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Jurnal Ilmiah Teknik Mesin
Published by Universitas Lampung
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Core Subject : Engineering,
Mechanical Engineering
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Articles 142 Documents
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Cover Jurnal FEMA Vol.2 No.2 Januari Tahun 2014 Halaman Sampul, Cover
Jurnal Ilmiah Teknik Mesin FEMA Vol. 2 No. 1 (2014)
Publisher : FT UNILA

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Ini adalah identitas Cover Jurnal FEMA Vol.2 No.1 Tahun 2014
PENGARUH KADAR KARBON DALAM BAJA PADA PROSES PELAPISAN ALUMINIUM CELUP PANAS Badaruddin, Mohammad; Alfurkhan, .
Jurnal Ilmiah Teknik Mesin FEMA Vol. 2 No. 1 (2014)
Publisher : FT UNILA

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Carbon steel is widely used as a component of engineering work in high temperature conditions. During the application decreases of oxidation resistance drastically. A steel coating is very needed to increase an oxidation resistance. One technique is inexpensive and used to be coating for large components are hot dip coating. This experiment  aimed to determine the effect of carbon content in steel AISI 1020, AISI 1045 and AISI 1090 against hot dip  aluminium coating on hot dip aluminium coating process and to study the influence of immersion time in the tub aluminium  molten steel on the growth of intermetallic layer. Immersion times used were 4, 9, and 16 seconds with a temperature of 700 °C. Volume composition used for each solution is 100 ml flux with three variations, namely Y1 flux ( 1.5 g KF, NaF 1.5 g, 8.5 g Borax , and 2.5 g of acetic acid ), Y2 ( 2.0 KF g, 2.0 g NaF, 9.5 g Borax, and 3.0 acetic acid ) and Y3 ( 2.5 g of KF, 2.5 g NaF, 10 g Borax, 3.5 g acetic acid ). Then do the impact test , SEM , OM and XRD. For the most thick aluminium layer was AISI 1020 steel with immersion time of 4 seconds is 0.118 mm and Fe - Al intermetallic layer ( FeAl3+Fe2Al5 ) is the thickest on AISI 1045 steel with immersion time of 9 seconds. Energy values were greatest impact on AISI 1020 steel is 187.2 J, means less carbon content of the energy generated greater impact.Keywords : Hot Dip Aluminium, CarbonSteel, Impact Energy,Fe-Al (FeAl3+Fe2Al5), Flux Variations.
Pembuatan Sistem Kendali Numerik untuk Pengerak Sistem Inspeksi Visi Sulaksana, Bambang; Burhanuddin, Yanuar; Sadnowo R, Ageng
Jurnal Ilmiah Teknik Mesin FEMA Vol. 2 No. 1 (2014)
Publisher : FT UNILA

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Commonreasons for implementing automated vision inspection system has been discussed by previous researchers. Many advantages when compared to automated vision inspection of human visual inspection. Automated vision inspection system can work tirelessly, and has accuracy and consistent quality control. Vision inspection system can detect defects that are hard to find by the human visual. Without tools and can operate faster than the human visual. This research will use the software as mach3 CNC control system controls the computer, as the driving bipolar stepper motors, and motor driver IC that is used as a controller L297 and L298 stepper motors. Measuring instruments that are used for data retrieval using calipers. Testing is done by measuring the displacement of the desk and then compare the measured values with values that ruled on the computer simulation of translational motion as far as    1 cm, 2 cm, 3 cm, 4 cm, 5 cm, and 6 cm.From the testing that has been done on each axis movement values obtained average error as follows: on the x-axis value obtained the largest average error was 3%. Then the z axis has an average value of the largest error is 8.4%. Value of the compensation amount given step is 2 times the amount of an ideal step.Keywords: Software Mach3 CNC,  Driver L297 &  L298, Stepper Motor - bipolar.
PENGARUH VARIASI JENIS AIR DAN TEMPERATUR AKTIVASI DALAM CAMPURAN FLY ASH BENTUK PELET TERHADAP PRESTASI MESIN DAN EMISI GAS BUANG SEPEDA MOTOR BENSIN 4 LANGKAH Akbar, Bagus Rachmad; Wardono, Herry; Susila, M.Dyan
Jurnal Ilmiah Teknik Mesin FEMA Vol. 2 No. 1 (2014)
Publisher : FT UNILA

