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INDONESIA
AUSTENIT
Published by Politeknik Negeri Sriwijaya
ISSN : 20851286     EISSN : 26227649     DOI : -
Core Subject : Science, Engineering,
Automotive Engineering Control & Systems Engineering Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mechanical Engineering
Jurnal “AUSTENIT” adalah media ilmiah yang dikelola oleh Jurusan Teknik Mesin Politeknik Negeri Sriwijaya, sebagai wadah bagi para penulis artikel ilmiah yang berasal dari kalangan staf edukatif dari berbagai perguruan tinggi maupun masyarakat umum yang memiliki kompetensi di bidang ilmu pengetahuan dan teknologi.
Arjuna Subject : -
Articles 203 Documents
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OPTIMIZATION OF THE REPLACEMENT PROCESS FOR THE BRAKE SHOES ISUZU GIGA TRUCK AT PT AI-ISO DM JAKARTA BRANCH Vuko A T Manurung; Mohammad R. Dwicahyo; Yohanes T. Wibowo; Setyo Haryadi
AUSTENIT Vol. 15 No. 1 (2023): AUSTENIT 15012023
Publisher : Politeknik Negeri Sriwijaya, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5281/zenodo.7935367

Abstract

PT AI-ISO workshop on DM Jakarta provides various repair and periodic maintenance services. In periodic maintenance, brake repair jobs have problems replacing the brake pads (brake shoe set) of Isuzu Giga Trucks, which takes about 9 hours. To reduce the processing time, an improvement process is carried out to shorter processing time, so the customer feels more satisfied with repairing his vehicle. From observations, the length of work time was due to the process of changing the brake pads outside the workshop due to the absence of tools to install the brake pads. The repair shop offers to replace a set of brake pads, but the price is higher than just replacing the brake pads, so the customer makes this choice. The improvement made was the manufacture of a rivet installation tool on the brake pads based on the workings of a rivet machine. First, it is necessary to make a brake pad holder so that it does not shift when pressed and ensures that the pressure acting on the rivet is as requested. This tool is also equipped with a Standard Operation Procedure to make it easier for technicians to replace brake pads. The result is a decrease in processing time for the brake pad replacement process from an average of 9 hours to 5 hours. With these tools, repairing the brake system can be accelerated and within the safe limits required in the vehicle's manual, and the customer will be more satisfied.
THE EFFECT OF DIFFERENT STRUCTURE AND GRADIENT INFILL ON MECHANICAL BEHAVIOR POLYLACTIDE ACID MATERIALS (PLA) imam akbar imam; M Rizky Hidayat Rizky; Dewi Rawani; Rita Maria Veranika; Hariman Al-Faritzie; Romli .
AUSTENIT Vol. 15 No. 1 (2023): AUSTENIT 15012023
Publisher : Politeknik Negeri Sriwijaya, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5281/zenodo.7949586

Abstract

The purpose of this study is to analyze the effect of our gradient infill on the mechanical behavior of polylactide acid (PLA) materials resulting from 3d printing, which has an impact on the efficiency of material use while still providing good mechanical support. In this study, the specimens were designed using nTopology software and there were 4 variations of the structure, namely square, honeycomb, diamond, and gyroid, each of which was made gradient and non-gradient, then a bending test was carried out to determine its mechanical behavior thats PLA materials. The results of this study indicate that a comparison between specimens with gradient and non-gradient models with 50% porosity can increase the deflection of the specimen, namely square 15.7-19.1 mm, honeycomb 16.3-20.6 mm, Diamond 19.7-21.8 mm, and gyroid 20.3-22.1 mm, with an average deflection of 2.04 mm. In addition, there is a linear correlation of the relationship between thickness to deflection and flexural modulus whereas the thickness value increases, the deflection and flexural modulus will increase. The conclusion of this research is that giving a gradient to the structure can improve mechanical behavior, especially deflection.
ANALISA KERUSAKAN PIPA DUCTING SCRUBBING BERBAHAN CARBON STEEL SS400 DI PABRIK PUPUK NPK-1 PT PUSRI PALEMBANG Perez Nasrah; Ozkar F. Homzah
AUSTENIT Vol. 15 No. 1 (2023): AUSTENIT 15012023
Publisher : Politeknik Negeri Sriwijaya, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5281/zenodo.7955419

