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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
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Rekayasa Mesin
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 12 Documents
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Search results for , issue "Vol 10, No 2 (2019)" : 12 Documents clear
Pengaruh Temperatur terhadap Laju Reaksi Tar Hasil Pirolisis Serbuk Kayu Mahoni pada Rotary Kiln Nugroho, Andi; Wijayanti, Widya; Sasongko, Mega Nur
Rekayasa Mesin Vol 10, No 2 (2019)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/ub.jrm.2019.010.02.2

Abstract

Pyrolysis is a thermochemical process chemical decomposition of organic substances through the heating process without oxygen. It produced char, tar, and gas. Rotary kiln Pyrolysis is horizontal stove with biomass that being moved in certain rotary along the stove. Biomass particle movement in rotary kiln concentrated at the wall of the kiln in the passive layer. This layer will reach the surface where the layer will move to the bottom of the active layer. This research is an experimental study done with temperature variation 2500 C, 350OC, 450OC,500OC and 600oC, the nitrogen flow rate 3 ml/min and the pyrolysis time is 180 minutes. The equipment that used is built and developed for better result of observation using rotary klin. The rotary kiln will rotate uses an electric motor with velocity 3 rpm. Then a kinetic rate enumeration process is done. The experiment result shows that the temperature is so influential to the tar volume, the higher the temperature, the more tar volume we got. The highest number is at temperature variation 500o C with heating rate 1073 km/hour. The number of tar kinetic rate that produced from enumeration shows that the higher the temperature so the kinetic rate resulted is greater and the analysis result shows that tar volume from the enumeration approximates the actual number of tar volume.
Pengaruh Variasi Diameter Lubang dan Bentuk Profil Elektroda serta Jumlah Pelat Netral terhadap Produksi Brown Gas de Fretes, Henry Valentino; Soeparman, Sudjito; Widhiyanuriyawan, Denny
Rekayasa Mesin Vol 10, No 2 (2019)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/ub.jrm.2019.010.02.7

Abstract

Electrolysis is a process of decomposing water molecules (H2O) into hydrogen (H2) and oxygen (O2) with the help of electrical energy as a trigger for the process. In the electrode process, it takes two electrodes to be placed in water. Electrolysis reaction is a redox reaction, in which the reduction reaction occurs at the cathode forming hydrogen and oxidation occurs at the anode and forms oxygen. The purpose of this study was to determine the effect of variations in the diameter of the electrode hole, the shape of the electrode and the number of neutral plates on the production of Brown Gas by using NaOH as a catalyst. The electrodes used are plain, square, circle and cross shape, and the diameter of the electrode hole is 5 mm, 8 mm, 10 mm and 12 mm. besides that the number of neutral plates varied 4 pieces, 6 pieces, and 8 pieces. NaOH dissolved in water has a percentage of 1.77%. From the results of the study, it is shown that the rate of production increased as the number of neutral plates increased and the power needed by the generator also increased, but the efficiency of the generator was smaller. The diameter of the electrode hole and the shape of the electrode also affect Brown gas production, this is because the electrode cross-sectional area in contact with the electrolyte also has different values. The highest productivity value on cross shape electrode, 10 mm electrode hole diameter and the number of neutral plate 8 pieces, and the lowest in the form of the plain electrode, 5 mm hole diameter and 4 neutral plates. The lowest generator efficiency in the electrode variation is a circular shape, the diameter of the electrode hole is 12 mm and the use of 8 neutral plates and the largest in the square electrode, 12 mm electrode hole diameter and 4 neutral plates.
Evolusi Sistem Bahan Bakar LPG: Tinjauan Literatur Setiyo, Muji; Waluyo, Budi
Rekayasa Mesin Vol 10, No 2 (2019)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/ub.jrm.2019.010.02.12

Abstract

This article presents an analysis of the development of fuel system technology in Liquified Petroleum Gas (LPG) vehicles compared to the development of a fuel system in a gasoline engine. We found that over the past 100 years of using LPG as an alternative fuel, there have been changes in LPG kits for six generations. The first and second-generation LPG kits are similar to the concept of a carburetor, LPG and air mix in front of the throttle valve through a mixer. The third-generation of LPG kits is equivalent to K-Jetronik on a gasoline engine. The fourth and fifth-generation follow the development of a multi-point multi-point injection system and the sixth generation follows the workings of gasoline direct injection (GDI). The sixth-generation of LPG kits, where LPG is injected into the combustion chamber, has an advantage in volumetric efficiency but due to high combustion chamber temperatures, it is necessary to develop injectors that are resistant to high temperatures.
Sintesis Karbon Aktif Berbahan Dasar Mikroalga Chlorella vulgaris Menggunakan Aktivator KOH dan Iradiasi Gelombang Mikro Sukoyo, Agung; Djoyowasito, Gunomo; Wibisono, Yusuf
Jurnal Rekayasa Mesin Vol 10, No 2 (2019)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/ub.jrm.2019.010.02.3