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Meningkatnya jumlah kendaraan bermotor yang masih menggunakan bahan bakar fosil sebagai bahan bakar utama, menyebabkan cadangan bahan bakar fosil semakin menipis. Dengan kondisi seperti ini pemerintah telah mengurangi subsidi bahan bakar dan berencana menerapkan pembatasan pemakaian bahan bakar pada kendaraan bermotor. Fly ash batu bara dapat dimanfaatkan untuk menagtasi hal di atas. Pengujian fly ash ini dilakukan dengan beberapa variasi yaitu pengujian konsumsi bahan bakar, akselerasi, dan emisi gas buang. Konsumsi bahan bakar dilakukan dengan road test (pada kecepatan rata-rata 50 km/jam menempuh jarak 5 km) dan stasioner (pada putaran mesin 8500). Pengujian akselerasi dilakukan pada0-120 km/jam, serta pengujian emisi gas buang pada putaran 1500 dan 8500 rpm. Pelet fly ash yang dibentuk menjadi pelet berdiameter 10 mm dan tebal 3 mm dengan beragam variasi air(air mineral, aquadesh, dan air sumur bor), juga variasi temperatur dan waktu aktivasi fisik (2000 C, 1500 C selama 1 jam dan 2000 C, 1500 C  selama 2 jam).Pelet fly ashtersebut dikemas dalam suatu frame dan diletakkan di dalam saringan udara kendaraan uji sepeda motor yamaha vixion 150 cc. Sehingga sebelum udara masuk ke dalam ruang pembakaran, udara terlebih dahulu terhambat dengan pellet fly ash.Dalam penelitian ini, terbukti pelet fly ash mampu menghemat konsumsi bahan bakar hingga 28,8% pada  road test, dan sebesar 25,5% pada pengujian stasioner. Akselerasi meningkat sebesar 7,3%.Disamping itu, filter pelet fly ashbatubara mampu mengurangi kadar CO hingga sebesar 26,7% pada putaran 1500 rpm dan 45,5% pada putaran 8500 rpm, mengurangi kadar HC hingga sebesar 34,8% pada putaran 1500 rpm dan 30,4% pada putaran 8500 rpm. Kata kunci : Prestasi motor bensin 4 langkah, fly ash batubara, adsorben pelet fly ash.
PENGARUH PUTARAN DAN KECEPATAN TOOL TERHADAP SIFAT MEKANIK PADA PENGELASAN FRICTION STIR WELDING ALUMINIUM 5052 Iqbal, Muhammad; Tarkono, .; Ibrahim, Gusri Akhyar
Jurnal Ilmiah Teknik Mesin FEMA Vol. 2 No. 1 (2014)
Publisher : FT UNILA

