Jurnal Mechanical
Jurnal Mechanical (eISSN 2460 1888 and pISSN 2087 1880), is a peer-reviewed journal that publishes scientific articles from the disciplines of mechanical engineering, which includes the field of study (peer) material, production and manufacturing, construction and energy conversion. Articles published in the journal Mechanical include results of original scientific research (original), and a scientific review article (review). Mechanical journal published by University of Lampung and managed by Department of Mechanical Engineering, Faculty of Engineering for publishing two periods a year, in March and September .
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234 Documents
<![CDATA[PENGARUH PERBANDINGAN ECENG GONDOK DAN KOTORAN SAPI TERHADAP PROSES FERMENTASI UNTUK MENDAPATKAN ENERGI BIOGAS ]]>
<![CDATA[Kms Ridhuan]]>
<![CDATA[ JURNAL MECHANICAL Vol 3, No 2 (2012) ]]>
Publisher : <![CDATA[Jurusan Teknik Mesin, Fakultas Teknik, Universitas Lampung ]]>
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<![CDATA[levels and low lignin content of potential to be used as raw material for production of biogas. As well biodegradatif Cow manure contains bacteria that can initiate and sustain the production of biogas and water can accelerate the growth of microorganisms and methane-producing organisms are more optimum.This study aims to examine the ratio of water hyacinth, cow dung and water to biogas production better. Water hyacinth and leaves cut approximately 2 to 3 cm, cow dung and water and put into a plastic into Kriya reactor with a capacity of 120 liters and with airtight closed anaerobic process with two different ratio 10:9:48 (kg) and 11:14 : 42 (kg) with a time of 70 days. Parameters measured pressure, volume and temperature of biogas.The results of the study showed that the optimum ratio between the water hyacinth, cow dung and water is 11:14:42 (kg) with the highest volume of 12 492 liters and the highest pressure 109.3 kN/m2, as well as high-pressure hourly te 4100 N/m2. The difference is clearly visible, especially in the pressure measurement, the ratio of 11:14:42 (kg) is even better. The ideal fermentation time in both comparisons are even up to 60 days to 70 days biogas production but there is still very little or small. With time optimum biogas production is starting on day 7 to day 20.Keywords: Biogas, water hyacinth, cow manure]]>
<![CDATA[Analisis Limit Momen Pipa Elbow dengan Beban In-Plane Bending ]]>
<![CDATA[Asnawi Lubis]]>
<![CDATA[ JURNAL MECHANICAL Vol 1, No 1 (2010) ]]>
Publisher : <![CDATA[Jurusan Teknik Mesin, Fakultas Teknik, Universitas Lampung ]]>
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<![CDATA[Pipe bends or elbows are of important component in a piping system. In addition to its function for changing the direction of piping due to layout restriction, an elbow can accommodate expansion because it is more flexible than an equivalent straight pipe with the same material and dimension. However, and elbow can not be analyzed using the engineer theory of bending, because its cross-section become oval under bending. This paper reports a result of finite element study of bending behavior of a pipe elbow and its influence on limit moment. Limit moment was obtained using nonlinear analysis and Newton-Raphson algorithm was employed. Material behavior of pipe was treated as large strain, elastic-perfectly-plastic. The results show that a pipe elbow under in-plane opening bending is stiffer than those under in-plane closing bending, indicated by their limit load – 4.83 times yield stress for in-plane opening bending and 1.34 times the yield stress for in-plane closing bending. Keywords: pipe elbow, limit moment, nonlinear analysis, in-plane bending]]>
<![CDATA[Experimental Study on Vortex Tube as Cooling of Machine Panel ]]>
<![CDATA[Herman Budi Harja]]>
<![CDATA[ JURNAL MECHANICAL Vol 5, No 2 (2014) ]]>
Publisher : <![CDATA[Jurusan Teknik Mesin, Fakultas Teknik, Universitas Lampung ]]>
