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All Journal Jurnal Teknik Mesin Indonesia Interdisciplinary Social Studies Journal of Social Research Jurnal Polimesin Prosiding SNTTM
Ridho Irwansyah
Universitas Indonesia
Aerospace Engineering Agriculture, Biological Sciences & Forestry Humanities Automotive Engineering Chemical Engineering, Chemistry & Bioengineering Computer Science & IT Control & Systems Engineering Economics, Econometrics & Finance Education Engineering Environmental Science Industrial & Manufacturing Engineering Languange, Linguistic, Communication & Media Materials Science & Nanotechnology Mechanical Engineering Public Health Social Sciences

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Performance of pico-scale turgo turbine bucket using coconut shells spoons with variations inlet angle and nozzle distance to hydraulic efficiency Muhammad Faridz Athaya; Warjito; Budiarso; Ridho Irwansyah; Muhamad Agil Fadhel; Muhammad Mizan
Jurnal Teknik Mesin Indonesia Vol. 18 No. 1 (2023): Jurnal Teknik Mesin Indonesia
Publisher : Badan Kerja Sama Teknik Mesin Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36289/jtmi.v18i1.429

Abstract

The United Nations Climate Change Conference of the Parties (COP26) has a main agenda, namely evaluating COP21, where the main target of COP21 is to maintain global temperature changes below 2 degrees Celsius (MoEF, 2021). Indonesia itself is committed to zero carbon emissions by 2060, and the target of a renewable energy mix by 2025 is 23%. Indonesia’s own renewable energy potential is 443 GW [13], but not all renewable energy can be used in some areas that have terrain problems. Picohydro turbines are suitable for choice, because these turbines have a relatively constant supply, can be placed in reservoirs and rivers, and are also not dependent on weather. Among several types of picohydro, the Turgo Turbine is a suitable turbine to choose, because it has cheap construction and maintenance costs, and only requires a low head. This study aims to determine the effect of changes in the inlet angle and nozzle distance on the hydraulic efficiency of turgo turbines with coconut shell blades. Variations in the entry angle are carried out, namely 10°, 20°, 30° and distance variations, namely 100 mm, 150 mm, 200 mm. Based on the results of the study, it can be concluded that the greatest hydraulic efficiency is at a variation in the entry angle of 10° with a nozzle distance of 100 mm, that is, numerically by 49%, and experimentally by 41.8%.
Improving The Use of Biogas/Biohydrogen in Dual Fuel Engines Using Response Surface Methodology (RSM) and Artificial Neural Network (ANN). Kombo, Hamza Khamis; Irwansyah, Ridho; Nasruddin, Nasruddin
Journal of Social Research Vol. 4 No. 11 (2025): Journal of Social Research
Publisher : International Journal Labs

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.55324/josr.v4i10.2833

Abstract

Growing energy demand and the need to reduce the emission of greenhouse gases have created greater interest in alternative fuels such as diesel substitutes, with biodiesel, biogas, and bio-hydrogen being rated as the viable alternatives. Biodiesel improves combustion and reduces CO and HC emissions, biogas is economically viable utilization but its efficiency is impacted by the loss resulting from the presence of CO?, and bio-hydrogen supports the development of flame, thermal efficiency, and reduces carbon-based emissions. However, issues with abnormal combustion, reduced efficiency, and high levels of NOx with high levels of substitution necessitate optimization of the parameters. In this study, Response Surface Methodology (RSM) and Artificial Neural Networks (ANN) were used to evaluated and optimize the effect of load, compression ratio, ignition pressure, and gas flow rates on engine performance and emission. RSM outputs reported load, ignition pressure, and bio-hydrogen to have strong effects on BTE, BSFC, CO, and NOx with a maximum of 40.55% BTE, 303.48 g/kWh BSFC, 2.35 g/kWh CO, and 869.78 ppm NOx. ANN models reported a good predictive capability with R² > 0.99 and were better at predicting emission trends compared to RSM. The integration of RSM and ANN offers a highly effective tool for optimizing dual-fuel diesel engines to attain improved efficiency, improved fuel utilization, and reduced emissions for green energy use.
Effect of water temperature on flow regimes and reynolds number in a passive natural circulation cooling system Setiawan, Putut Hery; Pamitran, Agus Sunjarianto; Yuliaji, Dwi; Pamungkas, Adhika Enggar; Budiman, Arif Adtyas; Amelia, Almira Citra; Maryadi, Shendy Akbar; Irwansyah, Ridho; Juarsa, Mulya
Jurnal Polimesin Vol 23, No 3 (2025): June
Publisher : Politeknik Negeri Lhokseumawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30811/jpl.v23i3.6665