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Aluminium is a metal that has a good resistance against corrosion, this is because the occurrence of the phenomenon of pasivasi. In addition to its resistance to corrosion, aluminium also has a lighter weight compared to steel, so aluminium is frequently used as one of the materials used in the manufacture of ships, especially on the upper deck of the building, insulation, fuel tanks and  freshwater tank.Welding is the process of connecting between two or more metal parts by using thermal energy.In general aluminum welding using fusion welding processes such as Metal Inert Gas and Metal Inert Gas, but on both of these methods there is possibility formation of defects are porosity, cracks and prone to occurringdeformationduringcooling processof dan the formation ofmetalwelding. The purpose of this study was to determine the effect of tool rotation and welding speed on the mechanical aspect of Aluminium 5052 with the friction stir welding method.The parameters of the   welding process is done on the research this is is the round tool and welding spee is is the round tool and welding speed.Round tool used there are two namely 1800 rpm and 1100 rpm. The speed of welding is also used there are two variations,namely 11.4 mm/min and 19.8 mm/min. As for the mechanical tests conducted there are three, namely testing the hardness, impact test, and tensile testing.The result of this research was the discovery that the round tool and welding speed greatly affect the mechanical properties of aluminium that has been welded. Because the tool is rotating faster increases the tensile strength of aluminium, while the small welding speed will increase the hardness of aluminum that has been welded. Keywords : aluminium, welding, friction stir welding, mechanical aspect of metals
PENGARUH VARIASI JENIS AIR DAN KONDISI AKTIVASI DARI ADSORBEN ARANG SEKAM TERHADAP PRESTASI MESIN DAN KANDUNGAN EMISI GAS BUANG SEPEDA MOTOR KARBURATOR 4-LANGKAH Pratama, Dian Eka; Wardono, Herry
Jurnal Ilmiah Teknik Mesin FEMA Vol. 2 No. 1 (2014)
Publisher : FT UNILA

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The fuel crisis is one of the problems that faced by the world and Indonesia today. To reduce the vehicle fuel consumption, it can be done by using charcoal from rice husk pellet. This research is done with some testing that is the runs test (road test and acceleration),stationary and emission testing. Charcoal pellets are packed in a frame and placed in the air filter on the absolute revo 110 cc motorcycle.In this study, the efficient use of water in the mixture of pellet making charcoal is the best zeolite water immersion results (H12Z20),the best activation conditions at a temperature of 150 C and the activation time of 2 hours. The charcoal pellets can save fuel by 15.72% on road test, and making the accelerate for 7.02% and save fuel consumption until 18.55% on a stationary test. Rice husk pellets are also proven to reduce vehicle exhaust emissions. it can reduce levels of CO and HC by 85,71% at 37,45%  as well as increasing levels of CO  by 6,70%.Keywords : performance, rice hulk charcoal pellets, charcoal adsorbent pellets, exhaust emissions.
PENGARUH KOMPOSISI DEPOSIT NaCl/Na 2 SO TERHADAP KOROSI TEMPERATUR TINGGI BAJA AISI 4130 YANG DILAPISI ALUMINIUM 4 Saputra, Yudhistyra; Badaruddin, Mohammad; Zulhanif, .
Jurnal Ilmiah Teknik Mesin FEMA Vol. 2 No. 1 (2014)
Publisher : FT UNILA

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Steel AISI 4130 is a combination steelof 1,0 Cr-0,25 Mo-Fe that mostly used for the component heat axchanger and pipe steam   boiler. However in a high temperature and contain of corrosive gas like klor and sulfur,the endurance of the corrosion of steel AISI 4130 declines. It is important to do a research for increasing the endurance of the corrosion of the steel AISI 4130 with heated Al layered in the surface of steel AISI 4130 Al layered and oxidized in temperature 750°C during periods 1-49 jam. The calibration of the corrosion is done with the variation of deposit NaCl/Na The finding of the research shows that the existence of deposit NaCl/Na2 SO in the steel Al layered brings a large influence oxidation kinetics steel, it is proven through the largest value of parabolic constants of the steel AISI 4130 with Al layered with the comparison of deposit  NaCl/Na4(gr):30/70 is 6,89 × 10-9 g2 cm–4 s–1. Whereas the value of parabolic constants with the comparison of deposit (gr): 100/0 is 2,71 × 10 -9 g2 cm–4 s–1, 50/50 is 6,15 × 10 -9  g2 cm–4 s–12 SO24SO4 , 70/30 is 2,97 × 10 g2 cm –4 s–1 and 0/100 is around 2,60 × 10 -9  g 2 cm –4s–1. The destruction of the protective layer Al in the aluminide layer is caused by the existence of klor dan sulfur from the deposit NaCl/Na2SO4 thattriggersthe growthofiron-rich ovide (FeO).Keywords : steel AISI 4130, Al hot-dip, deposit NaCl, deposit Na2SO4 , Al2O3, iron oxide.
PENGARUH VARIASI JENIS AIR DAN KONDISI AKTIVASI DARI ADSORBEN FLY ASH BATU BARA TERHADAP PRESTASI MESIN DAN KANDUNGAN EMISI GAS BUANG SEPEDA MOTOR KARBURATOR 4-LANGKAH Efendri, Denfi; Wardono, Herry
Jurnal Ilmiah Teknik Mesin FEMA Vol. 2 No. 1 (2014)
Publisher : FT UNILA

