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Articles 174 Documents
OPTIMASI CAIRAN PEMBANGKIT MESIN PENCUCI FILM RADIOGRAF PADA LABORATORIUM FISIKA MEDIK UNNES Rahayu Ningtias, Diah; Susilo, S.; Sutikno, S.
Dinamika Teknik Mesin: Jurnal Keilmuan dan Terapan Teknik Mesin Vol 3, No 2 (2013): Dinamika Teknik Mesin
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Abstract

Automatic film washing machine (TAEHN, model TM 300E in Physics Laboratory of FMIPA Unnes was successfully optimized by variating temperatures of developer and fixer solution in the range of 28˚C until 40˚C with temperature interval of 2˚C. At the first, developer solution was variated at controlled fixer temperature namely 30˚C, then it was analyzed to fixer determine density of each radiograph film. The optimum temperature of developer solution is available to varying temperature of fixer solution. The optimum temperatures of developer solution and fixer solution are 32˚C and 32˚C, respectively.
Analisa Pengaruh Variasi Sudut Sambungan Belokan Terhadap Head Losses Aliran Pipa Zainudin, Zainudin; Adi Sayoga, I Made; Nuarsa, Made
Dinamika Teknik Mesin: Jurnal Keilmuan dan Terapan Teknik Mesin Vol 2, No 2 (2012): Dinamika Teknik Mesin
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Abstract

On the water distribution, the connection of pipe bends is typically obtained either in industry or in housing. On the water distribution, it is often gained the lost of energy or head losses. The amount of head losses occurring in the connection of branch pipe is influenced by several factors, such as: diameter, flow, viscosity, and the angle at the bend pipe connections.This study aimed to determine the effect of variation of the connection point of the bend pipe to the head losses and pressure drop. To do it, the researcher uses an experimental method as a tool by varying the bend angle is 30o, 45o, 60o, and 90o. The result shows that head losses and the small pressure drop occur in the bend angle 30o is 73, 23 mm and 907.606 N/m2. While the head losses and pressure drop is the greatest at an angle of 90o, is 74, 80 mm and 1278,899 N/m2.
Uji Eksperimental Konsumsi Bahan Bakar Mesin Berbahan Bakar Biodiesel Minyak Kelapa Hasil Metode Kering Padang, Yesung Allo
Dinamika Teknik Mesin: Jurnal Keilmuan dan Terapan Teknik Mesin Vol 1, No 2 (2011): Dinamika Teknik Mesin
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Abstract

Experimental testing using coconut oil produced by dry method on engine has been conducted in the Laboratory of Energy Conversion, Mechanical Engineering, Mataram University. The purpose was to evaluate the effect of using this coconut oil on the engine performance. The oil was mixed with diesel oil in order to obtain biodiesel. There were four combinations of ratio diesel oil to coconut oil; namely 100% : 0% (mkp0%), 90%:10% (mkp10%), 80%:20% (mkp20%) and 70%:30% (mkp30%.). Mitsubishi L300 diesel engine was used in this experiment by variating engine speed 1000 rpm, 1050 rpm and 1100 rpm with torgue load at 1 kg. At engine speed of 1200 rpm the loads were varied as 1 kg, 1.5 kg and 2 kg. The result shows that by increasing the number of coconut oil in the mixture will reduce engine fuel consumption. Fuel consumption of the mixture will be better compare to the fuel consumption of pure diesel oil. Specific fuel consumption efective (SFCe) of coconut oil-diesel mixture at mkp 10%, 20% and 30% are lower than of pure diesel oil. The reduced SFCe are 1.45 %, 1.71% and 3.57 % at effective power 0.838 PS, 1.98%, 4.31% and 4.31% at effective power 1.257 PS and 1.22%, 3.92% and 7.12% at effective power 1.676 PS. By varying the engine speed, the result also shows that SFCe of the mixture is also lower than SFCe of pure diesel oil.
ANALISA KEKUATAN BENDING KOMPOSIT EPOXY DENGAN PENGUATAN SERAT NILON Sari, Nasmi Herlina; Sinarep, S.
Dinamika Teknik Mesin: Jurnal Keilmuan dan Terapan Teknik Mesin Vol 1, No 1 (2011): Dinamika Teknik Mesin
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Abstract

