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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 90 Documents
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Hydropower Plant Generation Forecasting using Long Short-Term Memory (LSTM) for Optimizing Water Utilization Wibowo, Yoggy Aji; Afanda, Muhammad Daniyal; Azmi, Yuzka
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.108699

Abstract

Hydropower plants face significant challenges with water availability as climate change increases weather uncertainty, affecting water usage efficiency. To improve the efficiency of water usage, decision-making should be based on long-term data and prediction methods beyond just water levels and weather forecasts. Therefore, improvements are needed in decision-making regarding operating patterns to increase hydropower efficiency. Long Short-Term Memory (LSTM) methods in water use prediction offer an innovative approach to increase efficiency and reduce waste of water resources. LSTM, a variant of Recurrent Neural Network (RNN), can recognize long-term patterns and dependencies in time series data, making it ideal for predicting fluctuating energy production capacity. By applying LSTM to predict production energy, a more accurate and reliable prediction model could be obtained. The model is designed to enhance water use predictions, optimize hydropower operations for efficient resource management, and support scientific basis decision-making based on data in water management. Experimental results show a lower error according to its predictive capacity with the normalized RMSE of 0.06170 and 0.96391 R2 value. The results can then be used in real operation scenarios. It is concluded that the LSTM model is a good strategy for the forecast of water flow for the study of hydroelectric turbine efficiency. This paper discusses the forecasting strategy of production capacity at PM Noor, which uses the LSTM method to assist operation scenarios.
Dehumidifier Box Installation in Electro-Hydraulic Control Oil Tank System to Improve Asset Reliability Program Ruswandi, Isya Agung; Niman, Dede; Anggriawan, Egi
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.108700

Abstract

Phosphate ester is a synthetic lubricant with the advantage of being a fluid that has excellent heat resistance/ fire-resistant fluid. Therefore, phosphate ester oil is widely used in EHC (Electro-Hydraulic Control) systems to regulate the opening of high-temperature steam valves, such as those used in Control Oil Steam 4.3 at PT PLN Indonesia Power Priok Block 4. Despite its advantages, phosphate ester oil has a natural hygroscopic property that allows it to absorb water from the atmosphere. This can initiate the hydrolysis process, which can lead to oil deterioration. In this study, the behavior of the water absorption rate by phosphate ester was observed under ambient humidity conditions from year 2020 to 2023. Subsequently, an innovative dehumidifier box was designed based on the idea of controlling humidity around the control oil tank and was implemented in October 2023. Observations were conducted again for nine months to monitor the behavior of the water absorption rate by phosphate ester under controlled humidity conditions. The results of the observation of the water absorption rate by phosphate ester under ambient humidity (50- 80%) showed a high increase of 24 to 62 ppm per month, causing the water content to exceed the warning limit (max. 1000 ppm), necessitating high maintenance costs ranging from Rp 37,830,000 to Rp 363,584,000 or more annually to maintain the quality of the lubricant. In contrast, the results of the observation of the water absorption rate under controlled humidity conditions (20%) showed a much lower rate of 19 ppm per month, not exceeding the warning limit. Based on these findings, it can be concluded that humidity control using the innovative dehumidifier box significantly reduces the water absorption rate by phosphate ester oil, thereby minimizing oil deterioration and saving maintenance costs.
Generator Early Warning System Based on Partial Discharge & Operation Parameters to Prevent Catastrophic Failure Mahardhika, Aditya; Prayogo, Bobby
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.108701

Abstract

Generators are essential components in the power generation industry, responsible for maintaining a continuous and reliable electricity supply. Ensuring their health is critical to avoid costly downtime and catastrophic failures. Traditional offline health assessments delay the detection of potential issues and may not provide accurate diagnostics. Partial Discharge (PD) analysis has become a valuable tool for identifying insulation faults in generator stators by measuring discharge magnitudes. However, despite the implementation of PD technology, catastrophic failures still occur, often due to a lack of understanding of PD analysis and the absence of an effective early warning system. To address these issues, an innovative online early warning system has been developed, utilizing Digital Signal Input Modules (DSIM) connected to Program Vision for real-time data collection and PD analysis. This system significantly enhances diagnostic capabilities by not only monitoring PD magnitude trends but also incorporating operational parameter comparisons to swiftly identify the source of any anomalies. The creation of a comprehensive online monitoring dashboard, which integrates all generator operational parameters, enables real-time health assessments and provides operators with actionable insights, thereby improving maintenance strategies and drastically reducing the risk of unexpected failures. This enhanced system empowers operators to proactively address potential issues, ensuring greater generator reliability and minimizing operational disruptions.
Pseudo-Oxidation In Lubricants Induced by FAME Ahbab, Muhammad Nurul; Febriyanto, Luddy; Purwanto, Tri; Abiyoso, Bow; Wikan, Yosua Pribadi
Journal of Mechanical Design and Testing Vol 7, No 2 (2025): Article in Press
Publisher : Department of Mechanical and Industrial Engineering

