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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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INDONESIA
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 83 Documents
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Multi-Criteria Decision-Making The Selection of IoT-Based Inverter Smart Grid System and Smart Meter for Solar Photovoltaic and Wind Turbine Installations in Pelabuhan Ratu CFPP using AHP & TOPSIS Method Prayogo, Bobby; Yudisaputro, Hendra
Journal of Mechanical Design and Testing Vol 6, No 2 (2024): Articles
Publisher : Department of Mechanical and Industrial Engineering

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/jmdt.101112

Abstract

The selection of appropriate inverters is pivotal in maximizing the efficiency and performance of solar photovoltaic (PV) and wind turbine systems, as they directly impact the overall energy conversion efficiency and system output by influencing efficiency and reliability. Inverter selection also encompasses critical criteria like cost, compatibility with renewable energy sources, and environmental considerations. Thus, an exhaustive and systematic approach is essential to effectively evaluate and compare different inverter options. This study employs multi- criteria decision-making to address these challenges, evaluating the identified criteria using the Analytical Hierarchy Process (AHP) and ranking them to determine the optimal solution via Technique for Order of Preference by Similarity to the Ideal Solution (TOPSIS). Consequently, the investigation identifies smart grid and smart meter inverters as the ideal solutions, successfully addressing concerns regarding power stability, communication and connectivity, security, data management, and cost. The proposed methodology yields a substantial total equity portion of USD 9,325.71, accompanied by impressive earnings before interest, taxes, depreciation, and amortization (EBITDA) of USD 1,734.09 per year. The estimated payback period is 6.85 years, and the return on investment (ROI) reaches a remarkable 338.07%. Additionally, the net income significantly reduces the production cost, with USD 40,853.34 in a single period.
Improved Power Plant Performance Utilizing Hybrid Performance Test Execution (HYPER-X) Satyadi, Hakim; Kurniawan, Agus; Fadholi, Fadholi
Journal of Mechanical Design and Testing Vol 6, No 2 (2024): Articles
Publisher : Department of Mechanical and Industrial Engineering

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/jmdt.102255

Abstract

Alongside the PLN Transformation Program, digitization has emerged as a crucial foundation that the company continues to develop amidst the disruptions caused by modern technology. This effort aims to establish lean and cost-efficient processes. Therefore, companies ensure sustainability and maintain competitiveness amidst increasingly fierce future competition. To establish lean and cost-efficient processes Currently, performance tests are carried out conventionally by collecting data through trending DCS (Distributed Control System) and processing data using Excel, which is carried out once a month for each unit. From this, the performance test results for each unit are only obtained once a month so that the performance of new units can be seen over a long period. Therefore, a longer period is required to observe the performance of new units. To solve the problem above, a performance test unit process was made with a newer concept, namely by adding digitization in it, namely hybrid performance test execution, abbreviated as Hyper-X, the hope is that from the start data collection and processing can be done quickly so that unit performance conditions can be obtained more quickly. Fast and can be monitored in real time. The results obtained from Hyper-X are in the form of energy power indicators, heat rate losses, and costs as well as analysis and recommendations that can provide operating guidelines so that the unit operates more optimally and efficiently. Hyper-X can reduce the potential loss heat rate by 35 kcal/kwh or equivalence with IDR 141,560,000.00. As for other benefits obtained, it facilitates the identification of areas experiencing heat rate losses determines the follow-up execution steps for repairs and fosters a professional and learner culture to solve problems.
Modelling Back Pressure Power Plant to Increase Reliability and Decrease Self Power Consumption by Utilizing Residual Main Steam Fuad, Muhammad Zainul; Afandi, Yunus; Ridho, Redho Nur
Journal of Mechanical Design and Testing Vol 6, No 2 (2024): Articles
Publisher : Department of Mechanical and Industrial Engineering

