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All Journal Rekayasa Mesin Turbo : Jurnal Program Studi Teknik Mesin Jurnal AME (Aplikasi Mekanika dan Energi): Jurnal Ilmiah Teknik Mesin Jurnal Teknik Mesin Dharma Raflesia : Jurnal Ilmiah Pengembangan dan Penerapan IPTEKS IRA Jurnal Teknik Mesin dan Aplikasinya (IRAJTMA) TEKNOSIA Jurnal Polimesin Rekayasa Mekanika: Jurnal Ilmiah Teknik Mesin Dharmakayana: Journal of scientists, engineers, educators and scientific activists related to society development
Yovan Witanto
Program Studi Teknik Mesin, Fakultas Teknik, Universitas Bengkulu
Agriculture, Biological Sciences & Forestry Humanities Automotive Engineering Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Decision Sciences, Operations Research & Management Education Energy Engineering Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mechanical Engineering Social Sciences Transportation Other

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Experimental study on a laboratory-scale archimedes screw turbine using pitch-to-diameter ratio for low-head hydropower Helmizar Helmizar; Nurcholish Windiharto; Yovan Witanto; Afdhal Kurniawan Mainil; Rahmat Iman Mainil; Khotso Sai
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.v23i3.6690

Abstract

The Archimedes screw is a hydropower technology well-suited for low-head applications This study investigates the performance of a laboratory-scale Archimedes screw turbine for low-head hydropower applications by varying pitch-to-diameter ratio (P/D = 0.3, 0.38, 0.45, 0.52) and inclination angle (β = 22°, 25°, 27°). Experiments were conducted in a controlled water flow environment to evaluate torque, power output, and efficiency at different rotational speeds. Results indicate that both P/D and β significantly influence energy conversion. The highest performance was achieved at P/D = 0.45 and β = 22°, producing a peak torque of 0.36 Nm, a power output of 2.4 W, and a maximum efficiency of 52.37%. Lower inclination angles contributed to improved hydraulic energy capture due to better water filling and reduced slippage. These findings highlight the importance of optimizing geometric parameters to enhance turbine performance in small-scale, sustainable energy systems. The results offer design guidance for implementing Archimedes screw turbines in rural or off-grid low-head hydropower scenarios.
ANALISIS RESPON DAYA PEMANAS PADA FASILITAS HEATING CONTROL Prasetya Hariyanto, Kevin; Zuliantoni; Witanto, Yovan; Valentina, Pricylia
Rekayasa Mekanika: Jurnal Ilmiah Teknik Mesin Vol. 9 No. 2 (2025): Oktober 2025
Publisher : UNIB Press

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33369/rekayasamekanika.v9i2.40634

Abstract

Currently the Fassip-01 strand to Fassip-07 uses a control system of two positions (on-off) in controlling heaters to maintain stopping conditions when experiments are carried out. Nuclear Termofluidal System Research Group Develops the Heating Control Facility that functions as a Heating Control System Test Facility using PID system control (proportional integral derivative) to overcome the problem of existing residual heat due to the use of the Kend system This test was conducted to find out the analysis of 4 heater power before the experiment took place and analyzed RTM (Risetime) Setpoint 40.45, and 50 degrees. In this experiment the method used was an experiment so that the results were obtained in the form of accuracy values, heater positions, high energy consumption, poor power settings, large residual heat and time difference ratio in each setpoint.
Pelatihan Budidaya Cabai Polibag untuk Pemberdayaan dan Ketahanan Pangan di Pematang Gubernur Supardi, Nurul Iman; Amri, Khairul; Witanto, Yovan; Zuliantoni, Zuliantoni
Dharmakayana Vol 2 No 2 (2025): November : Dharmakayana: Journal of scientists, engineers, educators and scientif
Publisher : Program Studi Teknik Mesin, Fakultas Teknik Universitas Bengkulu

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33369/dk.v2i2.45791

Abstract

This community service activity aims to improve community food security through the implementation of chili cultivation in polybags in Pematang Gubernur Village, Muara Bangkahulu District, Bengkulu City. The main problems faced by the community at the partner location are limited yard space and high chili prices during certain seasons. Through chili cultivation training in polybags, the community is equipped with knowledge and practical skills ranging from preparing the planting medium, sowing seeds, planting, maintenance, and harvesting. Implementation methods include counseling, live demonstrations, and field assistance. The results of the activity show an increase in community knowledge and motivation in utilizing limited land to grow chili independently. Thus, this activity contributes to supporting household food security and community economic empowerment.
ANALISIS KONSUMSI BAHAN BAKAR SPESIFIK PADA KONDISI PEMBEBANAN MAKSIMAL Amanda, Rezza; Witanto, Yovan; Alqap, A. Sofwan F
Rekayasa Mekanika: Jurnal Ilmiah Teknik Mesin Vol. 10 No. 1 (2026): April 2026
Publisher : UNIB Press

