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All Journal Jurnal Teknik Mesin Rotasi Jurnal Teknologi Jurnal Mechanical Media Mesin: Majalah Teknik Mesin VANOS Journal of Mechanical Engineering Education Journal of Science and Applicative Technology Metal Indonesia JURNAL CRANKSHAFT Infotekmesin STEAM Engineering : Journal of Science, Technology, Education And Mechanical Engineering J-Proteksion: Jurnal Kajian Ilmiah dan Teknologi Teknik Mesin Journal of Metallurgical Engineering and Processing Technology Journal of Mechanical Engineering Journal of Applied Mechanical Technology (JAMET) Jurnal Foundry Journal of Sciencce Technology and Visual Culture
Fajar Paundra
Institut Teknologi Sumatera
Aerospace Engineering Arts Automotive Engineering Chemical Engineering, Chemistry & Bioengineering Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Earth & Planetary Sciences Education Electrical & Electronics Engineering Energy Engineering Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mechanical Engineering

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Effect of Webbing Angle on Tensile and Bending Strengths in Human Hair Fiber Reinforced Composites Paundra, Fajar
ROTASI Vol 24, No 1 (2022): VOLUME 24, NOMOR 1, JANUARI 2022
Publisher : Departemen Teknik Mesin, Fakultas Teknik, Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/rotasi.24.1.30-35

Abstract

Composite is a combination of two or more materials that have different basic properties. This study aims to analyze the effect of woven angle on hair fiber composites on tensile and bending strength. The composite is composed of polyester resin and human hair waste. Hair was soaked in 5% NaOH solution for 1 hour and woven with angle orientation 0°/90°, 15°/105°, 30°/120° and 45°/135°. The process of making composites is made by the Compression Molding method for 24 hours. After making the composite, a density test was carried out with the ASTM C271 standard, tensile test with ASTM D3039 standard and bending test with the ISO 178 standard. The results of the density test obtained an increase in the density value with the lowest density value of 0.82 g/ml and the highest 0.85 g/ ml to produce a lighter composite. Then the tensile test results show the highest tensile strength value of 16.47 MPa which occurs at an angle of 0°/90°. The results of the bending test obtained an increase in bending strength with the highest bending strength value of 47.1 MPa which occurred at an angle of 0°/90°.
The Penetration Depth Of Weld Metal In Underwater Welding With Variations In Water Depth And Water Flow Velocity Fajar Paundra; A. Juan; Triyono Triyono; P. Elmiawan; P. Yunesti
JURNAL MECHANICAL Vol 12, No 1 (2021): Maret 2021
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Lampung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23960/mech.v12.n1.202105

Abstract

Underwater wet welding (UWW) is widely used in the repair of offshore construction and underwater pipelines using the Shielded Metal Arc Welding (SMAW) method. This research was conducted to see the effect of flow (0 m/s, 1 m/s, and 2 m/s) and water depth (2.5 m and 5 m) on the depth weld metal penetration of the SS400 steel underwater welded joints. The control variables used were welding speed of 1.5 mm/s, current of 90 A, electrode E6013 (RB26) with a diameter of 4 mm, type of negative electrode polarity (DC), spraying distance of 10 cm, the direction of spraying in the opposite direction of welding, and fresh water. The results showed that the deeper and fast the flow velocity would decrease the depth of penetration and increases porosity. This is due to the decreased transferability of the molten metal during the welding process.
INVESTIGASI EFEK SOLIDITAS TERHADAP KONTUR TEKANAN SUCTION AREA PADA TURBIN AIR PROPELLER ALIRAN HORISONTAL MENGGUNAKAN COMPUTIONAL FLUID DYNAMIC Fajar Paundra; Akhmad Nurdin; Febri Budi Darsono
Jurnal Teknologi Vol 14, No 1 (2022): Jurnal Teknologi
Publisher : Fakultas Teknik Universitas Muhammadiyah Jakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24853/jurtek.14.1.139-146

