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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 6 Documents
 1 
Search results for , issue "Vol 6, No 1 (2024): Articles" : 6 Documents clear
Karakteristik dan Temperatur Nyala Api Pembakaran Biodiesel Berdasarkan Kadar Fatty Acid Methyl Esters Topayung, Christian Yuda; Nuryadin, Shakti; Sentanuhady, Jayan
Journal of Mechanical Design and Testing Vol 6, No 1 (2024): Articles
Publisher : Department of Mechanical and Industrial Engineering

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/jmdt.95190

Abstract

Meningkatnya penerapan biodiesel yang bertujuan untuk suplementasi secara keseluruh atau sebagian bahan bakar untuk proses pembakaran dalam berbagai aplikasi industri memerlukan studi lebih lanjut mengenai karakteristik yang dihasilkan dari proses tersebut. Oleh karena itu, penelitian ini bertujuan untuk mengkaji karakteristik pembakaran berbagai macam bahan bakar campuran yang dipengaruhi oleh variasi persentase biodiesel FAME (fatty acid methyl esters) yang berasal dari minyak sawit sebagai penggantinya, yang dilakukan dengan menggunakan alat burner. Bahan bakar disemprotkan dengan nosel 60 derajat berkapasitas 5 galon per jam. Parameter yang diukur adalah panjang nyala api berdasarkan waktu, kecepatan rambat nyala api dengan percepatan pada posisi axial di depan nosel, dan profil temperatur nyala api. Temuan penelitian ini menunjukkan bahwa bahan bakar dengan persentase campuran FAME yang lebih rendah mengakibatkan proses pembakaran yang menghasilkan nyala api dengan nilai yang lebih tinggi pada parameter yang diamati, dan seiring bertambahnya persentase, nilainya terus menurun. Pengamatan ini dapat menghasilkan kesimpulan bahwa properties bahan bakar seperti densitas dan viskositas bervariasi atau dipengaruhi berdasarkan persentase  bahan bakar.
Studi Sifat Keterbasahan pada Material Slumpring Bambu dengan Metode Pengukuran Sudut Kontak Permukaan Ahmad, Yusuf; Kusumaningtyas, Indraswari; Parikesit, Gea Oswah Fatah
Journal of Mechanical Design and Testing Vol 6, No 1 (2024): Articles
Publisher : Department of Mechanical and Industrial Engineering

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/jmdt.97743

Abstract

Slumpring merupakan istilah dalam Bahasa Jawa untuk pelepah yang menyelubungi ruas batang bambu. Salah satu pemanfaatan slumpring ini ditemukan pada alat musik bundengan. Sebelum dimainkan oleh musisi, biasanya bundengan dilakukan proses perendaman untuk menghasilkan bunyi yang enak didengar. Selain itu zaman dahulu bundengan ini juga dimanfaatkan sebagai tudung pelindung hujan oleh penggembala bebek. Hal ini membuat interaksi slumpring dan air terlihat unik. Dari informasi tersebut menimbulkan sebuah dugaan bahwa slumpring memiliki dua sifat keterbasahan yaitu hidrofilik berdasarkan perlakuan oleh musisi terhadap bundengandanhidrofobik berdasarkan pemanfaatan bundengan oleh penggembala bebek. Penelitian ini bertujuan untuk memastikan dugaan tersebut dengan menganalisis sudut kontak pada dinding luar dan dinding dalam slumpring. Tidak hanya itu, penelitian ini juga mengukur sudut kontak yang terjadi pada area tengah dan tepi slumpring. Penelitian ini menggunakan peralatan sederhana dan telepon cerdas untuk merekam citra sudut kontak. Analisis citra yang dilakukan menggunakan bantuan perangkat lunak ImageJ. Hasilnya kedua dinding dengan masing-masing sisinya ternyata memiliki sifat hidrofilik. Sudut kontak dinding luar area tengah dan tepi bernilai 60,4±8,4° dan 60,7±12,4° sedangkan sudut kontak dinding dalam area tengah dan tepi bernilai 42,1±9,7° dan 47,5±1,2°.
Experimental Investigation of Premixed LPG-Air Emission Profile During Flame Impingement Process Israq, Imam; Nuryadin, Shakti; Sentanuhady, Jayan
Journal of Mechanical Design and Testing Vol 6, No 1 (2024): Articles
Publisher : Department of Mechanical and Industrial Engineering

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/jmdt.97745

Abstract

In the present study, emission profile of premixed 90% propane-10% butane flame, namely LPG (Liquified Petroleum Gas) was experimentally investigated. The fuel was mixed in premixed chamber which then ignited through 2 mm nozzle diameter. The fuel flow was controlled via solenoid valve installed upstream the burner body. This valve is synchronized with high-speed camera and thus, the flame kernel propagation can be captured.  In this experiment, the effect of equivalence ratio, initial pressure, and separation distance (H/D) on combustion emissions and flames that produced from a mixture of LPG-air fuel was investigated. The flue gas analyser probe was installed inside the contained flame impingement test allowing to record CO, CO2, and unburnt HC data. The variation of the equivalence ratio used in this study are 0.8, 1.0, and 1.2. For variations in initial pressure used, 1 bar, 1.2 bar, and 1.4 bar. Variation of separation distance (H/D) that will be used are 4.5, 5.5, and 6.5. The result of this experiment shows that CO increases with increase in equivalence ratio, and initial pressure of premixed gas. For separation distance CO level decreases as the plate progressively moves away from the nozzle. CO and CO2 concentration increases as the equivalence ratio and initial pressure increases. The highest average CO concentration was 183 ppm that was found in ER 1.2 with the lowest H/D. Highest mean CO2 concentration was found in the same ER with the highest H/D, which was 4267 ppm.
Implementation of Advanced Coal-Biomass Blending and Fuel Stock Management at Pelabuhan Ratu Power Plant Nurahman, Herowiko Thama; Hermawan, Heru
Journal of Mechanical Design and Testing Vol 6, No 1 (2024): Articles
Publisher : Department of Mechanical and Industrial Engineering