The development of composite materials in the field of engineering is increasingly being used. This is because of its properties are superior compared to conventional materials, as the ratio between strength and density are quite high, stiff, the manufacturing process is very simple and resistant to corrosion and fatigue loads. The purpose of this study was to determine the effect the addition of nylon fibers with Epoxy Matrix on the increase in bending strength of epoxy composites.  The objected of this study was the composite of nylon fiber, which is cut 12 mm nylon fiber with epoxy resin as a fastening material. Before performing an experiment testing the tensile fibers has done and known to the stress of 461.22 MPa. There are 3 variations of volume fraction In this experiment, those are volume fraction of 40%, 50%  and  60%, with 3 variation each.  Method in the manufacture of specimens with the way the mould press. Tools to test the specimen is bending test machine (servopulser). Specimens using a standard test of ASTM C 393-94. Bending test results showed that the nylon fiber composite with fiber volume fraction 40% stress of 787.16 MPa, modulus of elasticity of 1.06 GPa, volume fraction of 50% the stress of 902.01 MPa, modulus of elasticity of 1.08 GPa, and for 60% volume fraction of the stress of 950.02 MPa, modulus of elasticity of 0.99 GPa.
Pengaruh kecepatan udara dan massa gabah terhadap kecepatan pengeringan gabah menggunakan pengering terfluidisasi Syahrul, S.; Mirmanto, M.; Romdani, S.; Sukmawaty, S.
Dinamika Teknik Mesin: Jurnal Keilmuan dan Terapan Teknik Mesin Vol 7, No 1 (2017): Dinamika Teknik Mesin, 8 articles
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Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (520.852 KB) | DOI: 10.29303/dtm.v7i1.8

Abstract

Grain processing does not meet the actual grain harvests. This is due to the unsuitable drying process. Milling grain entrepreneurs and farmers in Indonesia are currently conducting a drying process under the sun. Based on the National Standards Body (BSN), grain moisture content must be at 14% to maintain the grain at high qualities. The purpose of this study is to determine the effect of velocity and grain mass variations on drying times. The grain used in this study contains an initial moisture content of 22% ± 0.5%. The grain is dried by inserting it into the drying chamber and varying the air velocities and grain mass. The air velocities used are 4 m/s, 5 m/s, 6 m/s and the variations of the grain mass are 1 kg 2 kg and 3 kg. The results show that increasing the air velocity decreases the drying time. On the other hand, when the grain mass is increased, the drying time elevates. The air velocity and mass of the grain that results in the fastest drying time are 6 m/s and 2 kg. The time required for achieving the water content of 13.6% is 30 menit. At the air velocity of 4 m/s, and the grain masses of 1 kg, 2 kg, and 3 kg, to achieve moisture contents of 13.4%, 13.5% and 13.4% the drying time needs 50 minutes.
Studi eksperimental terhadap porositas dan hambat alir udara pada komposit penyerap suara Sari, N.H.; Fajrin, J.; Yudhyadi, I.G.N.K.
Dinamika Teknik Mesin: Jurnal Keilmuan dan Terapan Teknik Mesin Vol 8, No 1 (2018): Dinamika Teknik Mesin, 8 articles
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Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (987.506 KB) | DOI: 10.29303/dtm.v8i1.100

Abstract

In this paper, we present a comprehensive analytical and experimental investigation for the determination of the air flow resistivity and porosity of sound absorber composite. The ratio of the volume fraction of fiber and polyester resin is 15, 25, 35, 55 and 65 (%).The dimensions of the absorbent composite sample are 29 mm x 20 cm (diameter x thickness). Porosity and Air flow resistivity of composites have been investigated. The results showed that the porosity of the composites increased with increasing amount of fiber due to the interface between fiber and resinless dense. In contrast, the air flow resistivity values are lower with a denser resin and fiber interface.
ANALISIS PERILAKU ALIRAN TERHADAP KINERJA RODA AIR ARUS BAWAH UNTUK PEMBANGKIT LISTRIK SKALA PIKOHIDRO Jamlay, Kristianus; Sule, Luther; Hasan, Duma
Dinamika Teknik Mesin: Jurnal Keilmuan dan Terapan Teknik Mesin Vol 6, No 1 (2016): Dinamika Teknik Mesin, 10 articles
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Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (417.867 KB) | DOI: 10.29303/dtm.v6i1.25

