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All Journal Jurnal Energi Dan Manufaktur Jurnal Teknik Mesin Jurnal Teknik Mesin Jurnal Teknologi dan Vokasi Jurnal Ilmiah Teknik Mesin, Elektro dan Komputer
Rozi Saferi
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Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Electrical & Electronics Engineering Energy Engineering Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mechanical Engineering

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Pengaruh Thermal Shock Terhadap Kekuatan Tarik dan Bending KompositResinBerpenguat Serat Rami Rozi Saferi; Hendery Dahlan; Mulyadi Bur Mulyadi Bur
Jurnal Energi Dan Manufaktur Vol 8 No 2 (2015): Oktober 2015
Publisher : Department of Mechanical Engineering, University of Udayana

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (780.674 KB)

Abstract

Abstrak:Perkembanganteknologi komposit saat ini sudah mulai mengalami pergeseran, dari bahan komposit berpenguat serat sintesismenjadi bahan komposit berpenguat serat alam. Serat alam rami (Boehmeria Nivea) memiliki peluang untukdikembangkan sebagai media penguatan pada resin polimer. Tujuan dari penelitian ini untuk mengetahui perubahan kekuatan tarik dan bending kompositresinberpenguat serat ramiakibat pengaruh lingkungan. Dalam penelitian ini digunakan serat ramipintalan dengan diameter 1.5 mm yang ditenun manual dan matriks polyester jenis resin bening.. Fraksi volume serat dan resin yang digunakan9% dan 91%.Tenunan serat divariasikan baik dengan perlakuan NaOH 20% maupun tanpa perlakuan alkali. Komposit dipanaskan di dalam oven listrik pada temperatur 1000C selama 1 jam, kemudian dilakukan pendinginan dengan merendam komposit pada ????????2???????? dengan variasi siklus thermal shock 5, 10, 15, dan 20. Spesimen uji tarik dan uji bending dibuat berdasarkan ASTM D638 dan ASTM D790-03.Hasil penelitian menunjukkan Kekuatan tarik dari komposit resin berpenguat serat rami dengan perlakuan NaOH 20% rata-rata turun 25,66 % dari kekuatan tarik maksimum sebesar 38.4 MPa dan turun 24.51% dari kekuatan tarik maksimum sebesar 29.08 MPa untuk serat tanpa perlakuan NaOH akibat perlakuan thermal shock. Kekuatan bending dari komposit resin berpenguat serat rami dengan perlakuan NaOH mengalami penurunan rata-rata 14.14 % dari kekuatan bending maksimum sebesar 75.08 MPa dan mengalami penurunan 17.34% dari kekuatan bending maksimum sebesar 49.57 MPa untuk serat tanpa perlakuan NaOH akibat pengaruh thermal shock.Bentuk patahan spesimen komposit setelah diberikan perlakuan thermal shock menunjukkan semakin getasnya stuktur dari komposit dan semakin rapuhnya serat rami baik dengan maupun tanpa perlakuan NaOH Kata Kunci: Komposit, rami, thermal shock, sifat mekanik.Abstract:The recent composite technology has changed from synthetic to natural fibre-reinforced composite. Natural fibre Boehmeria Nivea (rami) is one of the promising reinforced medium to polymer resin. The objective of the present work is to investigate the tensile and bending strengths of the boehmeria nivea fibre-reinforced resin composite. The present research used a 1.5 mm diameter of woven boehmeria nivea fibre and a transparent resin of polyester matrix. The volume fraction of the fibre and resin were 9% and 91%, respectively. The woven fibre was varied with 20% NaOH and without alkali treatment. The composite was heated in electrical oven at 1000 oC during 1 hour, and then cooled by immersing the composite in the water at various cycle of thermal shock 5, 10, 15, and 20, respectively. The specimen for tensile and bending test was made according to ASTM D638 and ASTM D790-03. The results showed that the tensile strength of the boehmeria nivea fibre-reinforced composite with NaOH 20% treatment decreased 25,66% by average from the maximum tensile strength 38.4 MPa. Meanwhile the tensile strength that of without NaOH treatment decreased 24,51% from the maximum tensile strength 75,08 MPa. Those of bending strength of the tested composite also decreased 14,14% from the maximum value 75,08 MPa; and decreased 17,34% from the maximum bending strength 49,57 MPa, respectively. The fracture shape of the specimen showed both the brittle structure of the composite and the fragile fibre on both with and without treatment. KeyWords: Composite, rami, thermal shock, mechanical properties
Toughness and Fracture Surface of Frame of Drone Based on Composite from Waste Materials Mastariyanto Perdana; Rozi Saferi; Putri Pratiwi
Jurnal Teknik Mesin (JTM) Vol 9, No 2 (2019)
Publisher : LP2M - Institut Teknologi Padang

