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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.

Arjuna Subject : -

Articles 965 Documents

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Pengaruh Tekanan Pembriketan dan Persentase Briket Campuran Gambut dan Arang Pelepah Daun Kelapa Sawit terhadap Karakteristik Pembakaran Briket Nugraha, Andy; Widodo, Agung Sugeng; Wahyudi, Slamet
Rekayasa Mesin Vol 8, No 1 (2017)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

Briquettes mixture of peat and charcoal leaf midrib palm oil is one of the alternative energy for replacing fossil fuel energy. It is environmentally friendly and abundant in Indonesia, mainly in South Kalimantan. In this study, the percentage of briquettes mixture of peat and charcoal leaf midrib of palm oil were 50%:50%, 60%:40%, 70%:30%, 80%:20% and 90%:10%, respectively. In addition, 1 gram of starch was added as an adhesive for every variation of briquettes mixture. In briquetting process, the pressures were 10 kg/cm2, 20 kg/cm2 and 30 kg/cm2. The combustion characteristics ofÂ briquettes was tested, then it was compared by subbituminous coal briquettes. The results show, ignition delay of briquettes decrease by increasing additional percentage of peat, however extend the burning time of briquettes, consequently the burning rate decrease and the briquettes temperature becomes low. Briquetting pressure affects the combustion characteristics of briquettes. Ignition delay of briquettes decrease by the pressure. On the other hand, extend the burning time of briquettes and decrease the burning rate, however combustion temperatures of briquettes increases. The results also show a comparison of mixture briquettes peat and charcoal palm leaf midrib with subbituminus coal briquettes. The subbituminous coal briquettes produces higher combustion temperature, the longer combustion process and the lowestÂ combustion rate.Â

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.

Variasi Ukuran terhadap Kekerasan dan Laju Keausan Komposit Epoxy Alumunium-Serbuk Tempurung Kelapa untuk Kampas Rem Taka, Ario Kristian; Kristianta, FX.; Sholahuddin, Imam
Jurnal Rekayasa Mesin Vol 8, No 3 (2017)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

The aim of this research was to investigate the influence of the particle size of coconut shell powder on hardness and wear rate om aluminium epoxy based composite. Experimental method was used in this study by using four configurations of particle size. The configuration includes comersial powder and particle size of 300 Âµm, 425 Âµ and 600 Âµm. The results showed that the highest and smallest hardness value obtained by 300 Âµm of 63.67 kg/mm2 and 600 Âµm is 41.67 kg, respectively. However, the highest and smallest wear rate obtained by 600 Âµm is 8,70 x 10-6 gram/s.mm2 and 300 Âµm is 1,17 x 10-6 gram/s.mm2, respectively. This phenomena occured due to the coconut shell powder size of 300 Âµm is well and uniformly spread.

Analisis Sifat Fisik dan Kompresibilitas Nanopowder Zinc Oxide (ZnO) sebagai Alternatif Material Amalgam Qosim, Nanang; Murdanto, Putut; Puspitasari, Poppy
Jurnal Rekayasa Mesin Vol 9, No 1 (2018)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

Severe effects of the mercury use on health as an amalgam material have required an alternative material in order to eliminate it from amalgam composition. This research was conducted to analyze the physical properties and compressibility of ZnO nanopowder as an alternative amalgam material. The physical properties including morphology, dimensions, and the atomic ratio were analyzed by SEM, XRD-XRF and EDX. Further, the compressibility was conducted by using hydraulic press machine. The results showed that ZnO has particle size of 14.34 nm with morphology classified as nanorods. In the compressibility test, both the variation of compression loadings and holding time have brought an effect on the significant increase of ZnO nanopowder density.

Pengaruh Variasi Sambungan pada Crash Box Multi Segmen terhadap Kemampuan Penyerapan Energi dengan Uji Quasi Static Halman, Halman; Choiron, Moch. Agus; Darmadi, Djarot B.
Jurnal Rekayasa Mesin Vol 9, No 1 (2018)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

Along with the elevating number of cars, accidents due to car crashes are increasing. Therefore, technology is needed to reduce the occurrence of the driversâ€™ injuries. Crash box is one of the potential passive safety technology which is widely observed today. Crash box is installed between bumper and chassis, aims to reduce the cassualties when the car crashes. In this article, crash box research was conducted by real experimental method through quasi-static test to evaluate the energy absorption capability of circular-shaped multi-segment crash box. Crash box material was made from aluminum A6063. The connection on each segment is a chamfer with 45o angle. The connections between segments 1 and 2 were varied with 3 connection models, those are 1/4, 1/3 and 1/2 of the total length, i.e.120 mm. The results of the study showed that, the highest energy absorption obtained from the crash box with connection of 1/2 and the energy absorption is 5249.726 J. Crash box type of 1/4 and 1/3 exhibit energy absorption of 3886.238 J and 3106.027 J respectively. Generally, the deformation pattern on the crash box is mixed-mode (axisymmetric-diamond).Â