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/jmdt.104097

Abstract

The application of biodiesel in Indonesia is a necessity that in each period experiences an increase in percentage beginning from B2.5, B10, B15, B20, B30 to B35 and even possibly up to B100. The application of biodiesel in all segments, such as shipping, mining, and power plants, has technical issues that are always interesting to be studied by many researchers in the world. This  paper presents an experimental study on the potential for pseudo-oxidation phenomena in lubricants due to biodiesel contamination in lubricants, which is likely to be read as oxidation in FTIR testing. This can occur due to the Fatty Acid Methyl Ester (FAME) content in biodiesel and lubricant oxidation products having identical C=O (carbonyl) groups so that the possibility of wavenumbers detected between FAME and oxidation can influence each other's interpretation. Therefore, experimental studies are essential to simplify the interpretation of used lubricant samples that may be contaminated with biodiesel. By conducting controlled experiments, it becomes easier to distinguish between actual oxidation and the pseudo-oxidation effect caused by biodiesel contamination. This is crucial to ensure accurate condition monitoring and effective maintenance strategies in various industrial applications.
Perancangan Boiler Circulating Fluidized Bed Berkapasitas 400 MWth Berbahan Bakar Biomassa Fadhlurrohman, Muhammad Fauzaan; Mahardika, Muslim; Salim, Urip Agus; Arivfianto, Budi; Yazid, Haidar Azhar
Journal of Mechanical Design and Testing Vol 7, No 2 (2025): Article in Press
Publisher : Department of Mechanical and Industrial Engineering

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/jmdt.107478

Abstract

Penelitian ini bertujuan untuk merancang boiler Circulating Fluidized Bed (CFB) dengan biomassa sebagai bahan bakar utama. Biomassa adalah sumber energi yang ramah lingkungan, sehingga dapat mendukung upaya mengurangi pencemaran lingkungan. Perancangan melibatkan perhitungan dimensi boiler dan simulasi Computational Fluid Dynamics (CFD). Perhitungan didasari oleh target kapasitas termal dan properti bahan bakar biomassa. Simulasi dilakukan untuk mengetahui distribusi suhu serta aliran partikel fluida di seluruh boiler selama proses pembakaran. Hasil penelitian menunjukkan bahwa boiler yang dirancang memiliki tinggi dimensi furnace sebesar 29,38 m dengan 2 cyclone berdiameter 6,55 m. Hasil simulasi numerik ditampilkan dalam bentuk visualisasi aliran dan distribusi suhu di dalam boiler. Simulasi tersebut menunjukkan suhu di daerah boiler sebesar 600 – 930 K dan kecepatan 0 – 28 m/s.
Improving Grati 1.5 MWp Land-based Bifacial PV Production by Increasing Albedo with White Coral Purwanto, Didik; Ridho, Muhammad Hafizh; Setyawan, Erwin
Journal of Mechanical Design and Testing Vol 7, No 2 (2025): Article in Press
Publisher : Department of Mechanical and Industrial Engineering

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/jmdt.114907

Abstract

Grati Combined Cycle Power Plant (CCPP) operates a Land-based PV with 1.5 MWp bifacial solar panel modules. Currently, the solar irradiance has not been absorbed optimally yet because the bottom surface of the bifacial has not been utilized. Therefore, it requires a material which functions to reflect the irradiance of the sun so that the bottom surface of the bifacial PV can absorb the irradiance. In this case, the white coral is chosen to apply as a reflector, due to its high albedo value, available and low price. This research aims to see how large the improvement of the white coral in increasing the Grati Land-based PV production. This research is to compare it with soil albedo through a literature study, field survey, PVsyst simulation and the calculation of actual increase percentage in PV production. Based on the measurement of PV production, the usage of white coral as a reflector below the bifacial panel can increase the PV production amounts 3.8% higher than the soil albedo.
Analysis of Intermittent Electrical Shutdown Electrostatic Precipitator Method in Enhancing Energy Efficiency Ilham, Muhammad Farras; Zulthoni, Yahya; Riantono, Kris
Journal of Mechanical Design and Testing Vol 7, No 2 (2025): Article in Press
Publisher : Department of Mechanical and Industrial Engineering

