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Jurnal Mechanical
Published by Universitas Lampung
ISSN : 20871880     EISSN : 24601888     DOI : https://doi.org/10.2960/mech
Core Subject : Science, Engineering,
Engineering Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mechanical Engineering
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 .
Arjuna Subject : Teknik (semua kategori) - Teknik Mesin
Articles 234 Documents
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Konsep Proses Pemesinan Berkelanjutan Gusri Akhyar Ibrahim
JURNAL MECHANICAL Vol 4, No 2 (2013)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Lampung

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Abstract

Metal industrial machining usually strongth pressure from all sectors, ether raw material industries or user metal industries. Manufacturint process which offered to all sectors industries  or companies that sustainable manufakturing consist of three main factor are efective cost, enviroment and social performance. Keywords: Sustainable, machining, social, enviroment, cost.
Pengaruh Rasio Panjang dan Diameter Pipa Suplai terhadap Unjuk Kerja Model Pompa Tanpa Motor (Hydraulic Ram Pump) Jorfri B Sinaga
JURNAL MECHANICAL Vol 2, No 2 (2011)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Lampung

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Abstract

A hydraulic ram pump is environmentally friendly devices using the energy from a stream of water falling from a low head as the driving power to pump part of the water to a head much higher than the supply head for agricultural or domestic use. In the use of this pump, one of factors that influence the performance is ratio of drive pipe length to diameter (L/D). This paper presents the experimental study of effect of ratio of drive pipe length to diameter on hydraulic ram pump designing model. This hydraulic ram pump designing model is tested on various ratio of drive pipe length to diameter, namely 158, 165, 176, and 202. The results of the testing of the model hydraulic ram pump shows that the operation of this pump should  use the ratio of drive pipe length to diameter (L/D) of 176. Using supply head of 1 m and volume of air chamber of 5702,754 cm3, water can be pumped with the volume flow rate of 3 lit/min to the height of  8,5 m, and the efficiency of this pump is 78,7  %. The data of the testing results also show that using the volume of air chamber of 4562,203 cm3, and supply head of 1 m, this model of hydraulic ram pump can lift water of 2,727 lit/min  to the height of 9,5 m with the maximum efficiency of 87,96 %..
Redesign of Pneumatic Piston Using Design for Manufacture and Assembly (DFMA) Technique Mustofa .
JURNAL MECHANICAL Vol 1, No 1 (2010)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Lampung

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Abstract

Design for Manufacture and Assembly (DFMA) technique has been utilized intensively in industry for many years in order to increase the quality, decrease the cost and shorten the cycle time of a product. This  paper is a detail application of the technique in the pneumatic piston product. The redesign effeciency of the product increases significantly from 25.9% to 67.45%. Keywords: manufacture and assembly
Aplikasi Cairan Pelumas Pada Pengeboran Pelat ASTM A1011 Menggunakan Mata Bor HSS Arinal Hamni
JURNAL MECHANICAL Vol 5, No 2 (2014)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Lampung

