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Rekayasa Mesin

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Published by Universitas Brawijaya

ISSN : 23381663 EISSN : 24776041 DOI : 10.21776/ub.jrm

Core Subject : Engineering,

Mechanical Engineering

Rekayasa Mesin is published by Mechanical Engineering Department, Faculty of Engineering, Brawijaya, Malang-East Java-Indonesia. Rekayasa Mesin is an open-access peer reviewed journal that mediates the dissemination of academicians, researchers, and practitioners in mechanical engineering. Rekayasa Mesin accepts submission from all over the world, especially from Indonesia. Rekayasa Mesin aims to provide a forum for national and international academicians, researchers and practitioners on mechanical engineering to publish the original articles. All accepted articles will be published and will be freely available to all readers with worldwide visibility and coverage. The scope of Rekayasa Mesin are the specific topics issues in mechanical engineering such as design, energy conversion, manufacture, and metallurgy. All articles submitted to this journal can be written in Bahasa and English Language.

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Articles 8 Documents

Search results for , issue "Vol 8, No 2 (2017)" : 8 Documents clear

Boron Doped Graphene 3-Dimensi untuk Superkapasitor Kapasitas Tinggi Sari, Nurlia Pramita; Sonief, Achmad As'ad; Ching, Yuan Su
Rekayasa Mesin Vol 8, No 2 (2017)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

Chemical doping is an effective approach to improve the property of carbon material. In this study boron doped graphene with 3D structure used as the electrode was investigated. Boron doped graphene was prepared through freeze-dried process followed by pyrolysis of graphene oxide (GO) with three types of chemical substances; boron oxide, boric acid, and boron powder in an argon and hydrogen atmosphere at 1000 C for 3 hours. The difference of chemical composition generated a different percentage of boron bond with GO. The results shows that the highest electrochemical performance was found in graphene samples with the addition of boric acid (BA) 86 F/g, followed by boron oxide (BO) 59.2 F/g, and boron powder (BP) 2 F/g. It can be caused by boron concentration bound with graphene. The higher concentration of boron could be increased the electrochemical performance due to better of ion movement.

Simulasi Numeris Karakteristik Pembakaran CH4/CO2/Udara dan CH4/CO2/O2 pada Counterflow Premixed Burner Wicaksono, Hangga; Sasongko, Mega Nur; Widhiyanuriyawan, Denny
Jurnal Rekayasa Mesin Vol 8, No 2 (2017)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

The high amount of CO2 produced in a conventional biogas reactor needs to be considered. A further analysis is needed in order to investigate the effect of CO2 addition especially in thermal and chemical kinetics aspect. This numerical study has been held to analyze the effect of CO2 in CH4/CO2/OÂ2 and CH4/CO2/Air premixed combustion. In this study one dimensional analisys in a counterflow burner has been performed. The volume fraction of CO2 used in this study was 0%-40% from CH4â€™s volume fraction, according to the amount of CO2 in general phenomenon. Based on the flammability limits data, the volume fraction of CH4 used was 5-61% in O2 environment and 5-15% in air environment. The results showed a decreasing temperature along with the increasing percentage of CO2 in each mixtures, but the effect was quite smaller especially in stoichiometric and lean mixture. CO2 could affects thermally (by absorbing heat due to its high Cp) and also made the production of unburnt fuel species such as CO relatively higher.

Penentuan Critical Parts Alat Bantu Pemeras Santan Menggunakan Quality Function Deployment Fase Kedua Hadi, Yuswono; Dahlan, Ahmad Faishal
Jurnal Rekayasa Mesin Vol 8, No 2 (2017)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

Some previous studies used QFD first phase method to obtain customer satisfaction of coconut milk squeezer machines, as follows: accelerates extortion process, reduces fatigue, easy to use, optimizes the output, strong construction, rustproof materials, compact design, easy to move, and hygienic. Study developing of the squeezer machine of coconut milk is required to deploy customer satisfaction into two parts including specifications and critical parts by using QFD second phase. There are 15 part specifications that obtained by discussing and interviewing with the experts. Then, 4 part specifications such as motor, pressing mechanism, production step, pressing strength, and volume of the cylinder were selected as main part to be used for QFD second phase. While there were 10 critical parts was derived from selected part specification such as pressure strength, hydraulic system, ON/OFF push button, cylinder clamps, the power and voltage that used for the machine,Â the piston holder material, and its diameter.

Karakteristik Komposit Serat Kulit Pohon Waru (Hibiscus Tiliaceus) Berdasarkan Jenis Resin Sintetis terhadap Kekuatan Tarik dan Patahan Komposit Fadhillah, Arief Rizki; Setiyabudi, Sofyan Arief; Purnowidodo, Anindito
Rekayasa Mesin Vol 8, No 2 (2017)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

The fiber composite of hibiscus's bark is the material that comprises synthetic resin as a matrix and hibiscus's bast fiber as reinforcement. The hibiscus's bast fiber have the excellent potency regarding the strength that is employed as reinforcement. Four types of synthetic resin were used in this study, polyester BTQN 157, bisphenol A LP-1Q-EX, ripoxy R-802, and epoxy. The ratio of mass fractions between fiber and resin was 60:40. The initial treatment of the bast fiber hibiscus was immersed in 6 % of NaOH solution for two hours. The composites were manufactured through vacuum bagging process. Tensile strength and fracture mode of composites were investigated. The fiber composites of hibiscus tree bark with bisphenol A LP-1Q-EX resin has the best tensile strength and epoxy resin have a small fracture area was obtained.

