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Articles 182 Documents
Pengaruh variasi campuran bahan bakar tongkol jagung dan tempurung kelapa terhadap unjuk kerja tungku biomassa Joniarta, I.W.; Wijana, M.; Triadi, A.A. Alit; Iswara, I.B.K.T.H.; Adhi, I.G.A.K.C.
Dinamika Teknik Mesin: Jurnal Keilmuan dan Terapan Teknik Mesin Vol 8, No 2 (2018): Dinamika Teknik Mesin, 10 articles
Publisher : Universitas Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/dtm.v8i2.152

Abstract

Agricultural waste such as corn cobs and coconut shell can be used as alternative energy. Biomass as an alternative energy can be used as a fuel in the furnace. Corncob has low calorific value and density, so it is necessary to examine the combination’s effect of corn cobs and coconut shell toward the performances of biomass furnace.The gasification furnace was the development of a furnace design on previous research. Diameter of combustion chamber is 25 cm, diameter of free air duct and secondary air duct is 2 cm, and primary air duct is 1 cm. Combined corncob and coconut shell in sequence are 100%: 0%, 80%: 20%, 60%: 40%, 40%: 60%, 20%: 80%, 0%: 100%. Investigated parameters showing the furnace performance were boiling time, FCR, power input, power output, power loss and efficiency are boiling time, FCR, operating time, power input, power output, power loss and efficiency. Test of operating time were conducted by burning fuel until burned out. Then boiling time test were conducted by heated 1 liters water from ambient temperature to boiling (between 95oC - 97oC) on a 24 cm diameter pan.The results showed that the largest operating time (1317.33 Seconds), smallest FCR (2.249 Kg/hour), smallest power loss (19.532 kW), and the highest efficiency (8.19%) obtained at 0% : 100% combination. The fastest boiling time (157 Seconds) and the largest power output (1.828 kW) was obtained at 40%: 60% combination. While the largest power input (29.286 kW) was obtained at 60%: 40%.
PENGARUH MODEL REFLEKTOR TERHADAP PERFORMA KOLEKTOR TABUNG DENGAN PHASE CHANGE MATERIAL Tsani, Muhammad Farobi; Sutjahjono, H.; Darsin, M.
Dinamika Teknik Mesin Vol 10, No 1 (2020): Dinamika Teknik Mesin, 10 Articles
Publisher : Universitas Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/dtm.v10i1.312

Abstract

Energi merupakan kebutuhan primer bagi manusia yang hingga saat ini masih bersumber dari bahan bakar fosil. Pemanfaatan energi matahari sebagai energi alternatif mampu dimanfaatkan salahsatunya sebagai pemanas air. Hal ini menunjukkan bahwa perlu inovasi dalam peningkatan performa kolektor pemanas air dengan cara memodelkan reflektor dengan maksud suhu dan efisiensi yang dihasilkan kolektor pemanas air bisa meningkat. Tujuan penelitian ini untuk mengetahui pengaruh model reflektor terhadap performa kolektor tabung. Model reflektor yang digunakan pada penelitian ini yaitu bentuk U-ganda dan U-tunggal. Pengujian dilakukan dengan proses pemanasan pada kolektor selama 4 jam. Hasil penelitian menunjukkan bahwa kenaikan suhu air pada kolektor dengan reflektor U-ganda lebih cepat dibandingkan dengan kolektor dengan reflektor U-tunggal. Efisiensi tertinggi yang dihasilkan yaitu 33,1% pada kolektor dengan U-ganda, sedangkan pada U-tunggal efisiensi tertingginya yaitu 25,3%. Hal ini menunjukkan bahwa model reflektor U-ganda mampu meningkatkan performa kolektor lebih baik dibandingkan dengan reflektor U-tunggal dikarenakan intensitas radiasi yang dipantulkan reflektor U-ganda  lebih besar dibandingkan U-tunggal.
ANALISIS UNJUK KERJA MOTOR BENSIN 4 LANGKAH 1 SILINDER 100 CC BERBAHAN BAKAR ETANOL Mara, I Made; Sayoga, I Made Adi; Nuarsa, I Made; Alit, Ida Bagus; Wiratama, Kade
Dinamika Teknik Mesin Vol 10, No 1 (2020): Dinamika Teknik Mesin, 10 Articles
Publisher : Universitas Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/dtm.v10i1.300