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Abstract

Perkembangan ilmu terapan di bidang industri manufaktur terus bergerak hingga kemajuan teknologinya, salah satu bidang yang mengalami perkengan pesat itu adalah bidang permesinan. Proses permesinan yang dilakukan secara terus menerus misalnya pada pengeboran akan menyebabkan aus nya mata bor yang digunakan, karena adanya peningkatan suhu pemesinan. Penggunaan beberapa jenis cairan pendingin seperti oli sintetis dan minyak kelapa diharapkan dapat menurunkan suhu permesinan sehingga mengurangi keausan yang terjadi pada mata bor HSS yang digunakan. Diaplikasikan dengan cara menyemprotkan cairan pelumas secara terus-menerus pada permukaan benda kerja yang bersinggungan dengan mata bor pada kecepatan putaran (n) konstan pada 443 rpm, sedangkan variasi pada gerak makan (f) sebesar 0.1 mm/rev, 0.18 mm/rev serta 0.24 mm/rev. Umur pakai mata bor yang didapat pada pengujian tanpa pelumas dengan putaran (n) = 443, gerak makan (f) = 0.1 mm/rev serta nilai keausan mata bor (vb) = 0.3 mm adalah 2.02 menit. Untuk penggunaan oli sintetis dengan kecepatan putaran dan gerak makan yang sama, didapat umur pakai mata bor selama 4.71 menit atau meningkat sebesar 54%. Peningkatan itu dibandingkan pada proses pengeboran tanpa menggunakan cairan pelumas. Sedangkan dengan penggunaan minyak kelapa, umur pakai mata bor selama 4.05 menit atau meningkat sebesar 48%. Dengan demikian nampak jelas bahwa penggunaan cairan pelumas mampu menurunkan tingkat keausan mata bor, terutama pada penggunaan oi sintetis. Kata kunci: aus, HSS, suhu, pengeboran, pelumas.
Studi Konsumsi Bahan Bakar Mesin Gokart 150cc dengan Variasi Nilai Oktan Bahan Bakar Abel Fuadi; Agung Sudrajad; Imron Rosyadi
JURNAL MECHANICAL Vol 12, No 1 (2021): Maret 2021
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Lampung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23960/mech.v12.n1.202103

Abstract

Petrol fuel is a very inexpendable resource of energy to move or operate a machine to work as it could be. There were so many kinds of fuel such as pertamax, pertamax turbo, and avgas, with each other has a different octane number. Fuel consumption is affected by so many factor, few between them arethe difference between their octane number. The purpose of this study is to found the consumption value of 150cc gokart engine with an octane number variant. This experiment test the specific fuel consumption and air fuel ratio of the engine mentioned above when using different fuel like pertamax, pertamax turbo, and avgas, as all of them tested using dynotest, which connected to computer to track their power value of each fuel used linearly with Rpm increase, idle Rpm, 3000, 5000, 7000 and 9000 Rpm. For specific fuel consumption count based on time needed to emptying each of the fuel tested. From the research, found that specific fuel consumption value was 680 gram/Kwh for pertamax fuel, 357 gram/Kwh for pertamax turbo fuel, and 675 gram/Kwh for avgas. In this research, the factor that affects the specific fuel consumption is the difference between octane number of each fuel type 
Rancang Bangun Alat Sortasi Gabah Menggunakan Motor Bakar Dengan Kapasitas 5 HP Noviana Nurhikmat; Kardiman Kardiman; Najmudin Fauji
JURNAL MECHANICAL Vol 12, No 1 (2021): Maret 2021
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Lampung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23960/mech.v12.n1.202104

Abstract

Gabah merupakan hasil buah panen dari tanaman padi disawah. Gabah ini diolah untuk menjadi beras yang biasa digunakan untuk makanan pokok kita sehari-hari. Beras ini dimasak untuk dijadikan konsumsi pangan bagi kita. Sebelum beras bisa dikonsumsi, gabah yang merupakan hasil panen harus diolah melalui beberapa tahap. Maka dari itu penulis merancangan alat untuk mempermudah proses penyortiran gabah menjadi beras. Alat yang dibuat mempunyai bentuk minimalis dengan tenaga motor 5 HP dengan bantuan mata pisau roll yang bisa diatur kerenggangan gesekan dengan mata pisau tetap. Proses produksi menghasilkan 54.5 kg beras, rendemen 71.4 % dan efisisensi 41.7 %.Kata kunci :  Efisiensi; Gabah; Produksi; Rendemen
The Penetration Depth Of Weld Metal In Underwater Welding With Variations In Water Depth And Water Flow Velocity Fajar Paundra; A. Juan; Triyono Triyono; P. Elmiawan; P. Yunesti
JURNAL MECHANICAL Vol 12, No 1 (2021): Maret 2021
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Lampung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23960/mech.v12.n1.202105