Abstract

Microalgae Chlorella vulgaris has been used as a raw material in the synthesis of powdered activated carbon. Dry microalgae was pyrolyzed at a temperature of 500oC for 30 minutes to obtain microalgae charcoal. The combination of chemical activation treatment using KOH with concentrations of 10, 30, and 50% assisted by microwave irradiation have been used to prepare activated carbon. The properties of activated carbon were analyzed included yield, ash content, volatile substance content, pure activated carbon content, iodine solution absorbency, BET surface area and activated carbon imaging using SEM EDX. The results showed that Chlorella vulgaris microalgae has a carbon element content of 16.09% which has the potential to be used as an activated carbon feedstock. The microalgae activated carbon produced has a range of yield of 27.60-48.64%, ash content 27.98-44.23%, volatile substance content 23.08-30.92%, pure activated carbon content 32.69-41.10%, absorption of iodine solution 189.46 - 260.23 mg/g, surface area BET was obtained at 34,933 m² / g, with a pore average of 46.59 nm in the sample with the highest iodine absorption. Activation using microwave irradiation and higher KOH concentration, i.e. 50%, can reduce the yield and an ash content of activated carbon, on the other hand, increase the level of volatile substances and iodine absorption. SEM EDX imaging results show the formation of micropores on the surface of microalgae activated carbon, however the impurities promotes the deterioration of surface area and lowering the absorption performance of microalgae activated carbon.
Ekstraksi Parameter Statistik Domain Waktu dan Domain Frekuensi untuk Mendeteksi Kavitasi pada Pompa Sentrifugal Berbasis Principal Component Analysis (PCA) Kamiel, Berli Paripurna; Prastomo, Niko; Riyanta, Bambang
Jurnal Rekayasa Mesin Vol 10, No 2 (2019)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/ub.jrm.2019.010.02.8

Abstract

Cavitation phenomenon frequently occurs on the centrifugal pump which may decrease its performance. It may cause a catastrophic failure which leads to a total breakdown of the piping system if the presence of cavitation is not immediately detected and solved. Recently, the popular method used to detect cavitation is based on pattern recognition. The use of pattern recognition technique requires statistical features which are used as input for building the classifier. The extraction of statistical features is usually taken from the vibration signal which consists of time domain and frequency domain. Previous research tends to use the statistical features extracted from the time domain or the frequency domain solely. There is a research gap that can be explored by combining statistical features extracted from both time domain and frequency domain. In this study, Principal Component Analysis (PCA) is used as a feature’s selection and fault classification. PCA linearly transforms statistical features from the original coordinate system into a new coordinate system called principal components (PCs). The first few PCs are a set of selected features which can be used as a classifier. The classifier evaluates and classifies the new set of vibration data then decides whether it falls into normal condition or cavitation category. The vibration signal is taken from the cavitation test-rig under normal condition by opening the valve, level 1 cavitation by opening 75% of valve, level 2 by 50%, and level 3 by 25%. The data is extracted into 7 statistical features from the time domain and 5 from the frequency domain.  Five hundred sets of vibration data are recorded using an accelerometer which was then divided into 400 set for training and 100 set for testing. The study shows that the classifier using statistical features taken from the time domain and frequency domain gives promising results where the clustering effect between normal and cavitation condition is clearly observed.
Pengaruh Hardening dengan Media Quenching Fluida Getah Pohon Pisang terhadap Struktur Mikro dan Komposisi Kimia Baja Karbon Sedang Pangalinan, Antonius; Dimu, Roymons Jimmy
Jurnal Rekayasa Mesin Vol 10, No 2 (2019)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/ub.jrm.2019.010.02.4

Abstract

The purpose of this study was to determine how the chemical composition and microstructure formed in medium carbon steel hardened with banana tree sap fluid compared to oil and water. The process of carbon steel hardening is being heated to the austenite area (850oC ) then held for 10 minutes after which it is cooled quickly (quenching). During the cooling process, it is also measured the cooling rate of the three cooling media. Hardening process material is carried out by microstructure observation using an optical microscope with 400x magnification and also chemical composition testing with SEM-EDX. The results for measuring the cooling rate of banana fluid have a fast cooling rate of 36.9oC/s while water is 16.6oC/s and oil is 7.0oC/s. In observing the microstructure of water it has an unstable micro structure that is still the structure of pearlite, this is because the temperature of the cooling media is too high during quenching. And for oil microstructure and banana fluid get a homogeneous structure, namely martensite and bainite. From the results of testing the chemical composition, it was seen that there was an increase in carbon content in steel after hardening and quenching with the three cooling media. Conclusion The hardening process by quenching oil and banana fluids has a homogeneous micro structure compared to water. Water cooling process has the highest carbon content increase of 1.53 %C from before 0.52 %C.
Sifat Mekanis dan Struktur Mikro pada Sambungan Las Gesek Baja SCM415H untuk Aplikasi Poros Roda Belakang Anggraini, Lydia; Putra, Bobby Salim
Jurnal Rekayasa Mesin Vol 10, No 2 (2019)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/ub.jrm.2019.010.02.9