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/jmdt.114909

Abstract

The Electrostatic Precipitator (ESP) is a critical component in Coal-Fired Power Plants, responsible for capturing fine dust particles from the exhaust gases produced during coal combustion. The ESP operates by using electrically charged electrodes to attract dust particles; however, dislodging the dust adhered to these electrodes can be challenging, even with the use of Hammer Rapping. A novel method known as Intermittent Shutdown ESP (IES) involves periodically turning off the electrical charge on the electrodes, making it easier for the adhered dust to be released from the electrode plates. This theoretical study aims to analyze the potential benefits of the Intermittent Shutdown ESP method in improving energy efficiency and dust removal performance. The research focuses on calculating energy consumption in the operation of the ESP and comparing the performance of ESP with and without the IES method. Utilizing a quantitative approach, this study models the performance of ESP and analyzes energy consumption data, primarily focusing on the rectifier transformers while excluding contributions from hopper heaters, box heaters, and rappers. The findings reveal that the IES method significantly reduces energy consumption, achieving savings of approximately 44.1 kWh per operational cycle, with monthly and annual energy savings of 31.717,5 kWh and 380.610 kWh, respectively. This translates to substantial cost reductions, with potential monthly savings of Rp 53,3 million and annual savings of Rp 640 million. The IES method also enhances the overall efficiency and reliability of ESP systems by reducing the energy load across all fields. In conclusion, the IES method presents a viable and cost- effective strategy for optimizing ESP operations, contributing to both energy efficiency and cost savings in Coal-Fired Power Plants.
Maximum Biomass Co-Firing Percentage Mixture on 100 MW Pulverized Coal Boiler Using GateCycle Simulation Modelling Febriant, FX Adeodatus Alfa; Firdaus, Reza; Khoir, Miftahul
Journal of Mechanical Design and Testing Vol 7, No 2 (2025): Article in Press
Publisher : Department of Mechanical and Industrial Engineering

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/jmdt.114910

Abstract

Abstract—For establishing Indonesia’s NZE target in 2060, biomass co-firing in existing Coal Fired Power Plant (CFPP) is one of the best and applicable method. This paper shows maximum biomass percentage on 100 MW scaled PC Boiler CFPP can handle by using GateCycle simulation. From the simulation, by increasing biomass mixture entering the furnace, it will increase total fuel flow in order to produce 100 MW. Biomass mixtures higher than 8% will tend to required total fuel flow exceeding maximum mill capacity which is 45,000 kg/hour, or reduced Generator Load while setting total fuel flow entering furnace same with maximum mill capacity. For every 1% increasing biomass mixture above 8%, it will reduced Gross Generator Load by 0.7505 MW. Increasing will also potentially increase slagging rate as the furnace temperature calculated from GateCycle simulation is 1,258.11 0C to 1,276.07 0C, while the ash fusion temperature of biomass is 1,185 0C. Also, increasing 1% of biomass mixture will increase the Specific Fuel Consumption by 0.0028 kg/kwh. From the simulation it is stated that maximum biomass percentage allowed for PC Boiler is 8%.
Utilization of AHP-TOPSIS Combination to Determine The Best Biomass Dryer Technology at Pelabuhan Ratu CFPP Hermawan, Heru
Journal of Mechanical Design and Testing Vol 7, No 2 (2025): Article in Press
Publisher : Department of Mechanical and Industrial Engineering

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/jmdt.114911

Abstract

The main challenge of biomass cofiring at Pelabuhan Ratu Power Plant is the high moisture and low calorific value of the biomass (sawdust). This biomass characteristic causes low green energy production despite high biomass utilization. Meanwhile, the green energy production target continues to increase in the upcoming year, according to PLN's Cofiring Roadmap. This research focuses on the selection of biomass dryers using Multi-Criteria Decision Making, including rotary dryers, packed moving bed dryers, and flash dryers. The method used was the Analytical Hierarchy Process (AHP) and Technique for Order of Preference by Similarity to Ideal Solution (TOPSIS) using four criteria and eight sub- criteria. Seven experts were asked to complete the criteria ranking questionnaire for AHP input. Other relevant data were also collected, such as operational data, risk management, internal discussions, literature studies, and others. The top 3 criteria with the highest global weight (AHP results) are Biomass Characteristics (28.1%), Safety (20.5%), and Environment (17.8%). TOPSIS calculation resulted in the rotary dryer being the best alternative biomass dryer. Furthermore, a sensitivity test was conducted by changing the weight of each of the top 3 criteria by -25% and +25%. The results show that the rotary dryer is consistently the best alternative.
Redundancy Module Supply in Fuel Gas Compressor Header Pressure System: An Anti-Blackout Effort at Priok Power Generation Block Three Pradana, Dwi Setyo; Wicaksono, Adam; Sukisworo, Mochamad Andrew
Journal of Mechanical Design and Testing Vol 7, No 2 (2025): Article in Press
Publisher : Department of Mechanical and Industrial Engineering

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/jmdt.114914

Abstract

System Pressure has a vital role to control the pressure of the header gas output from the fuel gas compressor which distributed to each Gas Turbine (GT) as the main supply of fuel for the operating needs of the gas turbine. On June 10, 2021, there was a disruption in the fuel gas compressor caused by a malfunction in the pressure system due to an abnormal voltage supply to the pressure transmitter which resulted in the Priok Power Generation block 3 experiencing a blackout. The purpose of this study is to prevent system failure by making modifications in the form of implementing redundancy power supply modules. The conclusion from the results of the modification shows that there has never been a recurrence of the incident since it was installed for the redundancy power supply modules of the pressure Fuel Gas Compressor (FGC) system. The implementation of the module can prevent blackouts, increase system reliability number 0.995, and effective mean time to failures (MTTF) of system 35,700,000 hours. The modification design using switch ensures continuous power without interruption.

Page 9 of 9 | Total Record : 90

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