Abstract

Natural circulation flow is an important phenomenon of passive cooling systems in nuclear reactor thermal management during accidents. This experimental study investigates the effect of varying water temperatures on flow regimes and Reynolds number within a passive natural circulation system. The research was conducted using a rectangular TP-loop (FASSIP-04 Ver.2) made of 1-inch SS304 pipe, 6 m high and 1.32 m wide. The water temperature setting was varied at 45°C, 55°C, 65°C, and 75°C, with a heating power of 4.2 kW, and the cooling tank was maintained at 10°C. Observations were made during transient heating, steady-state (for 3 hours), and transient cooling phases. Results show that increasing the heating tank temperature reduces fluid density and viscosity, thereby enhancing buoyancy-driven flow. This led to a transition in flow regimes from laminar to turbulent as the temperature increased. The Reynolds number increased by 169.38% when the water temperature was raised from 45°C to 75°C. Unstable flow behaviour, including fluctuating amplitudes and frequencies, was observed—characteristic of natural circulation dynamics. The study confirms a strong correlation between thermal variation and flow regime transition, providing insights into the performance of passive cooling systems under varying thermal loads.
Evaluation of Wind Energy Potential for Electricity Generation in Three Locations of Zanzibar, Tanzania Hamza Khamis Kombo; Ridho Irwansyah; Nasruddin Nasruddin
Interdisciplinary Social Studies Vol. 5 No. 1 (2025): Regular Issue: October-December 2025
Publisher : International Journal Labs

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.55324/iss.v5i1.955

Abstract

This study evaluates the wind energy potential for electricity generation in the North, South, and West regions of Zanzibar using wind speed data from NASA POWER (2014–2023). The Weibull statistical distribution indicated annual average wind speeds of 5.43 to 5.81 m/s. The South Region experienced the highest wind stability (k=7.97 in 2015), while the North had the greatest energy-carrying wind speed (6.80 m/s in 2020). Wind power density ranged from 107.87 to 132.98 W/m², and energy density varied from 944.91 to 1164.94 kWh/m²/year, confirming that all sites fall into Class 2 (Marginal) of the Pacific Northwest Laboratory standard—implying weak feasibility for large wind farms but suitability for small- to medium-scale or hybrid schemes. A technical-economic analysis of four turbines identified the De Wind D7 (1500 kW, 70 m hub height) as the most suitable, with the highest annual energy production (>1300 MWh/year) and capacity factor (>10%). The study provides crucial data to inform investments and policies for diversifying Zanzibar's energy mix and fostering sustainable development.
Development of a microfluidic paper based with portable system for glucose concentration colorimetric analysis Irwansyah, Ridho; Herdian, Muhammad Bintang; Whulanza, Yudan
Prosiding SNTTM Vol 23 No 1 (2025): SNTTM XXIII October 2025
Publisher : BKS-TM Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.71452/2eqhby13

Abstract

Diabetes mellitus is a major health problem in Indonesia, with a prevalence of up to 20.4 million people in 2024 according to the International Diabetes Federation (IDF). Early detection of blood sugar is hampered by expensive and difficult-to-access diagnostic tools. Microfluidic paper-based analytical devices (μPADs) are a potential solution because they are inexpensive, portable, and environmentally friendly, in accordance with WHO ASSURED standards. This study aims to develop a μPAD integrated with a portable detection system for colorimetric quantification of glucose concentration using Glucose Oxidase–Peroxidase Aminoantipyrine (GOD-PAP) reagent, which produces a color change proportional to glucose concentration. Initial testing was conducted on phosphate-buffered saline (PBS) and D-glucose solutions as test materials in glucose concentration research. The test materials will be validated using spectrophotometry. Next, the test materials will be applied to μPAD for colorimetric observation using an RGB sensor on a portable device. The quantification results show that the red ratio at 10 minutes of the colorimetric method has excellent linearity (R² = 0.96). Precision validation of the colorimetric method produced an RSD value of less than 5%. The paired t-test produced a p-value of 0.42 with a 95% confidence level, indicating that there was no significant difference between the glucose concentration quantification results obtained using the colorimetric method and the spectrophotometric method.
Pengembangan gear dengan proses additive manufacturing berbasis lattice structure dengan dimensi variasional Indriyana, Vynna Alviolina; Kiswanto, Gandjar; Irwansyah, Ridho
Prosiding SNTTM Vol 23 No 1 (2025): SNTTM XXIII October 2025
Publisher : BKS-TM Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.71452/rpb15d50

