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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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Analisa Perbandingan Karakteristik Bodi dan Chassis pada Prototype Kendaraan Listrik Dwinanto, Arya Yudistira; Muhammad, Fadhil Burhanuddin
Jurnal Rekayasa Mesin Vol 6, No 2 (2015)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

In the design of electric vehicles prototype, there are many things that must be taken intoÂ account and considered to be used completely without danger and failure in materials. InÂ general, they are the design of body, chassis or frame design, the design of the transmissionÂ system, the design of the engine (motor), and the design of electrical installations. VehicleÂ chassis monocoque has a lighter weight compared to the vehicle chassis with a ladder. TheÂ weight of the vehicle has a considerable effect on the efficiency of the motor in which the motorÂ work harder. Body vehicle glass fiber and carbon fiber also has a weight that is much different.Â With the same frame, the vehicle weight is obtained with a machine that utilizes carbon fiberÂ body and fiber glass 43 kgf and 54 kgf. Excess carbon fiber monocoque chassis can beÂ combined to produce the weight of the vehicle 36 kgf.

Rancang Bangun Alat Roll Press untuk Mengolah Batang Tanaman Rumput Payung (Cyperus Alternifolius) menjadi Serat Bahan Baku Komposit Murdiyanto, Danang; Redationo, Nereus Tugur
Jurnal Rekayasa Mesin Vol 6, No 2 (2015)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

Composite material could be developed into new material that would be useful for many interests. Fiber as composite raw material must be given pretreatment to improve the quality of composite. In this research, raw material for the composite was umbrella grass (Cyperus Alternifolius). A tool was designed to facilitate the processes of rolling or pressing, or abbreviated as roll press. Indeed, the design of roll press was preceded by designing the construction section that involved shaft, transmission system, bearing, pulley belt, and driver motor to move the roll. Result of rolling must be suitable for processing umbrella grass into the fiber of composite raw material. Testing was conduced to examine the work of the tool against the stalk of umbrella grass. Two testing was considered. First was testing against the variation of loads, which involved 10kg, 12kg and 14kg. Second test was against the variation of roll rotation at 160rpm, 197rpm and 280 rpm. Result of both tests provided specific fiber derived from umbrella grass that would be compatible to be composite material. Some results of research were indicated. Main drive motor was Â½ PK with rotation (n1) = 1430rpm. Pulley diameter (d1) was 75mm. Reducer system was signified by n2 = 831rpm and d2 = 129mm, and if d3 = 59mm was used, the outcome was n4 = 160rpm with d4 = 307mm. In case of bearing, its sliding moment was 0.309N.mm and tangent force was 2.06N. The frame of roll press tool was designed at the dimension of length x wide x height = 600mm x 320mm x 1200mm. The best parameter was 160rpm with load force of 10kg. By taking account all these results, it could be said that the result of roll press processing had successfully produced the fiber from umbrella grass into the suitable raw material for the composite.

Analisis Perbandingan Metode Pengujian Kekasaran Permukaan pada Material Polimer Dan Komposit - Review Prasetyo, Dimas Eko
Jurnal Rekayasa Mesin Vol 6, No 3 (2015)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

The development of composite materials can be combined with the test material to obtain a composite material properties such as strength, hardness, wear, and surface roughness. The surface roughness of polymeric materials and composites can be tested in many ways, ranging from tactile method (profile measurement), focus variation (area measurement), fringe projection (area measurement), confocal laser scanning microscope (area measurement), and several other methods. Varied roughness testing on the surface will be compared to obtain the most suitable testing method to obtain the roughness of hybrid composite and composite ceramic specimens. The method used in this study is literature review. For hybrid composite material will be less suitable when using tactile method because of hybrid composite having a lower surface hardness. Additionally hybrid composite has a porosity value greater than the ceramic composite. This causes hybrid composite is more rugged than ceramic composite. Therefore with greater porosity will be suitable when using the roughness measurement with a microscope device such as fringe projection (area measurement), and confocal laser scanning microscope (area measurement).

Analisis Perpindahan Panas pada Kolektor Pemanas Air Tenaga Surya dengan Turbulence Enhancer Ramadhan, Muhammad Nizar; Soeparman, Sudjito; Widodo, Agung Sugeng
Rekayasa Mesin Vol 8, No 1 (2017)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

One of the solar energy utilization is solar water heater. To improve the performance of solar water heater, modifications were applied to dual absorber plate and flow channels to increase heat absorption. The aim of this study is to analyze the heat transfer of the collector solar water heater with additional modifications turbulence enhancer. Flowrate of water were varied to 1500 ml/min, 1200 ml/min, 900 ml/min, and 700 ml/min. The result shown that Â the highest collector energy loss (Qloss) and useful energy (Qu) are 92.23 Watt and 653.83 Watt, respectively, in a Â volume flow rate of 700 ml/min and the total solar radiation of 672.78 W/m2. The useful energy (Qu) increase with reducing the volume flow rate of water. This is due to by reducing the volume flow rate, the heated water will expose longer to absorb the heat from absorber plate.

