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Budi Arifvianto
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Departmen Teknik Mesin dan Industri, Fakultas Teknik, Universitas Gadjah Mada Jl. Grafika No. 2, Yogyakarta 55281, Indonesia
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Journal of Mechanical Design and Testing (JMDT)
Published by Universitas Gadjah Mada
ISSN : 27161293     EISSN : 26858029     DOI : 10.22146
Core Subject : Engineering,
Engineering Industrial & Manufacturing Engineering Mechanical Engineering
Design of mechanical components used in engineering structures, machines and engines, computer aided design (CAD), computer aided manufacturing (CAM), the development of methodology for designing machine elements or mechanical components. Finite element analysis, computational fluid dynamics, computational heat and mass transfer, applied mechanics, biomechanics. Manufacturing technologies, materials processing technologies, conventional and non-conventional machining, powder metallurgy, casting, welding, additive manufacturing and rapid prototyping, automation. Evaluation of engine performance, tribology and lubrication, engine maintenance, testing of mechanical components, materials characterizations, failure analysis. Experimental fluid dynamics, multiphase flow, heat and mass transfer, pump and compressor. Energy conversion, turbo machineries, internal combustion engines, power plant. Mechanical engineering education, learning method for mechanical engineering education, engineering ethics.
Arjuna Subject : Teknik (semua kategori) - Teknik Mesin
Articles 58 Documents
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Analisis Kegagalan Pelat Roller Coal Crusher Pada Circulating Fluidized Bed Boiler di PLTU Batu Bara Faris Fadhil Utomo; Mochammad Noer Ilman
Journal of Mechanical Design and Testing Vol 4, No 2 (2022): Article in Press
Publisher : Departemen Teknik Mesin dan Industri, Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/jmdt.72323

Abstract

Salah satu alat yang digunakan untuk mengolah batu bara sebelum dimasukkan dan dibakar di dalam ruang bakar boiler pada Pembangkit Listrik Tenaga Uap (PLTU) batu bara dengan circulating fluidized bed (CFB) boiler adalah coal crusher. Salah satu masalah yang timbul pada alat tersebut adalah keausan pada gigi-gigi pelat yang bisa berdampak pada penurunan efisiensi pembakaran di boiler. Untuk mengatasi masalah ini, diperlukan repair weld untuk meningkatkan kekerasan permukaan (hardfacing) dengan menggunakan shielded metal arc welding (SMAW). Penelitian ini bertujuan mempelajari karakteristik material Hadfield steel yang digunakan sebagai pelat roller coal crusher di suatu PLTU batu bara CFB boiler pada kondisi sebelum perlakuan (as received) dan sesudah mengalami hardfacing (repair weld) menggunakan proses SMAW. Pada penelitian ini, perlakuan hardfacing dilakukan dengan menggunakan 3 jenis elektroda las SMAW, yaitu: AWS A5.4 E309-16, AWS A5.13 EFeMn-A, dan CHR 212, masing-masing untuk lapisan dasar, lapisan tengah dan permukaan atas dari gigi pelat. Selanjutnya dilakukan pengujian yang meliputi: uji komposisi kimia material, pengamatan struktur mikro, uji kekerasan mikro Vickers, uji tarik, uji impak, uji keausan, dan fraktografi. Hasil penelitian menunjukkan bahwa pelat as received  dengan struktur mikro berupa austenite cenderung rentan terhadap keausan (impact wear) pada gigi pelat saat dioperasikan karena kekerasan relatif rendah, yaitu sekitar 216 HV. Untuk pelat repair weld, struktur mikro berupa austenite pada lapisan AWS A5.4 E309-16 dan AWS A5.13 EFeMn-A dengan bentuk columnar dendritic sedangkan pada bagian permukaan gigi pelat yang dibuat dari elektroda CHR 212 berupa martensite dan austenite. Adanya struktur mikro berupa martensite pada permukaan gigi hasil dari repair welding ini menyebabkan peningkatan nilai kekerasan (700 HV) dan nilai ketahanan aus namun diikuti dengan penurunan ketangguhan impak dan kekuatan tarik akibat terjadinya retak las yang berupa retak pembekuan (weld solidification cracking) dan hydrogen-induced crack.
Studi Eksperimental Pola Aliran Dua Fasa dan Karakteristik Slug pada Saluran Horizontal Microchannel Penampang Persegi M. Rian Alif Madani; Haslinda Kusumaningsih; Deendarlianto Deendarlianto
Journal of Mechanical Design and Testing Vol 4, No 2 (2022): Article in Press
Publisher : Departemen Teknik Mesin dan Industri, Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/jmdt.78968