Abstract

Underwater wet welding (UWW) is widely used in the repair of offshore construction and underwater pipelines using the Shielded Metal Arc Welding (SMAW) method. This research was conducted to see the effect of flow (0 m/s, 1 m/s, and 2 m/s) and water depth (2.5 m and 5 m) on the depth weld metal penetration of the SS400 steel underwater welded joints. The control variables used were welding speed of 1.5 mm/s, current of 90 A, electrode E6013 (RB26) with a diameter of 4 mm, type of negative electrode polarity (DC), spraying distance of 10 cm, the direction of spraying in the opposite direction of welding, and fresh water. The results showed that the deeper and fast the flow velocity would decrease the depth of penetration and increases porosity. This is due to the decreased transferability of the molten metal during the welding process.
Uji Performa Mesin Gokart 150 CC Dengan Variasi Beban dan Putaran Mesin Galang Muhamad Refli; Agung Sudrajad; Imron Rosyadi
JURNAL MECHANICAL Vol 12, No 1 (2021): Maret 2021
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Lampung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23960/mech.v12.n1.202101

Abstract

AbstractGokart is a four-wheeled simple vehicle, which right now commonly being used as an early stage of racing cause it could train the reflexes of their driver, the decision making and other skills. Gokart usually powered by a two-stroke or four-stroke engine. In gokart racing, other than their driver, engine performance is such a big factor for the race result. The equipment for measure or achieve how much the performance above is called dynamometer, or commonly called “dynotest”. This research is focusing on knowing the engine performance (torque and power) on 150cc petrol-powered two-stroke engine with variation of main jet load of 155, 160 and 165 in 4000 Rpm to 13.000 Rpm. This research is conducted with chassis dynamometer test equipment to get the result of performance data measured by test equipment. From the result of the experiment on lower torque, the power output were so low and could reach maximum followed by engine’s rotation (Rpm), after reaching its peak rpm it will decreasing gradually on higher Rpms. From this research, the best torque is when using a 160 main jet with 16 Nm torque at 10.000 Rpm. Meanwhile, while using a 155 main jet, the torque were decreased by 6,25% and 6,87% while using a 165 main jet. Best power achieved when using a 160 main jet with power of 23,9 HP at 12.000 Rpm. Whereas with a 155 main jet, the power decreased by 4,6% and with a 165 main jet, the power decreased by 1,67%.Keywords: Chassis Dynamometer, Main Jet, Rpm, Torque and PowerAbstrakGokart adalah kendaraan roda empat yang sederhana, gokart biasanya menjadi prasyarat awal untuk kompetisi balap yang lebih besar karena dapat membantu menyiapkan reflek pembalap, mempercepat pengambilan keputusan dan keterampilan. Gokart biasanya digerakkan oleh mesin dua langkah atau empat langkah. Dalam balap gokart, selain pembalap, performa mesin juga sangat menentukan hasil dari balap gokart. Alat yang digunakan untuk mendapatkan atau mengukur besaran performa diatas biasa disebut dynamometer atau lebih dikenal dengan metode dynotest. Penelitian memfokuskan untuk mengetahui performa mesin (torsi dan daya) pada gokart bermesin bensin 2 langkah 150cc dengan variasi beban main jet 155, main jet 160 dan main jet 165 pada putaran mesin 4.000 RPM – 13.000 RPM. Penelitian dilakukan dengan menggunakan alat uji chassis dynamometer untuk mendapatkan data performa yang dapat terukur pada alat uji. Dari hasil eksperimen yang dilakukan pada putaran rendah torsi dan daya yang dihasilkan kecil dan terus akan mencapai maksimum mengikuti kenaikan putaran mesin, setelah mencapai maksimum akan menurun secara perlahan dan terus menurun pada putaran yang lebih tinggi. Hasil penelitian didapatkan torsi terbaik menggunakan main jet 160 dengan nilai torsi 16 Nm pada 10.000 RPM. Sedangkan torsi dengan main jet 155 turun 6,25% dan dengan main jet 165 turun 6,87%. Daya terbaik menggunakan main jet 160 dengan nilai daya 23,9 HP pada 12.000 RPM. Sedangkan dengan main jet 155 turun 4,6% dan dengan main jet 165 turun 1,67%.Kata kunci: Chassis dynamometer, main jet, RPM, torsi dan daya
Analisa Emisi Gas Buang dan Bunyi Mesin Gokart 150 cc dengan Variasi Bahan Bakar dan RPM Reza Anugrah Yulian; Agung Sudrajad; Imron Rosyadi
JURNAL MECHANICAL Vol 12, No 1 (2021): Maret 2021
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Lampung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23960/mech.v12.n1.202102