Abstract

Internal parameters of the propeller axial turbine affect the performance of the turbine itself. The influence of the internal parameters will provide information on the characteristics of a turbine design and produce optimal performance. Solidity or the ratio of the gaps between turbine blades to the length of the blade chord is one of the internal parameters that affect the performance of the propeller turbine, and visually has similarities to the number of blades parameter. The object of this study is to observe how the solidity of the propeller turbine affects the water pressure contour on the suction side or pressure water before pounding the blade. This study method uses Computational Fluid Dynamic (CFD) with SolidWorks 2016 Flow Simulation software. The variable number of blades used in this study is 3 to 7 blades, with 200 blades each. The results of this study present a plot or a figure with different color contours for each parameter that shows the value of water pressure on the suction and discharge sides, as well as the pressure contour on the surface turbine. This study shows that the higher the solidity value or the more the number of blades, the water pressure in the suction area will increase.
RANCANG BANGUN MESIN LAS TIG SEMI OTOMATIS BERBASIS ARDUINO UNO Muhammad Rizky Hikmatullah; Putty Yunesti; Eko Pujiyulianto; Akhmad Nurdin; Fajar Paundra
Journal of Mechanical Engineering Vol 5, No 1 (2021): Journal of Mechanical Engineering
Publisher : Universitas Tidar

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31002/jom.v5i1.3945

Abstract

ABSTRAKMesin las TIG semi otomatis berbasis Arduino Uno merupakan alat yang dirancang untuk mengontrol parameter kecepatan pengelasan yang sesuai dengan pekerjaan yang akan dilakukan. Proses pembuatan alat ini meliputi perancangan alat dan proses fabrikasi, wiring diagram, dan desain Arduino Uno, serta proses uji coba pengelasan. Pengujian alat pengelasan TIG dilakukan pada plat baja SS400 dengan ukuran 18 × 10 × 3 mm, arus sebesar 80 A, gas pelindung Argon, dan panjang busur las 2 mm, dengan variasi kecepatan pengelasan sebesar 4 mm/detik, 6 mm/detik dan 8 mm/detik. Hasil pengelasan yang paling baik dan sesuai didapatkan pada kecepatan pengelasan 6 mm/detik. Hal tersebut disebabkan karena kecepatan pengelasan dan besar arus yang digunakan sesuai, sehingga minim cacat lasan.Kata kunci: mesin las, TIG, arduino, perancangan alat, kecepatan pengelasan ABSTRACTThe semi-automatic TIG welding machine based on Arduino Uno is a tool designed to control welding speed parameters that match the work to be performed. The process of making this tool includes designing tools and fabrication processes, wiring diagrams and Arduino Uno designs, as well as welding trial processes. The TIG welding tool was tested on a steel plate SS400 with a size of 18 × 10 × 3 mm, a current of 80 A, Argon protective gas, and a welding arc length of 2 mm, with variations in welding speed of 4 mm / second, 6 mm / second and 8 mm / second. The best and most suitable welding results are obtained at a welding speed of 6 mm/second. This is because the welding speed and currently used are suitable so that there are minimal weld defects. Keyword: welding machine, TIG, Arduino, tools design, welding speed
Perancangan Turbin Air Archimedes sebagai Pembangkit Listrik Tenaga Air Melalui Pendekatan Teoritis: Studi di Wisma Inri Karangpandan Kabupaten Karanganyar Akhmad Nurdin Nurdin; Hasan Bisri Bisri; Muhsin Muhsin Muhsin; Fajar Paundra Paundra; Syamsul Hadi Hadi
Journal of Mechanical Engineering Vol 5, No 2 (2021): Journal of Mechanical Engineering
Publisher : Universitas Tidar

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31002/jom.v5i2.5331

Abstract

Wisma Inri terletak di sekitar lereng gunung lawu, di area tersebut terdapat kanal aliran sungai yang dari sumber air sepanjang tahun. Kontur tanah di Wisma Inri yang tidak merata memunculkan perbedaan ketinggian (head) dan berpotensi dimanfaatkan sebagai pembangkit listrik tenaga air dalam skala kecil. Salah satu kanal aliran sungai tersebut berbentuk bidang miring, sehingga turbin air Archimedes merupakan turbin yang sesuai untuk dipalikasikan sebagai alat konversi energi air menjadi energi mekanik. Studi ini bertujuan untuk merancang turbin air Archimedes yang sesuai dengan kondisi bentuk kanal sungai di Wisma Inri. Metode perancangan meliputi pengamatan lokasi untuk menentukan parameter eksternal, selanjutnya dilakukan perhitungan melalui pendekatan matematis dengan variasi jumlahs sudu satu sampai empat buah. Hasil studi ini menunjukkan turbin air Archimedes dengan jumlah sudu satu memiliki nilai paling optimal dibandingkan jumlah sudu dua sampai dengan empat.
Analysis of the Effect of Blade Thickness on Propeller Water Turbine Performance Using Computational Fluid Dynamic Fajar Paundra; Akhmad Nurdin; Hamid Abdillah; Puguh Elmiawan
VANOS Journal of Mechanical Engineering Education Vol 7, No 1 (2022)
Publisher : Universitas Sultan Ageng Tirtayasa