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.

Karakterisasi Material Polimer PVDF dengan Polarisasi Permukaan Nugraha, Aditya; Ardin, Masri Bin; Rezani, Rivandra
Jurnal Rekayasa Mesin Vol 8, No 3 (2017)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

Polivinylidene fluoride (PVDF) is one type of polymer. PVDF is commonly used as a force, heat and strain sensors due to its piezoelectric properties. However, it needs a special process to create the piezoelectric properties of PDVF. One of the special process to create the piezoelectric properties is surface polarization of PVDF. Two electrodes were placed on the surface of PVDF and a high-voltage DC electricity was used for polarization process. In this study, Piezoresponse Force Microscopy (PFM) and Fourier Transformed Infrared (FTIR) was used to determine the results of the surface polarization. The results showed that PVDF with lateral polarization has a more orderly domain direction and a higher Î² phase compared to unpolarized PVDF. In addition, the quality decreased with increasing the electrode distance in the lateral polarization.

Pengaruh Daya Microwave terhadap Yield pada Ekstraksi Minyak Atsiri dari Bunga Kamboja (Plumeria Alba) menggunakan Metode Microwave Hydrodistillation Erliyanti, Nove Kartika; Rosyidah, Elsa
Jurnal Rekayasa Mesin Vol 8, No 3 (2017)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

Frangipani oil is one of the most expensive essential oils. Conventional extraction methods has many disadvantages, so the microwave hydrodistillation method is used as an alternative to optimize the quality and quantity of frangipani oil. The purpose of this study was to investigate the effect of microwave power on the yield of frangipani oil. The research stage was carried out by inserting frangipani flower that has been cut into the flask and mixed with different aquadest solvent volumes of 300, 400, 500, and 600 ml. The flask put into the microwave with different powers of 300, 450, and 600 W for three hours. The resulting vapor is collected and separated in a separating funnel. The process is carried out at atmospheric pressure and the operating temperature is 100 Â°C. Finally, the yield percentage determined from resulting product. The results showed that microwave power had a significant effect on the yield percentage of frangipani oil. The yield percentage increased with increasing the microwave power. The highest yield percentage was generated at 600 Watt, 25 gram flower mass, and 600 ml volume, which was 1,612%.

Analysis of Temperature Distribution and Rate of Heat Transfer on Cooling System (Simulation) Using Porous Media Su'udy, Ahmad Hamim; Siswanto, Eko; Soenoko, Rudy
Rekayasa Mesin Vol 9, No 1 (2018)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

Science and technology continue to innovate to overcome the problem of cooling systems that often arise from heat generated by the engine and how to improve engine cooling function. The porous media system provides a solution for heat transfer with porous media capable of enhancing heat transfer, as well as the effect of natural convection with porosity variation. The high porosity increases the Prandtl value proportional to the Nusselt value, causing the flow value to increase as well. The study of heat transfer with porous media can be applied to engine cooling system using simulation aid, with porosity 10%, 15%, 20%, 25%, 30%. Where the results obtained porosity affect the temperature distribution where the greater the value of porosity the greater the temperature distribution occurs and the greater the porosity then the value Thermal conductivity is smaller, Small thermal conductivity causes the rate of heat transfer is also small.

Optimasi Frekuensi Kontrol pada Sistem Hybrid Wind-Diesel Menggunakan PID Kontroler Berbasis ACO dan MFA Arrohman, Muhammad; Fajardika, Risky; Muhlasin, Muhlasin; Ali, Machrus
Rekayasa Mesin Vol 9, No 1 (2018)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

The power of the generating system is strongly influenced by frequency changes. The wind generating system is strongly influenced by the magnitude and speed of the agin as input power. The wind-diesel combined generating system is required to obtain optimum power quality. The hybrid swarm system is a controlled network of some renewable energy generation such as: wind turbine, solar cell, micro hydro and so on. Not optimal setting gain and small constant time on Load Frequency Control (LFC), causing its ability to be weak (weak line). In practice, wind-diesel systems are controlled with PID controller. Setting the gain value of the PID is still in the conventional method, making it difficult to get the optimal value. In this research applied control design by using Intelligent Method in finding the optimum value of Proportional Intergral Derivative (PID) to adjust load frequency with Matlab / Simulink program. This research uses Ant Colony Optimization (ACO) and Modification Firefly Algorithm (MFA). For comparison methods are used without control method, conventional PID method and matlab auto tuning method. Wind-diesel modeling uses the transfer function of diagram of wind turbine and diesel. The study compared several uncontrolled methods and conventional PID, ACO, with FA and MFA. The results show that the smallest undershoot is PID-MFA Controller of -1.529.10-4 and the fastest settling time on the PID-ACO controller 11.5 seconds

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Jawa timur

INDONESIA