Arijanto Arijanto
Dosen Jurusan Teknik Mesin, Fakultas Teknik, Universitas Diponegoro

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PENGARUH TEMPERATUR TUANG PADA PROSES PENGECORAN STIR CASTING TERHADAP DENSITAS DAN POROSITAS KOMPOSIT ALUMUNIUM DIPERKUAT SERBUK BESI Sulardjaka, Sulardjaka; Wibowo, D B; Arijanto, Arijanto; Setiaji, E F
ROTASI VOLUME 13, NOMOR 3, JULI 2011
Publisher : Departemen Teknik Mesin, Fakultas Teknik, Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (210.606 KB) | DOI: 10.14710/rotasi.13.3.19-21

Abstract

Penelitian ini meneliti pengaruh temperatur tuang pada pembuatan komposit alumunium yang diperkuat serbuk besi, terhadap densitas dan porositas bahan komposit yang diperkuat dengan serbuk alumunium. Proses pembuatan komposit dilakukan dengan metode stir cast. Proses pengadukan dilakukan pada temperatur 750 oC, dengan putaran pengadukan 400 rpm selama 10 menit. Pengujian densitas bahan komposit dilakukan dengan metode Archimedes. Hasil penelitian menunjukkan temperatut tuang 725 oC memberikan distribusi serbuk besi yang terbaik.
PENINGKATAN NILAI KALOR BIOBRIKET CAMPURAN SEKAM PADI DAN DOMINANSI KULIT KACANG METE DENGAN METODE PIROLISA Eridhani, Onky; Arijanto, Arijanto; Muchammad, Muchammad
JURNAL TEKNIK MESIN VOLUME 1, NOMOR 4, OKTOBER 2013
Publisher : JURNAL TEKNIK MESIN

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Abstract

The requirement of fuel in Indonesia has increased recently. It needs an alternative fuel in order to increase the production of energy resources. One of the alternative energy sources is biomass. The materials to create biomass in Indonesia are rice husk, cocoa shell, and cashew shell. From these materials, biomass then is formed into biobriquette to increase mass density. The objective of this research is knowing the influence of pyrolysis process against the increasing of biobriquette heat value and knowing the comparison of the best heat value result of biobriquette composition 75% cashew shell – 25% rice husk from Torrefaction and the different pyrolysis method. Biobriquette which is used is made from the mixture of rice husk and cashew shell. Pyrolysis is a chemical putrefaction process from organic substance with high heating temperature within 300 ⁰C – 500 ⁰C. The research was held by using biobriquette composition 50% cashew shell – 50% rice husk, 75% cashew shell – 25% rice husk, and 100% cashew shell with mass percentage. Those materials of biobriquette are blended, and then bonded with PVA glue, and after that it was formed into briquette with 25 – 30 mm height and diameter is 25 mm. And then, the briquettes are pyrolized by temperature of 350, 400, and 450 ⁰C with a varied holding time within 15, 30, and 45 minutes. The result of this research is all of those variations can increase the heat value of biobriquette. The highest heat value result of biobriquette from these 3 compositions occured at the composition of biobriquette 100% cashew shell which was tested at the temperature of 450 ⁰C with the holding time at 30 minutes is 7233,1 call/g. However, The biobriquette’s mass had also decreased by the amount of 63,38% from the former weight 9,9 gram. From torrefaction and pyrolysis method with different variation which had ever been done before, biobriquette with the composition of 75% cashew shell – 25% rice husk at this pyrolysis test produced the highest heat value, that is 6407,6 call/g.
PENINGKATAN NILAI KALOR BIOBRIKET CAMPURAN KULIT METE DAN DOMINANSI SEKAM PADI DENGAN METODE PIROLISA Putra, Resha Widya Permana; Arijanto, Arijanto; Muchammad, Muchammad
JURNAL TEKNIK MESIN VOLUME 1, NOMOR 4, OKTOBER 2013
Publisher : JURNAL TEKNIK MESIN

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (15.13 KB)