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/jmdt.102257

Abstract

The amount of steam wasted at the Kamojang PLTP in the last 4 years is quite large, having an energy potential of 7 MW (110 tons / hour) due to low unit loading dispatch, this change is not offset by the electrical energy consumption of auxiliary unit equipment so that the percentage of self-use performance (%PS) increases. In addition to the problem that office electricity loads and essential generation are still supplied by the grid (PLN) which is charged every month as an industrial customer, this results in the inability to houseload because the comporessor vent valve is supplied by grid voltage. For this reason, modeling research on the design of electricity sources was carried out that utilized the large amount of steam wasted in the Kamojang PLTP from the vent valve in the form of a back pressure type PLTP which was distributed to the 6.3 kV self-use system of the Kamojang PLTP unit. The PLTP design is modeled using cycle tempo to get power (MW) turbine generator, using Homer for financial analysis of PLTP back pressure and using ETAP to simulate the load flow of PLTP back pressure against the 6.3 kV Kamojang PLTP self-use system. Based on cycle tempo simulations and with some assumptions that the back pressure PLTP requires a steam flow of 76 tons / hour or 5 MW, and based on simulations when there is a black out of its own usage load, the Kamojang PLTP is still operating normally, which means that the unit is able to houseload and is ready to sync again faster if needed. Over the past 4 years PLTP Kamojang has lost the opportunity to reduce the %PS value by 3.34% during, and the realization of PLTP back pressure requires funds of $ 6,325 and will return on investment for about 1 year assuming the essential burden is fully borne throughout the year by PLTP back pressure.
Preventing Turbine High Vibration by Upgrading the Balance Weight Material at PLTP Darajat Ropandi, Opan; Hakim, Maman Mulyana; Baraka, Muhammad Aqmal
Journal of Mechanical Design and Testing Vol 6, No 2 (2024): Articles
Publisher : Department of Mechanical and Industrial Engineering

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/jmdt.102258

Abstract

Due to its direct contact with high- pressure steam, the turbine rotor is an essential part of geothermal power plants. A balance weight located in the fifth stage of rotor turbine to prevent initial unbalance in the turbine rotor. Due to erosion and sulfur attacks, the balancing weight of PLTP Darajat is frequently damaged, which is evident by the formation of unbalance. On December 2020, when shutting down, PLTP Darajat encountered considerable vibration disturbance, at 1400 RPM rotation, it reached 104 m [P-P]. It was essential to balance the turbine rotor by adding a new balance weight after a borescope test revealed that balance weight erosion was 50%. An examination of the shape, erosion resistance, and sulfur resistance of the turbine balancing weight material was done to reduce the likelihood of erosion disturbances. At one time. PLTP Darajat utilized materials including SS-410, Tungsten Alloy, and 17-4PH. In this research we used the balance weight of Inconel 625 material. Next, we tested the material based on the Chromium (Cr), Copper (Cu) and material hardness (HB) values. Inconel 625 at 23% had the greatest material composition based on Cr value, 17-4PH at 4% based on Cu value, and 17-4PH at 298 based on HB value, according to the study’s finding. With a combination of Cr 23%, Cu 0%, and HB 255, Inconel 625 material had the best combination. We conclude that a material's resistance to erosion and sulfur will increase with increasing Cr and Cu levels. Compared to other materials, Inconel 625 exhibits superior resistance to erosion and sulfur. By applying this material we were able to avoid an increase in vibration in the turbine and an increase in service hours of 281 hours.
Early Warning Detection for Pulverizer Abnormalities Unit 2 Suralaya PGU 1 × 400 MW with Noise Spectrum Analysis Ruaz, Firlan Maulana
Journal of Mechanical Design and Testing Vol 6, No 2 (2024): Articles
Publisher : Department of Mechanical and Industrial Engineering

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/jmdt.102261

Abstract

The coal pulverizer/mill abnormalities in coal power plants significantly affect the corporation’s reliability level. This paper introduces an early warning system for detecting pulverizer/mill abnormalities, specifically in PT PLN Indonesia Power's Suralaya PGU Unit 2 1x400 MW. Acoustic data from pulverizer 2E in Unit 2 of PT PLN Indonesia Power's Suralaya PGU were collected between September 2022 and September 2023. This dataset was acquired through recording devices and subsequently processed and visualized using MATLAB with the establishment of upper and lower threshold values based on recorded data during periods when the pulverizer is inoperative and when the pulverizer exhibits abnormal sound patterns. This paper reveals a correlation between increased sound abnormalities and the cumulative operational hours of the pulverizer. The results underscore that as the pulverizer operational hours accumulate, vibrations become more occurred. This paper introduces a novel approach to pulverizer/mill maintenance from the conventional strategy of interval-based maintenance every 3000 operating hours of the pulverizer, to a real- time graph-based strategy using data processed with MATLAB. This approach proposes a comprehensive enhancement of maintenance strategy within coal power plant pulverizers.
Analysis of the Effect of Inlet Compressor Temperature on the Thermal Efficiency of PLTG Unit 3.2 in Grati Purwanto, Didik
Journal of Mechanical Design and Testing Vol 6, No 2 (2024): Articles
Publisher : Department of Mechanical and Industrial Engineering