Abstract

In line the population growth, technological developments and the increasing of vehicles, the necessary of fuel is increase. Therefore, the people try to find an alternative fuel that is ethanol as vehicle fuel. To increase the performance and efficiency to use of ethanol fuel in an engine is by varying the ignition timing.This research aimed to investigate the influence of ignition timing to torque, power and specific fuel consumption effective (SFCe) with 96% ethanol fuel. in an engine four stroke single cylinder 100 cc Honda Astrea Legenda. The  ignition timing variation are 15?, 20? and 25? before TDC and the engine speed are 1500, 2500, 3500, 4500, and 6000 rpm.The results show that the engine has better performance when the engine  running on the  ignition timing is advanced. The highest torque at 20? ignition time before TDC 0.868 kgf.m at 6000 rpm, the highest effective power at 20? ignition time before TDC of 7.272 ps at 6000 rpm, and the lowest SFCe at 20? ignition time before TDC is 0, 08 kg / PS.hour at 6000 rpm.
STUDI PENGARUH KADAR MANGAN DAN TEMPERATUR AUSTENISASI TERHADAP STRUKTUR MIKRO DAN SIFAT MEKANIK BAJA MANGAN Bahfie, Fathan; Aleiya, Zakhrofa; Milandia, Anistasia; Nurjaman, Fajar
Dinamika Teknik Mesin Vol 10, No 1 (2020): Dinamika Teknik Mesin, 10 Articles
Publisher : Universitas Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/dtm.v10i1.317

Abstract

High manganese steel or austenitic manganese steelcommonly are used in mining industries such as thecomponent in an excavator, hammer mill, crusher, andjaw crusher plates. Those components are the alloy caststeel with containing manganese (Mn) about 11-18%.The mechanical properties of austenitic manganesesteel are depending on the amount of manganese andcarbon. The austenitic steel has three dominantproperties, i.e. high hardness; good wear resistance, andhigh impact resistance. The objectives of this researchare investigating the effect of the composition ofmanganese and the austenitization temperature on themicrostructure and mechanical properties of austeniticmanganese steel. Each variation of manganesecomposition was 5.87%. 9.42% and 15.28%. It washeated at 950, 1000 and 1050oC for 60 minutes and thenquenched with water. The result showed that the highesthardness was 46 HRC where the composition ofmanganese and the austenitization temperature was5.87%. and 1050oC. The lowest hardness number was16.3 HRC where the content of manganese and thetemperature was 9.42%. and 1050oC. The results agreedwith the microstructure of the increase in carbides andthe composition of manganese increased too. For thewear resistance properties, the optimum one was 6.78 x10-6 mm3/m at the composition of manganese andtemperature of 5.87% and 1050oC.
KINERJA MODUL SURYA MELALUI VARIASI SOLAR COLLECTOR DAN KECEPATAN ANGIN Tira, Hendry Sakke; Natsir, Abdul; Putranto, Tommy
Dinamika Teknik Mesin Vol 10, No 1 (2020): Dinamika Teknik Mesin, 10 Articles
Publisher : Universitas Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/dtm.v10i1.302