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33369/rekayasamekanika.v10i1.46229

Abstract

The operational performance of a Gas and Steam Power Plant (PLTGU) is largely determined by its cycle thermal efficiency. Specific fuel consumption (SFC) is a key metric that represents the ratio of total fuel consumption to generated electrical power. This study aims to analyze the SFC value and its tendency towards maximum load. The method used is quantitative by processing steady-state operational data from the central control room (CCR). Data were taken under operating conditions with natural gas fuel and maximum load. The calculation results show a very narrow and stable variation in SFC values, ranging from the lowest to 0.30769 kg/kWh at a load of 19.88 MW to the highest at 0.30967 kg/kWh at a load of 20.01 MW. Theoretically, efficiency (indicated by a decrease in SFC) should increase with increasing load. The anomalous increase in SFC at 20.01 MW at 10:00 a.m. Western Indonesian Time (WIB) is interpreted as a result of the fuel injection system's rapid response to the sudden increase in load, or the engine operating slightly outside its design efficiency range at that point. Nevertheless, the overall trend shows stable efficiency, with a tendency for SFC to decrease with increasing load, indicating the unit is capable of maintaining optimal performance under peak load conditions.
Pengaruh Variasi Kemiringan Front Wall Dan Perioda Gelombang Air Laut Terhadap Daya Udara Yang Dihasilkan Dan Efisiensi Pada Model Oscillating Water Column (Owc) Pembangkit Tenaga Gelombang Alif Rahman Peldiansah Ismael; Nurul Iman Supardi; Angky Puspawan; Yovan Witanto; ASF Alqap
IRA Jurnal Teknik Mesin dan Aplikasinya (IRAJTMA) Vol 5 No 1 (2026): April
Publisher : CV. IRA PUBLISHING

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.56862/irajtma.v5i1.391

Abstract

Ocean wave energy is a renewable resource with significant potential for development in Indonesia, given its vast coastal areas. One technology for converting wave energy into usable power is the Oscillating Water Column (OWC) system. This system utilizes the vertical motion of seawater inside a chamber to generate airflow, which then drives a turbine to produce energy. This study aims to analyze the effect of oscillating column tilt angle and wave period variations on the energy conversion efficiency of an OWC model, and to determine the optimal tilt angle for maximum efficiency in converting wave power into air power. The research was conducted experimentally using a laboratory-scale OWC model measuring 1500 mm in length, 300 mm in width, and 500 mm in height. The oscillating column tilt angles tested were 0°, 35°, 40°, and 45°. Artificial waves were generated using a motor drive at 30 rpm, 40 rpm, and 50 rpm, producing wave periods of 2.1 seconds, 1.6 seconds, and 1.2 seconds, respectively. Measured parameters included air velocity, motor speed, wave period, wavelength, and wave height. Calculations determined wave power, air power, and system efficiency. Results show tilt angle and wave period significantly affect OWC efficiency, with the highest efficiency reaching 41.00% at 40° tilt and 1.6-second waves.
Co-Authors Adhadi Kurniawan Afdhal Kurniawan Mainil Afif Chaniago Bastiar Agus Nuramal Agus Suandi Agus Suandi, Agus Alif Rahman Peldiansah Ismael Alqap, A. Sofwan F Amanda, Rezza Angky Puspawan Anizar Indriani Anizar Indriani Anizar Indriani Anizar Indriani Aritonang, Jefri Fanto ASF Alqap Benny Dwika Leonanda Bismantolo, Putra Budiman, Arif Adtyas Dedi Suryadi Eng Hendra Erwinsyah, Mochamad Dava Erwinsyah Helmizar Helmizar - Hendra Hendra Hendra Hendra Hendra Hendra Hendra Hendra Hendri van Hoten Hutapea, Gumarang ISMAEL , ALIF RAHMAN PELDIANSYAH Johan Johan Khairul Amri Khotso Sai Nopriani, Meti Eliza Nurbaiti Nurbaiti Nurbaiti Nurcholish Windiharto Nurul Iman Supardi Nurul Iman Supardi Prasetya Hariyanto, Kevin Pratama, Samuel Yoga Putra, Shandy Tri Rahmat Iman Mainil ricky, 240103 Rifki Sulthan Rosa, Khairul Amri Rosa, M. Khairul Amri Solly Aryza Syabanda, Yukhi Mustaqim Kusuma Triyansah, Olga Valentina, Pricylia Zuliantoni, Zuliantoni