Abstract

Biomass is an alternative fuel that can replace the role of coal, but it has not been widely usedbecause of low calorific value and less valuable form . Thus briquetting and pyrolysis are answersto the problem. Pyrolysis is a thermochemical decomposition of organic material at elevatedtemperatures between 300 0C - 500 0C, without participation of oxygen. Biomass materials, widelyavailable in Indonesia, are rice husks, cocoa shells, and cashew shells. The purposes of this studywere to determine the effect of pyrolysis process, to increase the calorific value and to compare theresults of biobriquette calorific composition value of 75% cashew shell - 25% rice husk bytorefaction testing and pyrolysis testing with pyrolysis of biobriquette 75% rice husk - 25% cashewshell . The biomass was then formed into biobriquette to increase the density of the mass.Biobriquette materials used in this study were rice husk and cashew shell. Mass compositionbetween cashew shell and rice husk was 50% - 50%, 75% -25%, and 100% glued together usingPVA glue. Then they were formed into briquettes with 25-30 mm high and 25 mm in diameter withdirect sunlight drying for 24 hours. Next, variations of pyrolysis temperature 325 0C, 350 0C and 3750C were carried out within ranges of time of 15 minutes, 30 minutes, and 45 minutes. The highestincreased calorific value was at 375 0C within time duration of 45 minutes was 5401.9 cal / g. Inaddition, the percentage of weight loss occured at 100% biobriquette composition of rice huskweight which decreased by 57.99%. Compared to torefaction and pyrolysis testings with differentvariations before, both testings produced the best calorific value of 6368.54 cal / g by testingbiobriquette 75% cashew shell - 25% rice husk at pyrolysis temperature of 300 0C.
PENINGKATAN NILAI KALOR BIOBRIKET CAMPURAN SEKAM PADI DAN DOMINANSI KULIT KACANG METE DENGAN METODE PIROLISA Eridhani, Onky; Arijanto, Arijanto; Muchammad, Muchammad
JURNAL TEKNIK MESIN Vol 1, No 4 (2013): VOLUME 1, NOMOR 4, OKTOBER 2013
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (854.815 KB)

Abstract

The requirement of fuel in Indonesia has increased recently. It needs an alternative fuel in order to increase the production of energy resources. One of the alternative energy sources is biomass. The materials to create biomass in Indonesia are rice husk, cocoa shell, and cashew shell. From these materials, biomass then is formed into biobriquette to increase mass density. The objective of this research is knowing the influence of pyrolysis process against the increasing of biobriquette heat value and knowing the comparison of the best heat value result of biobriquette composition 75% cashew shell – 25% rice husk from Torrefaction and the different pyrolysis method. Biobriquette which is used is made from the mixture of rice husk and cashew shell. Pyrolysis is a chemical putrefaction process from organic substance with high heating temperature within 300 ⁰C – 500 ⁰C. The research was held by using biobriquette composition 50% cashew shell – 50% rice husk, 75% cashew shell – 25% rice husk, and 100% cashew shell with mass percentage. Those materials of biobriquette are blended, and then bonded with PVA glue, and after that it was formed into briquette with 25 – 30 mm height and diameter is 25 mm. And then, the briquettes are pyrolized by temperature of 350, 400, and 450 ⁰C with a varied holding time within 15, 30, and 45 minutes. The result of this research is all of those variations can increase the heat value of biobriquette. The highest heat value result of biobriquette from these 3 compositions occured at the composition of biobriquette 100% cashew shell which was tested at the temperature of 450 ⁰C with the holding time at 30 minutes is 7233,1 call/g. However, The biobriquette’s mass had also decreased by the amount of 63,38% from the former weight 9,9 gram. From torrefaction and pyrolysis method with different variation which had ever been done before, biobriquette with the composition of 75% cashew shell – 25% rice husk at this pyrolysis test produced the highest heat value, that is 6407,6 call/g.
PENINGKATAN NILAI KALOR BIOBRIKET CAMPURAN KULIT METE DAN DOMINANSI SEKAM PADI DENGAN METODE PIROLISA Putra, Resha Widya Permana; Arijanto, Arijanto; Muchammad, Muchammad
JURNAL TEKNIK MESIN Vol 1, No 4 (2013): VOLUME 1, NOMOR 4, OKTOBER 2013
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (614.591 KB)