Abstract

The purpose of this research was to discover the various reasons of failures and appropriate repair options for the line ducting cleaning unit system at PT Pusri Palembang's NPK-1 production facility. The main cause of the failures was determined to be a deterioration of the ducting line material caused by corrosion on the inner side of the ducting pipe composed of SS400 carbon steel. We made investigation including an analysis of the thickness of the damaged ducting pipe, as well as a visual check. The investigation showed that the corrosion caused an average drop in pipe wall thickness of up to 70%. The fixed load superimposed on the ducting pipe and the carrying capacity of the piping affect ducting strength, but corrosion on the inner surface of the pipe, caused by direct contact with corrosive and hygroscopic process dust, reduces ducting wall strength against axial and lateral loads. A Failure pipe caused losses and unscheduled shutdowns of production process, will be increased the repair costs and increases the risk of human accidents. The suggestion of investigation results is to upgrade the ducting pipe materials to knowed corrosion-resistant materials, such as stainless-steel grade SS304. Also, should be taken is also regularly to inspect the ducting cleanness for the internal of ducting and control the dust flow rate through the scrubbing system. As conclusion, the suggestions given are to mitigate the risk of corrosion impact by maintaini­­­­­­ng ducting strength within the minimizing ducting system failures and ensuring the NPK plant's operation reliability.
PENGARUH PERBEDAAN JENIS ELEKTROLIT DAN KONSENTRASI TERHADAP SINTESIS GRAPHENE SECARA ELEKTROKIMIA MENGGUNAKAN REAKTOR SOLENOIDA Isnanda Nuriskasari; Devi Handaya; Adila Syifa Prayogi; In In Mustopa; Tania Sonya Sihombing; Mochammad Tendi Noer Ramadhan
AUSTENIT Vol. 15 No. 1 (2023): AUSTENIT 15012023
Publisher : Politeknik Negeri Sriwijaya, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5281/zenodo.7964430

Abstract

Electrochemical synthesis of graphene is a way to obtain graphene. Graphene as a material that has thermal, magnetic, mechanical, chemical properties, especially in special electrical properties. The development of graphene lies in the method used, one of which is the electrochemical method, where this method has the advantages of being fast, environmentally friendly, and low cost in the production process. In the process, this method requires several main components, namely electrolytes, electrodes, and an electrical supply. The electrolytes used are still very diverse and the search for the right electrolyte continues to increase the production of graphene synthesis. This study focuses on knowing the effect of the Sulfuric Acid (H2SO4), Hydrochloric Acid (HCl), and Vinegar Acid (CH3COOH) as electrolytes in electrochemically obtaining graphene and the effect of electrolyte concentration (0.5M; 1M; and 1.5M). The fixed variable used is commercial graphite with the reactor used is a solenoid modified reactor with a reaction time of 1 hour. The result is that the electrolyte H2SO4 is a very good type of electrolyte in the graphene synthesis process compared to HCl and CH3COOH, it can be seen from a graph containing data in the form of graphite weight after the electrochemical graphene synthesis process, and the greater the concentration, the stronger the electrolyte in the graphene synthesis process, so that more graphite will be eroded and more graphene will be obtained.
Coverage Vol. 15 No. 1 Editorial .
AUSTENIT Vol. 15 No. 1 (2023): AUSTENIT 15012023
Publisher : Politeknik Negeri Sriwijaya, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5281/zenodo.7964720