Analisis Pemodelan Sistem Hibrid Proton Conducting Solid Oxide Fuel Cell (pSOFC) â€“ Turbin Gas Mikro Pada Matlab-Simulink Pranoto, Bayu; Tseng, Chung-Jen; Wardana, ING
Rekayasa Mesin Vol 7, No 1 (2016)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

This study simulated Proton Conducting Solid Oxide Fuel Cell (pSOFC) â€“ Micro Gas Turbine (MGT) hybrid system on three different configuration. The first configuration use bypass hot gas from combustor going to fuel heater without Â pass the turbine first. The second configuration use bypass hot gas out of turbine going to fuel heater. The third configuration is combined bypass out of combustor and also bypass out of turbine. The performance of these system are analyzed by using variation of operating pressure, fuel utilization (Uf), steam to carbon ratio (S/C), and bypass valve. Moreover, the impact of different bypass position were also evaluated. The result shows that the efficiency of using a double bypass hot gas flow after combustor and turbine is about 67%. This configuration became the best one among of another two configuration which proposed in this research. Â The utilization of heat by using a double bypass hot flow gas after turbine and combustor has proven more effective to increase the system efficiency. Means that it can reduce the heat losses of the system.

Performansi Purifikasi Biogas Dengan KOH Based Absorbent Hermawan, Dadang; Hamidi, Nurkholis; Sasongko, Mega Nur
Jurnal Rekayasa Mesin Vol 7, No 2 (2016)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

The absorpstion of CO2 is aimed to increase the methane gas fraction in biogas. Enhancing methane fraction hopefully will increase the total energy of the biogas it self. The purification process of biogas minimizing another elements maintains combustion, especially minimizing H2O, CO2, and H2S. The purification using KOH as the absorbent to decrease the CO2. The result shown that the content of CO2 decreased into 27% from 35.5%, the average content of CH4 increased from 18% to 48.5%. Increasing KOH composition decreases bubble generator diameter and mass flow.

Analysis of Proton Conducting SOFCâ€“Micro Gas Turbine Hybrid System with Anode and Cathode Recycling and Fueled by Ethanol Sasmoko, Sasmoko; Tseng, Chung-Jen; Wijayanti, Widya
Jurnal Rekayasa Mesin Vol 7, No 3 (2016)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

This paper presents a hybrid system that consists of a pSOFC (proton conducting SOFC) stack, a micro gas turbine (MGT), a combustor, a compressor, a heat exchanger, and an external steam reformer. This simulation is based on thermodynamic analysis and is developed using Matlab/Simulink/Thermolib software and validated using published data from the literature. Furthermore, three cases, cases 1, 2, and 3, are analyzed, and the best case, case 2, is installed with anode and cathode recycling, to increase system performance. According to the results, case 2 exhibits the highest system efficiency (72%) due to high hydrogen production, and the installation of anode and cathode recycling further increases system efficiency up to 79%.

Aplikasi Serbuk Arang Tongkol Jagung dan Serbuk Cangkang Kerang Mutiara sebagai Media Carburizer Proses Pack Carburizing Baja Karbon Rendah Darmo, Sujita Darmo
Jurnal Rekayasa Mesin Vol 7, No 3 (2016)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

Carburizing process on low carbon stell can be done by using carburizer of corncob charcoal, pearl oyster shell powder. Cylindrical low carbon steel of AISI 1018 was used in the present study. The materials put inside the pack carburization with carburizer and pearl oyster shell powder. The pearl oyster shell powder varies of 5, 10, 20, and 25 weight percentage. The temperature of 910oC, 930oC, and 950oC was used to heat the materials with holding time of 90 and 150 minutes. Then, hardness Vickers test and microstructure test using scanning electron microscope (SEM) was used to analyze the hardness number of each materials. The results shown that the hardnessnumber increased up to 262,47 kg/mm2 (82 %) from 144,08 kg/mm by adding 20 % weight of pearl oyster shell powder with heating and holding time of 950oC and 150 minutes, respectively. From microstructure and composition test reveal that surface hardening occurred on the low carbon steel surface due to carbon diffusion during pack carburizing process.

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

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Jawa timur

INDONESIA