG pada kendaraan sedan dan MPV. Kajian ini bertujuan untuk mengetahui pengaruh penggunaan bahan bakar minyak khususnya bensin dan gas CNG pada emisi gas buang, konsumsi bahan bakar, dan biaya operasional kendaraan dengan menggunakan bahan bakar bensin dan CNG. Pengujian dilakukan dengan menggunakan 2 jenis kendaraan yaitu sedan dan MPV yang memiliki kapasitas silinder 1500 cc memakai 4 bahan bakar jenis bensin dengan nilai oktan yang berbeda-beda dan 1 bahan bakar gas (CNG). Metode uji emisi gas buang menggunakan standar Euro 2 sedangkan pengujian konsumsi bahan bakar menggunakan standar UN ECE R101. Hasil pengujian menunjukkan bahwa emisi gas buang untuk CO dan CO2 bahan bakar gas lebih rendah dari pada untuk bahan bakar bensin, tapi hal ini sebaliknya untuk emisi NOx dan THC. Tetapi untuk konsumsi bahan bakar gas yang disetarakan dengan LSP (liter setara premium) hasilnya lebih boros dibandingkan dengan bahan bakar bensin untuk satuan liter per km. Tetapi untuk biaya pemakaian bahan bakar per km, penggunaan bahan bakar gas CNG mempunyai nilai ekonomis yang lebih baik dibanding bahan bakar bensin dikarenakan harga bahan bakar gas CNG yang masih lebih rendah dibanding jenis bensin.

PEMODELAN SIKLUS IN-CYLINDER MESIN DIESEL Nugroho, Bagus Anang; Fajar, Rizqon; Haryono, Ihwan
Majalah Ilmiah Pengkajian Industri Vol. 12 No. 3 (2018): Majalah Ilmiah Pengkajian Industri
Publisher : Deputi TIRBR-BPPT

An engine performance can be predicted through modeling and simulation programs. This paper describes the cycle modeling and breathing process of a four-stroke diesel engine. Calibration of the model parameters to eliminate prediction error. This calibration requires the definition of empirical correlation of two parameters namely mechanical delay and the injector nozzle discharge coefficient. Modeling validation is also given by presenting the result data and evaluating the output parameters of the engine. The result of the diesel engine in-cylinder model produces good predictions by applying a mechanical delay correlation for correction of injection time and correlation coefficient of discharge nozze injector. The parameters for correction of injection duration where the mean temperature and pressure conditions for the duration of the injection are used as input model ignition delay cylinder.Keywords: Modeling, Diesel Engine, Performance, Ignition Delay, EmissionsÃ‚Â

Deep learning-based prediction of float model performance in floatplanes: A case study on lift-to-drag coefficient ratio Fahmi, Faisal; Fajar, Rizqon; Atmaja, Sigit Tri; Erwandi, Erwandi; Rahuna, Daif
IAES International Journal of Artificial Intelligence (IJ-AI) Vol 13, No 2: June 2024
Publisher : Institute of Advanced Engineering and Science

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.11591/ijai.v13.i2.pp1969-1979

Developing an engineering design is resource-intensive and time-consuming, particularly for the floats of a floatplane design, due to its complexity and limited testing facilities. Intelligent-based computational design (IBCD) techniques, which integrate computational design techniques and machine learning (ML) algorithms, offer a solution to reduce required testing by providing predictions. This paper proposes a deep learning (DL)-based IBCD method for modeling floats' lift-to-drag coefficient ratio (CL/CD), where DL is one of the most powerful ML. The proposed method consists of two phases: hyper-parameter optimization and DL model training and evaluation. A genetic algorithm (GA) is employed in the first phase to explore complex hyper-parameter combinations efficiently. Evaluation of the predicted CL/CD of the floats using the DL model resulted in a satisfactory R-squared of 0.9329 and the lowest mean squared error (MSE) of 0,001536. These results demonstrate the ability of DL model to predict the float's performance accurately and can facilitate further design optimization. Thus, the proposed method can offer a time-efficient and cost-effective solution for predicting float performance, aiding in optimizing floatplane designs and enhancing their functionalities.

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