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Mesin
Published by Institut Teknologi Bandung
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Articles 539 Documents
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KELAMBATAN WAKTU PENYALAAN CAMPURAN SOLAR DAN METIL ESTER KELAPA SAWIT PADA MOTOR DIESEL INJEKSI LANGSUNG L, Prawoto; Shalahuddin, Shalahuddin; Nugroho, R. C
Mesin Vol 19, No 1 (2004)
Publisher : Mesin

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Abstract

Ignition delay is an important parameter in diesel engine operation. It is defined as the time (or crank angle degree) between the start of injection and the start of combustion. Ignition delay should be kept as short as possible, otherwise diesel knocking can occur if the delay is too long. Many works have shown that increasing fuel cetane number may shorten the ignition delay. In conjunction with the BPBT – PPKS Biodiesel Project to utilize methyl ester palm oil (sawit) (MES) as an alternative fuel, several compositions of MES-conventional diesel fuel blends were tested. Cetane number of MES-diesel fuel blends were calculated to be higher than that of conventional diesel fuel. Hence, it was expected that the MES-diesel fuel blends would yield shorter ignition delay than pure diesel fuel. Engine tests were conducted to compare the performance of several blends of MES-diesel fuel. The results from in-cylinder pressure data, from which ignition delay was determined have confirmed this work. Furthermore, correlations between ignition delay, cetane number, and engine speed have been obtained in simple linear equations.Key words: Ignition delay, Cetane number, Biodiesel, Methyl Ester Sawit (MES), Direct injection.
PEMODELAN STATISTIK MEKANISME KEAUSAN ABRASI Soemantri, Satryo
Mesin Vol 6, No 1&2 (1987)
Publisher : Mesin

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Abstract

Analisis mekanisme keausan abrasi untuk kondisi keausan abrasi two~body dilakukan denqan memperhatikan distribusi statistik ukuran partikel abrasif. Hasil analisis menunjukkan bahwa pengaruh beban, jarak kontak dan kekerasan material terhadap keausan mendekati hasil analisis yang dilakukan oleh peneliti lain yang didasarkan atas model partikel tunggal. Dalam analisis mekanisme keausan abrasi tersebut, dibahas pula beberapa perkiraan kuantitatif‘ mengenai pengaruh ukuran partikel abrasif terhadap laju keausan.
ANALYSIS OF USING ALTERNATIVE REFRIGERANTS FOR ENERGY SAVING IN DESIGN FRAMEWORK OF AIR-CONDITIONING SYSTEM Astina, I Made; Darmanto, Prihadi Setyo; Warsito, Warsito; Adryanto, Edwin
Mesin Vol 20, No 2 (2005)
Publisher : Mesin

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Abstract

Environmental issues enforce us to find environmental friendly alternative refrigerants. Increasing energy consumption as consequence of widespread usage of air-conditioning systems needs effort to find efficient systems. Use ability of alternative refrigerants and effect of modified vapor-compression cycles were investigated in this research. In figuring effects of their application on a real air-conditioning system, analysis of redesign of air-conditioning system was concerned to make clear the problem. The results confirm that a right selection of refrigerants to air-conditioning system can improve its performance. Energy saving and economical costs can be reduced significantly. Several groups of hydrocarbons (HC) and hydrofluorocarbons (HFC) have good thermodynamic performance and better than R-22 that will be phased out. By introducing these alternative refrigerants, carbon-dioxide (CO2) emissions can be reduced due to energy saving caused by increasing of the coefficient of performance (COP).
PENGUKURAN FAKTOR INTENSITAS TEGANGAN DENGAN MENGGUNAKAN STRAIN GAGE Suharto, Djoko; Nazaruddin, Nanang
Mesin Vol 10, No 1&2 (1994)
Publisher : Mesin

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Abstract

Penentuan faktor intensitas tegangan dapat dilakukan dengan beberapa metoda, antara lain metoda analitik, numerik maupun eksperimental. Dalam penelitian ini dilakukan percobaan penggunaan strain gage tunggal (single strain gage) untuk pengukuran faktor intensitas tegangan, KI, clan kelangguhan inisiasi relak, KIq Dari penelitian ini diperoleh cara untuk menentukan orientasi, lokasi dan ukuran strain gage yang menjadi dasar penelitian lanjutan dalam penentuan faktor intensitas legangan pada fenomcna retak oepat (fast-fracture) dan retak lelah.
PEMODELAN DAN SIMULASI SISTEM PEMBANGKIT TURBIN GAS PLTGU TANJUNG PRIOK Indrawanto, Indrawanto; Cahyono, H
Mesin Vol 24, No 2 (2009)
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Abstract

This paper presents the modeling and simulation of the gas turbine generating system of Tanjung Priok Combined Cycle Power Plant. The gas turbine model is approximated using steam turbine systems. The model developed only accepts load changes as input to the system. Three types of control systems; speed-droop governor, speed-droop governor with integral control, and speed-droop governor with integral and derivative control have been tried to control the frequency of the system. The simulation results show that, in the presence of load changes, the speed-droop governor with integral and derivative control is able to bring back the system frequency to 50 Hz without oscillation.
KARAKTERISTIK AERODINAMIS DUA SILINDER TERIRIS TYPE 1 YANG TERSUSUN SIDE BY SIDE PADA BILANGAN REYNOLDS SUBKRITIS Siregar, Indra Herlamba; Muis, Abdul
Mesin Vol 22, No 1 (2007)
Publisher : Mesin