Abstract

Solar energy has been developed in wide areas because its potential to replace the current classic energy, fossil fuel. The advantages of solar energy are cheap and clean. To generate solar energy, photovoltaic is used. There are some factors affects the performance of photovoltaic. Some of them are the amount of light beam received and temperature of photovoltaic surface. This research was done to get better understanding of the factors on the photovoltaic performance. In order to reach the goal, two different solar reflector areas and wind velocity were applied. The wind source is coming from a blower while solar reflector was made from glass. The results showed that the watt peak, power point power maximum (PMPP), and output efficiency were increased by application of larger solar reflector and high wind velocity. Larger reflector application resulted in sun light can be focused directly to the solar panel therefore increasing the watt peak. Meanwhile, higher wind speed on the solar panel surface can reduce the solar panel surface temperature which lead to the improvement in maximum output efficiency.
EFFECT OF MOTORCYCLE EXHAUST PIPE TEMPERATURE AND ELECTRICAL CIRCUIT ON HARVESTED DC POWER FROM THERMOELECTRIC GENERATORS Mirmanto, M.; Tira, H.S.; Pabriansyah, A.
Dinamika Teknik Mesin Vol 10, No 1 (2020): Dinamika Teknik Mesin, 10 Articles
Publisher : Universitas Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/dtm.v10i1.319

Abstract

The need for energy consumption nowadays becomes very important things, especially the need for electrical energy. Technology to convert heat into electricity directly can be realized using thermoelectric generators. To know the thermoelectric generator performance, this study performs an investigation of thermoelectric generator operated using motorcycle exhaust heat to generate DC power. Three identical thermoelectric generators model TE-MOD-5W5V-35S were used in this investigation. To generate different high temperatures the motorcycle was run at 1600 rpm, 2100 rpm, 3100 rpm. The circuits examined were series, parallel and combination of the two. All data were recorded using DAQ MX 9714 NI data logger that was connected to the PC using LabView program. The loads used in the current measurements were a thermoelectric cooler module model SP1848 and a fan 12 V - 0.13 A. Those two loads were installed in a parallel circuit. The results show that the tests without load produce the highest voltage, while the tests with the load result in the highest power. Increasing the temperature difference increases the power, and the parallel circuit results in the biggest power but the lowest voltage. The highest voltage of 3.3 V with series circuit was attained, and the highest power of 0.133 W with a parallel circuit was also obtained.
PENGARUH RASIO DIAMETER TERHADAP PARAMETER-PARAMETER ENERGI TURBIN ARUS LAUT HORIZONTAL Rumaherang, Wulfilla Maxmilian
Dinamika Teknik Mesin Vol 10, No 1 (2020): Dinamika Teknik Mesin, 10 Articles
Publisher : Universitas Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/dtm.v10i1.306

Abstract

The ducted tidal turbine models have been developed to utilize convertion of the kinetic energy on ocean currents. The research on refining the turbine characteristics has been carried out by modifying the turbine?s shape and size. The study of the duct diameter ratio effect on the energy characteristics of the turbine was done in this work. This study was conducted by modifying the duct diameter ratio () with the constant inlet diameter D0 and outlet D2. The flow conditions are analyzed for five cases of turbines with different shapes and diameters to determine the optimum conditions. The optimum value of the diameter ratio could be obtained at the maximum value of power coefficient CP. Flow velocity in the ducted turbine was measured at three turbine sections, namely; the inlet section, the impeller housing section, and the outlet section. The measurement of flow in turbines was carried out at the free stream velocity U0 = 1,5 m/s. The power coefficient CP and thrust coefficient CT were calculated based on flow velocity data on the turbine cVennell sections for each case. The power coefficient CP reaches the maximum value (Betz limit) at the resistance coefficient K = 2 and the value of axial induction factor a = 0,37. These values were founded at diameter ratio d=0,66.  The value of thrust coefficient CT reaches the maximum value at K = 3,9, a = 0,53 and . The optimum value of the diameter ratio was founded at d=0,69.
INVESTIGASI SIMULASI NUMERIS DAN EKSPERIMEN PROSES SPRINGBACK BERBENTUK CUP SILIDER PADA LEMBARAN BAJA KARBON JIS-G3141 Mulyanto, Bambang; Khaerudini, D.S.
Dinamika Teknik Mesin Vol 10, No 1 (2020): Dinamika Teknik Mesin, 10 Articles
Publisher : Universitas Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/dtm.v10i1.326