Abstract

Gears are fundamental components in mechanical systems, where reducing weight without compromising strength is a key engineering challenge. This study introduces a multi-material gear with a lattice structure fabricated by Additive Manufacturing (AM). The design integrates an outer gear of Ti-6Al-4V for high strength and wear resistance with an inner gear of 316L stainless steel for structural support. Weight reduction was achieved by generating a diamond wire cube lattice with variable strut diameters, optimized using stress distribution data from finite element analysis and clustering with the K-means algorithm. Structural analysis through ANSYS Explicit Dynamics and fatigue simulations confirmed that stresses remained below the ultimate tensile strength of both materials, ensuring reliable service life. Thermal analysis with CFD indicated a maximum operating temperature of 64.1 °C, within the typical gear range of 50–140 °C. The proposed design reduces gear mass by 34.8% compared to a solid model, demonstrating the feasibility of multi-material AM with lattice optimization for lightweight and durable gear applications. 
Tahapan Dalam Desain Konseptual Mobil terbang Bersayap Tetap Adhitya, Mohammad; Irwansyah, Ridho
Prosiding SNTTM Vol 23 No 1 (2025): SNTTM XXIII October 2025
Publisher : BKS-TM Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.71452/y76aae85

Abstract

Mobil terbang adalah suatu wahana yang harus mampu beroperasi di jalan raya selayaknya mobil yang kita ketahui secara umum yang wajib memenuhi regulasi mobil raya meliputi dimensi dan hal-hal lain untuk memastikan keselamatan di jalan raya. Mobil terbang di sisi lain saat berfungsi sebagai pesawat terbang relatif tidak dibatasi dalam hal dimensi namun kinerjanya sangat dipengaruhi oleh aspek aerodinamika yang sangat dipengaruhi oleh perbandingan gaya angkat terhadap gaya berat pesawat (lift to weight ratio). Meskipun dinamakan sebagai mobil terbang, namun dari segi teknis dan tahapan desainnya, wahana ini lebih merupakan suatu pesawat terbang yang didesain sedemikian rupa agar dimensi serta sistem roda penopangnya dapat memenuhi fungsi dan regulasi dari suatu mobil. Dalam tulisan ini disampaikan suatu tahapan terstruktur dalam mendesain suatu mobil terbang yang merupakan kombinasi dari parameter-parameter penting suatu desain mobil dan pesawat terbang yang terdiri dari 8 tahapan yaitu 1. Requirements, 2. Weight estimation, 3. Critical performance parameters, 4. Configuration layout, 5. Force analysis due to CG position, 6. Better weight estimation, 7. Performance analysis, dan 8. Optimization. Hasil dari tahapan ini tentunya berupa desain mobil terbang yang dapat memenuhi fungsinya sebagai mobil yang memenuhi regulasi jalan raya dan sebagai pesawat terbang.
Co-Authors Amelia, Almira Citra Ary Maulana Budiarso Budiman, Arif Adtyas Dwi Yuliaji Gerry Julian Hamza Khamis Kombo Herdian, Muhammad Bintang Indriyana, Vynna Alviolina Kombo, Hamza Khamis Maryadi, Shendy Akbar Mohammad Adhitya, Mohammad Muhamad Agil Fadhel Muhammad Faridz Athaya Muhammad Mizan Mulya Juarsa Nandy Putra Nasruddin Nasruddin Nasruddin Nasruddin Pamitran, Agus Sunjarianto PAMUNGKAS, ADHIKA ENGGAR Putut Hery Setiawan Warjito Wayan Nata Septiadi Yudan Whulanza