Abstract

Energy of water is one of the renewable energy that can be converted into electrical energy without pollution. Rotation, torque, and power generated by the water wheel can be used directly both for irrigation pumping and for running a rice mill even move the alternator and electrical generators. The purpose of this study was to find the best water wheel performance indicated by torque, rotation, and power as well as the relative speed of the water at the side of the blade. The results obtained in the preliminary test were the average water velocity of 2.50 m/s, the average rotation shaft of 79.78 rpm, the average torque on the shaft of 58.98 Nm, the average power of 510,67 W. The second results were also obtained as given the results and discussion section. It was found that the best water wheel performance based on the analysis was shown in the second test results.
PENGARUH VARIASI TEMPERATUR PIROLISIS TERHADAP KADAR HASIL DAN NILAI KALOR BRIKET CAMPURAN SEKAM PADI-KOTORAN AYAM Saparudin, S.; Syahrul, S.; Nurchayati, N.
Dinamika Teknik Mesin: Jurnal Keilmuan dan Terapan Teknik Mesin Vol 5, No 1 (2015): Dinamika Teknik Mesin
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Abstract

Energy is vital necessity as can not free on our daily. In a row inhabitant growth and economic development, the will necessity energy fuel oil (BBM) every years direct advance, until reseve fossil energy in the suppose quickly will finished. In the side other, increase the production well of agriculture sector although animal husbandry will the appear dirty area issue, because increase the waste as not used to well, the until necessary solution other enegy alternative.            Biomass of the rise husk and chicken feces the have potential as high enough for in manner fuel become, be choosen that is briquettes, because the secondly this is waste be haved element contens carbon end course fiber as hight enough. Biomass briquettes this experiment in the difference become biocharcoal briquettes by pyrolysis process with the temperature variation 225°C, 275°C, 325°C and 375°C. The testing of experiment this is content result testing and calorofic value in the contents from temperature variation.            The result of this experiment show that, the bigger of the pyrolysis temperature which is used the precentage of charcoal will be lower. The result of testing calorofic value briquetess biocharcoal the biggest that is 4252,67 kal/gr in the show on 275°C temperature the while, for lower calorofic value 3821,33 kal/gr on 225°C temperature. Of the calorofic value and  as result, briquettes biocharcoal of the rice husk mixture with chicken feces the haved potential to growth as alternative fuel, be side energy contens as high enough, the material cheap and can easy. 
PENGARUH JUMLAH JET HOLE DAN DIAMETER INNER PIPE TERHADAP UNJUK KERJA KOMPOR ALKOHOL Humaidi, Irwan; Alit, Ida Bagus; Nuarsa, I Made
Dinamika Teknik Mesin: Jurnal Keilmuan dan Terapan Teknik Mesin Vol 3, No 2 (2013): Dinamika Teknik Mesin
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Abstract

Alcohol is an renewable alternative fuel produced from plants material. Plants usually contains essence such as : cassava, yam, corn, and sago palm essence. Processing for producing alcohol begin from hydrolysis process, that is essence converts to glucose then fermentation process to converting glucose to ethanol and CO2. After fermentation process ends, we continue to destilation process to decomposing alcohol based on its boiling point.This research aims to know design of alcohol stove design by variating its jet hole quantity and inner pipe diameters. Duration of heating, heat dropped, fuel consumption, and alcohol-stove efficiency are attentioned variables in this research. Combustion process of alcohol-stove begin with entering fuel to fuel tube then firing up the stove by striking fire on weep hole in inner pipe, combustion will increasing stove temperature and steam the alcohol. The steam will turn out through the jet hole so the stove flame is stable.This research result shows have been showing the stove most optimum showed by alcohol stove with 1 ½ inch inner pipe diameter variation with most jet hole is 8 holes, because the efficience at variation of this  stove is high and the burning time it quick also.  The greatest quantity of fuel consumption with variety of jet hole 16 amount  with 1 ½  inch diameter that is 0.1061 ml/second. Whereas the bigest stove efficiency contained in stove with inner pipe diameter variety 1 ¼ inch with amount of jet hole 8 that is 48,33%. 
DESAIN TUNGKU BRIKET BIOMASSA SYSTEM KONTINYU SEBAGAI TEKNOLOGI PEMANFAATAN ENERGI ALTERNATIF PENGGANTI BAHAN BAKAR TERPAKAI PADA OVEN TEMBAKAU DI MASYARAKAT PEDESAAN Wijana, Made; Nurchayati, Nurchayati
Dinamika Teknik Mesin: Jurnal Keilmuan dan Terapan Teknik Mesin Vol 3, No 1 (2013): Dinamika Teknik Mesin
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Abstract