Abstract

Pada peradaban saat ini, telah terjadi peningkatan yang signifikan dalam perkembangan dan penerapan teknologi saluran microchannel dikarenakan keunggulan serta manfaatnya. Salah satu aplikasinya adalah liquid cooling system yang terdapat pada CPU atau GPU komputer dan sistem pendingin reaktor mikro. Seiring berjalannya perkembangan teknologi, kebutuhan sistem pendingin pada ukuran yang lebih kecil seperti pada telepon genggam, tablet, dan laptop menjadi tantangan tersendiri. Studi eksperimental aliran dua fasa pada saluran microchannel dilakukan terhadap karakteristik pola aliran untuk fluida newtonian dan perbandingannya secara spesifik dengan fluida non-newtonian untuk karakteristik pola aliran yang terbentuk. Saluran micro-fluidic chip berpenampang persegi dengan ukuran 0,8 mm x 0,8 mm dilewati oleh fluida kerja cairan newtonian berupa Air dan non-newtonian berupa Carboxymethyl Cellulose (CMC) konsentrasi 0,2% serta 0,4% dengan nitrogen sebagai fluida kerja gas. Kecepatan superfisial cairan yang digunakan adalah pada rentang JL= 0,05 – 1 m/s dan gas JG = 0,07 − 8,594 m/s. Differential pressure transducer dan high speed camera digunakan untuk menganalisis fenomena yang terjadi. Metode image processing digunakan dengan aplikasi MATLAB R2021a. Pola aliran yang teridentifikasi adalah bubbly, slug, slug-churn, churn, wavy-annular, dan slug-annular. Karakteristik slug seperti geometri dan waktu pembentukan dianalisa dengan membandingkan fluida kerja Air, CMC 0,2%, dan CMC 0,4% serta pengaruh variasi JG dan JL.
Analisis Sisa Umur Pakai Tube Heater Pada Heat Recovery Steam Generator (HRSG) Danan Wahyudi; Priyo Tri Iswanto
Journal of Mechanical Design and Testing Vol 5, No 1 (2023): Article in Press
Publisher : Departemen Teknik Mesin dan Industri, Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/jmdt.70178

Abstract

Penelitian ini bertujuan untuk mengetahui sisa umur pakai material pipa baja karbon SA 106 C yang digunakan sebagai tube heater pada heat recovery steam generator (HRSG) setelah dilakukan major overhaul. Metode yang digunakan dalam penelitian adalah menganalisis stress rupture test sejumlah spesimen yang kemudian diplot pada kurva Larson-Miller parameter (PLM) dan dilakukan ektrapolasi. Dalam ploting kurva PLM menggunakan 2 nilai konstanta yaitu 20 (ASM Handbook, 2000) dan 15,6 (API STANDARD 530, 2015). Hasil analisis didapatkan sisa umur pakai pada tekanan dan temperatur desain menggunkan metode PLM dengan nilai konstanta 20 dan 15,6 adalah 3.253 jam dan 1.425 jam. Perhitungan sisa umur pakai menggunakan metode PLM dengan nilai konstanta berdasarkan API 530 lebih konservatif.
Mechanical Properties and Corrosion Characteristics of Dissimilar Friction Stir Welded AA1000/AA6061-T6 Aluminum Alloys Chhorn Sokvisal; Mochammad Noer Ilman
Journal of Mechanical Design and Testing Vol 5, No 1 (2023): Article in Press
Publisher : Departemen Teknik Mesin dan Industri, Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/jmdt.74006

Abstract

This paper is aimed to investigate microstructure, corrosion and mechanical properties of dissimilar metal weld joints between AA1000 and AA6061-T6 under different tool rotational speeds of 910, 1500, and 2280 rpm at a constant transverse speed of 30 mm/min. Several experimental works have been conducted including microstructure observation using optical microscopy and Scanning Electron Microscopy (SEM) equipped with Energy Dispersive X-ray Spectroscopy (EDS), Vickers microhardness measurements, tensile tests, and corrosion measurements using Potentiodynamic Polarization method. Results show that increasing tool rotational speed from 910 rpm to 1500 rpm increases the degree of homogeneity in nugget zone and improves strength of the weld joint but further increase in the tool rotational speed up to 2280 rpm degrades the mechanical properties due to coarsening of the microstructure. Furthermore, corrosion rate of the nugget zone (NZ) is in between the two base metals.
Operational Excellence of Hydro Power Plant With “G-Action Mobile” Arry Erawan; Wahyu Kurnia; Muhammad Nur Muharramsyahputra
Journal of Mechanical Design and Testing Vol 5, No 1 (2023): Article in Press
Publisher : Departemen Teknik Mesin dan Industri, Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/jmdt.85642

