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Arirohman, Ilham Dwi
Institut Teknologi Sumatera
Arts Humanities Automotive Engineering Chemical Engineering, Chemistry & Bioengineering Chemistry Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Earth & Planetary Sciences Economics, Econometrics & Finance Education Electrical & Electronics Engineering Energy Engineering Industrial & Manufacturing Engineering Law, Crime, Criminology & Criminal Justice Materials Science & Nanotechnology Mechanical Engineering Nursing Public Health Other

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Twist and chord optimization using the linearization method on the taper blade of a micro-horizontal axis wind turbineTwist and chord optimization using the linearization method on the taper blade of a micro-horizontal axis wind turbine Syaukani, Muhammad; Aryadi, Anugrah Wahyu; Arirohman, Ilham Dwi; Sofyan, Sarwo Edhy; Bahar, Aditiya Harjon; Sabar, Sabar
Jurnal Polimesin Vol 22, No 5 (2024): October
Publisher : Politeknik Negeri Lhokseumawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30811/jpl.v22i5.5540

Abstract

The research aims to optimize the geometry of taper blade profiles for the Horizontal Axis Wind Turbine (HAWT) to improve aerodynamic performance and minimize fabrication complexity. The study used blade linearization as an optimization method for identifying a desirable twist (β) and chord (Cr). This approach enhances accuracy and boosts computational efficiency. It simplifies the optimization process by reducing complexity. In contrast, traditional nonlinear methods are slower and more resource-intensive due to complex aerodynamic interactions. The best β and Cr distributions were found by linearization with elements 1 and 10 of the blade length and positions 5%, 15%, 25%, 35%, 45%, 55%, 65%, 75%, 85, and 95% of the blade elements. The linearization results were used to determine the optimum performance of the HAWT design using simulation. The optimal blades for HAWT were fabricated and their performance evaluated under real wind conditions. The linearization of the 45% twist and chord of elements 1 and 10 provided the best blade shape. Optimized twist and chord yielded HAWT performance with the Cp of 45% to 47% at rotational speeds of 200–900 rpm and wind speeds of 2–10 m/s. Twist and chord optimization increased the Cp from 39.71% to 46.43% with a rotational speed of 550 rpm at a wind speed of 6 m/s, as well as the maximum mechanical power from 424.28 watts to 500.35 watts at a wind speed of 10 m/s. The result from real wind conditions showed that manufactured HWAT produced an average electrical power of 294.19 watts at a rotational speed of 590.66 rpm. These results demonstrate that the optimized design approach presents a close match and is still reasonable in comparison to practical conditions.
EFFECT OF BLEACHING EARTH ADDITION IN THE PRETREATMENT OF USED COOKING OIL ON BIODIESEL QUALITY Devy Arysandi; Ilham Dwi Arirohman; Muhammad Rizky Zen; Aji Suhartoyo
Scientific Journal of Mechanical Engineering Kinematika Vol 11 No 1 (2026): SJME Kinematika June 2026
Publisher : Mechanical Engineering Department, Faculty of Engineering, Universitas Lambung Mangkurat

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20527/sjmekinematika.v11i1.826

Abstract

Used cooking oil represents a promising alternative feedstock for biodiesel production due to its environmental benefits and economic feasibility. However, its direct utilization is limited by the high free fatty acid (FFA) content, which can interfere with the transesterification process. Therefore, a pretreatment process is required. This research investigates the effect of adding bleaching earth to the pretreatment process of used cooking oil (UCO) on the quality of the biodiesel produced. The research was conducted using a laboratory-scale experimental method with variations in the bleaching earth percentage from 0.5% to 2.0% (w/w). The findings indicate that bleaching earth significantly improves the quality of UCO as a biodiesel feedstock. Nevertheless, excessive addition of bleaching earth may lead to degradation effects and reduced stability of the biodiesel. Optimal performance, corresponding to compliance with SNI 7182:2015, was achieved with the addition of 1.0% bleaching earth. The resulting biodiesel had an acid number of 0.224 mg KOH/g, a density of 851.12 kg/m³, a viscosity of 4.44 cSt, a yield of 72.84% and a calorific value of 46.92 MJ/kg. Additionally, the physical quality, that is color of the biodiesel produced, is bright yellow.
Co-Authors Achmad Gus Fahmi Afit Miranto Aji Suhartoyo Akhmad Zidni Hudaya Alfian, Devia G. C Ammar, Naufal Apriansyah Julio Aryadi, Anugrah Wahyu Bahar, Aditiya Harjon Deendarlianto Devia Gahana Cindi Alfian Devy Arysandi Devy Arysandi Dwi Saputra, Agung Fahmi Sapta Hadi Fajar Paundra Fajar Paundra Fitrah Qalbina Gaol, Javeni Eysama L. Harahap, Al Barra Harmiansyah Hotdimas Simanjuntak I Indarto Ismail, Abdi Khoirun Naimah Kiki Yuli Handayani Lathifa Putri Afisna Madi Madi Maulana Wicaksono, Rihardian Muhammad Khanafi Muhammad Syaukani Muhammad, Ghaffar Muhyi, Abdul Naimah, Khoirun Pujiyulianto, Eko Purba, Leonardo D. Putty Yunesti Putty Yunesti Rahmat Ramadhan Wahab Rahmatullah, Abri Ridho Hilman, Muhammad Rihardian Maulana Wicaksono Rizky Zen, Muhammad Sabar Sabar Sadono, Fajar Sidik Shintha Sarmila A.S Yahya Siti Muslimah Soelami, F.X. Nugroho Sofyan, Sarwo Edhy Syah, Muhammad Aksel Tuswan Tuswan Wicaksono, Rihardian Maulana Yulianti Fatmawati Yunesti, Putty Zen, Muhammad Rizky