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<![CDATA[Generally, The air conditioning in the panel of CNC machine always uses electric fan to avoid overheating in electrical components. The availability of compressed air on CNC machines infrastructure allows the utilization of inovation through the use of vortex tube as a cold air generator. Vortex tube is a mechanical device that can separate the flow of pressurized air into hot and cold air. The cold air can be used as a substitute for cooler fan. The experimental study was conducted to examine the corelation between the value ratio value with generated cold temperatures, as well as its application as cooling panel. Vortex tube testing was conducted at Polman Bandung, it was tested on machine panel of CNC lathe machine (CKE61130) with a volume panel of 0.26m.3 The result of study showed that the vortex tube with a ratio value of 0.44 generates the lowest cold temperature. Furthermore the experiment test showed that vortex tube can function properly and maintain the air temperature between 25 ° C to 35 ° C.]]>
<![CDATA[Analisis Fraksi Volume Serat Pelepah Batang Pisang Bermatriks Unsaturated Resin Polyester (UPR) Terhadap Kekuatan Tarik dan SEM ]]>
<![CDATA[Tumpal Ojahan]]>;
<![CDATA[R. Hansen]]>;
<![CDATA[Aditia M.S.]]>
<![CDATA[ JURNAL MECHANICAL Vol 6, No 1 (2015) ]]>
Publisher : <![CDATA[Jurusan Teknik Mesin, Fakultas Teknik, Universitas Lampung ]]>
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DOI: 10.23960/mech.v6.i1.201506
<![CDATA[Serat alam telah terbukti sebagai material yang kuat, mampu untuk menggantikan serat sintetik sebagai penguat. Serat batang pisang kepok salah satu serat yang memiliki potensi sebagai penguat untuk polyester material komposit. Pada material komposit berpenguat(fiber) serat batang pisang kepok dapat menahan beban yang diterima material komposit. Sedangkan unsaturated resin polyester (UPR) sebagai pengikat serat batang pisang, bekerja menahan beban dan melindungi serat dari kerusakan. Hasil pengujian kekuatan tarik yang paling optimal terdapat pada volume fraksi 28% fiber : 72% matriks dengan gaya maksimum 2327,9 N, tegangan tarik 67,2065 N/mm2, regangan 2,7477% serta modulus elastisitas 3441,82 N/mm2. Pada pengamatan SEM fraksi volume 28% filler : 72% matriks paling optimal karena adanya ikatan matriks dan serat menyatu dengan sempurna. Dari penelitian ini dapat disimpulkan bahwa pengaruh fraksi volume serat batang pisang kepok sebagai penguat (fiber) dan unsaturated resin polyester (UPR) sebagai pengikat (matriks) pada material komposit akan mempengaruhi kekuatan material kompositlebih kuat dan ulet.Kata kunci : serat pisang kepok, komposit, fraksi volume, kekuatan tarik, SEM]]>
<![CDATA[Proses Pack Carburizing dengan Media Carburizer Alternatif Serbuk Arang Tongkol Jagung dan Serbuk Cangkang Kerang Mutiara ]]>
<![CDATA[Sujita Sujita]]>
<![CDATA[ JURNAL MECHANICAL Vol 7, No 2 (2016) ]]>
Publisher : <![CDATA[Jurusan Teknik Mesin, Fakultas Teknik, Universitas Lampung ]]>
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DOI: 10.23960/mech.v7.i2.201606
<![CDATA[Tujuan dari penelitian ini adalah untuk mengetahui pengaruh penggunaan arang tongkol jagung dan serbuk cangkang kerang mutiara sebagai media carburizer pada proses pack carburizing terhadap sifa (struktur mikro) dan mekanis (uji kekerasan) baja karbon rendah. Bahan yang digunakan dalam penelitian ini adalah baja karbon rendah yang berbentuk selinder. Proses pembuatan spesimen dilakukan dengan pemotongan menjadi beberapa bagian, pemotongan dilakukan untuk memudahkan di dalam meletakan spesimen di dalam kotak karburisasi,kemudian serbuk arang kayu dan serbuk cangkang ditimbang sesuai dengan komposisi yang diinginkan dengan pencampuran serbuk cangkang kerang mutiara 5, 10 , 20 dan 25 (% berat). Spesimen dilakukan perlakuan panas pada temperature 9100C, 9300C, 9500C dengan penahanan waktu selama 90, dan 150 menit. Kemudian dilakukan Uji kekerasan Vickers, pengujian foto struktur mikro dan uji komposisi. Dari penelitian ini dapat disimpulkan bahwa nilai kekerasan tertinggi rata-rata pada penambahan 20% serbuk cangkang di peroleh sebesar 262,47 kg/mm2 dan kekerasan material awal diperoleh sebesar 144,08 kg/mm2. Dari hasil pengamatan struktur mikro dan uji komposisi diketahui bahwa terjadi pengerasan permukaan karena difusi karbon kedalam baja karbon randah.]]>
<![CDATA[Desain dan Analisis Kekuatan Rangka Tricycle Landing Gear UAV Menggunakan Metode Elemen Hingga ]]>
<![CDATA[Lasinta Ari Nendra Wibawa]]>
<![CDATA[ JURNAL MECHANICAL Vol 9, No 2 (2018) ]]>
Publisher : <![CDATA[Jurusan Teknik Mesin, Fakultas Teknik, Universitas Lampung ]]>
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DOI: 10.23960/mech.v9.i2.201806