Abstract

Biomass is an alternative fuel that can replace the role of coal, but it has not been widely used because of  low calorific value and less valuable form . Thus  briquetting and pyrolysis are answers to the problem. Pyrolysis is a thermochemical decomposition of organic material at elevated temperatures between 300 0C - 500 0C, without participation of oxygen. Biomass materials, widely available in Indonesia, are rice husks, cocoa shells, and cashew shells. The purposes of this study were to determine the effect  of  pyrolysis process, to increase the calorific value and to compare the results of biobriquette calorific composition value of 75% cashew shell - 25%  rice husk by torefaction testing and pyrolysis testing with pyrolysis of biobriquette 75% rice husk - 25% cashew shell . The biomass was then formed into biobriquette to increase the density of the mass. Biobriquette materials used in this study were rice husk and cashew shell. Mass composition between cashew shell and rice husk was 50% - 50%, 75% -25%, and 100%  glued together using PVA glue. Then they were formed into briquettes with 25-30 mm high and 25 mm in diameter with direct sunlight drying for 24 hours. Next, variations of pyrolysis temperature 325 0C, 350 0C and 375 0C were carried out within ranges of time of 15 minutes, 30 minutes, and 45 minutes. The highest increased calorific value was  at 375 0C within time duration of 45 minutes was 5401.9 cal / g. In addition, the percentage of weight loss occured at 100% biobriquette composition of rice husk weight which decreased by 57.99%. Compared to torefaction and pyrolysis testings with different variations before, both testings produced the best calorific value of 6368.54 cal / g by testing biobriquette 75% cashew shell - 25% rice husk at pyrolysis temperature of 300 0C.
ANALISIS PENGARUH KEKENTALAN FLUIDA AIR DAN MINYAK KELAPA PADA PERFORMANSI POMPA SENTRIFUGAL Arijanto, Arijanto; Yohana, Eflita; Sinaga, Franklin T.H.
JURNAL TEKNIK MESIN Vol 3, No 2 (2015): VOLUME 3, NOMOR 2, APRIL 2015
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Diponegoro

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Abstract

The current industrial world requires equipment, that working effectively and efficiently to reduce operational costs. One tool that is often encountered is the pump. This is because the pumping system is responsible for nearly 20% of the worlds electrical energy demand and energy use in industrial plants. One of the most frequent problems encountered in the process of pumping is the viscosity of the fluid. This research aimed to analyze the effect of viscosity of the flow capacity, pump head, power and efficiency of the pump for pump fluid flow of water and coconut oil. Water density 996 kg/m3, oil density of 858 kg/m3, water viscosity of 0.82 mPas, the viscosity of the coconut oil 3,98 mPas. Variations that give the full aperture or100%, opening 75%, 50% and aperture openings 25%. research data calculated from the pressure, rpm, flow, and flow velocity. From the data we receive a pump head, the pump shaft and the efficiency of the performance curve obtained with the method of dimensionless. The research results show the water fluid maximum flow rate is 36 l/min, while the fluid coconut oil is 17 l/min. Value of water fluid head is 15.18 m, while the oil fluid obtained 9.18 m. The value of BHP water fluid 130.04 W, where as the oil fluid is 131.98 W. And for the value of water fluid efficiency 68.46%, while the oil fluid is 16,59%. The conclusion is the value of higher water discharge fluid from the fluid coconut oil, water fluid water head value is higher than the fluid coconut oil, water fluid efficiency values higher than coconut oil, while the value of fluid power pumps oil is higher than the fluid water.
PENGUJIAN BAHAN BAKAR GAS PADA MESIN SEPEDA MOTOR KARBURATOR DITINJAU DARI ASPEK TORSI DAN DAYA Saputra, Topan Frans; Arijanto, Arijanto
JURNAL TEKNIK MESIN Vol 3, No 2 (2015): VOLUME 3, NOMOR 2, APRIL 2015
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Diponegoro