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30870/vanos.v7i1.14979

Abstract

Hydropower on the lowest scale namely propeller pico-hydro, the turbine has a light workload so that allows it to be made from polymer materials with rapid manufacturing 3D printing technology.  In the design of the propeller turbine, the most concerned loading is the axial load which results in failure. A failure of designing the dimensions of the propeller turbine with polymer materials causes a fracture in the blades. This study aims to analyze how the effect of blade thickness on the performance of a propeller water turbine. Data collection in this study uses numerical simulation through computational fluid dynamics using SolidWorks Flow Simulation with the blade thickness variable used 1 mm to 3 mm with a fillet size 1.5 mm. Based on the results, the thickness of the blade affects the value of static torque. At a blade thickness of 2 mm, it shows the most optimal torque value compared to a thickness value below or above 2 mm.
STUDY OF THE POTENTIAL AND DEVELOPMENT OF RENEWABLE ENERGY POWER IN INDONESIA : A REVIEW Fajar Paundra; Akhmad Nurdin
Steam Engineering Vol. 3 No. 2 (2022): STEAM Engineering, Vol. 3, No. 2, Maret 2022
Publisher : Program Studi Pendidikan Teknik Mesin, Fakultas Keguruan dan Ilmu Pendidikan, Universitas Palangka Raya

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (236.396 KB) | DOI: 10.37304/jptm.v3i2.4024

Abstract

Energy consumption in Indonesia every year shows an increasing trend, with energy sources from fossils or non-renewable energy dominating renewable energy in the national energy mix. Climate change due to fossil energy emissions and the depletion of fossil energy reserves directly encourages Indonesia to develop and utilize renewable energy, which is abundantly available in Indonesia. The purpose of this study is to examine the development and planning of the contribution of renewable energy in each sector to the national energy mix in the short to long term. Geothermal capacity total installed in 2019 2130.7 MW with a plan 7.2 GW in 2025 and 17.6 GW in 2050, hydropower total capacity in 2019 6283.3 MW with a paln 21 GW in 2025 and 41 GW in 2050, bioenergy total ini 2019 for power generator 2200 MW with a plan 5.5 GW in 2025 and 26 GW in 2050, in solar energy total capacity in 2020 as power plant 17.22 MW with a plan 6,5 GW in 2025  and 45 GW in 2050, in wind energy until 2020 total capcity for electrical energi 153. 83 MW with a plan 1.8 GW in 2025 and 28 GW in 2050, and the marine energy energy sector in Indonesia has not yet been utilized as an energy harvester. In general, the government targets an increase in the percentage of renewable energy in the national energy mix in the short term until 2025 with a 23% contribution, and in the long term until 2050 with a 31% contribution.
Optimasi Desain Mesin Punch Menggunakan Metode Finite Element Analysis puguh elmiawan; Fajar Paundra; Gigih Tujo Pradibyo
J-Proteksion Vol 6, No 2 (2022): J-Proteksion
Publisher : Universitas Muhammadiyah Jember

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32528/jp.v6i2.6834

Abstract

Pemodelan 3D dan analisa statis dilakukan dengan perangkat lunak Solidworks 2019 menggunakan metode finite element analysis (FEA). Hasil dari analisa statis tersebut, didapatkan yaitu tegangan von mises dengan nilai minimal 0,031 kgf/cm2 dan nilai maksimal 78,630 kgf/cm2, Strain dengan nilai minimal strain yaitu 80,460 pada node 132 dan nilai maksimal strain sebesar 200.989,766 pada node 79, dan Factor of safety dengan nilai maksimal yaitu adalah 200.989,76 FOS dan nilai minimal yaitu 80,460 FOS. Optimasi desain dilakukan untuk mengurangi massa dan dimensi dari rangka mesin punch pelat nomor. Nilai safety factor yang diatur di awal adalah 2, pada proses simulasi didapatkan desain awal adalah 63 FOS dan pada desain akhir sebesar 31 FOS. Massa rangka pada awal desain sebesar 76565 gram dan pada akhir desain sebesar 54695 gram.
KARAKTERISASI PENGARUH SUDUT ANYAMAN KOMPOSIT TERHADAP KEKUATAN TARIK SERAT TANDAN KOSONG KELAPA SAWIT Fajar Paundra; Ahmad Waldi Chaniago; Abdul Muhyi
JURNAL CRANKSHAFT Vol 5, No 2 (2022): Jurnal Crankshaft Vol.5 No.2 (2022)
Publisher : Universitas Muria Kudus