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Abstract

Application of green composites material is aerial egineering. Advantages of green composites material are lightweight and relatively strong. This reason that makes green composites can be applied in Unmanned Aerial Vehicle (UAV). In this study, material of quadcopter frame was composites material that made of waste material from styrofoam, bagasse and eggshell. Styrofoam was used as binder of composite material. Bagasse and eggshell was used as reinforcement in green composite material. The investigation focused on effect of volume fraction on flying time of quadcopter that made of green composites material. This study showed that addition of eggshell powder in composites up 25% by volume fraction, result in decreasing the flying time of quadcopter. Addition of eggshell powder in composites up 25% by volume fraction,  result in decreasing the porous of green composite. Porous structure affect the flying time of quadcopter based on green composite materials that made of waste material from styrofoam, bagasse and eggshell. Green composite based on styrofoam, bagasse and eggshell can be applied in Unmanned Aerial Vehicle (UAV) materials.
Design Development of Rice Transplanter with Quality Function Deployment Method Rozi Saferi; Asmara Yanto; Anton Bintarnel
Jurnal Teknik Mesin Vol 12 No 1 (2022): Jurnal Teknik Mesin Vol.12 No.1 April 2022
Publisher : Lembaga Penelitian dan Pengabdian Masyarakat (LP2M) - ITP

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21063/jtm.2022.v12.i1.51-60

Abstract

Today's agricultural development is inseparable from the development of agricultural tools and machinery technology. The application of this technology can be in the form of mechanization technology for rice cultivation using a rice transplanter. With the technology that helps them, it is hoped that agricultural productivity in Indonesia will increase from year to year and the farmers who are generally elderly can work more easily in managing their fields. The purpose of this study is to identify and determine the level of consumer needs related to rice transplanter, determine the technical characteristics of rice transplanter based on consumer preferences, and develop a House of Quality (HOQ) to determine the dominant design requirements and the priority technical characteristics of the equipment. Based on the House of Quality (HoQ) diagram, the best priority in improving the quality of products for making rice transplanter is an easy-to-use tool with a value of 138 with an average of 4.60. On the other hand, farmers also need a tool that can speed up rice planting on the condition that it is easy to use, because the suitability and convenience of rice farmers is a top priority. Furthermore, the design of the tool with a price that is not too expensive has a weight of 136 with an average of 4.53. This also shows that the price component is a priority for farmers to choose a rice transplanter.
Failure Analysis of Induced Draft Fan Bearing in PT Semen Padang Using The RCM Method Rozi Saferi; Sulaeman; Olka Defra Wanda
Jurnal Teknik Mesin Vol 13 No 1 (2023): Jurnal Teknik Mesin Vol.13 No.1 April 2023
Publisher : Lembaga Penelitian dan Pengabdian Masyarakat (LP2M) - ITP

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21063/jtm.2023.v13.i1.19-26

Abstract

The development of the technology is getting trigger competition in industri. To compete, companies should can provide products and the quality of services best for consumer. This study aims to find out the causes of bearings that are damaged in the Induced Draft Fan (IDF Bearing) and how to plan strategic maintenance of IDF Bearing. The method used is reliability centered maintenance (RCM). The causes of bearing damage are analyzed using the Failure Mode Effect and Critical Analysis (FMECA) method. The results of this study show that the cause of IDF Bearing damage is clearance with an RPN value of 210, lubrication system with an RPN value of 36, unbalance with an RPN value of 72, and high temperature with an RPN value of 54. Scheduled Restoration Maintenance is applied for IDF Bearing , where task or preventive maintenance in the form of oil change with a time of 5803.2 hours or 241 days.
Stress Analysis of Elevator Chain Pin in PT. Semen Padang Rozi Saferi; Karnova Yanel; Hamdani Akmal
Jurnal Teknik Mesin Vol 13 No 2 (2023): Jurnal Teknik Mesin Vol.13 No.2 October 2023
Publisher : Lembaga Penelitian dan Pengabdian Masyarakat (LP2M) - ITP