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Abstract

Experimental studies of aerodynamics characteristics of two cylinders type I in side by side configuration at sub-critical Reynolds number were carried out at open circuit of subsonic wind tunnel. Gap of side by side configuration T/D was varied from 1.1 to 4 and sliced angle both of frontage an behind cylinder at 45°, 53° and 65°. Total drag reduce since gap of cylinders increase for sliced angle 45° and 53° but increase for sliced angle 65°. Bias flow phenomenon showed at close and moderate gap of cylinders tend to symmetries at width gap. Visualization have done with smoke method to get more information about characteristics of two cylinders type I in side by side configuration
PEMOTONGAN DENGAN MENGGUNAKAN ABRASIVE WATERJET Brodjonegoro, Satryo Soemantri; Nugroho, Yudhi P; Sutrimono, Sutrimono
Mesin Vol 11, No 3 (1996)
Publisher : Mesin

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Abstract

Non-conventional cutting is required for quality production which is usually difficult to be achieved by conventional cutting. Besides non-conventional cutting provides advantages in simplified cutting process and its flexibility. This paper describes the theory of non-conventional cutting process using abrasive water-jet, the design and manufacturing of the cutter and also the performance testing.
Pengaruh Variasi Tinggi Terjunan Dan Dimensi Tabung Kompresor Terhadap Unjuk Kerja Pompa Hydram Sutanto, Rudy -; Nurchayati, Nurchayati; Mulyanto, Arif; Wardani, Kusuma
Mesin Vol 26, No 2 (2017)
Publisher : Mesin

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (575.925 KB) | DOI: 10.5614/MESIN.2017.26.2.4

Abstract

Lahan kering merupakan salah satu agroekosistem sumberdaya lahan yang mempunyai potensi besar untuk pengembangan pertanian. Kendala teknis pertanian lahan kering adalah dalam ketersediaan air. Untuk meningkatkan indeks pertanaman di lahan kering, perlu adanya pemanfaatan sumberdaya air permukaan seoptimal mungkin. Untuk mengatasi pemenuhan kebutuhan air irigasi di daerah lahan kering, alternatif yang bisa dikembangkan adalah dengan menggunakan sistem irigasi pompa ramah lingkungan yakni pompa hydram. Tujuan dari penelitian ini adalah untuk mengetahui pengaruh dimensi tabung udara terhadap unjuk kerja pompa hydram. Pompa hydram yang digunakan dalam penelitian ini mempunyai ukuran 1.5 inci dan variasi tinggi terjunan 2, 3, 4 dan 5 m. Pompa hydram yang digunakan dalam penelitian ini mempunyai susunan ILK (input – limbah – tabung udara) dengan memperhitungkan pengaruh variasi dimensi tabung udara dengan volume konstan (5 variasi, diameter x tinggi : 7.5 x 60, 8.75 x 44.1, 10 x 33.75, 11.25 x 26.67 dan 12.5 x 21.6) dan variasi posisi lubang output discharge (5 variasi : 0, 5, 10, 15 dan 20 cm dari dasar tabung udara) terhadap unjuk kerja pompa hydram yang meliputi : debit output, debit limbah, head maksimum dan efisiensi yang dihasilkan pompa hydram. Hasil penelitian menunjukkan bahwa setiap kenaikkan 1 meter tinggi terjunan maka debit ouput akan mengalami kenaikkan rata-rata sebesar 36.6%. Setiap kenaikkan 1 meter tinggi terjunan maka head maksimum akan meningkat sebesar 5 ÷ 6 meter. Variasi dimensi atau ukuran tabung kompresor kurang berpengaruh terhadap debit output maupun head maksimum pompa hydram. Sedangkan efisiensi tertinggi didapat pada tinggi terjunan 2 meter dan variasi pompa ke 2 (dengan ukuran tabung udara 8.75 cm x 44.1 cm) yakni sebesar 33.98%.
KAJI TEORITIK ASPEK TERMOHIDROLIK REAKTOR RISET PADA DAYA 2 MW Nazar, Reinaldy; Suwono, Aryadi; Soelaiman, T.A Fauzi
Mesin Vol 13, No 1 (1998)
Publisher : Mesin

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Abstract

The thermohydraulic aspect utilization on a nuclear reactor is very dominant, because the system gives limitation on the reactor operation. Regarding the problem, theoretical analysis of thermohydraulic aspect is done for a research reactor of 2 MW with hexagonal configuration of fuel elements With an assumption that the power generation each fuel element is the same and the other facilities are neglected, the output of FLUENT V4.25 program gave information that theoretically this research reactor can be operated on thermal power of 2 MW.
The Influence of Sheet Metal Forming on The Axial Crushing Analysis of Top–Hat Columns Santosa, Sigit P; Tam, Le Hoai; Gunawan, Leonardo; Jusuf, Annisa
Mesin Vol 25, No 1 (2016)
Publisher : Mesin

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (889.555 KB) | DOI: 10.5614/MESIN.2016.25.1.4

Abstract

Reducing the rate of casualty in the crash events is always on the top priority of car manufacturers and customers. It is therefore necessary to make accurate predictions of car structural behavior during the crash events. To achieve this goal, the axial crushing behavior of the thin-walled top hat column needs to be understood thoroughly so that the crashworthiness performance of the column can be predicted accurately. The effect of sheet metal forming should be considered since many car crashworthiness components are fabricated by sheet metal forming. This paper presents a numerical study to investigate sheet metal forming effects such as: thickness distribution, residual stress and plastic strain change to the crushing force characteristics of the top-hat columns. First, the design of the top-hat column was generated by using deep drawing forming process simulation. Then, the forming parameters (geometry, residual stress, plastic strain, thickness distribution) were transferred to the non-linear finite element dynamic analysis model. The axial crushing simulations for the top-hat column with forming parameters were then performed and analyzed. The results showed that the sheet metal forming has a considerable effect on the crush behavior and performance of the thin-walled top-hat columns.

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