Abstract

Austenit is a peer-reviewed journal that is regularly published twice times (April and October) a year by Mechanical Engineering Department of Politeknik Negeri Sriwijaya and managed by an experienced editorial board coming from universities in Indonesia and overseas partners. This journal is a highly quality to bridge the results of applied and vocational research in the form of scientific works which have never been published in the other media. The works are in the field of mechanical engineering which includes product design and engineering, energy conversion, metallurgy engineering and sciences, construction, mechanical maintenance and repair, renewable energy and sustainability, and mechanization-control. There are ten articles in this Vol.15 No.1 edition issue written by researchers and Industry expert practitioners from VietNam and Indonesia. The VietNam researchers from Dong Nai Technology University. The Indonesian researchers from Universitas Sriwijaya, Politeknik Astra, Universitas Tridinanti Palembang, Politeknik Negeri Jakarta and Politeknik Negeri Sriwijaya as well Industry Expert from PT. Pusri Palembang. Each article has been selected by the editorial team and passed the single-blind review stage by highly qualified reviewers.
STUDY OF EXHAUST GAS RESIDUAL HEAT CONVERSION HRSG PLTGU KERAMASAN TO ELECTRICAL ENERGY WITH GENERATOR THERMOELECTRIC TECHNOLOGY Hari Hari firmansah; Irwin Bizzy; Agung Mataram; Riman Sipahutar
AUSTENIT Vol. 15 No. 2 (2023): AUSTENIT 15022023
Publisher : Politeknik Negeri Sriwijaya, Indonesia

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Abstract

The Heat Recovery Steam Generator (HRSG) is a combination of a Gas Power Plant (PLTG) and a Steam Power Plant (PLTU), this plant utilizes exhaust gas from the PLTG to produce steam as the working fluid in the PLTU. The residual heat from the heating process at the HRSG is channeled into the chimney, and the remaining heat from the exhaust gas can be converted into electrical energy with the Thermoelectric Generator (TEG) module. This research was carried out by installing the TEG module in series on the surface of the HRSG chimney wall, using laboratory scale measurements. The heat source uses a heater with a total power of 2,000 W. The research results show that the TEG module can convert the residual heat energy of the exhaust gas from the HRSG chimney into electrical energy. Four TEG modules mounted on the chimney surface can generate a voltage of 0.83 V and a maximum power of 2.79 mW. These results indicate that the TEG module is an opportunity to convert heat energy into electrical energy for further development.
DESIGN OF AUTOMATIC BREAD CUTTING MACHINE Made Rahmawaty; rieke yolanda; Hendriko Hendriko
AUSTENIT Vol. 15 No. 2 (2023): AUSTENIT 15022023
Publisher : Politeknik Negeri Sriwijaya, Indonesia

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Abstract

Before being marketed, white bread will usually be cut first. Small to medium scale bread entrepreneurs still use conventional tools in the form of standard bread knives, whose use is still less effective. This bread cutting machine is designed for small to medium sized bakers to make their work easier and more efficient. This machine is designed using a vertical blade movement method with an AC motor as the driving force and is controlled using a sequential circuit. The initial process of this machine is to press the pushbutton, then place the bread on the bread tray which has a proximity sensor as a bread detector and the cutting process is carried out, when the sensor does not detect the presence of bread the machine will stop working automatically. Electronic system control is carried out sequentially which is more efficient in its application. From the test results obtained that the thickness of the bread is 12 mm. The main driver of the cutting is 1 phase and uses a dimer to adjust the rotational speed of the 1 phase motor. The cutting process with a maximum motor speed can cut 1 loaf for 38 seconds.
DEVELOPMENT OF UNDERWATER ROV (REMOTELY OPERATED VEHICLE) SYSTEMS AND MECHANISM Tianur Tianur; Bagas Prayoga Suswanto Suswanto; Hendriko Hendriko; Made Rahmawaty
AUSTENIT Vol. 15 No. 2 (2023): AUSTENIT 15022023
Publisher : Politeknik Negeri Sriwijaya, Indonesia