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The activated fly ash of coal as adsorbent pellets can be used to save fuel consumption. This research is done with some testing that is the runs test (road test and acceleration), stationary and emission testing. Fly Ash pellets packed in a frame and put on the air filter absolute revo 110 cc motorcycle. So before the air filter into the vehicle, it wil be contact with the pellets Fly Ash first. In this study, the most efficient types of water used is H12 Z20  and the best conditions was on the temperature 150o C and activation time of 1 hour with fuel savings in road test reached 12.69%, and fuel economy at a stationary test up to 22.65% and the reduction of travel time ( 0-80 km/h ) of 6.86%. Fly Ash pellets are able to reduce the levels of CO by 76,92 %, 19,57 % for HC levels and raise their levels of CO  by 4,36 %.Keywords : Fly ash adsorbent pellets, engine performance, exhaust gas emissions
PERANCANGAN DAN PEMBUATAN STRUKTUR MEKANIK SISTEM INSPEKSI VISI Purnomo, Adi; Burhanuddin, Yanuar; Harun, Suryadiwansa
Jurnal Ilmiah Teknik Mesin FEMA Vol. 2 No. 1 (2014)
Publisher : FT UNILA

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The benefit of automatic vision inspection compared with human visual inspection is also able to work all the time, more consistent and accurate. The vision inspection is also able in detecting any the defective which are difficult to find by human vision. The objectives of this research are to design and to make the mechanical structure of vision inspection system. The structure should able to carry the camera to the X and Z axis. The straightness of made structure is measured to insure the movement of each axis is also straight. The measurement done by measuring the straightness of Z axis railtrack, straightness of X axis railtrack and the parallelness was of X axis railtrack. The material of the structure was  ASTM A 500 hollow steel structure. The result of the stress was 3302666.5 N/m2  which smaller than the allowable stress of material  268895534.6 N/m. The deflection was  0.05443mm which is  smaller than the allowable deflection of material. The highest deviaton straightness of Z axis railtrack was at the point 75cm from the start point. The highest deviation straightness of X axis railtrack  is 1.4mm at the point 30cm from the first point, the highest deviation on the straighness of the parallelnes of X axis railtrack is 57cm from the first point. Several causes of the fault is detected  from the point that have expansion of the chink of every rail, it caused during the assembly (welding) process, so that material is deformed cause of the thermal that arised in the welding process and the installation of the rail that is not straight cause the railtrack is not aligned. Keywords : vision inspection, mechanical structure, straightness, parallelnes, deviation.
STUDI KOMPARASI DARI ZAT ADITIF SINTETIK DENGAN ZAT ADITIF ALAMI TERHADAP PEMAKAIAN BAHAN BAKAR DAN EMISI GAS BUANG PADA MESIN GENSET MOTOR BENSIN 4-LANGKAH Maindra, .; Harmen, .; Susila, M.Dyan
Jurnal Ilmiah Teknik Mesin FEMA Vol. 2 No. 1 (2014)
Publisher : FT UNILA