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Abstract

Fossil fuels are a very important source of energy in everyday life, especially in the field of transport and are non-renewable energy sources, while existing data obtained when these vehicles circulating in Indonesia reached 80 million units, of which 85 per cent of this amount is a motorcycle with a majority using the engine carburetor. This experiment aimed to test alternative fuels fuel oil fuel is fuel gas. After testing it was found that the best torque produced fuel LPG gas is 8.20 Nm 7.82 Nm and blue gas at 4000 rpm rotation. The best power generated fuel gas is 2.10 kW and blue gas was 2.06 at 5000 rpm rotation. For the rate of fuel consumption pertamax more fuel efficient than the gas at any rpm the test. As for the fuel efficiency of LPG gas reached 43.94%, pertamax 61.26% at 5000 rpm rotation, and 43.12% blue gas at 4000 rpm rotation
PENGGUNAAN BAHAN BAKAR GAS PADA MESIN SEPEDA MOTOR DITINJAU DARI ASPEK DAYA dan TORSI Sudrajat, Mochammad Waris; Arijanto, Arijanto
JURNAL TEKNIK MESIN Vol 2, No 4 (2014): VOLUME 2, NOMOR 4, OKTOBER 2014
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Diponegoro

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Abstract

Pemakaian  bahan  bakar  minyak berpengaruh  negatif  terhadap  dua  hal  pokok.  Pertama, pengaruh  terhadap ketersediaan  bahan  bakar.  Kedua,  pengaruh  terhadap  peningkatan  emisi gas buang yang berimbas pada pemanasan global. Pengujian akan mengkaji efek perubahan bahan bakar dari premium  ke gas (LPG) terhadap performa mesin  sepeda motor Honda SUPRA X- 125 cc helm in karburator meliputi daya, torsi, konsumsi bahan bakar dan efisiensi. Metode pengujiannya menggunakan metode Constant Speed Test. Berdasarkan hasil penelitian dapat disimpulkan:(1)Torsi pengereman yang dihasilkan bahan bahan bakar LPG  mengalami penurunan 9,9% untuk rata rata tiap putaran dari  bahan bakar premium.(2) Daya pengereman yang dihasilkan bahan bahan bakar LPG mengalami penurunan 9,7% untuk rata rata tiap putaran dari bahan bakar premium.(3) Konsumsi bahan bakar LPG lebih tinggi dari bahan bakar premium, namun karena harga bahan bakar LPG lebih murah dari bahan bakar premium  terjadi penghematan biaya sebesar 25,4 % untuk rata rata tiap putaran  dari bahan bakar premium.(4) Untuk sfc(spesifik fuel consumtion) terbaik bahan bakar LPG terjadi pada putaran 4000 sampai 4300 rpm, sedaangkan untuk bahan bakar premium terjadi pada putaran 3000 sampai 4000 rpm.(5) Efisiensi terbaik bahan bakar LPG terjadi pada putaran 3000 sampai 5000 rpm ,sedangakan efisiensi terbaik bahan bakar premium terjadi pada putaran mesin 3000 sampai 3500, ditijau dari prestasi mesin terjadi penurunan performa  mesin bahan bakar LPG dilihat dari aspek torsi dan daya , dengan kata lain pergantian bahan bakar premium ke LPG tidak bisa diterapkan secara langsung karena perbedaan karateristik kedua bahan bakar tersebut dan mesin uji yang dirancang untuk bahan bakar cair
PENGARUH BAHAN BAKAR GAS LPG TERHADAP EMISI GAS BUANG SEPEDA MOTOR KARBURATOR Purnadi, Heri; Arijanto, Arijanto
JURNAL TEKNIK MESIN Vol 2, No 4 (2014): VOLUME 2, NOMOR 4, OKTOBER 2014
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Diponegoro