Abstract

Gokart were so popular on competition scene in Indonesia, using a two-stroke engine with an engine specification being regulated in race regulation. But for now, not only a two-stroke engine, many four-stroke engine gokart race held as it was safer for their driver and environment. It is necessary to do research on emissions and noise emmision so that they can be used as a reference in karting competitions and to maintain the safety of many people involved in the race. Emmision gas test conducted using gas analyzer, while for the noise emmision test using sound level meter. Data taken when the gokart engine in standby, neutral gear. Fuel kinds are the variants of this research, as different fuel means different octane number, such as Pertamax (92), Pertamax Plus (98) and Avgas (102), with data being taken at idle rpm, 3000, 5000, 7000 and 9000 for each different fuel. Data desired were CO, HC, O2, CO2, NOX gas concentration, while for the noise were the decibel value produced by engine. Best result achieved when using Pertamax Plus (98) for emmision gas, which is having emmision gas concentration of CO, HC, O2, CO2, NOX, with a value of 2.25%, 6012.4ppm, 1.98%, 14.33%, and 30.8ppm respectively. Worst result achieved when using Avgas (102), which is having emmision gas concentration of CO, HC, O2, CO2, NOX, with a value of 1.636%, 8849ppm, 0.42%, 17.63%, dan 19ppm respectively. While the noise emmision value based by engine rotation speed, which the speed affects the noise emmision as 1-5 db increasing for each 2000 Rpm increase. While looking for an octane number as a reference, the noise emmision value increase from 1 until 2 for each increase of the fuel octane number.Keywords: Emmision gas, noise emmision, two-stroke engine, gas analyzer, sound level meter.
Performansi Mesin Pendingin Tipe Chiller untuk Cold Storage dan Indoor Menggunakan Ethylene Glycol Coolant Azridjal Aziz; Hendrik Syahputra; Rahman Putra Mainil; Afdhal Kurniawan
JURNAL MECHANICAL Vol 6, No 2 (2015)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Lampung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23960/mech.v6.i2.201510

Abstract

AbstractRefrigeration device is used to reduce the temperature of the room or cooled material by absorbing heatfrom the room/material. The most refrigeration device operated by using the vapor compression refrigerationcycle. This research was done experimentally using refrigeration device chiller type to cool the ethylene glycolcoolant in the refrigeration box (evaporator unit), and ethylene glycol coolant is used to absorb heat in coldstorage and indoor (test room). The results show for the circulation of ethylene glycol coolant to the coldstorage COP value is 2.80, while the circulation of ethylene glycol coolant to the indoor COP value is 5.12. Onthe testing of ethylene glycol coolant was circulated to the indoor with 1000 Watt cooling load, the COP value is5.19, and for circulated to the cold storage and indoor simultaneously COP is of 3.66. The performance ofchiller refrigeration device is influenced by the cooling load, the greater of cooling load that would affect thework of the compressor so that the pressure in compressor increase and the energy consumption to operate thecompressor also increasing too.Keywords: refrigeration, heat, COP, PF, cooling load.

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