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Kebutuhan listrik yang terus meningkat dan belum diiringi dengan peningkatan pasokan listrik dari PLN (Perusahaan Listrik Negara) sehingga sering terjadi pemadaman listrik. Masyarakat yang menggunakan listrik dari PLN mencari alternatif lain dengan menggunakan genset sebagai sumber pembangkit listrik sementara. Pada umumnya penggunaan genset digunakan untuk memenuhi kebutuhan listrik rumah tangga, kantor dan toko-toko. Mesin genset umumnya menggunakan bahan bakar bensin. Dengan kenaikan harga bahan bakar minyak saat ini, biaya operasional genset menjadi meningkat. Untuk mengatasi hal ini sekarang sudah tersedia jenis zat aditif sintetik dan zat aditif alami. Dengan penambahan zat aditif  pada bahan bakar (bensin) dapat meningkatkan angka oktan dan kualitas dari bahan bakar sehingga didapatkan pembakaran yang sempurna. Untuk itu penelitian ini bertujuan untuk mengetahui pengaruh dari pemakaian zat aditif sintetik dengan zat aditif alami  terhadap pemakaian bahan bakar dan emisi gas buang pada genset. Untuk itu dilakukanlah serangkaian pengujian, pada pengujian ini menggunakan mesin genset CAMARO 4-langkah berbahan bakar bensin. Variasi pada pengujian  ini meliputi pengujian konsumsi bahan bakar tanpa zat aditif, dengan zat aditif sintetik dan  dengan zat aditif alami untuk tanpa beban dan dengan beban 700 watt. Variasi waktu yang digunakan dalam penelitian yaitu selama 10 menit, 20 menit dan 30 menit. Zat aditif yang digunakan dalam penelitian ini yaitu jenis zat aditif sintetik dengan perbandingan 1 (satu) pil/tablet untuk 4 liter bensin premium (1:4) dan untuk jenis zat aditif alami dengan perbandingan 1 (satu) pil/tablet untuk 30 liter bensin premium (1:30). Pada pengujian emisi gas buang bertujuan untuk mengetahui kandungan kadar gas CO, HC dan CO  yang dihasilkan mesin genset.Dari penelitian ini, didapat penurunan konsumsi bahan bakar terbaik yaitu pada kondisi tanpa beban dengan zat aditif sintetik sebesar 15,66 % dan pada beban 700 watt sebesar 16,99 %. Tegangan listrik yang dihasilkan mesin genset sebesar 181,106 volt dan nyala lampu yang dihasilkan tidak seterang dengan nyala lampu dari PLN yang tegangan listriknya sebesar 220 volt. Untuk penurunan kadar gas CO terbaik yaitu dengan menggunakan zat aditif alami pada kondisi tanpa beban sebesar 5,35 % dan pada beban 700 watt sebesar 9,06 %, untuk penurunan kadar gas HC terbaik yaitu dengan menggunakan zat aditif sintetik pada kondisi tanpa beban sebesar 344 ppm dan pada beban 700 watt sebesar 585 ppm, untuk peningkatan kadar gas CO  terbaik yaitu dengan menggunakan zat aditif alami pada kondisi dengan beban 700 watt sebesar 6,3 %. Untuk prestasi terbaik pada penggunaan zat aditif sintetik pada kondisi tanpa beban sebesar 15,66 % dan pada beban 700 watt sebesar 16,99 %. Untuk perbandingan biaya bahan bakar lebih murah menggunakan zat aditif sintetik untuk 1 (satu) liter bahan bakar pada kondisi tanpa beban biaya yang dihabiskan sebesar Rp. 6.645,- dan mesin genset dapat beroperasi  selama 2,9 jam, untuk 1 (satu) liter bahan bakar pada kondisi dengan beban 700 watt biaya yang dihabiskan sebesar Rp. 6.645,- dan mesin genset dapat beroperasi selama 1,3 jam. Kata Kunci : Mesin genset, zat aditif sintetik, zat aditif alami, konsumsi bahan bakar, emisi gas buang, biaya bahan bakar.

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