Semakin menipisnya cadangan minyak dunia yang menyebabkan harga bahan bakar minyak (BBM) terus melambung. Tungku spiral berbahan bakar minyak tanah, merupakan komponen utama pada oven (omprongan) tembakau yang ada di NTB, yang mana potensi tembakau Virginia sebanyak 45.534 ton dan memerlukan minyak tanah 45 juta liter. Tembakau yang banyak tersebut  terancam tidak dapat dikeringkan akibat mahal dan langkanya minyak tanah sebagai bahan bakar utama. Sementara energy alternative pengganti berupa bongkahan batu bara dan kayu bakar tidak memberikan solusi yang baik.  Untuk  itu dalam penelitian ini didesain tungku yang kemudahan pengoperasiannya menyerupai kombinasi tungku minyak tanah dan tungku bongkahan batu bara dengan memanfaatkan kelebihan dan memperbaiki kelemahan-kelemahannya.  Dengan tungku yang mudah dioperasikan sebagai alat pemanfaat energi alternative dan terbarukan, maka masyarakat akan tertarik untuk menggunakannya, ini akan berdampak pada menurunnya biaya pengovenan tembakau. Metode yang digunakan dalam penelitian ini adalah eksperimen langsung, untuk mengetahui kinerja tungku spiral dilakukan beberapa pengujian. Untuk mendapatkan kesepadanan kemampuan pemanasan antara tungku spiral berbahan bakar minyak tanah dengan tungku desain baru berbahan bakar briket, dilakukan pengujian nilai kalor dan perhitungan jumlah alur briket yang diperlukan, selanjutnya dilakukan pengujian boilling time pada masing-masing tungku.  Dan untuk mengetahui peningkatan waktu operasional tungku baru dibanding bahan bakar alternatif lain, dapat dilakukan pengujian lama nyala dalam satu kali pengisian tungku briket.  Serangkain pengujian ini dilakukan untuk mengetahui apakah  tungku desain baru ini layak  digunakan pada omprongan tembakau.Dari hasil pengujian nilai kalor diperoleh bahwa nilai kalor tertinggi adalah minyak tanah dengan nilai kalor, 9.828,2816 Kkal/kl, dan yang terendah adalah briket biomassa dengan nilai kalor 4.996,5028 Kkal/kg. Pada tungku spiral diperoleh kecedrungan bahwa semakin besar stelan, maka n boilling time semakin kecil (cepat) dan kebutuhan bahan bakar yang semakin besar. Waktu yang dibutuhkan untuk mendidihkan 1 liter air ( boiling time) yang paling kecil (cepat) adalah pada stelan ke 4 yaitu 178,67 detik, pada posisi ini, kebutuhan bahan bakarnya terbesar yaitu  103,33 ml. dari pengujian  tungku briket desain baru yang menggunakan dua bahan bakar alternative,  boilling time kedua bahan bakar alternative (briket) tersebut masih lebih besar dibandingkan dengan tungku spiral stelan ke 4. yaitu  masing-masing 390.67 detik untuk briket biomassa dan 255.33 detik untuk briket batubara. Sedangkan dilihat dari boiling time tungku spiral stelan ke 2 yang memiliki nilai 437.33, maka kedua bahan bakar alternative yang menggunakan tungku desain baru, memiliki boiling time yang lebih kecil (cepat) dan dari pengujian lama operasional tungku berbahan bakar briket biomassa, dibandingkan dengan bongkahan batubara dan kayu bakar, diperoleh peningkatan lama operasional sebanyak tiga kali lipat. Bongkahan batubara dan kayu bakar, dalam satu kali pengisian dapat beroperasi selama maksimal 2 jam, sedangkan tungku desain baru berbahan bakar biomassa, dapat beroperasi 6 jam dalam satu kali pengisian. Sedangkan Mekanisme kerja penekan briket, alur briket dan penahan ruang pembakaran dapat berjalan sesuai fungsinya sehingga, kontinyuitas tungku dalam 1 kali pengisian dapat berjalan dan beroperasi dengan stabil selama 6 jam.  Dari kinerja tersebut, maka tungku desain baru layak menggantikan tungku spiral pada omprongan tembakau .

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