Abstract

Abstrak-Proses pembentukan lembaran baja karbon (sheet metal forming, SMF) adalah salah satu proses manufaktur yang umum digunakan dalam industri otomotif. Dibandingkan dengan pengecoran dan forging, pembentukan dengan lembaran metal lebih memberikan keuntungan, dari berat material yang lebih ringan dan variasi bentuk yang dapat dibuat. Salah satu kendala dalam proses SMF  yaitu fenomana spring back yang dapat menyebabkan penyimpangan ukuran produk lembaran.Springback terjadi karena adanya gaya balik karena pengaruh elastisitas material lembaran baja karbon yang mengalami proses pembentukan. Ironing lembaran baja karbon JIS-G3141 dengan ketebalan 0,8 dan 1,0 mm dilakukan dengan tekanan 2,9 MPa dan penahan waktu 40 stroke per menit (1 stroke per menit ? 1,5 detik). Data eksperimen yang dilakukan dengan die tunggal pada material uji berbentuk Cup Silinder menunjukkan bahwa semakin kecil nilai ironing maka semakin besar nilai springback material. Oleh karena itu, fenomena springback dapat direduksi dengan perekayasaan proses ironing dengan rentang 0,15 mm.
PENGARUH RASIO KONSENTRASI PADA TURBIN AIR SAVONIUS Alit, Ida Bagus; Allo Padang, Yesung; Mas'ud, Mas'ud; Sutanto, Rudy; Susana, I Gede Bawa
Dinamika Teknik Mesin Vol 10, No 1 (2020): Dinamika Teknik Mesin, 10 Articles
Publisher : Universitas Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/dtm.v10i1.307

Abstract

Irrigation channels have the potential to be used as power plants. Savonius water turbine can be developed because it has a simple construction and is suitable for low speed, according to the characteristics of the irrigation channel. The objectives of the research were to understand the influence of the installation of concentrator the performance of Savonius water turbine. Concentrator can steer the incoming water flow toward the turbine blades that generate positive moments, consequently, the generated power increases. Variations in the concentration ratios studied were 2: 1, 3: 1, and 4: 1. The results show that adding concentrators can increase torque, turbine power and power coefficient. The best performance of the Savonius water turbine showed is with the concentrator ratio of 3:1.
REDAMAN SUARA PADA KOMPOSIT SANDWICH POLYESTER BERPENGUAT SERAT SISAL DENGAN CORE STYROFOAM sinarep, S.; Catur, Agus Dwi; Hafidzul, M.
Dinamika Teknik Mesin: Jurnal Keilmuan dan Terapan Teknik Mesin Vol 4, No 1 (2014): Dinamika Teknik Mesin
Publisher : Universitas Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

Penggunaan serat alam pada kulit komposit sandwich dalam  sekat bangunan perlu diteliti kemampuannya untuk menyerap energi suara pada beberapa frekuensi suara target.            Bahan penelitian ini adalah serat sisal anyam, resin polyester, styrofoam. Komposit dibuat dengan metode hand lay-up. Komposit  sandwich polyester tersusun dari dua skin dengan core ditengahnya. Fraksi volume serat komposit sandwich polyester sebagai skin adalah 30 %.  Core yang digunakan ada 2 macam variasi ketebalan yaitu 30 mm dan 40 mm. Spesimen dan prosedur pengujian koefisien redaman suara mengacu pada standar ASTM E1050.Hasil rata-rata redaman suara yang besar terdapat pada spesimen komposit sandwich dengan ketebalan core 30 mm dengan hasil yang fluktuatif pada kenaikan tingkat frekuensi pegujian.  Pada frekuensi rendah 250 Hz dengan nilai redaman 0,809 yang dilapisi kain beludru, frekuensi sedang 750 Hz dengan nilai redaman 0,819 yang dilapisi karpet, dan pada frekuensi tinggi 1500 Hz dengan nilai 0,725 yang dilapisi kain beludru.

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