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/jmdt.97746

Abstract

The issue of climate change is of particular concern to countries around the world, including Indonesia. Many efforts are being and will be made to contribute to addressing climate change issues. Pelabuhan Ratu Power Plant (3 x 350 MW) belongs to PT PLN Indonesia Power. In line with the PLN Transformation (GREEN aspect) and the PT PLN Indonesia Power program ("Green Boosters"), Pelabuhan Ratu Power Plant contributes to produce low-carbon sustainable energy by cofiring biomass (sawdust). There are two main challenges in implementing cofiring. The first is the poor biomass handling and blending methods that are typically used in power plants. The second is the low calorific value of coal and biomass blending due to the improper blending process. To overcome these challenges, Pelabuhan Ratu Power Plant has developed an advanced coal-biomass blending and fuel stock management digitalization. By applying advanced method of coal-biomass blend, the biomass utilization (total, monthly average, and daily average) increased significantly in 2022 and 2023. Total biomass utilization increased up to 171% and still possible to be higher. The green energy production increased up to 255% and GHG emission reduced up to 255%. The fuel stock management provides optimal blending recommendations as operators' guidelines. As a result, potential derating loss due to low calorific value of blended products can be reduced by 59.9%.
A Linear Regression Modeling Analysis of the Energy, Water, and Chemical Consumption in the Operating Configuration at 740 MW Priok Combined Cycle Power Plant Muhammad, Raihan; Rahman, Arief; Jamil, Muhamad Fauzi
Journal of Mechanical Design and Testing Vol 6, No 1 (2024): Articles
Publisher : Department of Mechanical and Industrial Engineering

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/jmdt.97748

Abstract

In realizing efficient energy use, the Government of Indonesia has issued a National Energy Policy in Government Regulation (Peraturan Pemerintah) No. 70 of 2009 concerning Energy Conservation, PT PLN Indonesia Power Priok Unit has carried out efficient operational activities. Therefore, to support the company's sustainability and operational performance, especially in terms of efficiency and operational activities, it is necessary to evaluate the process of energy use. The Combine Cycle Power Plant (CCPP) has several operating configurations according to the gas turbine, heat recovery steam generator (HRSG), and steam turbine amount. CCPP Priok Blok 3 operates full-block 2-2-1 or half-block 1-1-1, which means one gas turbine, HRSG, and steam turbine. This configuration of operation impacts the use of energy, water, and chemicals. For this reason, this project aims to model the use of energy, water, and chemicals using linear regression to determine which operating configurations are highly effective in using energy, water, and chemicals. The result of this linear regression modeling is that at the peak load, operation GT2 (gas turbine 2) is more energy efficient, 1.93% more efficient than GT1, than GT1 (gas turbine 1). At the minimum load, GT1 is 9.36% more energy efficient than GT2. At the same time, the water consumption of GT2 is 35.01% more efficient than that of GT1.
New Alignment Method Using Hydraulic Jack for Accelerating SWD 16 TM 410 R Engine and Generator Coupling Nugroho, Satriyo Dwi; Fajriannur, Fajriannur
Journal of Mechanical Design and Testing Vol 6, No 1 (2024): Articles
Publisher : Department of Mechanical and Industrial Engineering

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/jmdt.97749

Abstract

In 2019, the #6 PLTD Trisakti SWD (Stork Werkspoor Diesel) 16 TM 410 R underwent critical engine rehabilitation due to severe issues that had persisted since 2018. The rehabilitation necessitated the replacement of the crankshaft and bedplate. Given the engine and generator positioning adjustments, an alignment process was crucial to ensure correct realignment. Subsequently, the comprehensive rehabilitation efforts, containing alignment and engine-generator coupling, were concluded in March 2021. A misalignment issue was identified during the running test program as the generator shaft exhibited an imbalance. A realignment process and reattachment of fitted bolts were considered necessary to rectify this imbalance. The previous approach for this task demanded an extensive 54-day timeframe without a guaranteed resolution. This paper will discuss a breakthrough method for shaft alignment. By applying this new method, the alignment focus is directly at the point of the farthest deviation, compared to the previous method, which had to look for the midpoint of the x and y arcs. So that the alignment process can be carried out quickly and precisely. Apart from that, this innovation also proposes a new reaming method using line boring. This tool works more effectively than hand reaming, which requires more time and manpower. This innovation achieved an exceptional 81% reduction in processing time, concurrently leading to a significant decrease in the requisite workforce. 

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