Abstract

The Gunung Wugul Mini Hydro Electric Power Plant (MHEPP) is a run of river power plant with a Commercial Operation Date (COD) of December 3, 2021, by PT PLN UP2D Central Java-Special Region of Yogyakarta. The application of corporate culture and regulations to run the operations of the Generating Unit such as asset management, Occupational Health and Safety Management System (SMK3) and Security Management System (SMP) require a high level of effort. Socialization and implementation related to the management of the Generating Unit must be carried out to the lowest level for the realization of good management. Focusing on Operational Excellence built on Shingo House Method, where elements of organizational leadership focus on the application of principles, systems, and tools to build superior performance factors by making continuous improvements. The implementation of G-Action Mobile optimizes digital technology and supports the company's program, namely digital transformation for control operations, maintenance, security, and Occupational Health and Safety (OHS) activities more effectively. The G-Action Mobile application can encourage the acceleration of the implementation of corporate culture within the Gunung Wugul MHEPP so that the achievement of a capability factor of 67.16% of the 33.60% target, the issuance of a Zero Accident decree, and the implementation of a security management system that is tight enough to support environmental conditions that can improve unit performance with conditions comfortable and safe.
Motor Control Center Breaker Modification Through On/Off Switch to Prevent Motor Failure Ahmad Rosyiddin; Imam Maulana Arief; Novarino Herdyan Minanta
Journal of Mechanical Design and Testing Vol 5, No 1 (2023): Article in Press
Publisher : Departemen Teknik Mesin dan Industri, Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/jmdt.85643

Abstract

Motor Control Center (MCC) GT module, is a power breaker device that connects the voltage source to the load. MCC breaker rack-in and rack-out activities can be classified as unsafe action and unsade condition.  Because there is a possibility of explosion. As it had happened several times in several places in the world. In 2021 there were 3 force derating and force outages which are caused by MCC motor breaker failures. That accident resulted 500,516.67 KWh loss or Rp 682,262,223,- ($ 44,766). Therefore, modifications need to be made to 0.4kV MCC breaker by adding a selector for the order off blocker to minimize socket damage due to frequent rack-in-rack-out breakers activity. After installing the modification to all breakers in Priok POMU, there was no failures occurred. The frequency of rack-in-rack-out activities were reduced significantly and that is a good result for operation safety. This modification can also prevent Priok POMU from a potential loss and potentially increase net profit up to Rp 221,549,398,- ($ 14,537).
Modification of The Oil Cooler to Avoid Oil Leaking in Generator Transformer PLTU Labuan “Moderator” Prima Galih Pratama; Setyawan Santoso; Shandy Helmi Ramadhan
Journal of Mechanical Design and Testing Vol 5, No 1 (2023): Article in Press
Publisher : Departemen Teknik Mesin dan Industri, Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/jmdt.85644

Abstract

The Main Generator Transformer for PLTU Labuan is a transformer with a power capacity of 350 MVA and a cooling system of 6 pcs OFAF (Oil Force Air Force) type. During operation, a disturbance to the Main Generator Transformer (GT) was caused by an oil cooler leak. This is caused by the corrosive expand tube caused by the constituent material consisting of 2 different types of materials. The oil leak caused environmental pollution, decreased oil level, and increased winding temperature and oil temperature on GT. During the decade of operation of the PLTU Labuan, GT oil cooler leaks almost always occur every year, both in unit 1 and unit 2. To anticipate this, we made modifications to the end tube design by changing the type of material on the expanded tube from initially using iron to aluminum such as tube material outside the expanded position. The next design change is to increase the length of the end tube which is equipped with the knock and glue with an expansion strength above normal operating temperature which makes the end tube more reliable by increasing the surface area attached to the body oil cooler. In addition to making changes to the design, this modification reuses used oil coolers that have good tube quality so that they can be reused with more reliable quality. By making these modifications, it can increase the readiness of generating unit production (EAF) by 3.33% in one MO event due to the replacement of the oil cooler generator transformer and lower maintenance costs for the required transformer oil cooler. The modified Oil Cooler was installed during the Maintenance Outage in Unit 1 and Overhaul unit 2 in 2021 and is still operating well for 20 months of operation.
Recognition of Safety Helmet Wearing Of Operator Local Ground Floor Unit 2 Suralaya PGU Based On Improved YOLOv3 Firlan Maulana Ruaz
Journal of Mechanical Design and Testing Vol 5, No 1 (2023): Article in Press
Publisher : Departemen Teknik Mesin dan Industri, Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/jmdt.85645

Abstract

PT. PLN Indonesia Power Suralaya Power Generation Unit requires its operators on the local ground floor to wear safety helmets to prevent head injuries while performing their tasks. Observation of workers wearing safety helmet must be ensured by the company to prevent head injury by operators. The Culture Transformation Program of K3 PT PLN Indonesia Power brings a new observation method to detect safety helmet wearing of operator local ground floor using real-time detection. YOLOv3 is an application which can be used to real-time detection helmet wearing of workers using the darknet53 algorithm based on YOLOv1 and YOLOv2 by using data images that have been collected. Based on YOLOv3 model, the improved version of YOLOv3 is proposed to improve accuracy and speed detection of safety helmet wearing by combining multi-scale detection training. Different YOLOv3 versions will be used to compare results of helmet recognition. The improved YOLOv3 show results 96.63% mAP50 and 725,711 milliseconds better than the other versions of YOLO to detect helmet safety. The experimental result show that the improved YOLOv3 have satisfying with the detection speed and accuracy of safety helmet wearing detection by operators at PT PLN Indonesia Power Suralaya Power Generation Unit.

Page 6 of 6 | Total Record : 58

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