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/jmdt.102262

Abstract

PLTGU Grati block 3 has two gas turbines, namely unit 3.1 and unit 3.2, with a Net Capacity of 145 MW for each gas turbine. In PLTG unit 3.2 Grati, there is an issue related to differences in thermal efficiency values caused by changes in the inlet compressor temperature. The thermal efficiency value of PLTG unit 3.2 Grati is high when the compressor's inlet temperature is low. Therefore, to determine the effect of the compressor's inlet temperature on the thermal efficiency value of PLTG unit 3.2, a calculation process of parameters affecting thermal efficiency values is conducted for analysis purposes. In this research, calculations were performed for three compressor inlet temperature data points, namely at temperatures of 296.69 K, 299.49 K, and 304.11 K, resulting in gas turbine thermal efficiency values of 32.17%, 31.84%, and 31.79%, respectively. Based on the calculation results, it is shown that as the compressor's inlet temperature increases, the thermal efficiency value decreases.
Analisis Reverse Engineering L-Bracket dan Cross Member Pada Perisai Kolong Al Ihsan, Rozaan Faros; Pratama, Wisnu Bayu; Handoko, Handoko; Kurniawan, Wingky; Basuki, Budi; Wibowo, Setyawan Bekti
Journal of Mechanical Design and Testing Vol 7, No 1 (2025): Articles
Publisher : Department of Mechanical and Industrial Engineering

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/jmdt.85959

Abstract

Komponen perisai kolong (side guard) pada truk komersial, merupakan komponen baru yang wajib harus dimiliki oleh truk yang beroperasi di Indonesia. Kewajiban ini harus dipenuhi oleh truk komersial, dan tercantum pada Peraturan Menteri Perhubungan Republik Indonesia nomor 74 Tahun 2021 tentang perlengkapan keselamatan kendaraan bermotor. Peraturan tersebut dilatarbelakangi oleh banyaknya kecelakaan tabrak kolong (Underride) yang terjadi. Side guard wajib dimiliki oleh seluruh kendaraan komersial dan terpasang dari perusahaan pembuat sampai dengan karoseri sebagai safety dan regulasi. Side guard dari perusahaan pembuat nantinya tidak digunakan kembali setelah kendaraan sampai karoseri. Perusahaan terkait mengeluarkan biaya yang tinggi untuk membuat side guard untuk komponen bracket dan crossmember. Maka dalam penelitian ini akan dilakukan optimalisasi desain bracket dan cross member sebagai komponen utama penyusun rangkaian komponen side guard untuk mengurangi biaya produksi. Optimasi desain akan dilakukan menggunakan metode analisis reverse engineering, metode analisis CAE (Computer Aided Engineering) dengan bantuan software CATIA, dan analisis cost reduction untuk melihat cost down yang terjadi. Pada penelitian ini akan menggunakan metode penelitian kualitatif dan kuantitatif pada pembahasan analisis CAE. Hasil penelitian dari aktual cases ini didapatkan desain baru hasil optimasi pada L-bracket, pengurangan thickness pada L-bracket dan cross member, hasil analisis CAE pada single part (L-bracket dan cross member) dan assembly part (ROH (Rear Overhang) dan Wheelbase Assy), dan cost down yang didapatkan dari hasil optimasi desain. Setelah dilakukan penelitian dan pembahasan maka disimpulkan bahwa optimasi desain yang dilakukan dapat memangkas biaya produksi perisai kolong sebesar 54,7% pada cross member. Pada L-bracket nomor 1 mengalami cost down sebesar 52,7%. Kemudian, pada L-bracket nomor 2 mengalami cost down sebesar 48,3%. Secara keseluruhan dari hasil penelitian ini dapat diimplementasikan atau referensi implementasi pada rangkaian side guard.
Simulasi Karakterisasi Solar Water Heater Sistem Aktif dengan Variasi Bentuk Pipa Kapsul PCM Sidiq, Muhammad Fadel; Waluyo, Joko
Journal of Mechanical Design and Testing Vol 7, No 1 (2025): Articles
Publisher : Department of Mechanical and Industrial Engineering