Abstract

This research aims to evaluate the mechanical properties and microstructure of steel alloy SCM415H processed by friction welding for rear axle shaft application. Friction welding is a process to connect materials without using fillers and has a good quality of joint strength. Two different pressures of friction welding for 2.5 and 6 MPa were applied in this research. In addition, the initial condition of non-welded in SCM415H material was also investigated. In order to evaluate the mechanical properties, several mechanical tests i.e. Vickers hardness, tensile, torque and ultrasonic test were carried out. The result of this research is better welding connection is obtained on the final pressure of 6 MPa. The Vickers hardness is 390 HV was obtained on the welding connection area. Furthermore, the result proved that the higher pressure will affect the higher strength in the welding connection interface. The result of this research is confirmed the welding connection was not easily broken. Therefore, this research has an important role to determine the pressure applied to the friction welding.
Pengaruh Penggunaan Fan dan Debit Fluida terhadap Efisiensi Kerja Atmospheric Water Generator Vidiyanto, Bagus Prabowo; Aryadi, Widya; Khoiron, Ahmad Mustamil; Anis, Samsudin
Rekayasa Mesin Vol 10, No 2 (2019)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/ub.jrm.2019.010.02.1

Abstract

The purposes of this study are to investigate the effect of condenser cooling fan addition and airflow rate on the performance of Atmospheric Water Generator (AWG). In this work, humid air from the environment was supplied into AWG at 15 lpm. Then, it was condensed in the system with and without using a condenser cooling fan. The fan airflow rate also varied from 0.09 m3/s to 0.16 m3/s in order to better assess AWG performance. The results showed that the use of a condenser cooling fan can improve the Coefficient of Performance (COP) and the efficiency of the Atmospheric Water Generator. The average value of COPactual of 2.499 and the highest efficiency of 79.07% was achieved by an Atmosphere Water Generator equipped with a condenser cooling fan at an airflow rate of 0.16 m3/s.
Performansi Alat Penukar Kalor Udara-Tanah (Earth-Air Heat Exchanger) dengan Siklus Terbuka di Kota Medan Manik, Terang U.H.S. Ginting; Sitorus, Tulus Burhanuddin
Rekayasa Mesin Vol 10, No 2 (2019)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/ub.jrm.2019.010.02.6

Abstract

The purpose of this study was to obtain the performance of an EAHE (earth air heat exchanger) with weather conditions in the Medan city. The research method carried out was experimental in the field for several days with varying weather conditions. The air conditioning system using an Air-Earth Heat exchanger has tested its performance by comparing the experimental results with the model of equations that have been developed by the previous researchers. The incoming air velocity 2 m/s is obtained by the output temperature on average for the results experiment with 27.1oC and for theoretical results of 26.5oC with an average air temperature of 32.1oC. As for the incoming air velocity 3 m/s, the resulting output temperature averages for the experimental results of 27.3oC and for theoretical results of 26.9 oC with an average air temperature that is 33.8oC. The higher the air intake velocity, the higher the output temperature in the Air-Earth heat exchanger. At 2 m/s air velocity, the output temperature is 27.1oC and then rises to 27.3oC at air velocity enter 3 m/s. The effectiveness of the earth heat exchanger at the incoming air velocity 2 m/s for the experimental results was 0.84 while the theoretical calculation was 0.97. From the results of multiple regression analysis, it is found that the NTU and inlet air temperature values have a very strong relationship to the COP value. The correlation coefficient is 0.916 at a speed of 2 m/s and 0.959 at a speed of 3 m/s. The results show great potential for the development of ground-air heat exchangers as a passive cooling system building solution.
Pengaruh Diameter dan Kecepatan Kipas Kondensor terhadap Suhu AC Mobil Pribadi, Muh. Agung; Maydiant, Endry; Sukardi, Sukardi
Rekayasa Mesin Vol 10, No 2 (2019)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/ub.jrm.2019.010.02.11

Abstract

The efficiency of the Air Conditioning (AC) system in a car depends on the process of compression, condensation, and evaporation. The new thought that arises is what if the diameter of the condenser fan blade is varied? The objectives of this study are: (1) to test the effect of the diameter of the condenser fan blade on AC temperature, and (2) to test the effect of condenser fan rotation speed on AC temperature. This research is using an experimental method. The results showed: 1) there was an effect of the diameter of the condenser fan on AC temperature, which was 16.7%; and 2) there is an influence of condenser fan rotation speed on AC temperature that is equal to 20.5%. These findings become a reference that to improve the performance of the AC, it can be done by increasing the heat transfer process in the condenser.

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