<![CDATA[Penelitian ini mengkaji tentang desain dan analisis kekuatan rangka tricycle landing gear menggunakan metode elemen hingga. Analisis statik linear dilakukan menggunakan software Autodesk Inventor Professional 2017. Material rangka landing gear menggunakan Aluminium 6061. Variabel kecepatan landing vertikal yaitu 4 m/s, 6 m/s, 8 m/s, dan 10 m/s. Hasil simulasi menunjukkan bahwa rangka tricycle landing gear cukup aman untuk menahan kecepatan landing hingga 8 m/s karena memiliki faktor keamanan sebesar 2,32.]]>
<![CDATA[Karaktristik Pola Aliran Pemisahan Kerosene-Water Pada Pipa T-Junction Sudut 90˚ Dan Radius 25 mm Dengan Bahan Pleksiglass ]]>
<![CDATA[Kms. Ridhuan]]>
<![CDATA[ JURNAL MECHANICAL Vol 3, No 1 (2012) ]]>
Publisher : <![CDATA[Jurusan Teknik Mesin, Fakultas Teknik, Universitas Lampung ]]>
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<![CDATA[Abstract Tests with the fluid flow pattern visualization kerosene (kerosene)-water through a pipe with a T-junction has been performed at the Laboratory of Fluid Mechanics, Faculty of Engineering, Gadjah Mada University. Tests performed on the test section of T-Junction with an angle of 90 ˚ and 25 mm bend radius. Fleksiglass material with a diameter of 1.5 inches with kerosene (kerosene) and water as working fluid. To determine the flow pattern is done by kerosene and set the superficial velocity of water. Kerosene superficial velocity (Jk) and superficial velocity of water (Jw) that flowed in the test section is set by using a valve and measured using flow meters at a range of values Jk = 0.10 m / s - 0.22 m / s and Jw = 0 , 10 m / s - 0.40 m / s. Flow patterns that occur during the research process was recorded by using cameras and observed visually with the movement slowed. As a result, it is known that the flow pattern occurring in this study is stratified (S), Stratified Wavy (SW), Three Layer (3L), Stratified Wavy Water in Oil (SWw / o), and dispersed (D). For kerosene-water separation of the most well occur in Stratified Wavy flow pattern at a speed suprfisial kerosene (Jk) 0.14 to 0.18 m / s and superficial velocity of water (Jw) 0.15 to 0.25 m / s. In the superficial mixture velocity (Jmix) 0.34 to 0.43 m / s. And for kerosene-water separation of the less well occur in dispersed flow pattern (D) velocity suprficial kerosene (Jk) 0.12 m / s down and 0.20 m / s upward. Superficial velocity of water (Jw) 0.15 m / s down and 30 m / s upward. In the superficial mixture velocity (Jmix) below 0.56 m / s. And on top of 0.60 m / s.Keywords: flow patterns, kerosene-Water, T-junction.]]>
<![CDATA[Kekuatan Geser Dan Integritas Struktur Sambungan Fillet Weld Pada Support Lug Bejana Tekan Silinder Vertikal ]]>
<![CDATA[Destarius Mahardhika]]>;
<![CDATA[Asnawi Lubis]]>;
<![CDATA[Jamiatul Akmal]]>
<![CDATA[ JURNAL MECHANICAL Vol 11, No 2 (2020) ]]>
Publisher : <![CDATA[Jurusan Teknik Mesin, Fakultas Teknik, Universitas Lampung ]]>
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DOI: 10.23960/mech.v11.i1.202010
<![CDATA[Bejana tekan merupakan wadah tertutup yang dirancang untuk menampung cairan atau gas dengan temperatur yang berbeda dari temperatur lingkungan dan digunakan untuk bermacam-macam aplikasi di berbagai sector industri. Salah satu tipe bejana tekanyang banyak dipakai adalah bejana tekan silinder vertikal dengan lug supports. Support lug pada bejana tekan silinder biasanya diattach pada dinding luar silinder dengan pad menggunakan sambungan las sudut (fillet weld). Untuk sambungan seperti ini, bejana dan pad tidak terintegrasi secara sempurna, tetapi ada retak awal yang inherent pada interface bejana dan pad. Untuk beban yang berulang, retak ini dapat merambat ke welding yang pada akhirnya menyebabkan struktur sambungan mengalami kegagalan.Penelitian ini dilakukan dengan simulasi elemen hingga untuk mengkaji stress pada sambungan fillet weld vessel dan pad. Limit beban untuk welding arah vertical (aksial) dibandingkan dengan limit beban untuk welding pada arah vertical dan horizontal dan perubahan distribusi stress dan stress maksimum hasil dengan welding pada sisi vertikal dan horizontal dibandingkan dengan hasil welding arah vertikal saja. Pada simulasi ini beban yang ditinjau hanya berat bejana sendiri, tidak adab eban lain yang bekerja. Simulasi ini menggunakan software ANSYS 2019 R3 dengan element solid (SOLID187). Material yang digunakan pada support lug adalah SA 516 Gr 70 dan diasumsikan bersifat elastic perfectly plastic. Hasil simulasi menunjukkan