Rancang Bangun Mesin Pengiris Talas Semir Sugandi, Wahyu; Yusuf, Asep; Thoriq, Ahmad
Rekayasa Mesin Vol 8, No 2 (2017)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

Talas semir is a superior commodity in Sumedang. Talas semir can be made into various type of snacks such as chips. The best quality of Talas semir chips can be produced by using the best cutting machine. Based on some experimental results of the cutting machine for producing talas semir chips, the design of cutting machine was not ergonomic. The machine was uncomfortable to be operated. This study aims to designing and creating the ergonomic cutting machine for producing talas semir chips. This machine consists of cutter, operator seat, product holder, axis of cutter disk, electric motor and transmission systems including belt and pulley. Based on the experiment, the theoretical and actual machine capacity are 47 kg/jam and 38 kg/jam, respectively. Whereas, the efficiency of this machine is 81%. By using this machine, the best quality of talas semir chips is produced aproximately 80% and 530 watt power is required.

Pengembangan Wearable Robotic Arm Input dan Virtual Instrument untuk Pengendalian dan Pemantauan Lengan Robot Ekaputra, I Made Wicaksana; Setiawan, Joga Dharma
Jurnal Rekayasa Mesin Vol 8, No 2 (2017)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

This paper investigate the integration of wearable robotic arm input (WRAI) with virtual instrument (VI) for controlling and monitoring the manipulator. The WRAI was designed by following the contours of human arms and equipped with five potentiometers as the sensor. The sensors were placed properly on WRAI by considering the ergonomic aspect. Each sensor on WRAI actuate each joint on the manipulator. The manipulator has five degrees of freedom (DOF) which consists of five revolute joints. For monitoring process, control panel of VI was created suitably by LabVIEW, and its block diagram was mainly programmed by following the forward kinematics approach. The VI obtains the input signal from the rotation of potentiometer on WRAI, and then transmitted to the receiver on manipulator to actuate the joints. By monitoring the control panel, the user can observe each angle joint on manipulator and also the position and orientation of end effector. The test results show the WRAI performs good controllability and ergonomic. The WRAI can control the manipulator easier than using remote control and joystick. Further, the control panel of VI is able to simplify the monitoring process by the friendly user interface.

Pengaruh Rasio Step pada Sudden Enlargement Channel terhadap Heat Flux Kondensasi di Porous Media Praswanto, Djoko Hari; Siswanto, Eko; Hamidi, Nurkholis
Jurnal Rekayasa Mesin Vol 8, No 2 (2017)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

One of the most significant parameter in air conditioning problems is air humidity. A porous media can be used as a heat exchanger component in order to increase the heat transfer performance which is significantly depends on the heat flux values inside of them. To determine the heat flux value, a following test section was modeled in this research. A vapor passed through a channel whereas a particular porous media made of active carbon acted as its heat exchanger media. However, the sudden enlargement at the inlet of channel could affect the homogeneity of temperature distributions and also caused some several turbulencies. The research method is vapor flowed over the porous media for 60 minute with temperature of 300oC.The vapor velocity is varied from 1 m/s to 3 m/s and the step ratio also varied between 0 until 1.66. From the experiment shows the bigger step ratio and vapor velocity results the bigger heat flux and air humidity after passed through the low porous media. Heat transfer was occured in porous media including convection heat transfer with the value of Gr/Re2 smaller than 1.

Pembentukan Titanium Nitrida (TiN) dengan Proses Nitriding pada Titanium Murni Menggunakan Plasma Densitas Tinggi Windajanti, Josephine Maria; Santjojo, Dionysius Joseph Djoko Herry; Abdurrouf, Abdurrouf
Jurnal Rekayasa Mesin Vol 8, No 2 (2017)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

Pure titanium has been widely utilized in industry but its products suffered from low wear and erosion resistance. The plasma nitriding was selected as a tool to harden the pure titanium products but typically high temperature processing was required to attain high hardness. In the present study, high density plasma nitriding system was applied to make low temperature plasma nitriding at 723 K (or 450Â°C) for 14.4 ks (or 4 hours).Â The average measured hardness reached to 624 HV.Â This high hardness of plasma-nitrided pure titanium at low temperature was attributed to formation of fine TiN precipitates and nitrogen solid solution into vacancy sites in the HCP crystalline structure of titanium.

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Redaksi Jurnal Rekayasa Mesin Jurusan Teknik Mesin Fakultas Teknik, Universitas Brawijaya Jl. MT. Haryono 167 Malang, Jawa Timur Indonesia 65145

Location
Kota malang,

Jawa timur

INDONESIA