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/jmdt.98503

Abstract

Pemanfaatan teknologi panel surya salah satunya solar water heater (SWH) yaitu alat pemanas air dengan menggunakan energi matahari sebagai sumber pemanas dalam sistemnya. Latent Heat Thermal Energy Storage (LHTES) adalah salah satu metode penyimpanan energi termal (TES) yang memanfaatkan sifat laten dari material untuk menyimpan energi termal. Pada penelitian ini dilakukan pengkajian mengenai pengaruh bentuk pipa PCM pada tangki penyimpanan panas SWH terhadap karakterisasi PCM (temperatur, grafik pelelehan, dan kurva pelelehan) pada proses pembebanan panas. Penelitian ini memodelkan SWH dengan spesifikasi diameter tangki 260 mm serta diameter pipa penghubung 12 mm. Kapsul PCM divariasikan dengan bentuk konsentris dan tabung dan variasi debit yaitu 1 Lpm, 4 Lpm dan 7 Lpm. Solar collector menerima fluks panas 1000 W/m², dan air disirkulasikan menggunakan pompa menuju tangki penyimpan kalor berisi paraffin wax RT 52. Hasil menunjukkan bahwa bentuk kapsul konsentris lebih efektif dalam penyerapan panas dari hot transfer fluid HTF dibandingkan bentuk tabung, terutama pada debit aliran 7 lpm. PCM bentuk konsentris mencapai fase pelelehan cair seutuhnya pada menit 70 sedangkan pada PCM berbentuk silinder waktu pelelehan fase cair terjadi pada menit ke 80 pada debit 7 LPM.   Perbedaan debit aliran juga mempengaruhi waktu pelelehan PCM secara signifikan. Dengan demikian, bentuk kapsul konsentris dapat mengoptimalkan kinerja SWH dalam penyimpanan dan pelepasan energi termal.
Electric Vehicle Battery and Motor Sizing for Yogyakarta Tourism Spots Miasa, I Made; Widyaparaga, Adhika; Sucipto, Sucipto
Journal of Mechanical Design and Testing Vol 7, No 1 (2025): Articles
Publisher : Department of Mechanical and Industrial Engineering

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/jmdt.105334

Abstract

Pertumbuhan pariwisata di Daerah Istimewa Yogyakarta telah mendorong kebutuhan terhadap transportasi ramah lingkungan. Kendaraan listrik (EV) menjadi solusi untuk mengurangi emisi karbon dan meningkatkan kenyamanan wisatawan. Studi ini dilakukan untuk menentukan spesifikasi optimal EV untuk rute tujuan wisata lokal di Provinsi Yogyakarta melalui survei lapangan dan preferensi wisatawan. Analisis mencakup perhitungan daya dan torsi motor listrik berdasarkan hambatan gerak serta kebutuhan energi untuk menentukan kapasitas baterai optimal dalam dua skenario: tanpa dan dengan stasiun pengisian daya. Hasil kajian menunjukkan bahwa rute wisata di Mangunan, dengan elevasi signifikan, memerlukan daya lebih besar dibandingkan rute datar seperti Kraton–Gumuk Pasir. Kapasitas baterai bervariasi tergantung skenario pengisian, mempertimbangkan konsumsi daya motor, pendingin udara, dan sistem keselamatan. Studi ini memberikan dasar untuk pengembangan EV wisata berkelanjutan di Yogyakarta.
Life Cycle Impact Assessment Priok Power Generation Unit: Comparison Based on Operating Time Span Wicaksono, Adam; Prayitno, Heru Pujo; Prabowo, Himawan Khalid
Journal of Mechanical Design and Testing Vol 7, No 1 (2025): Articles
Publisher : Department of Mechanical and Industrial Engineering

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/jmdt.108698

Abstract

Priok Power Generation Unit (PGU) is a combined cycle power plant (CCPP) which is one of the national vital objects with a generating capacity of 2,723 MW which functions as a load follower and Peaker in the electricity network system. This study aims to look at the environmental impact performance resulting from plant operating patterns January-December in 2020 and 2022, which was carried out using the life cycle assessment (LCA) method with SimaPro. The method life cycle impact assessment uses the ReCipe and CML IA baseline methods. The purpose of this comparison is to see improvements in the environmental performance of generating units to support sustainability. The results of this study show that there has been a change in the results of the environmental impact assessment in the Green House Gases (GHG) and Land Use Change (LUC) are the impact categories with the most significant reduction, namely more than 90%. Meanwhile, water footprints are the only impact that experiences an increase in environmental impacts during the 2020 operating period compared to the 2022 operating period.

Page 8 of 9 | Total Record : 83

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