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21063/jtm.2023.v13.i2.42-48

Abstract

The chain pin on the elevator chain is the most important component in the chain in transmission system which function as an axle on the chain. Chain pin is the part that is in direct contact with the sprocket teeth. This analysis aims to determine the stress that occurs in the chain pin by calculating the stress and using the autodesk inventor software. Data collection is done by measuring the dimensions of the elevator chain, the calculating the chain pin analysis using equation according to theory and using autodesk inventor for better analysis result. The result of the stress analysis on the chain pin with a diameter of 23 mm are 16.93 MPa while the result of the analysis using autodesk inventor software are 1.43 MPa. So that the stress resulting from the two analysis does not exceed the maximum allowable stress of 568.78 MPa.
PROTOTYPE SOLAR TRACKER BERBASIS ARDUINO Yanel, Karnova; Rozi Saferi
Jurnal Ilmiah Teknik Mesin, Elektro dan Komputer Vol. 3 No. 2 (2023): Juli: Jurnal Ilmiah Teknik Mesin, Elektro dan Komputer
Publisher : Lembaga Pengembangan Kinerja Dosen

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.51903/juritek.v3i2.1897

Abstract

Solar radiation is the light – also known as electromagnetic radiation – that is emitted by the sun. The enormous amount of energy generated from sunlight makes solar cells a very promising alternative energy source for the future. Solar cells also have the advantage of being a practical energy source considering they do not require transmission because they can be installed in a modular manner at any location where they are needed. Various technologies have been developed in the process of making solar cells to reduce production costs to make them more economical. The aim of this research has been achieved, namely to design an Arduino-based solar tracking system, so that by using a solar tracker solar energy can be absorbed and produced more optimally than without using a solar tracker. This is proven based on the results of the Black box test. As for the results of testing the system in a black box, the result is that solar panels can move to follow the sunlight and produce maximum energy. So that this tool can be applied to all regions and can assist the government in efforts to overcome energy problems, especially optimizing alternative energy.
ANALISIS KEGAGALAN GEARBOX KOMPRESOR ATLAS COPCO GA 90+ MENGGUNAKAN FAILURE MODE AND EFFECT ANALYSIS DI PACKING PLANT PT SEMEN PADANG Karnova Yanel; Rozi Saferi
Jurnal Teknologi dan Vokasi Vol 4 No 2 (2026): Jurnal Teknologi dan Vokasi
Publisher : ITP Press

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21063/jtv.2023.1.1.17-27

Abstract

Kegagalan gearbox pada kompresor Atlas Copco GA 90+ di sistem unloading semen menyebabkan penghentian operasi dan meningkatkan risiko kehilangan produksi. Penelitian ini bertujuan mengidentifikasi mode kegagalan dominan, menentukan prioritas risikonya, dan merumuskan tindakan mitigasi menggunakan Failure Mode and Effect Analysis (FMEA). Penelitian menggunakan studi kasus deskriptif pada satu unit gearbox yang gagal di Packing Plant PT Semen Padang. Data diperoleh melalui observasi pembongkaran, pemeriksaan visual komponen, dokumen pemeliharaan, pengamatan kondisi oli, serta kuesioner penilaian severity, occurrence, dan detection kepada delapan teknisi. Empat mode kegagalan teridentifikasi, yaitu tooth fracture, surface pitting, kontaminasi logam pada oli, dan kerusakan permukaan housing. Surface pitting memiliki Risk Priority Number (RPN) tertinggi sebesar 288,75, diikuti tooth fracture 287,28, kontaminasi logam 181,90, dan kerusakan permukaan 82,62. Kedekatan RPN dua mode utama menunjukkan bahwa kelelahan kontak permukaan dan fraktur lentur gigi harus ditangani secara bersamaan. Bukti visual memperlihatkan patahan gigi, pitting, dan serpihan logam dalam oli. Akar penyebab yang paling mungkin adalah kombinasi ketidakselarasan poros, beban kejut saat unloading, degradasi pelumas, interval penggantian oli yang tidak memadai, dan lemahnya deteksi dini. Rekomendasi utama meliputi pemantauan getaran, laser alignment berkala, penggantian oli setiap 2.000 jam disertai magnetic plug dan filtrasi yang lebih baik, optimasi urutan unloading, serta penggunaan gear dengan ketahanan fatigue yang lebih tinggi. Hasil penelitian memberikan dasar prioritas preventive dan predictive maintenance, tetapi verifikasi lanjutan melalui analisis getaran, pengujian oli laboratorium, dan fraktografi mikroskopis tetap diperlukan.
Co-Authors Anton Bintarnel Asmara Yanto Asmara Yanto Hamdani Akmal Hendery Dahlan, Hendery Ismet Eka Putra Karnova Yanel Karnova Yanel Mastariyanto Perdana Mulyadi Bur Olka Defra Wanda Putri Pratiwi Sulaeman Yanel, Karnova