bahwa untuk welding hanya pada sisi vertikal, limit load yang dihasilkan adalah 54889 kN. Regangan yang terjadi pada muka radial-aksial (SXY) lebih besar dari pada muka lainnya. Stress tertinggi yang dicapai adalah sebesar 1,325 kali tegangan luluh material las. Penambahan las pada sisi horizontal menyebabkan limit beban meningkat menjadi 55191 kN. Ada peningkatan limit beban sebesar 301.6 kN. Namun regangan menjadi lebih besar pada muka radial-aksial(XZ) dan hoop-aksial (YZ). Sementara stress yang terjadi pada lasan pad dan vessel justru meningkat menjadi 1,660 kali tegangan luluh material las. Tegangan yang terjadi pada arah circumferensial (SY) lebih besar daripada tegangan yang terjadi pada arah longitudinal (SZ). Pemberian lasan pada sisi horizontal mengurangi tegangan pada lasan ujung atas dibandingkan dengan hanya pemberian las hanya pada sisivertikal.]]>
<![CDATA[The Design and Making Prototype of pressing equipment for Banana with Capacities 90 kg/hour ]]>
<![CDATA[Tri Atmodjo]]>
<![CDATA[ JURNAL MECHANICAL Vol 3, No 2 (2012) ]]>
Publisher : <![CDATA[Jurusan Teknik Mesin, Fakultas Teknik, Universitas Lampung ]]>
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<![CDATA[Banana plants in Indonesia can grow well both high and lowland, from the temperate wet and dry climate. In addition to the consumption of fresh banana in Indonesia a few cultivars are also widely used as industrial raw material chips, “sale pisang” and banana flour. Many craftsmen who developed food banana in the form of sale due to ease in the manufacturing process, in addition to food enthusiasts sale high enough banana. Making banana sale in the domestic industrial scale is still mostly done by hand which is only capable of producing 20 kg / hour in the form of processed banana fruit in banana sale. So many craftsmen maker banana sale household scale industries can not buy banana in large numbers. In the manufacture of sale of banana is done manually are still many shortcomings, which measure the thickness of the sale of banana produced uneven. In general, pressing machine banana sale is a tool that changes the shape of banana from thick to thin size. By utilizing the roll rotation that drives the conveyor belt top and conveyor belt bottom of the moving direction. In this study is designed pressing sale banana toot driven electric motor with power 2 hp 1 phase with a speed of 1400 rpm. With a shaft diameter of 25 mm, the size of the pegs 10x22 mm whit a depth of 5 mm. Gear is used in this reduction type where a large number of gear as much as 115 teeth, gear motor driver as much as 9 teeth and roll gear driver as much as 15 teeth. Bearings used in the manufacture of this pressing banana sale tool is bearing 6305 ZZ C3 P6 type. Resulting of test manufacturing pressing banana sale tool conducted showed that the pressing machine capable flattens banana sale with an average size of 10.16 cm in length banana sale, with 3.3 cm and 0.36 cm thick with a capacity of 90 Kg/hour or in day (7 hour) machine capable of pressing flattens banana sale much as 630 Kg/day.Keywords: Banana plants, pressing, machine design]]>
<![CDATA[STUDI EKSPERIMENTAL TENTANG PENGARUH VARIASI RAPAT ARUS PADA HARD CHROME ELECTROPLATING TERHADAP KARAKTERISTIK PERMUKAAN BAJA KARBON RENDAH ]]>
<![CDATA[Harnowo Supriadi]]>
<![CDATA[ JURNAL MECHANICAL Vol 1, No 1 (2010) ]]>
Publisher : <![CDATA[Jurusan Teknik Mesin, Fakultas Teknik, Universitas Lampung ]]>
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<![CDATA[The objective of the research is to investigate the effect of hard chrome electroplating on low carbon steel surface characteristic. This experimental research used low carbon steel as material that has been coated by hard chrome electroplating, chromium powder, and Pb alloy as cathode. The instrument for the research were rectifier, hardness testing machine LECO M-400-H1, optical microscope and digital camera. This research had been performed by making variation of current ((15 A/dm2, 30 A/dm2, 45 A/dm2 and 60 A/dm2).The result of this research shows that the maximum hardness of low carbon steel after coated by hard chrome electroplating was 576,50 VHN, when hard chrome electroplating had been performed on current 45 A/dm2. Beside that, on the same current (45 A/dm2) also gained maximum chrome layer (38,65 µm).Keywords: low carbon steel, hard chrome electroplating, hardness, deep of coated.]]>
