A.A.I.A. Sri Komaladewi
Grup Riset Industri Manufaktur dan Permesinan, Jurusan Teknik Mesin, Fakultas Teknik, Universitas Udayana

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Pemurnian Biogas Dari Gas Pengotor Hidrogen Sulfida (H2S) Dengan Memanfaatkan Limbah Geram Besi Proses Pembubutan Trisna Negara, Komang Metty; Tirta Nindhia, Tjokorda Gde; Sucipta, I Made; Atmika, I Ketut Adi; Putra Negara, Dewa Ngakan Ketut; Surata, I Wayan; Komaladewi, A.A.I.A. Sri
Jurnal Energi Dan Manufaktur Vol 5, No 1 (2012): Volume 5, Nomor 1, Oktober 2012
Publisher : Jurnal Energi Dan Manufaktur

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This research is intended to utilize waste steel chips from the process of turning (process in which lathemachine is used) for purification of biogas from the gas of hydrogen sulfide (H2S) contaminant to supportthe promotion of zero waste industrial and manufacturing process in the world. The waste of Iron chips iscollected and selected. Only long and spiral like of iron chips that are useful for this purpose. Since thechips having residual stress due to strain hardening during turning process, then the annealing processshould be done before compacting to form a billet.The thickness of the billet was 1 cm and 6 cm indiameter with weight 500 gram. The annealing proces was carried out by burning the iron chip until reachthe red color of fire. During the annealing process the iron inside the steel will react with oxygen to formiron oxide (Fe2O3) and if during oxidation there is a water vapor in the air then the iron bog ore Fe(OH)3 willbe formed. Both of Fe2O3 and Fe(OH)3 are very reactive to H2S and therefore able to eliminate the H2Scontaminant inside the Biogas. The billet is used as a filter and to be installed in the line of biogasdistribution. The result indicate that the the iron chips is potential to be utilized to reduce the H2Scontaminant in the biogas
PELATIHAN TEKNIK ELEKTROPLATING NIKEL BAGI INDUSTRI KERAJINAN KUNINGAN DI DESA KAMASAN KABUPATEN KLUNGKUNG Nindhia, T. G. Tirta; Surata, I W.; Atmika, I K. Adi; Negara, D.N.K. Putra; Komaladewi, A.A.I.A. Sri; Sucipta, I M.
Jurnal Udayana Mengabdi Vol 12, No 2 (2013): Volume 12 No.2 – September 2013
Publisher : Jurnal Udayana Mengabdi

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The Village of Kamasan at Klungkung in the Province of Bali is recognized as a centre of metal handicrafts,especially the handicraft made from brass. Many home industries for the brass handicraft are established in thisvillage. Recently due to Rapid progress of Tourism in Bali, The brass handicraft in Kamasan are growing wellbecause the demand for the souvenir. However some problem arise such as limited of variation, and surface qualityof the brass handicraft that tend to become blurred or dull due to the process of oxidation. This condition makethe brass handicrafts become not so interest as silver handicrafts that can shine for quite long time. To overcomethis problem it is needed to coating the surface of the brass handicrafts so that there will be no contact withoxygen. The coating will be more benefit if able to exhibit more interesting appearance, as what nickel coatingcan affect the appearance of the surface to become like silver but more clear. Equipment for nickel elektroplatingwas designed for this purpose and donated for this purpose. The unique of the equipment that was donated weresmall in size therefore only low electric power is needed, only 1 liter electrolyte was used and can be use manytime. The positive result is obtained for this activity where all participants able to operate the elektroplatingprocess with excellent result.
Karakteristik Traksi dan Kinerja Transmisi pada Sistem Gear Transmission dan Gearless Transmission Komaladewi, A.A.I.A. Sri; Atmika, I Ketut Adi
Jurnal Energi Dan Manufaktur Vol 7, No 1 (2014): April 2014
Publisher : Jurnal Energi Dan Manufaktur

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Abstrak : Sistem transmisi adalah salah satu komponen penting pada sistem drive train, yang fungsiutamanya adalah mentramsmisikan atau mentransformasikan torsi yang keluar dari mesin sampaike torsi yang terjadi pada roda penggerak. Ratio transmisi berpengaruh terhadap besarnya torsiyang dapat ditransmisikan, sedangkan jumlah tingkat kecepatannya berpengaruh terhadapkehalusan (smoothness) proses transmisi dan transformasi daya pada sistem transmisi tersebut.Karakteristik traksi dan kinerja transmisi kendaraan yang diuji adalah Toyota Kijang Inova tahun2012, Pemodelan kinerja traksi dilakukan dengan metode simulasi. Karakteristik traksi dari sistemtransmisi kendaraan dianalisa paada beberapa tingkat kecepatan untuk mengatasi berbagaihambatan sepanjang kondisi operasi kendaraan. Perhitungan awal dari ratio gigi antara yangtertinggi dan terendah dapat dicari dengan menggunakan hukum Progresi Geometri. Ratio dariroda gigi akhir (terendah) ditentukan oleh kecepatan maksimum kendaraan yang akan dirancang.Sedangkan traksi maksimum atau tanjakan maksimum menentukan besar ratio roda gigi awal(tertinggi). Kemudian ratio diantara kedua batas tersebut dibuat sedemikian rupa agar traksi yangdihasilkan kendaraan dapat mendekati karakteristik idealnya. Modifikasi ratio gigi transmisi daristandarnya mendapatkan kebutuhan traksi yang lebih kecil untuk kecepatan yang sama, baikpemasangan 4 tingkat, 5 tingkat, maupun 6 tingkat kecepatan. Jarak kurva traksi antara dua ratiogigi menunjukkan besarnya traksi yang tidak terpakai. Dari grafik kinerja transmisi menunjukkansemakin banyak tingkat transmisi, semakin kecil traksi yang terbuang.Karakteristik traksi mendekatikarakteristik idealnya pada gearless transmission system dengan 10 stages.Kata kunci: drive train, rasio transmisi, kinerja traksi, progresi geometri, gearless transmissionAbstract : The transmission system is one of the important components in the drive train system, whose mainfunction is to transmit or to transform out of the engine torque to the torque that occurs at the drivewheels. Transmission ratio affects the amount of torque that can be transmitted, while the numberof speed levels affect the fineness (smoothness) transmission process and the transformation ofpower in the transmission system. Traction characteristics and transmission performance vehiclesare tested on Toyota Kijang Inova 2012. Modeling traction performance is realized with simulationmethods. Traction characteristics of the vehicle transmission system is analyzed at several levels ofspeed to overcome various obstacles along the vehicle operating conditions. Preliminarycalculations of the gear ratio between the highest and lowest can be found using GeometryProgression law. Ratio of last gear (the lowest) is determined by the maximum speed of the vehicleto be designed. While the maximum traction or maximum incline determine the initial gear ratio (thehighest). Then the ratio between the two limits is made such that the resulting traction vehicle canapproach the ideal characteristics. Modification of the transmission gear ratio from the standardcondition yield traction needs which is smaller in the same speed, whether the installation of 4levels, 5 levels, more even at 6 levels of speed.The distance of traction curve between 2 of gearratio indicates the amount of unused traction. From the graph of transmission performance indicatethat the more the level of transmission, the less traction is wasted. Traction characteristicsapproaching the its ideal characteristics at gearless transmission system with 10 levels.Keywords: drive train, transmission ratio, traction performance, geometric progression, gearlesstransmission