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Abstract

Laju penjualan kendaraan bermotor di Indonesia semakin tahun semakin meningkat dan di dominasi oleh sepeda motor. Hal ini berdampak pada persediaan minyak bumi yang terus menipis, sehingga mendorong manusia menjadi kreatif. Berbagai cara dilakukan untuk mengefisiensikan kinerja mesin sehingga pemanfaatan minyak bumi menjadi semakin efektif. Selain menemukan teknologi untuk mengefisienkan kinerja mesin, penelitian juga dilakukan untuk mencari bahan bakar alternatif selain bahan bakar minyak.Gas LPG (Liquified Petroleum Gasses) adalah salah satu bahan bakar yang layak digunakan sebagai bahan bakar alternatif. LPG adalah campuran dari berbagai unsur hidrokarbon yang berasal dari gas alam. Komponen utama LPG terdiri dari Hidrokarbon ringan berupa Propana (C3H8) dan Butana (C4H10), serta sejumlah kecil Etana (C2H6) dan Pentana (C5H12). Keuntungan penggunaan LPG yaitu emisi gas buang yang rendah. Disamping itu, persediaan gas alam di Indonesia masih cukup banyak bila dibandingkan dengan persediaan minyak bumi. Meskipun demikian beberapa hal yang perlu menjadi pertimbangan apabila menggunakan LPG sebagai bahan bakar yaitu LPG tidak dianjurkan pada mesin kendaraan bermotor dalam kondisi masih standar. Pengujian dilakukan pada mesin sepeda motor Supra X Helm In 4 langkah dengan variasi putaran mesin dan variasi bahan bakar menggunakan bahan bakar premium, pertamax plus, gas elpiji dan blue gaz. Selain itu dilakukan pengukuran emisi gas buang dengan menggunakan alat Gas Analyzer Stargas mod 898. Dari hasil pengujian bila dibandingkan dengan premium, pertamax plus mengalami penurunan kadar CO sebesar  24,18 % sampai 28,81 %. Gas elpiji mengalami penurunan kadar CO sebesar  24,37 % sampai 65,50 %. Blue gaz mengalami penurunan kadar CO sebesar  26,16 % sampai 80,92 %. Kesimpulan dari pengujian ini bahwa bahan bakar gas LPG layak digunakan sebagai bahan bakar alternatif dilihat dari emisi gas buang yang dihasilkan.
PENGUJIAN PRESTASI MESIN ISUZU PANTHER MENGGUNAKAN ALAT PENGHEMAT BBM ELEKTROLIZER AIR Arijanto, Arijanto; Utomo, Toni Suryo
ROTASI Volume 12, Nomor 1, Januari 2010
Publisher : Departemen Teknik Mesin, Fakultas Teknik, Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (567.662 KB) | DOI: 10.14710/rotasi.12.1.23-30

Abstract

Semakin lama kebutuhan energi bahan bakar semakin meningkat, akan tetapi tidak cadangan sumberminyak bumi semakin menipis. Untuk itu diperlukan suatu terobosan baru untuk mencari alternativeenergi yang biasa digunakan.Salah satu penggunaan Elektrolizer HHO adalah dengan menggunakan bahan bakar hidrogen (gasBrown). Penggunaan bahan bakar yang termasuk dalam kategori yang belum lazim digunakan olehmasayarakat umum. Hal inilah yang mendorong adanya penelitian-penelitian penggunaan ElektrolizerHHO. Dalam penelitian ini bahan bakar yang digunakan adalah gas HHO (gas Brown). Penelitianyang dilakukan adalah dengan menguji penggunaan gas Brown pada mesin diesel yang biasadigunakan sebagai kendaraan umum. Dari hasil pengujian ternyata alat penghemat ini cukup layakdigunakan, walaupun ada sedikit kandungan metal yang meningkat didalam minyak pelumas. Sehinggaakan diketahui bagaimana performa mesin diesel setelah menggunakan Elektrolizer HHO sertapenghematan yang dapat dicapai.