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24176/crankshaft.v5i2.8803

Abstract

Tandan Kosong Kelapa Sawit (TKKS) merupakan limbah yang banyak ditemukan di pulau Sumatra dan berpotensi menjadi penguat dalam sebuah komposit. Pemanfaatan TTKS masih sangat terbatas sehingga perlu dilakukan penelitian lebih lanjut tentang komposit berpenguat serat TKKS. Penelitian ini bertujuan untuk mengetahui pengaruh variasi sudut anyaman terhadap kekuatan tarik komposit berpenguat serat TKKS. Proses pembuatan komposit dengan metode compression molding dengan perbandingan komposisi 60% resin dan 40% serat. Variasi sudut anyaman yang digunakan adalah 0°/90°, 15°/105°, 30°/120°, dan 45°/135°. Pengujian kekuatan tarik dengan standar ASTM 3039 dan dilakukan pengamatan patahannya. Hasil pengujian tarik menunjukkan kekuatan tarik terbesar adalah 12,88 MPa pada sudut anyaman 0°/90°. Hal ini disebabkan semakin banyak serat searah dengan gaya tarik maka semakin tinggi kekuatan tarik yang didapatkan.
Analisis Struktur Mikro dan Kekuatan Aus Rel Kereta Api Tipe R54 Divre IV Tanjung Karang Eko Pujiyulianto; Fajar Paundra; Jukepri Brain Meliala; Hadi Teguh Yudistira; Amelia Oktavia; M. Fahan Sidik; M. Rafi Kurniawan; Fuad Mulkan Al Machzumy
Jurnal Metal Indonesia Vol 44, No 2 (2022): Metal Indonesia
Publisher : Balai Besar Logam dan Mesin

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32423/jmi.2022.v44.67-74

Abstract

Penelitian ini bertujuan untuk menganalisa struktur mikro dan ketahanan aus material rel R54 yang telah digunakan di divre IV tanjung karang. Beberapa pengujian yang dilakukan adalah pengujian komposisi kimia pada bagian kepala dan bagian badan dengan menggunakan spektrometri, pengujian struktur mikro dengan menggunakan mikroskop optik, dan pengujian keausan dengan metode Ogoshi. Hasil penelitian menunjukan bahwa bagian kepala dan bagian badan memiliki komposisi kimia yang sama dimana unsur paduan utamanya adalah C, Si, Mn. Unsur Cr ditemukan pada material R54 yang dianalisis. Hasil pengujian struktur mikro menunjukan bahwa fasa yang terbentuk adalah perlit dimana pada bagian kepala berbentuk perlit halus dan pada bagian badan dan kaki berbentuk perlit kasar. Retakan ditemukan pada permukaan rel. hasil pengujian aus menunjukan bahwa nilai keausan spesifik material rel R54 adalah 1,606 x 10-8 mm2/kg.
Co-Authors A. Juan Abdu Halim Wibowo Abdul Aziz Abdul Muhyi Abdul Muhyi Ahmad Waldi Chaniago Amelia Oktavia Anas Maulana Andi Rahadiyan Wijaya Danang Istanto Devia Gahana Cindi Alfian Dicky J. Silitonga Dimas Aldyansyah Dimas Maulana Aji Duwi Hariyanto Eko Pujiyulianto Eko Pujiyulianto Eko Pujiyulianto Fajar Perdana Nurrullah Febri Budi Darsono Febryan Utama Putra Felderico Andreas Sitanggang Firman Sri Bagaskara Firman Sri Bagaskara Fuad Hakim Fuad Mulkan Al Machzumy Gigih Tujo Pradibyo H.T. Yudhistira Hadi Teguh Yudistira, Hadi Teguh Hamid Abdillah Handoyo Handoyo Hasan Bisri Bisri I Gusti Bagus Budi Dharma Ilham Ramadhan Siregar Ilhan Manzeis Imam Prabowo Imam Prabowo Indriyani Indriyani Jukepri Brain Meliala Kisna Pertiwi Lathifa Putri A Lukman Triawan M. Fahan Sidik M. Muhibbul Khairi M. Rafi Kurniawan Marone J Tambunan Mufidah, Zunanik Muhamad Fatikul Arif Muhammad Ichsanudin Muhammad Rama Aditya Muhammad Rizky Hikmatullah Muhammad Syaukani Muhsin Muhsin Muhsin Nurdin, Akhmad P. Elmiawan P. Yunesti Puguh Elmiawan Puguh Elmiawan Puguh Elmiawan Putty Yunesti Sabar Sastra Kusuma Wijaya Sri Hastuti Syamsul Hadi Hadi Triyono Triyono Zian Millenio