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Abstract

  Remotely Operated Vehicle or abbreviated as ROV is an underwater explorer robot where the robot is controlled remotely by an operator using a remote control system.  Water ecosystems certainly have various kinds of hazards that cause harm to divers, such as wild animals, waters contaminated with toxic waste, limited oxygen, and many other risks. Based on these problems, research was carried out, namely the Design and Development of Underwater ROV (Remotely Operated Vehicle) Mechanisms and Systems where the tool built is an underwater robot that uses 8 DC motors to be able to perform 12 types of movements under water. The final result obtained by the ROV is that it is able to perform all of these movements except for the right somersault and left somersault. The speed and direction of rotation of the motor is controlled by a device, namely the BTS7960 motor driver. This robot aims to measure pressure and temperature and capture images underwater to a depth of 4m. Pressure and temperature measurements were made using a BMP180 pressure sensor and a DS18B20 temperature sensor where the measurement results will be displayed on a 16x2 LCD. Based on the test results, the pressure sensor has an error rate of 3.6% and a temperature sensor of 0.34%. Images and videos are captured by a device, namely a CCTV camera where the device is connected to a laptop device as a monitor. The test produced results in the form of images and videos that were quite clear.
THE The boiler is equipment widely used in various industrial sectors such as power plants, fertilizer plants, paper mills, and others. The combustion chamber is an important part of the boiler which can determine the quality of the steam product. The main problem has happened in combustion chambers such as unburned hydrocarbon/carbon loss which is called fouling. Fouling has occurred in many boilers, which use coal or oil as fuel for the production of steam and decreases boiler performance. The Iriani Reka Septiana; Rima Daniar; Dilia Puspa; Nurul Nurul Kholidah
AUSTENIT Vol. 15 No. 2 (2023): AUSTENIT 15022023
Publisher : Politeknik Negeri Sriwijaya, Indonesia

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Abstract

The boiler is equipment widely used in various industrial sectors such as power plants, fertilizer plants, paper mills, and others. The combustion chamber is an important part of the boiler which can determine the quality of the steam product. The main problem has happened in combustion chambers such as unburned hydrocarbon/carbon loss which is called fouling. Fouling has occurred in many boilers, which use coal or oil as fuel for the production of steam and decreases boiler performance. The purpose of this research is to increase temperature by adding steam injection to reduce fouling to compare with and without steam injection. Two indicators that have the potential to enhance heat transfer are the elevation in temperature and the reduction in fouling percentage. The variables in this research were air flow of 15 L/min, 17,5 L/min, and 20 L/min and steam injection pressure of 2 bars, 3 bars, and 4 bars. The maximum temperature enhancement was 37,5% in 15 L/min of air flow at a steam injection pressure of 2 bars and 3 bars. The maximum fouling abatement was 78,57% in 15 L/min at a steam injection pressure of 4 bars.
INVESTIGATION OF THE EFFECT OF WINDOW SHADES TYPE ON THE OTTV IN U COLLEGE BUILDING OF BANDUNG STATE POLYTECHNIC Muhammad Akmal; Annisa Syafitri Kurniasetiawati
AUSTENIT Vol. 15 No. 2 (2023): AUSTENIT 15022023
Publisher : Politeknik Negeri Sriwijaya, Indonesia

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Abstract

The U building is the college building for the Department of Refrigeration and Air Conditioning, Bandung State Polytechnic. However, during the afternoon teaching, the third floor is often complained of feeling hot and disrupting the teaching and learning process. This is caused by the size of the window on the third floor is too large and does not use any shade. This research was conducted to determine the OTTV value of the existing U Building and then investigate the potential for improving the OTTV value by changing window glass materials or adding shading such as window film. This study used primary and secondary data collection methods. The primary data consisted of: building dimensions, glass dimensions, door dimensions, ambient temperature, inside temperature, wall and glass surface temperatures, and glass types. Meanwhile, some secondary data, namely building U as built drawings, wall specifications, and glass specifications used. It was found that the existing OTTV value of the Lecture U Building reached 39.78 W/m2 where this value was above the SNI 03-6389 2011 standard. By investigating the installation of shading such as window film and double glass it was possible to minimize the building's OTTV value to 36.78 W/m2 for window film and 33.86 W/m2 for the addition of double glass accompanied by window film.

Page 20 of 21 | Total Record : 203

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